Android 自动更新的实现

Android应用启动的时候,去取服务器上版本号 ,与当前应用的对比如果有更新则下载。

下面这个是获取当前应用的版本信息

private void getCurVersion() {
        try {
            PackageInfo pInfo = context.getPackageManager().getPackageInfo(
                    context.getPackageName(), 0);
            curVersion = pInfo.versionName;
            curVersionCode = pInfo.versionCode;
        } catch (NameNotFoundException e) {
            Log.e("update", e.getMessage());
            curVersion = "1.0.1";
            curVersionCode = 1;
        }

}

下面则是通过java net包来get版本信息,进行比较

服务器端格式如下    version_1.0.2


HttpURLConnection 获取输入流,再用

BufferedReader 缓冲流,readline成String,再比较

private boolean check_update(){
  String getstring = null;
  String version=null;
  getCurVersion();
  try {
   
   URL myurl=new URL(app_check);
   
   HttpURLConnection urlconnection=(HttpURLConnection) myurl.openConnection();
   urlconnection.setReadTimeout(50000);
   urlconnection.setConnectTimeout(50000);
   urlconnection.connect();
   InputStream in=urlconnection.getInputStream();
   
      BufferedReader buffread;
      buffread=new BufferedReader(new InputStreamReader(in,"utf-8"));
      String line;
    line=buffread.readLine();
    while(line!=null){
     getstring+=line;
     line=buffread.readLine();
     
    }
    int index=getstring.indexOf("version_");
    //2.0.1
    version=getstring.substring(index+8, index+13);
    in.close();
    Log.e("version",version);
  } catch (MalformedURLException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
    if(version!=null){
  if(version.compareTo(curVersion)>0)
   return true;
  else
   return false;
    }
    else
     return false;
 }

接下来则是弹出一对话框以及调用下载线程

private void showdownDialog(){
  AlertDialog.Builder dialog = new AlertDialog.Builder(context); 
        dialog.setTitle("软件版本更新"); 
        dialog.setMessage("有最新的app更新"); 
        dialog.setNegativeButton("以后再说", new OnClickListener(){

@Override
   public void onClick(DialogInterface arg0, int arg1) {
    // TODO Auto-generated method stub
    arg0.dismiss();
   }
       
        });
        dialog.setPositiveButton("确定", new OnClickListener(){

@Override
   public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    //确定里面调用下载线程,同时显示下载的那个进度对话框
    dialog.dismiss();
    cancel=true;
    downapk();
    showDownapk();
   }
       
        });
        dialog.show();
 }

最后则是发出一个Intent广播

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

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