Android版本檢測升級

我們應該都有類似的使用體驗，當一款APP需要更新是，進入界面會提醒有新的更新是否更新，這裡有那麼幾個步驟

1首先檢測當前版本
2判斷服務器中版本
3如果有更新則點擊更新，下載安裝包，下載完成後自動安裝

具體代碼怎麼實現呢？下面我們一起看一下

    /*
     * 獲取當前程序的版本號 
     */
    private String getVersionName() throws Exception{
        //獲取packagemanager的實例 
        PackageManager packageManager = getPackageManager();
        //getPackageName()是你當前類的包名，0代表是獲取版本信息
        PackageInfo packInfo = packageManager.getPackageInfo(getPackageName(), 0);
        return packInfo.versionName; 
    }

讀取服務器版本號

    /*
     * 用pull解析器解析服務器返回的xml文件 (xml封裝了版本號)
     */
    public static UpdataInfo getUpdataInfo(InputStream is) throws Exception{
        XmlPullParser  parser = Xml.newPullParser();  
        parser.setInput(is, utf-8);//設置解析的數據源 
        int type = parser.getEventType();
        UpdataInfo info = new UpdataInfo();//實體
        while(type != XmlPullParser.END_DOCUMENT ){
            switch (type) {
            case XmlPullParser.START_TAG:
                if(version.equals(parser.getName())){
                    info.setVersion(parser.nextText()); //獲取版本號
                }else if (url.equals(parser.getName())){
                    info.setUrl(parser.nextText()); //獲取要升級的APK文件
                }else if (description.equals(parser.getName())){
                    info.setDescription(parser.nextText()); //獲取該文件的信息
                }
                break;
            }
            type = parser.next();
        }
        return info;
    }

下載

    public static File getFileFromServer(String path, ProgressDialog pd) throws Exception{
        //如果相等的話表示當前的sdcard掛載在手機上並且是可用的
        if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
            URL url = new URL(path);
            HttpURLConnection conn =  (HttpURLConnection) url.openConnection();
            conn.setConnectTimeout(5000);
            //獲取到文件的大小 
            pd.setMax(conn.getContentLength());
            InputStream is = conn.getInputStream();
            File file = new File(Environment.getExternalStorageDirectory(), updata.apk);
            FileOutputStream fos = new FileOutputStream(file);
            BufferedInputStream bis = new BufferedInputStream(is);
            byte[] buffer = new byte[1024];
            int len ;
            int total=0;
            while((len =bis.read(buffer))!=-1){
                fos.write(buffer, 0, len);
                total+= len;
                //獲取當前下載量
                pd.setProgress(total);
            }
            fos.close();
            bis.close();
            is.close();
            return file;
        }
        else{
            return null;
        }
    }

版本匹配、自動安裝

    /*
     * 從服務器獲取xml解析並進行比對版本號 
     */
    public class CheckVersionTask implements Runnable{

        public void run() {
            try {
                //從資源文件獲取服務器 地址 
                String path = getResources().getString(R.string.serverurl);
                //包裝成url的對象 
                URL url = new URL(path);
                HttpURLConnection conn =  (HttpURLConnection) url.openConnection(); 
                conn.setConnectTimeout(5000);
                InputStream is =conn.getInputStream(); 
                info =  UpdataInfoParser.getUpdataInfo(is);

                if(info.getVersion().equals(versionname)){
                    Log.i(TAG,版本號相同無需升級);
                    LoginMain();
                }else{
                    Log.i(TAG,版本號不同 ,提示用戶升級 );
                    Message msg = new Message();
                    msg.what = UPDATA_CLIENT;
                    handler.sendMessage(msg);
                }
            } catch (Exception e) {
                // 待處理 
                Message msg = new Message();
                msg.what = GET_UNDATAINFO_ERROR;
                handler.sendMessage(msg);
                e.printStackTrace();
            } 
        }
    }

    Handler handler = new Handler(){

        @Override
        public void handleMessage(Message msg) {
            // TODO Auto-generated method stub
            super.handleMessage(msg);
            switch (msg.what) {
            case UPDATA_CLIENT:
                //對話框通知用戶升級程序 
                showUpdataDialog();
                break;
            case GET_UNDATAINFO_ERROR:
                //服務器超時 
                Toast.makeText(getApplicationContext(), 獲取服務器更新信息失敗, 1).show();
                LoginMain();
                break;  
            case DOWN_ERROR:
                //下載apk失敗
                Toast.makeText(getApplicationContext(), 下載新版本失敗, 1).show();
                LoginMain();
                break;  
            }
        }
    };

    /*
     * 
     * 彈出對話框通知用戶更新程序 
     * 
     * 彈出對話框的步驟：
     *  1.創建alertDialog的builder.  
     *  2.要給builder設置屬性, 對話框的內容,樣式,按鈕
     *  3.通過builder 創建一個對話框
     *  4.對話框show()出來  
     */
    protected void showUpdataDialog() {
        AlertDialog.Builder builer = new Builder(this) ; 
        builer.setTitle(版本升級);
        builer.setMessage(info.getDescription());
        //當點確定按鈕時從服務器上下載 新的apk 然後安裝 
        builer.setPositiveButton(確定, new OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
                Log.i(TAG,下載apk,更新);
                downLoadApk();
            }   
        });
        //當點取消按鈕時進行登錄
        builer.setNegativeButton(取消, new OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                // TODO Auto-generated method stub
                LoginMain();
            }
        });
        AlertDialog dialog = builer.create();
        dialog.show();
    }

    /*
     * 從服務器中下載APK
     */
    protected void downLoadApk() {
        final ProgressDialog pd;    //進度條對話框
        pd = new  ProgressDialog(this);
        pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        pd.setMessage(正在下載更新);
        pd.show();
        new Thread(){
            @Override
            public void run() {
                try {
                    File file = DownLoadManager.getFileFromServer(info.getUrl(), pd);
                    sleep(3000);
                    installApk(file);
                    pd.dismiss(); //結束掉進度條對話框
                } catch (Exception e) {
                    Message msg = new Message();
                    msg.what = DOWN_ERROR;
                    handler.sendMessage(msg);
                    e.printStackTrace();
                }
            }}.start();
    }

    //安裝apk 
    protected void installApk(File file) {
        Intent intent = new Intent();
        //執行動作
        intent.setAction(Intent.ACTION_VIEW);
        //執行的數據類型
        intent.setDataAndType(Uri.fromFile(file), application/vnd.android.package-archive);
        startActivity(intent);
    }

    /*
     * 進入程序的主界面
     */
    private void LoginMain(){
        Intent intent = new Intent(this,MainActivity.class);
        startActivity(intent);
        //結束掉當前的activity 
        this.finish();
    }

相關類

public class UpdataInfo {
    private String version;
    private String url;
    private String description;
    public String getVersion() {
        return version;
    }
    public void setVersion(String version) {
        this.version = version;
    }
    public String getUrl() {
        return url;
    }
    public void setUrl(String url) {
        this.url = url;
    }
    public String getDescription() {
        return description;
    }
    public void setDescription(String description) {
        this.description = description;
    }
}