Android 在线更新apk

1.获取当前包的信息：

 1 PackageManager manager = Main.this.getPackageManager();
 2 try {
 3     PackageInfo info = manager.getPackageInfo(Main.this.getPackageName(), 0);
 4     String appVersion = info.versionName; // 版本名
 5     currentVersionCode = info.versionCode; // 版本号
 6     System.out.println(currentVersionCode + " " + appVersion);
 7 } catch (NameNotFoundException e) {
 8    // TODO Auto-generated catch blockd
 9    e.printStackTrace();
10 }
11 //上面是获取manifest中的版本数据，使用了versionCode
12 //在从服务器获取到最新版本的versionCode,比较
13 showUpdateDialog();

2.直接启动线程进行下载管理并安装：

private void showUpdateDialog() {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("检测到新版本");
        builder.setMessage("是否下载更新?");
        builder.setPositiveButton("更新", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                // TODO Auto-generated method stub11                 showDownloadDialog();
　　　　　　　　　　  dialog.dismiss();
            }
        }).setNegativeButton("稍后更新", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                // TODO Auto-generated method stub
　　　　　　　　　dialog.dismiss();
            }
        });
        builder.show();
    }

3.弹出下载更新进度框，进行apk下载更新：

private void showDownloadDialog(){
        AlertDialog.Builder builder = new Builder(mContext);
        builder.setTitle("软件版本更新");
        
        final LayoutInflater inflater = LayoutInflater.from(mContext);
        View v = inflater.inflate(R.layout.progress, null);
        mProgress = (ProgressBar)v.findViewById(R.id.progress);
        
        builder.setView(v);
        builder.setNegativeButton("取消", new OnClickListener() {    
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
                interceptFlag = true;
            }
        });
        downloadDialog = builder.create();
        downloadDialog.show();
        
        downloadApk();
    }

4.启动线程进行下载任务：

 /**
     * 下载apk
     */
    
    private void downloadApk(){
        downLoadThread = new Thread(mdownApkRunnable);
        downLoadThread.start();
    }

5.对于下载更新进度框的控制：interceptFlag

private Runnable mdownApkRunnable = new Runnable() {    
        @Override
        public void run() {
            try {
                URL url = new URL(apkUrl);
            
                HttpURLConnection conn = (HttpURLConnection)url.openConnection();
                conn.connect();
                int length = conn.getContentLength();
                InputStream is = conn.getInputStream();
                
                File file = new File(savePath);
                if(!file.exists()){
                    file.mkdir();
                }
                String apkFile = saveFileName;
                File ApkFile = new File(apkFile);
                FileOutputStream fos = new FileOutputStream(ApkFile);
                
                int count = 0;
                byte buf[] = new byte[1024];
                
                do{                      
                    int numread = is.read(buf);
                    count += numread;
                    progress =(int)(((float)count / length) * 100);
                    //更新进度
                    mHandler.sendEmptyMessage(DOWN_UPDATE);
                    if(numread <= 0){    
                        //下载完成通知安装
                        mHandler.sendEmptyMessage(DOWN_OVER);
                        break;
                    }
                    fos.write(buf,0,numread);
                }while(!interceptFlag);//点击取消就停止下载.
                
                fos.close();
                is.close();
            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch(IOException e){
                e.printStackTrace();
            }
            
        }
    };

6.进行提示框进度条更新：

private Handler mHandler = new Handler(){
        public void handleMessage(Message msg) {
            switch (msg.what) {
            case DOWN_UPDATE:
                mProgress.setProgress(progress);
                break;
            case DOWN_OVER:
                
                installApk();
                break;
            default:
                break;
            }
        };
    };

7.下载完成，进行apk安装：

 /**
     * 安装apk
     */
    private void installApk(){
        File apkfile = new File(saveFileName);
        if (!apkfile.exists()) {
            return;
        }    
        Intent i = new Intent(Intent.ACTION_VIEW);
        i.setDataAndType(Uri.parse("file://" + apkfile.toString()), "application/vnd.android.package-archive"); 
        mContext.startActivity(i);
    
    }