Android软件自动更新功能实现的方法

 privateintprogress;//当前进度
 privateThreaddownLoadThread;//下载线程
 privatebooleaninterceptFlag=false;//用户取消下载
 //通知处理刷新界面的handler
 privateHandlermHandler=newHandler(){
  @SuppressLint("HandlerLeak")
  @Override
  publicvoidhandleMessage(Messagemsg){
   switch(msg.what){
   caseDOWN_UPDATE:
    mProgress.setProgress(progress);
    break;
   caseDOWN_OVER:
    installApk();
    break;
   }
   super.handleMessage(msg);
  }
 };
 publicUpdateManger(Contextcontext){
  this.mContext=context;
 }
 //显示更新程序对话框，供主程序调用
 publicvoidcheckUpdateInfo(){
  showNoticeDialog();
 }
 privatevoidshowNoticeDialog(){
  android.app.AlertDialog.Builderbuilder=newandroid.app.AlertDialog.Builder(
    mContext);//Builder，可以通过此builder设置改变AleartDialog的默认的主题样式及属性相关信息
  builder.setTitle("软件版本更新");
  builder.setMessage(updateMsg);
  builder.setPositiveButton("下载",newOnClickListener(){
   @Override
   publicvoidonClick(DialogInterfacedialog,intwhich){
    dialog.dismiss();//当取消对话框后进行操作一定的代码？取消对话框
    showDownloadDialog();
   }
  });
  builder.setNegativeButton("以后再说",newOnClickListener(){
   @Override
   publicvoidonClick(DialogInterfacedialog,intwhich){
    dialog.dismiss();
   }
  });
  noticeDialog=builder.create();
  noticeDialog.show();
 }
 protectedvoidshowDownloadDialog(){
  android.app.AlertDialog.Builderbuilder=newandroid.app.AlertDialog.Builder(mContext);
  builder.setTitle("软件版本更新");
  finalLayoutInflaterinflater=LayoutInflater.from(mContext);
  Viewv=inflater.inflate(R.layout.progress,null);
  mProgress=(ProgressBar)v.findViewById(R.id.progress);
  builder.setView(v);//设置对话框的内容为一个View
  builder.setNegativeButton("取消",newOnClickListener(){
   @Override
   publicvoidonClick(DialogInterfacedialog,intwhich){
    dialog.dismiss();
    interceptFlag=true;
   }
  });
  downloadDialog=builder.create();
  downloadDialog.show();
  downloadApk();
 }
 privatevoiddownloadApk(){
  downLoadThread=newThread(mdownApkRunnable);
  downLoadThread.start();
 }
 protectedvoidinstallApk(){
  Fileapkfile=newFile(saveFileName);
  if(!apkfile.exists()){
   return;
  }
  Intenti=newIntent(Intent.ACTION_VIEW);
  i.setDataAndType(Uri.parse("file://"+apkfile.toString()),
    "application/vnd.android.package-archive");//File.toString()会返回路径信息
  mContext.startActivity(i);
 }
 privateRunnablemdownApkRunnable=newRunnable(){
  @Override
  publicvoidrun(){
   URLurl;
   try{
    url=newURL(apkUrl);
    HttpURLConnectionconn=(HttpURLConnection)url.openConnection();
    conn.connect();
    intlength=conn.getContentLength();
    InputStreamins=conn.getInputStream();
    Filefile=newFile(savePath);
    if(!file.exists()){
     file.mkdir();
    }
    StringapkFile=saveFileName;
    FileApkFile=newFile(apkFile);
    FileOutputStreamoutStream=newFileOutputStream(ApkFile);
    intcount=0;
    bytebuf[]=newbyte[1024];
    do{
     intnumread=ins.read(buf);
     count+=numread;
     progress=(int)(((float)count/length)*100);
     //下载进度
     mHandler.sendEmptyMessage(DOWN_UPDATE);
     if(numread<=0){
      //下载完成通知安装
      mHandler.sendEmptyMessage(DOWN_OVER);
      break;
     }
     outStream.write(buf,0,numread);
    }while(!interceptFlag);//点击取消停止下载
    outStream.close();
    ins.close();
   }catch(Exceptione){
    e.printStackTrace();
   }
  }
 };
}