AndroidStudio——今日頭條（可以實時獲取數據的app）

今日頭條包含以下模塊：

首頁 視頻 天氣 和 我的

其中 首頁用於加載實時的新聞頻道及內容，可以實現點擊圖片查看圖片詳情，並且可以實現內容的收藏與取消收藏

視頻模塊暫時未加入任何內容

天氣模塊可以實現天氣的實時更新，最多可以顯示最近三天的天氣情況

我的 模塊中 點擊收藏，可以查看收藏的新聞內容

              **Activity代碼：**

MainActivity

public class MainActivity extends AppCompatActivity {
    private FragmentTabHost ft;
    private String[] str = {"首頁", "視頻", "天氣", "我的"};
    private int[] imgRes = {R.drawable.home, R.drawable.video, R.drawable.topic,
            R.drawable.my};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ft = (FragmentTabHost) findViewById(R.id.ft);
        getSupportActionBar().hide();
        init();
    }

    public void init() {
        //裝配
        ft.setup(this, getSupportFragmentManager(), R.id.fl);
        Fragment home = new HomeFragment();
        //TabSpec標簽說明
        TabHost.TabSpec tabSpec0 =
                ft.newTabSpec(str[0]).setIndicator(getView(0));
        ft.addTab(tabSpec0, home.getClass(), null);
        Fragment video = new VideoFragment();
        TabHost.TabSpec tabSpec1 =
                ft.newTabSpec(str[1]).setIndicator(getView(1));
        ft.addTab(tabSpec1, video.getClass(), null);
        Fragment topic = new TopicFragment();
        TabHost.TabSpec tabSpec2 =
                ft.newTabSpec(str[2]).setIndicator(getView(2));
        ft.addTab(tabSpec2, topic.getClass(), null);
        Fragment my = new MyFragment();
        TabHost.TabSpec tabSpec3 =
                ft.newTabSpec(str[3]).setIndicator(getView(3));
        ft.addTab(tabSpec3, my.getClass(), null);
    }

    public View getView(int i) {
        View v = getLayoutInflater().inflate(R.layout.tab_layout, null);
        ImageView iv = (ImageView) v.findViewById(R.id.iv);
        TextView tv = (TextView) v.findViewById(R.id.tv);
        iv.setImageResource(imgRes[i]);
        tv.setText(str[i]);
        return v;
    }
}

ContentActivity

public class ContentActivity extends AppCompatActivity {
private WebView wv;
private ImageView back;
private TextView title, collection;
private boolean isExisits;
private NewsDao newsDao;
private String titles;
//全局變量自動賦值 局部變量不可以
private MyNews news;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_content);
    getSupportActionBar().hide();
    wv = (WebView) findViewById(R.id.wv);
    back = (ImageView) findViewById(R.id.back);
    title = (TextView) findViewById(R.id.title);
    collection = (TextView) findViewById(R.id.collection);
    //getIntent()是將該項目中包含的原始intent檢索出來
    //將檢索出來的intent賦值給一個Intent類型的變量intent
    Intent intent = getIntent();
    String html = "";
    titles = "";
    if (intent != null) {
        news = intent.getParcelableExtra("news");
        html = news.getHtml();
        titles = news.getTitle();
    }
    title.setText(titles);
    WebSettings ws = wv.getSettings();
    //支持放大
    ws.setSupportZoom(true);
    //顯示放大縮小的控件  一個加號一個減號
    ws.setDisplayZoomControls(true);
    ws.setJavaScriptEnabled(true);
    ws.setDefaultTextEncodingName("utf-8");
    //放大多少倍
    //ws.setTextZoom(20);
    wv.loadDataWithBaseURL("", html, "text/html", "utf-8", "");
    //設置內容的背景顏色
    wv.setBackgroundColor(getResources().getColor(R.color.background));
    newsDao = new NewsDao(this);
    //判斷新聞是否收藏過
    checkNews(titles);
    back.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            finish();
        }
    });

    collection.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if(isExisits){
                newsDao.deleteNews(news.getTitle());
                collection.setText("取消收藏");
            }else {
                newsDao.addNews(news);
                collection.setText("收藏");
            }
            checkNews(news.getTitle());
        }
    });
}

public void checkNews(String title) {
    MyNews myNews = newsDao.searchNews(title);
    // MyNews myNews = new MyNews();
    if (myNews == null) {
        collection.setText("收藏");
        isExisits = false;
    } else {
        collection.setText("取消收藏");
        isExisits = true;
    }
}

}

ImgActivity

public class ImgActivity extends AppCompatActivity {
    private PhotoViewPager pvp;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_img);
        getSupportActionBar().hide();
        pvp = (PhotoViewPager) findViewById(R.id.pvp);
        Intent intent = getIntent();
        String imgUrls = intent.getStringExtra("img");
        List pvList = new ArrayList<>();
        List imgList = paserImageList(imgUrls);
        for (int i = 0; i < imgList.size(); i++) {
            PhotoView pv = new PhotoView(this);
            pv.setScaleType(ImageView.ScaleType.CENTER_CROP);
            Glide.with(this).load(imgList.get(i)).into(pv);
            pvList.add(pv);
        }
        pvp.setAdapter(new MyViewPagerAdapter(pvList));
    }

    public List paserImageList(String imgList) {
        List img = new ArrayList();
        try {
            JSONArray ja = new JSONArray(imgList);
            for (int i = 0; i < ja.length(); i++) {
                JSONObject obj = (JSONObject) ja.get(i);
                if (obj.has("url")) {
                    img.add(obj.getString("url"));
                }
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return img;
    }

    public class MyViewPagerAdapter extends PagerAdapter {
        private List myData;

        public MyViewPagerAdapter(List myData) {
            this.myData = myData;
        }

        @Override
        public int getCount() {
            return myData.size();
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == object;
        }

        //自己寫的
        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            container.addView(myData.get(position));
            return myData.get(position);
        }

        //自己寫的
        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            container.removeView(myData.get(position));
        }
    }
}

CollectionActivity

public class CollectionActivity extends AppCompatActivity {
    private ListView lv;
    private List list;
    private NewsDao newsDao;
    private NewsBaseAdapter na;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_collection);
        lv = (ListView) findViewById(R.id.lv);
        list = new ArrayList<>();
        na = new NewsBaseAdapter(list, this);
        lv.setAdapter(na);
        newsDao = new NewsDao(this);
        getList();
    }

    public void getList() {
        //先清空  避免疊加
        list.clear();
        //list=List不可用  由於不能觸發na.notifyDataSetChanged();所以導致布局加載不出數據來
        list.addAll(newsDao.searchNews());
        na.notifyDataSetChanged();
    }

    @Override
    protected void onStart() {
        super.onStart();
        getList();
    }
}

                   **adapter 代碼**

MyTabHostAdapter

public class MyTabHostAdapter extends FragmentPagerAdapter {
    private List list;

    public MyTabHostAdapter(FragmentManager fm, List list) {
        super(fm);
        this.list = list;
    }

    @Override
    public Fragment getItem(int position) {
        return list.get(position);
    }

    @Override
    public int getCount() {
        return list.size();
    }
}

NewsBaseAdapter

public class NewsBaseAdapter extends BaseAdapter {
    private List myNews;
    private Context context;
    //常量必須從0開始  並且不能跳著來不能0,2,4...
    private final int TYPE0 = 0;
    private final int TYPE1 = 1;
    private final int TYPE2 = 2;
    private final int TYPE3 = 3;

    public NewsBaseAdapter(List myNews, Context context) {
        this.myNews = myNews;
        this.context = context;
    }


    @Override
    public int getCount() {
        return myNews.size();
    }

    @Override
    public Object getItem(int position) {
        return myNews.get(position);
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        final ViewHolder vh;
        int type = getItemViewType(position);
        if (convertView == null) {
            vh = new ViewHolder();
            if (type == 3) {
                convertView = LayoutInflater.from(context).inflate(R.layout.my_news_layout3, null);
                vh.title = (TextView) convertView.findViewById(R.id.title);
                vh.pubDate = (TextView) convertView.findViewById(R.id.pubDate);
                vh.source = (TextView) convertView.findViewById(R.id.source);
                vh.img = (ImageView) convertView.findViewById(R.id.img);
                vh.img2 = (ImageView) convertView.findViewById(R.id.img2);
                vh.img3 = (ImageView) convertView.findViewById(R.id.img3);
                vh.img.setOnClickListener(new ClickLisner(position));
                vh.img2.setOnClickListener(new ClickLisner(position));
                vh.img3.setOnClickListener(new ClickLisner(position));
                convertView.setTag(vh);
            } else if (type == 2) {
                convertView = LayoutInflater.from(context).inflate(R.layout.my_news_layout2, null);
                vh.title = (TextView) convertView.findViewById(R.id.title);
                vh.pubDate = (TextView) convertView.findViewById(R.id.pubDate);
                vh.source = (TextView) convertView.findViewById(R.id.source);
                vh.img = (ImageView) convertView.findViewById(R.id.img);
                vh.img2 = (ImageView) convertView.findViewById(R.id.img2);
                vh.img.setOnClickListener(new ClickLisner(position));
                vh.img2.setOnClickListener(new ClickLisner(position));
                convertView.setTag(vh);
            } else if (type == 1) {
                convertView = LayoutInflater.from(context).inflate(R.layout.my_news_layout1, null);
                vh.title = (TextView) convertView.findViewById(R.id.title);
                vh.pubDate = (TextView) convertView.findViewById(R.id.pubDate);
                vh.source = (TextView) convertView.findViewById(R.id.source);
                vh.img = (ImageView) convertView.findViewById(R.id.img);
                vh.img.setOnClickListener(new ClickLisner(position));
                convertView.setTag(vh);
            } else {
                convertView = LayoutInflater.from(context).inflate(R.layout.my_news_layout, null);
                vh.title = (TextView) convertView.findViewById(R.id.title);
                vh.pubDate = (TextView) convertView.findViewById(R.id.pubDate);
                vh.source = (TextView) convertView.findViewById(R.id.source);
                convertView.setTag(vh);
            }
        } else {
            vh = (ViewHolder) convertView.getTag();
        }
        //通過這一句知道要加載哪個頻道的news
        MyNews news = myNews.get(position);
        if (type == 3) {
            vh.title.setText(news.getTitle());
            vh.source.setText(news.getSource());
            vh.pubDate.setText(news.getPubDate());
            List list = paserImageList(news.getImageurls());
            if (list.size() == 3) {
                Glide.with(context).load(list.get(0)).into(vh.img);
                Glide.with(context).load(list.get(1)).into(vh.img2);
                Glide.with(context).load(list.get(2)).into(vh.img3);
            }
        } else if (type == 2) {
            vh.title.setText(news.getTitle());
            vh.source.setText(news.getSource());
            vh.pubDate.setText(news.getPubDate());
            List list = paserImageList(news.getImageurls());
            if (list.size() == 2) {
                Glide.with(context).load(list.get(0)).into(vh.img);
                Glide.with(context).load(list.get(1)).into(vh.img2);
            }
        } else if (type == 1) {
            vh.title.setText(news.getTitle());
            vh.source.setText(news.getSource());
            vh.pubDate.setText(news.getPubDate());
            List list = paserImageList(news.getImageurls());
            if (list.size() == 1) {
                Glide.with(context).load(list.get(0)).into(vh.img);
            }
        } else {
            vh.title.setText(news.getTitle());
            vh.source.setText(news.getSource());
            vh.pubDate.setText(news.getPubDate());
        }
        convertView.setOnClickListener(new ClickLisner(position));
        return convertView;
    }

    public class ClickLisner implements View.OnClickListener {
        private int position;
        //在類裡生成構造 把position傳進來
        public ClickLisner(int position) {
            this.position = position;
        }

        @Override
        public void onClick(View v) {
            int id=v.getId();
            if(id==R.id.img||id==R.id.img2||id==R.id.img3){
                Intent intent=new Intent(context, ImgActivity.class);
                intent.putExtra("img",myNews.get(position).getImageurls());
                context.startActivity(intent);
            }else{
                MyNews news = myNews.get(position);
                // Log.d("======", news.getHtml());
                Intent intent = new Intent(context, ContentActivity.class);
                //MyNews要實現序列化
                intent.putExtra("news", news);
                context.startActivity(intent);
            }
        }
    }

    public class ViewHolder {
        TextView pubDate;
        TextView title;
        ImageView img;
        TextView source;
        ImageView img2;
        ImageView img3;
    }

    @Override
    public int getItemViewType(int position) {
        List list = paserImageList(myNews.get(position).getImageurls());
        if (list.size() == 3) {
            return TYPE3;
        } else if (list.size() == 1) {
            return TYPE1;
        } else if (list.size() == 2) {
            return TYPE2;
        } else {
            return TYPE0;
        }
    }

    @Override
    public int getViewTypeCount() {
        return 4;
    }

    public List paserImageList(String imgList) {
        List img = new ArrayList();
        try {
            JSONArray ja = new JSONArray(imgList);
            for (int i = 0; i < imgList.length(); i++) {
                JSONObject obj = (JSONObject) ja.get(i);
                if (obj.has("url")) {
                    img.add(obj.getString("url"));
                }
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return img;
    }

}

NewsFragmentAdapter

public class NewsFragmentAdapter extends FragmentPagerAdapter {
    private List fragmentList;
    private List titles;

    public NewsFragmentAdapter(FragmentManager fm, List fragmentList, List titles) {
        //public NewsFragmentAdapter(List fm,FragmentActivity fragmentList) {
        super(fm);
        this.fragmentList = fragmentList;
        this.titles = titles;
    }

    @Override
    public Fragment getItem(int position) {
        return fragmentList.get(position);
    }

    @Override
    public int getCount() {
        return fragmentList.size();
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return titles.get(position);
    }
}

                             **dao文件**

NewsDao

public class NewsDao {
    private MyDbHelper myDbHelper;

    public NewsDao(Context context) {
        myDbHelper = new MyDbHelper(context);
    }

    //收藏新聞
    public void addNews(MyNews myNews) {
        SQLiteDatabase db = myDbHelper.getWritableDatabase();
        ContentValues cv = new ContentValues();
        cv.put("title", myNews.getTitle());
        cv.put("pubDate", myNews.getPubDate());
        cv.put("source", myNews.getSource());
        cv.put("html", myNews.getHtml());
        cv.put("imageurls", myNews.getImageurls());
        db.insert("news", null, cv);
        db.close();

    }

    //查詢所有收藏
    public List searchNews() {
        SQLiteDatabase db = myDbHelper.getReadableDatabase();
        Cursor cs = db.query("news", null, null, null, null, null, null);
        MyNews myNews = null;
        List list = new ArrayList<>();
        while (cs.moveToNext()) {
            myNews = new MyNews();
            // cs.getColumnIndex("_id")   id 這一列結果中的下標
            myNews.setTitle(cs.getString(cs.getColumnIndex("title")));
            myNews.setSource(cs.getString(cs.getColumnIndex("source")));
            myNews.setPubDate(cs.getString(cs.getColumnIndex("pubDate")));
            myNews.setHtml(cs.getString(cs.getColumnIndex("html")));
            myNews.setImageurls(cs.getString(cs.getColumnIndex("imageurls")));
            list.add(myNews);
        }
        cs.close();
        db.close();
        return list;

    }

    //查詢一條收藏
    public MyNews searchNews(String title) {
        SQLiteDatabase db = myDbHelper.getWritableDatabase();
        Cursor cs = db.query("news", null, "title = ? ", new String[]{title}, null, null, null);
        MyNews myNews = null;
        if (cs.moveToNext()) {
            myNews = new MyNews();
            // cs.getColumnIndex("_id")   id 這一列結果中的下標
            myNews.setTitle(cs.getString(cs.getColumnIndex("title")));
            myNews.setSource(cs.getString(cs.getColumnIndex("source")));
            myNews.setPubDate(cs.getString(cs.getColumnIndex("pubDate")));
            myNews.setHtml(cs.getString(cs.getColumnIndex("html")));
            myNews.setImageurls(cs.getString(cs.getColumnIndex("imageurls")));
        }
        cs.close();
        db.close();
        return myNews;
    }

    // 取消收藏
    public void deleteNews(String title) {
        SQLiteDatabase db = myDbHelper.getWritableDatabase();
        db.delete("news", "title= ? ", new String[]{title});
        db.close();
    }

}

NewsCacheDao

public class NewsCacheDao {
    private Context context;
    private Dao newsDao;
    private DatabaseHelper helper;

    public NewsCacheDao(Context context) {
        this.context = context;
        helper = (DatabaseHelper) DatabaseHelper.getHelper(context);
        try {
            newsDao = helper.getDao(MyNews.class);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    public void addNews(MyNews news) {
        try {
            //根據主鍵來判斷是更新還是修改  因此一定要有主鍵
            newsDao.createOrUpdate(news);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    //根據id查找新聞
    public ArrayList searchNews(String chId) {
        try {
            return (ArrayList) newsDao.queryBuilder().where().eq("channelId", chId).query();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }
}

WeatherCacheDao

public class WeatherCacheDao {
    private Context context;
    private Dao weatherDao;
    private DatabaseHelper helper;

    public WeatherCacheDao(Context context) {
        this.context = context;
        helper = (DatabaseHelper) DatabaseHelper.getHelper(context);
        try {
            weatherDao = helper.getDao(Weather.class);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    public void addWeather(Weather weather) {
        try {
            //根據主鍵來判斷是更新還是修改  因此一定要有主鍵
            weatherDao.createOrUpdate(weather);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    //查詢所有
    public List searchWeather() {
        try {
            return weatherDao.queryForAll();
        } catch (SQLException e) {
            e.printStackTrace();
        }return null;
    }
    public  void deleteAll(){
        try {
            weatherDao.deleteBuilder().delete();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

                     **dataBaseHelper文件**

DatabaseHelper

public  class DatabaseHelper extends OrmLiteSqliteOpenHelper {
    private static final String TABLE_NAME = "ormtest.db";
    private Map daos = new HashMap();
    private static DatabaseHelper instance;
    private DatabaseHelper(Context context) {
        super(context, TABLE_NAME, null, 2);
    }
    @Override  
    public void onCreate(SQLiteDatabase database,  
            ConnectionSource connectionSource) {
        try {
            TableUtils.createTable(connectionSource, MyNews.class);
            TableUtils.createTable(connectionSource, Weather.class);
        } catch (SQLException e) {
            e.printStackTrace();  
        }  
    }
    @Override  
    public void onUpgrade(SQLiteDatabase database,  
            ConnectionSource connectionSource, int oldVersion, int newVersion) {
        try {
            //匹配User.class類
            TableUtils.dropTable(connectionSource, MyNews.class, true);
            TableUtils.dropTable(connectionSource, Weather.class, true);
            onCreate(database, connectionSource);
        } catch (SQLException e) {
            e.printStackTrace();  
        }  
    }
    /** 
     * 單例獲取該Helper 
     *  
     * @param context 
     * @return 
     */  
    public static synchronized DatabaseHelper getHelper(Context context) {
        context = context.getApplicationContext();  
        if (instance == null) {
            synchronized (DatabaseHelper.class) {
                if (instance == null)  {
                    instance = new DatabaseHelper(context);
                }
            }  
        }
        return instance;  
    }
    public synchronized Dao getDao(Class clazz) throws SQLException {
        Dao dao = null;
        String className = clazz.getSimpleName();
        if (daos.containsKey(className)) {
            dao = daos.get(className);  
        }  
        if (dao == null) {
            dao = super.getDao(clazz);  
            daos.put(className, dao);  
        }  
        return dao;  
    }
    /** 
     * 釋放資源 
     */  
    @Override  
    public void close() {
        super.close();
        for (String key : daos.keySet()) {
            Dao dao = daos.get(key);
            dao = null;  
        }  
    }
}  

MyDbHelper

public class MyDbHelper extends SQLiteOpenHelper {
    private final String DBNAME = "MyNews.db";
    private final String TABLE_NAME = "news";
    //在SQLite裡用作特殊標識的要加下劃線(主鍵)
    private final String INFO_COLUM_ID = "nid";
    private final String INFO_COLUM_TITLE = "title";
    private final String INFO_COLUM_HTML = "html";
    private final String INFO_COLUM_PUBDATE = "pubDate";
    private final String INFO_COLUM_SOURCE = "source";
    private final String INFO_COLUM_IMG = "imageurls";

    public MyDbHelper(Context context) {
        //版本號不能為0
        super(context, "MyNews.db", null, 1);
    }

    public MyDbHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) {
        super(context, name, factory, version);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        //如果沒有數據庫及數據表 就會在OnCreate裡自動創建
        StringBuilder sql = new StringBuilder();
        sql.append("Create table if not exists ");
        sql.append(TABLE_NAME + " ( ");
        // autoincrement 這一行自動增長
        //sql.append(INFO_COLUM_ID + " varchar(50) primary key ,");
        sql.append(INFO_COLUM_TITLE + " varchar(100)  primary key ,");
        sql.append(INFO_COLUM_HTML + " varchar(5000),");
        sql.append(INFO_COLUM_PUBDATE + " varchar(20),");
        sql.append(INFO_COLUM_SOURCE + " varchar(20),");
        sql.append(INFO_COLUM_IMG + " varchar(500)");
        sql.append(" ) ");
        //執行SQL
        db.execSQL(sql.toString());
    }

    //數據庫更新升級
    // 通過版本號Version 刪除以前的表  然後重新調用OnCreate
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        //刪除表（delete是刪除表裡的數據）
        String sql = " drop table if exists " + TABLE_NAME;
        db.execSQL(sql);
        onCreate(db);
    }
}

                          **entity文件**

MyNews

@DatabaseTable(tableName = "newsCache")
public class MyNews implements Parcelable{
    @DatabaseField
    private String pubDate;
    @DatabaseField(id=true)
    private String title;
    private String channelName;
    private String desc;
    @DatabaseField
    private String source;
    @DatabaseField
    private String channelId;
    private String link;
    @DatabaseField
    private String html;
    private List allList;
    @DatabaseField
    private String imageurls;
    private  String nid;

    public MyNews() {
    }

    protected MyNews(Parcel in) {
        pubDate = in.readString();
        title = in.readString();
        channelName = in.readString();
        desc = in.readString();
        source = in.readString();
        channelId = in.readString();
        link = in.readString();
        html = in.readString();
        allList = in.createStringArrayList();
        imageurls = in.readString();
        nid = in.readString();
    }

    public static final Creator CREATOR = new Creator() {
        @Override
        public MyNews createFromParcel(Parcel in) {
            return new MyNews(in);
        }

        @Override
        public MyNews[] newArray(int size) {
            return new MyNews[size];
        }
    };

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(pubDate);
        dest.writeString(title);
        dest.writeString(channelName);
        dest.writeString(desc);
        dest.writeString(source);
        dest.writeString(channelId);
        dest.writeString(link);
        dest.writeString(html);
        dest.writeStringList(allList);
        dest.writeString(imageurls);
        dest.writeString(nid);
    }

    public String getPubDate() {
        return pubDate;
    }

    public String getTitle() {
        return title;
    }

    public String getChannelName() {
        return channelName;
    }

    public String getDesc() {
        return desc;
    }

    public String getSource() {
        return source;
    }

    public String getChannelId() {
        return channelId;
    }

    public String getLink() {
        return link;
    }

    public String getHtml() {
        return html;
    }

    public List getAllList() {
        return allList;
    }

    public String getImageurls() {
        return imageurls;
    }

    public String getNid() {
        return nid;
    }

    public static Creator getCREATOR() {
        return CREATOR;
    }

    public void setPubDate(String pubDate) {
        this.pubDate = pubDate;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public void setChannelName(String channelName) {
        this.channelName = channelName;
    }

    public void setDesc(String desc) {
        this.desc = desc;
    }

    public void setSource(String source) {
        this.source = source;
    }

    public void setChannelId(String channelId) {
        this.channelId = channelId;
    }

    public void setLink(String link) {
        this.link = link;
    }

    public void setHtml(String html) {
        this.html = html;
    }

    public void setAllList(List allList) {
        this.allList = allList;
    }

    public void setImageurls(String imageurls) {
        this.imageurls = imageurls;
    }

    public void setNid(String nid) {
        this.nid = nid;
    }
}

Weather

@DatabaseTable
public class Weather implements Parcelable{
    @DatabaseField(id=true)
    private String date;                          //日期
    @DatabaseField
    private String text_day;                     //白天天氣現象文字
    @DatabaseField
    private String code_day;                     //白天天氣現象代碼
    @DatabaseField
    private String text_night;                   //晚間天氣現象文字
    @DatabaseField
    private String code_night;                  //晚間天氣現象代碼
    private String high;                         //當天最高溫度
    private String low;                          //當天最低溫度
    private String precip;                       //降水概率，范圍0~100，單位百分比
    private String wind_direction;              //風向文字
    private String wind_direction_degree;      //風向角度，范圍0~360
    private String wind_speed;                  //風速，單位km/h（當unit=c時）、mph（當unit=f時）
    private String wind_scale;                  //風力等級

    public Weather() {
    }

    protected Weather(Parcel in) {
        date = in.readString();
        text_day = in.readString();
        code_day = in.readString();
        text_night = in.readString();
        code_night = in.readString();
        high = in.readString();
        low = in.readString();
        precip = in.readString();
        wind_direction = in.readString();
        wind_direction_degree = in.readString();
        wind_speed = in.readString();
        wind_scale = in.readString();
    }

    public static final Creator CREATOR = new Creator() {
        @Override
        public Weather createFromParcel(Parcel in) {
            return new Weather(in);
        }

        @Override
        public Weather[] newArray(int size) {
            return new Weather[size];
        }
    };

    public String getDate() {
        return date;
    }

    public String getText_day() {
        return text_day;
    }

    public String getCode_day() {
        return code_day;
    }

    public String getText_night() {
        return text_night;
    }

    public String getCode_night() {
        return code_night;
    }

    public String getHigh() {
        return high;
    }

    public String getLow() {
        return low;
    }

    public String getPrecip() {
        return precip;
    }

    public String getWind_direction() {
        return wind_direction;
    }

    public String getWind_direction_degree() {
        return wind_direction_degree;
    }

    public String getWind_speed() {
        return wind_speed;
    }

    public String getWind_scale() {
        return wind_scale;
    }

    public void setDate(String date) {
        this.date = date;
    }

    public void setText_day(String text_day) {
        this.text_day = text_day;
    }

    public void setCode_day(String code_day) {
        this.code_day = code_day;
    }

    public void setText_night(String text_night) {
        this.text_night = text_night;
    }

    public void setCode_night(String code_night) {
        this.code_night = code_night;
    }

    public void setHigh(String high) {
        this.high = high;
    }

    public void setLow(String low) {
        this.low = low;
    }

    public void setPrecip(String precip) {
        this.precip = precip;
    }

    public void setWind_direction(String wind_direction) {
        this.wind_direction = wind_direction;
    }

    public void setWind_direction_degree(String wind_direction_degree) {
        this.wind_direction_degree = wind_direction_degree;
    }

    public void setWind_speed(String wind_speed) {
        this.wind_speed = wind_speed;
    }

    public void setWind_scale(String wind_scale) {
        this.wind_scale = wind_scale;
    }

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(date);
        dest.writeString(text_day);
        dest.writeString(code_day);
        dest.writeString(text_night);
        dest.writeString(code_night);
        dest.writeString(high);
        dest.writeString(low);
        dest.writeString(precip);
        dest.writeString(wind_direction);
        dest.writeString(wind_direction_degree);
        dest.writeString(wind_speed);
        dest.writeString(wind_scale);
    }

    @Override
    public String toString() {
        return "Weather{" +
                "date='" + date + '\'' +
                ", text_day='" + text_day + '\'' +
                ", code_day='" + code_day + '\'' +
                ", text_night='" + text_night + '\'' +
                ", code_night='" + code_night + '\'' +
                ", high='" + high + '\'' +
                ", low='" + low + '\'' +
                ", precip='" + precip + '\'' +
                ", wind_direction='" + wind_direction + '\'' +
                ", wind_direction_degree='" + wind_direction_degree + '\'' +
                ", wind_speed='" + wind_speed + '\'' +
                ", wind_scale='" + wind_scale + '\'' +
                '}';
    }
}

            **fragment文件** 

HomeFragment

public class HomeFragment extends Fragment {
    private PagerSlidingTabStrip pst;
    private ViewPager vp;
    private List fragmentList;
    private List> channelList;
    private List titles;
    private NewsFragmentAdapter nfa;

    public HomeFragment() {
        // Required empty public constructor
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.home_layout, container, false);
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        fragmentList = new ArrayList<>();
        titles = new ArrayList<>();
        pst = (PagerSlidingTabStrip) getView().findViewById(R.id.pst);
        vp = (ViewPager) getView().findViewById(R.id.vp);
        nfa = new NewsFragmentAdapter(getChildFragmentManager(), fragmentList, titles);
        vp.setAdapter(nfa);
        vp.setOffscreenPageLimit(2);
        pst.setViewPager(vp);
        pst.setIndicatorHeight(0);
        pst.setUnderlineHeight(0);
        pst.setShouldExpand(true);
        //讀取文件   文件名
        String fileName = "channel.txt";
        //獲得文件所在的包名
        String pn = getActivity().getPackageName();
        //如果存在頻道文件則讀取   否則 從網絡獲取
        if (FileUitlity.fileExists(pn + "/" + fileName)) {
            String ja = FileUitlity.readFileFromSdcard(pn + "/" + fileName);
            try {
                Log.d("=====", "讀取文件成功");
                Log.d("====1=", ja);
                initFragment(new JSONArray(ja));
            } catch (JSONException e) {
                e.printStackTrace();
            }
        } else {
            new GetChannel().execute(UrlUtil.channelUrl);
        }
    }

    //獲取頻道的異步任務類
    public class GetChannel extends AsyncTask {
        @Override
        protected String doInBackground(String... strings) {
            return HttpUtil.HttpGet(strings[0]);
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            //解析頻道json數據
            try {
                JSONObject jsonObject = new JSONObject(s);
                JSONObject body = jsonObject.getJSONObject("showapi_res_body");
                JSONArray ja = body.getJSONArray("channelList");
                if (ja.length() > 0) {
                    String pn = getActivity().getPackageName();
                    FileUitlity.getInstance(getActivity(), pn);
                    String result = FileUitlity.saveFileToSdcard(pn + "/channel.txt",
                            ja.toString());
                    if (result.equals("ok")) {
                        Log.d("=====", "文件保存成功");
                    } else {
                        Log.d("=====", "文件保存失敗");
                    }
                }
                initFragment(ja);
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
    }

    //初始化fragment
    public void initFragment(JSONArray ja) throws JSONException {
        //解析完頻道數據後  放入channelList中
        channelList = new ArrayList<>();
        for (int i = 0; i < ja.length(); i++) {
            JSONObject obj = (JSONObject) ja.get(i);
            String id = obj.getString("channelId");
            String name = obj.getString("name");
            HashMap map = new HashMap();
            map.put("id", id);
            map.put("name", name);
            channelList.add(map);
            titles.add(name);
        }
        //根據頻道數新建fragment
        for (int i = 0; i < channelList.size(); i++) {
            Fragment fragment = new NewsFragment();
            Bundle bundle = new Bundle();
            //獲取頻道的id和name   並把他們傳到NewsFragment中去
            bundle.putString("id", channelList.get(i).get("id"));
            bundle.putString("name", channelList.get(i).get("name"));
            //把頻道的id和name放入相應的fragment中去
            fragment.setArguments(bundle);
            fragmentList.add(fragment);
        }
        pst.notifyDataSetChanged();
        nfa.notifyDataSetChanged();
    }
}

NewsFragment

public class NewsFragment extends Fragment {
    private PullToRefreshListView prlv;
    private NewsBaseAdapter nba;
    private List newsList;
    private NewsCacheDao newsCacheDao;
    private String url;
    private TextView tv;
    private int page = 1;
    private String id, name;
    //Handler要用OS包裡的  Handler的聲明方式不同 大括號後面要加分號
    private Handler handler = new Handler() {
        //handleMessag在主線程中運行  相當於異步任務類裡的OnPostExcute()
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            //判斷屬於哪個線程進行實現
            if (msg.what == 1) {
                Bundle bundle = msg.getData();
                List list = bundle.getParcelableArrayList("cache");
                newsList.addAll(list);
                nba.notifyDataSetChanged();
                //tv.setText("讀取緩存成功");
                new GetNews().execute(url);
            }
        }
    };

    public NewsFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_news, container, false);
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        newsCacheDao = new NewsCacheDao(getActivity());
        newsList = new ArrayList<>();
        tv = (TextView) getView().findViewById(R.id.tv);
        prlv = (PullToRefreshListView) getView().findViewById(R.id.prlv);
        nba = new NewsBaseAdapter(newsList,getActivity());
        prlv.setAdapter(nba);
        //設置上下都可以刷新
        prlv.setMode(PullToRefreshBase.Mode.BOTH);
        //注冊監聽
        prlv.setOnRefreshListener(new prlvLisen());
        Bundle bundle = getArguments();
        //接收HomeFragment中傳過來的數據   這樣才能知道現在處於哪個頻道下  然後根據頻道的id和name加載不同的數據
        id = bundle.getString("id");
        name = bundle.getString("name");
        url = UrlUtil.newsUrl + "?channelId=" + id
                + "&channelName=" + name + "&needHtml=1";
        //執行線程要用run
        //new GetCache(id).run();
        new Thread(new GetCache()).start();
        //getCache(id);
        //new GetNews().execute(url);（這一句轉去 getCache裡寫）
    }

    //讀取數據庫緩存 線程
    public class GetCache implements Runnable {

        //run()在子線程中運行
        @Override
        public void run() {
            Bundle bundle = new Bundle();
            ArrayList list = newsCacheDao.searchNews(id);
            bundle.putParcelableArrayList("cache", list);
            //tv.setText("讀取緩存成功");
            //nba.notifyDataSetChanged();
            //new GetNews().execute(url);
            Message message = new Message();
            //如果有需要的話先把數據放入bundle裡  再放入message裡
            //message.setData();
            message.setData(bundle);
            message.what = 1;
            //告訴它子線程已經執行完了  要返回子線程中去handler.sendMessage()
            handler.sendMessage(message);
        }
    }

    //加載網絡數據 異步任務類
    public class GetNews extends AsyncTask {
        @Override
        protected String doInBackground(String... strings) {
            return HttpUtil.HttpGet(strings[0]);
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            //解析 新聞數據
            try {
                JSONObject obj = new JSONObject(s);
                JSONObject body = obj.getJSONObject("showapi_res_body");
                JSONObject pageBean = body.getJSONObject("pagebean");
                JSONArray contentList = pageBean.getJSONArray("contentlist");
                if (page == 1) {
                    newsList.clear();
                }
                //在獲取網絡的時候清空list（防止重復） 不是清空數據庫
                for (int i = 0; i < contentList.length(); i++) {
                    JSONObject jo = (JSONObject) contentList.get(i);
                    //MyNews要有一個空的構造  不然這句話報錯
                    MyNews myNews = new MyNews();
                    myNews.setTitle(jo.getString("title"));
                    myNews.setPubDate(jo.getString("pubDate"));
                    myNews.setImageurls(jo.getString("imageurls"));
                    myNews.setSource(jo.getString("source"));
                    myNews.setHtml(jo.getString("html"));
                    myNews.setChannelId(jo.getString("channelId"));
                    newsCacheDao.addNews(myNews);
                    newsList.add(myNews);
                }
                nba.notifyDataSetChanged();
                prlv.onRefreshComplete();
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
    }

    //    public void getCache(String id) {
//        //讀本地緩存
//        newsList.addAll(newsCacheDao.searchNews(id));
//        nba.notifyDataSetChanged();
//        //如果沒有加載網絡
//        if (newsList.size() == 0) {
//            new GetNews().execute(url);
//        }
//    }

    //下拉上拉 監聽 內部類
    public class prlvLisen implements PullToRefreshBase.OnRefreshListener2 {

        @Override
        public void onPullDownToRefresh(PullToRefreshBase refreshView) {
            page = 1;
            url = UrlUtil.newsUrl + "?channelId=" + id
                    + "&channelName=" + name + "&page=" + page + "&needHtml=1";
            new GetNews().execute(url);
        }

        @Override
        public void onPullUpToRefresh(PullToRefreshBase refreshView) {
            page++;
            url = UrlUtil.newsUrl + "?channelId=" + id
                    + "&channelName=" + name + "&page=" + page + "&needHtml=1";
            new GetNews().execute(url);
        }
    }

MyFragment

public class MyFragment extends Fragment {
    private KenBurnsView img;
    private ImageView collection;


    public MyFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.my_layout, container, false);
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        img= (KenBurnsView) getView().findViewById(R.id.img);
        collection= (ImageView) getView().findViewById(R.id.collection);
        collection.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent=new Intent(getActivity(), CollectionActivity.class);
                startActivity(intent);
            }
        });
    }

TopicFragment（裡面為天氣）

public class TopicFragment extends Fragment {
    private RequestQueue queue;
    private SwipeRefreshLayout swip;
    private CardView card1, card2, card3;
    private WeatherCacheDao weatherCacheDao;

    public TopicFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.weather_layout, container, false);
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        card1 = (CardView) getView().findViewById(R.id.card1);
        card2 = (CardView) getView().findViewById(R.id.card2);
        card3 = (CardView) getView().findViewById(R.id.card3);
        weatherCacheDao = new WeatherCacheDao(getActivity());
        queue = Volley.newRequestQueue(getActivity());
        swip = (SwipeRefreshLayout) getView().findViewById(R.id.swip);
        //進度條背景色
        swip.setProgressBackgroundColorSchemeColor(getResources().getColor(R.color.colorPrimary));
        swip.setColorSchemeResources(R.color.colorAccent);
        swip.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            //下拉刷新時執行此方法   可以寫加載網絡。。。等命令
            public void onRefresh() {
                //.......
                //收起刷新進度條
                //swip.setRefreshing(false);
                //new Thread(new GetCache()).start();
                getWeather();
            }
        });
        readDatabase();
    }

    public void readDatabase() {
        List list = weatherCacheDao.searchWeather();
        //去生成Weather的toString方法
        paraseList(list);
    }

      //獲取天氣
    public void getWeather() {
        String url = UrlUtil.weatherUrl + "?location=yantai";
        StringGetRequest sgr = new StringGetRequest(Request.Method.GET, url, new
                Response.Listener() {
                    @Override
                    public void onResponse(String s) {
                        if (!s.equals("")) {
                            try {
                                JSONObject obj = new JSONObject(s);
                                JSONArray results = obj.getJSONArray("results");
                                JSONArray ja1 = ((JSONObject) (results.get(0))).getJSONArray("daily");
                                Gson gson = new Gson();
                                List list = gson.fromJson(ja1.toString(), new TypeToken>() {
                                }.getType());
                                //只要一刷新就把緩存的清空掉
                                weatherCacheDao.deleteAll();
                                paraseList(list);
                                //                for (int i = 0; i < results.length(); i++) {
//                    JSONObject jo = results.getJSONObject(i);
//                    Weather weather = new Weather();
//                    weather.setDate(jo.getString("date"));
//                    weather.setText_day(jo.getString("text_day"));
//                    weather.setCode_day(jo.getString("code_day"));
//                    weather.setText_night(jo.getString("text_night"));
//                    weather.setCode_night(jo.getString("code_nigh"));
//                    weather.setHigh(jo.getString("high"));
//                    weather.setLow(jo.getString("low"));
//                    weather.setPrecip(jo.getString("precip"));
//                    weather.setWind_direction(jo.getString("wind_direction"));
//                    weather.setWind_direction_degree(jo.getString("wind_direction_degree"));
//                    weather.setWind_speed(jo.getString("wind_speed"));
//                    weather.setWind_scale(jo.getString("wind_scale"));
//                    weatherList.add(weather);
//                }

                            } catch (JSONException e) {
                                e.printStackTrace();
                            }
                        }
                        swip.setRefreshing(false);
                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError volleyError) {
                swip.setRefreshing(false);
            }
        });
        sgr.putHeaders("apikey", "3f37b44e3115841957414d7c4bf6c0f5");
        queue.add(sgr);
    }

    //解析weather
    public void paraseList(List list) {
        for (int i = 0; i < list.size(); i++) {
            View view = LayoutInflater.from(getActivity()).inflate(R.layout.weather_content, null);
            Weather day = list.get(i);
            weatherCacheDao.addWeather(day);
            TextView date = (TextView) view.findViewById(R.id.date);
            TextView text_day = (TextView) view.findViewById(R.id.text_day);
            TextView code_day = (TextView) view.findViewById(R.id.code_day);
            TextView text_night = (TextView) view.findViewById(R.id.text_night);
            TextView code_night = (TextView) view.findViewById(R.id.code_night);
            TextView high = (TextView) view.findViewById(R.id.high);
            TextView low = (TextView) view.findViewById(R.id.low);
            TextView precip = (TextView) view.findViewById(R.id.precip);
            TextView wind_direction = (TextView) view.findViewById(R.id.wind_direction);
            TextView wind_direction_degree = (TextView) view.findViewById(R.id.wind_direction_degree);
            TextView wind_speed = (TextView) view.findViewById(R.id.wind_speed);
            TextView wind_scale = (TextView) view.findViewById(R.id.wind_scale);
            date.setText(day.getDate());
            text_day.setText(day.getText_day());
            code_day.setText(day.getCode_day());
            text_night.setText(day.getText_night());
            code_night.setText(day.getCode_night());
            high.setText(day.getHigh());
            low.setText(day.getLow());
            precip.setText(day.getPrecip());
            wind_direction.setText(day.getWind_direction());
            wind_direction_degree.setText(day.getWind_direction_degree());
            wind_scale.setText(day.getWind_scale());
            wind_speed.setText(day.getWind_speed());
            if (i == 0) {
                if (card1.getChildCount() > 0) {
                    card1.removeAllViews();
                }
                card1.addView(view);
            }
            if (i == 1) {
                if (card2.getChildCount() > 0) {
                    card2.removeAllViews();
                }
                card2.addView(view);
            }
            if (i == 2) {
                if (card3.getChildCount() > 0) {
                    card3.removeAllViews();
                }
                card3.addView(view);
            }
        }
    }
}

                       **util工具類**

public class HttpUtil {
    public static String HttpGet(String uri){
        HttpURLConnection con = null;
        BufferedReader reader = null;
        InputStream is = null;
        StringBuilder sbd = new StringBuilder();
        try {
            URL url = new URL(uri);
            con = (HttpURLConnection) url.openConnection();
            con.setConnectTimeout(5*1000);
            con.setReadTimeout(5*1000);
            con.setRequestProperty("apikey","5b46143955a4b1ff1b470a94315625cd");
            con.connect();
            if(con.getResponseCode()==200){
                is = con.getInputStream();
                reader = new BufferedReader(new InputStreamReader(is));
                String strRead = null;
                while ((strRead = reader.readLine()) != null) {
                    sbd.append(strRead);
                    sbd.append("\r\n");
                }
                return sbd.toString();
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if(reader!=null){
                try {
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return "";
    }

}

public class FileUitlity {
    private static String ROOT_CACHE;
    private static FileUitlity instance = null;

    private FileUitlity() {
    }

    //創建文件夾
    public static FileUitlity getInstance(Context context, String root_dir) {
        if (instance == null) {
            if (Environment.getExternalStorageState().equals(
                    Environment.MEDIA_MOUNTED)) {
                ROOT_CACHE = (Environment.getExternalStorageDirectory() + "/"
                        + root_dir + "/");
            } else {
                ROOT_CACHE = (context.getFilesDir().getAbsolutePath() + "/" + root_dir + "/");
            }
            File dir = new File(ROOT_CACHE);
            if (!dir.exists()) {
                dir.mkdirs();
            }
            instance = new FileUitlity();
        }
        return instance;
    }

    public File makeDir(String dir) {
        File fileDir = new File(ROOT_CACHE + dir);
        if (fileDir.exists()) {
            return fileDir;
        } else {
            fileDir.mkdirs();
            return fileDir;
        }
    }

    //判斷文件是否存在SD卡
    public static boolean fileExists(String fileName) {
        String state = Environment.getExternalStorageState();
        if (!state.equals(Environment.MEDIA_MOUNTED)) {
            return false;
        } else {
            File root = Environment.getExternalStorageDirectory();
            File file = new File(root, fileName);
            return file.exists();
        }
    }

    //保存文件到SD卡
    public static String saveFileToSdcard(String fileName, String content) {
        String state = Environment.getExternalStorageState();
        if (!state.equals(Environment.MEDIA_MOUNTED)) {
            return "SD卡未就緒";
        }
        File root = Environment.getExternalStorageDirectory();
        FileOutputStream fos = null;
        try {
            fos = new FileOutputStream(root + "/" + fileName);
            fos.write(content.getBytes());
            return "ok";
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (fos != null) {
                try {
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return "";
    }

    //讀取SD卡文件
    public static String readFileFromSdcard(String fileName) {
        String statue = Environment.getExternalStorageState();
        if (!statue.equals(Environment.MEDIA_MOUNTED)) {
            return "";
        } else {
            File root = Environment.getExternalStorageDirectory();
            BufferedReader reader = null;
            FileInputStream fis = null;
            StringBuilder sbd = new StringBuilder();
            try {
                fis = new FileInputStream(root + "/" + fileName);
                reader = new BufferedReader(new InputStreamReader(fis));
                String row = "";
                while ((row = reader.readLine()) != null) {
                    sbd.append(row);
                }
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                if (reader != null) {
                    try {
                        reader.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
            return sbd.toString();
        }
    }
}

public class StringGetRequest extends StringRequest {
    private Map header;

    public StringGetRequest(int method, String url, Response.Listener listener, Response.ErrorListener errorListener) {
        super(method, url, listener, errorListener);
        header = new HashMap<>();
    }

    public void putHeaders(String key, String value) {
        header.put(key, value);
    }

    public Map getHeaders() throws AuthFailureError {
        return header;
    }

}

public class StringPostRequest extends StringRequest {
    private Map params;
    private Map header;

    public StringPostRequest(String url, Listener listener,
                             ErrorListener errorListener) {
        //super實際調用了StringRequest的四參構造
        super(Method.POST, url, listener, errorListener);
        params = new HashMap();
        header = new HashMap();
    }

    @Override
    //回調方法   用的時候往Map裡放值就可以
    protected Map getParams() throws AuthFailureError {
        return params;
    }

    public void putParams(String key, String value) {
        this.params.put(key, value);
    }

    public Map getHeaders() throws AuthFailureError {
        return header;
    }

    public void putHeaders(String key, String value) {
        this.header.put(key, value);
    }
}

public class UrlUtil {
    //獲取頻道的網絡接口
    public static String channelUrl = "http://apis.baidu.com/showapi_open_bus/channel_news/channel_news";
    /*
    /獲取頻道對應新聞的網絡接口
    get請求參數：
    channelId   ：新聞頻道id，必須精確匹配
    channelName ：新聞頻道名稱，可模糊匹配
    title       ：新聞標題，模糊匹配
    page        ：頁數，默認1。每頁最多20條記
    needContent：是否需要返回正文，1為需要
    needHtml：是否需要返回正文的html格式，1為需要
     */
    //獲取新聞的網絡接口
    public static String newsUrl = "http://apis.baidu.com/showapi_open_bus/channel_news/search_news";
    /*
    參數名 類型  必填  參數位置    描述           默認值
 location   string  是       urlParam    所查詢的位置     beijing
 language  string   否       urlParam    語言             zh-Hans
 unit      string   否       urlParam    單位             c
 start     string   否       urlParam    起始時間         0
 days      string   否       urlParam    天數             3
     */
    //獲取天氣的網絡接口
    public static String weatherUrl = "http://apis.baidu.com/thinkpage/weather_api/suggestion";
}

public class PhotoViewPager extends ViewPager
{
    private float mTrans;
    private float mScale;
    /**
     * 最大的縮小比例
     */
    private static final float SCALE_MAX = 0.0f;
    /**
     * 保存position與對於的View
     */
    private HashMap mChildrenViews = new LinkedHashMap();
    /**
     * 滑動時左邊的元素
     */
    private View mLeft;
    /**
     * 滑動時右邊的元素
     */
    private View mRight;

    public PhotoViewPager(Context context, AttributeSet attrs)
    {
        super(context, attrs);
    }

    @Override
    public void onPageScrolled(int position, float positionOffset,
            int positionOffsetPixels)
    {

//      Log.e(TAG, "position=" + position+", positionOffset = "+positionOffset+" ,positionOffsetPixels =  " + positionOffsetPixels+" , currentPos = " + getCurrentItem());

        //滑動特別小的距離時，我們認為沒有動，可有可無的判斷
        float effectOffset = isSmall(positionOffset) ? 0 : positionOffset;

        //獲取左邊的View
        mLeft = findViewFromObject(position);
        //獲取右邊的View
        mRight = findViewFromObject(position + 1);

        // 添加切換動畫效果
        animateStack(mLeft, mRight, effectOffset, positionOffsetPixels);
        super.onPageScrolled(position, positionOffset, positionOffsetPixels);
    }

    public void setObjectForPosition(View view, int position)
    {
        mChildrenViews.put(position, view);
    }

    /**
     * 通過過位置獲得對應的View
     * 
     * @param position
     * @return
     */
    public View findViewFromObject(int position)
    {
        return mChildrenViews.get(position);
    }

    private boolean isSmall(float positionOffset)
    {
        return Math.abs(positionOffset) < 0.0001;
    }

    protected void animateStack(View left, View right, float effectOffset,
            int positionOffsetPixels)
    {
        if (right != null)
        {
            /**
             * 縮小比例 如果手指從右到左的滑動（切換到後一個）：0.0~1.0，即從一半到最大
             * 如果手指從左到右的滑動（切換到前一個）：1.0~0，即從最大到一半
             */
            mScale = (1 - SCALE_MAX) * effectOffset + SCALE_MAX;
            /**
             * x偏移量： 如果手指從右到左的滑動（切換到後一個）：0-720 如果手指從左到右的滑動（切換到前一個）：720-0
             */
            mTrans = -getWidth() - getPageMargin() + positionOffsetPixels;
            right.setScaleX(mScale);
            right.setScaleY(mScale);
            right.setTranslationX(mTrans);
        }
        if (left != null)
        {
            left.bringToFront();
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        try {
            return super.onTouchEvent(ev);
        } catch (IllegalArgumentException ex) {
            ex.printStackTrace();
        }
        return false;
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        try {
            return super.onInterceptTouchEvent(ev);
        } catch (IllegalArgumentException ex) {
            ex.printStackTrace();
        }
        return false;
    }
}

                     **布局文件**        

    <framelayout android:id="@+id/fl" android:layout_height="0dp" android:layout_weight="1" android:layout_width="match_parent">

    </framelayout>

    

    

    



    

    





    

        

        

        



    

    
    




    

    




    

    
    

    




    

    





    

    

        

        
    

    

        

        

    

    

        

        

    

    

        

        

    

    

        

        

    


    

        

        

    

    

        

        

    

    

        

        

    



<framelayout android:layout_height="match_parent" android:layout_width="match_parent" xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto">

    
     
         
     
     
         
     
     
         
     
    

</framelayout>

運行效果展示：

顯示收藏的新聞：