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 Android教程網 >> Android技術 >> 關於Android編程 >> Android兩個ListView共用一個萬能的BaseAdapter

Android兩個ListView共用一個萬能的BaseAdapter

編輯：關於Android編程

這裡寫圖片描述

升級之前的MyAdapter.java

package run.yang.com.listviewactivedemo;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.LinkedList;

/**
 * Created by yang_zzheng on 2016/7/14
 * [email protected]
 */
public class MyAdapter extends BaseAdapter {

    private Context mContext;
    private LinkedList mData;

    public MyAdapter() {
    }

    public MyAdapter(LinkedList mData, Context mContext) {
        this.mData = mData;
        this.mContext = mContext;
    }

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

    @Override
    public Object getItem(int position) {
        return null;
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder = null;
        if (convertView == null) {
            convertView = LayoutInflater.from(mContext).inflate(R.layout.item_list, parent, false);
            holder = new ViewHolder();
            holder.img_icon = (ImageView) convertView.findViewById(R.id.img_icon);
            holder.txt_content = (TextView) convertView.findViewById(R.id.txt_content);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }
        holder.img_icon.setImageResource(mData.get(position).getImgId());
        holder.txt_content.setText(mData.get(position).getContent());
        return convertView;
    }

    //添加一個元素
    public void add(Data data) {
        if (mData == null) {
            mData = new LinkedList<>();
        }
        mData.add(data);
        notifyDataSetChanged();
    }

    //往特定位置，添加一個元素
    public void add(int position,Data data){
        if (mData == null) {
            mData = new LinkedList<>();
        }
        mData.add(position, data);
        notifyDataSetChanged();
    }

    public void remove(Data data) {
        if(mData != null) {
            mData.remove(data);
        }
        notifyDataSetChanged();
    }

    public void remove(int position) {
        if(mData != null) {
            mData.remove(position);
        }
        notifyDataSetChanged();
    }

    public void clear() {
        if(mData != null) {
            mData.clear();
        }
        notifyDataSetChanged();
    }





    private class ViewHolder {
        ImageView img_icon;
        TextView txt_content;
    }

}

如何升級參考

http://blog.csdn.net/coder_pig/article/details/48654899

升級1：將Entity設置成泛型

好的，畢竟我們傳遞過來的Entitiy實體類可能千奇百怪，比如有Person，Book，Wether等，所以我們 將Entity設置成泛型

升級2：ViewHolder類的升級改造

升級3：定義一個抽象方法，完成ViewHolder與Data數據集的綁定

升級4：修改getView()部分的內容

下面看看我們的代碼：

布局文件：activity_main.xml

展示視圖控制文件：MainActivity

package run.yang.com.listviewallmyadapterdemo;


import android.content.Context;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ListView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private Context mContext;
    private ListView list_book;
    private ListView list_app;

    private MyAdapter myAdapter1 = null;
    private MyAdapter myAdapter2 = null;
    private List mData1 = null;
    private List mData2 = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mContext = MainActivity.this;
        init();

    }

    private void init() {

        list_book = (ListView) findViewById(R.id.list_book);
        list_app = (ListView) findViewById(R.id.list_app);

        //數據初始化
        mData1 = new ArrayList();
        mData1.add(new App(R.mipmap.iv_icon_baidu,"百度"));
        mData1.add(new App(R.mipmap.iv_icon_douban,"豆瓣"));
        mData1.add(new App(R.mipmap.iv_icon_zhifubao,"支付寶"));

        mData2 = new ArrayList();
        mData2.add(new Book("《第一行代碼Android》","郭霖"));
        mData2.add(new Book("《Android群英傳》","徐宜生"));
        mData2.add(new Book("《Android開發藝術探索》","任玉剛"));

        //Adapter初始化
        myAdapter1 = new MyAdapter((ArrayList)mData1,R.layout.item_one) {
            @Override
            public void bindView(ViewHolder holder, App obj) {
                holder.setImageResource(R.id.img_icon,obj.getaIcon());
                holder.setText(R.id.txt_aname,obj.getaName());
            }
        };
        myAdapter2 = new MyAdapter((ArrayList)mData2,R.layout.item_two) {
            @Override
            public void bindView(ViewHolder holder, Book obj) {
                holder.setText(R.id.txt_bname,obj.getbName());
                holder.setText(R.id.txt_bauthor,obj.getbAuthor());
            }
        };

        //ListView設置下Adapter：
        list_book.setAdapter(myAdapter2);
        list_app.setAdapter(myAdapter1);

    }


}

寫個Book.java，數據展示一

package run.yang.com.listviewallmyadapterdemo;

/**
 * Created by yang_zzheng on 2016/7/15
 * [email protected]
 */
public class Book {
    private String bName;
    private String bAuthor;

    public Book() {
    }

    public Book(String bName, String bAuthor) {
        this.bName = bName;
        this.bAuthor = bAuthor;
    }

    public String getbName() {
        return bName;
    }

    public String getbAuthor() {
        return bAuthor;
    }

    public void setbName(String bName) {
        this.bName = bName;
    }

    public void setbAuthor(String bAuthor) {
        this.bAuthor = bAuthor;
    }
}

寫個App.java，數據展示二

package run.yang.com.listviewallmyadapterdemo;

/**
 * Created by yang_zzheng on 2016/7/15
 * [email protected]
 */
public class App {
    private int aIcon;
    private String aName;

    public App() {
    }

    public App(int aIcon, String aName) {
        this.aIcon = aIcon;
        this.aName = aName;
    }

    public int getaIcon() {
        return aIcon;
    }

    public String getaName() {
        return aName;
    }

    public void setaIcon(int aIcon) {
        this.aIcon = aIcon;
    }

    public void setaName(String aName) {
        this.aName = aName;
    }
}

自定義的BaseAdapter—->MyAdapter.java

package run.yang.com.listviewallmyadapterdemo;

import android.content.Context;
import android.util.SparseArray;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.ArrayList;

/**
 * Created by yang_zzheng on 2016/7/15
 * [email protected]
 */
public abstract class MyAdapter extends BaseAdapter {

    private ArrayList mData;
    private int mLayoutRes;           //布局id


    public MyAdapter() {
    }

    public MyAdapter(ArrayList mData, int mLayoutRes) {
        this.mData = mData;
        this.mLayoutRes = mLayoutRes;
    }

    @Override
    public int getCount() {
        return mData != null ? mData.size() : 0;
    }

    @Override
    public T getItem(int position) {
        return mData.get(position);
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder = ViewHolder.bind(parent.getContext(), convertView, parent, mLayoutRes
                , position);
        bindView(holder, getItem(position));
        return holder.getItemView();
    }

    public abstract void bindView(ViewHolder holder, T obj);

    //添加一個元素
    public void add(T data) {
        if (mData == null) {
            mData = new ArrayList<>();
        }
        mData.add(data);
        notifyDataSetChanged();
    }

    //往特定位置，添加一個元素
    public void add(int position, T data) {
        if (mData == null) {
            mData = new ArrayList<>();
        }
        mData.add(position, data);
        notifyDataSetChanged();
    }

    public void remove(T data) {
        if (mData != null) {
            mData.remove(data);
        }
        notifyDataSetChanged();
    }

    public void remove(int position) {
        if (mData != null) {
            mData.remove(position);
        }
        notifyDataSetChanged();
    }

    public void clear() {
        if (mData != null) {
            mData.clear();
        }
        notifyDataSetChanged();
    }


    public static class ViewHolder {

        private SparseArray mViews;   //存儲ListView 的 item中的View
        private View item;                  //存放convertView
        private int position;               //游標
        private Context context;            //Context上下文

        //構造方法，完成相關初始化
        private ViewHolder(Context context, ViewGroup parent, int layoutRes) {
            mViews = new SparseArray<>();
            this.context = context;
            View convertView = LayoutInflater.from(context).inflate(layoutRes, parent, false);
            convertView.setTag(this);
            item = convertView;
        }

        //綁定ViewHolder與item
        public static ViewHolder bind(Context context, View convertView, ViewGroup parent,
                                      int layoutRes, int position) {
            ViewHolder holder;
            if (convertView == null) {
                holder = new ViewHolder(context, parent, layoutRes);
            } else {
                holder = (ViewHolder) convertView.getTag();
                holder.item = convertView;
            }
            holder.position = position;
            return holder;
        }

        @SuppressWarnings("unchecked")
        public  T getView(int id) {
            T t = (T) mViews.get(id);
            if (t == null) {
                t = (T) item.findViewById(id);
                mViews.put(id, t);
            }
            return t;
        }


        /**
         * 獲取當前條目
         */
        public View getItemView() {
            return item;
        }

        /**
         * 獲取條目位置
         */
        public int getItemPosition() {
            return position;
        }

        /**
         * 設置文字
         */
        public ViewHolder setText(int id, CharSequence text) {
            View view = getView(id);
            if (view instanceof TextView) {
                ((TextView) view).setText(text);
            }
            return this;
        }

        /**
         * 設置圖片
         */
        public ViewHolder setImageResource(int id, int drawableRes) {
            View view = getView(id);
            if (view instanceof ImageView) {
                ((ImageView) view).setImageResource(drawableRes);
            } else {
                view.setBackgroundResource(drawableRes);
            }
            return this;
        }


        /**
         * 設置點擊監聽
         */
        public ViewHolder setOnClickListener(int id, View.OnClickListener listener) {
            getView(id).setOnClickListener(listener);
            return this;
        }

        /**
         * 設置可見
         */
        public ViewHolder setVisibility(int id, int visible) {
            getView(id).setVisibility(visible);
            return this;
        }

        /**
         * 設置標簽
         */
        public ViewHolder setTag(int id, Object obj) {
            getView(id).setTag(obj);
            return this;
        }

        //其他方法可自行擴展

    }

}

當然少不了我們的列表項目布局item_one.xml

當然少不了我們的列表項目布局item_two.xml

 

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