Android--用DownLoadManager下载完成后启动安装

completeReceiver = new CompleteReceiver();
        registerReceiver(completeReceiver,new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));//注册广播

//接收到这个广播
    class CompleteReceiver extends BroadcastReceiver{
        @Override
        public void onReceive(Context context, Intent intent) {

            openFile(intent, context);//启动安装
        }
    }

//启动安装
    private void openFile(Intent intent,Context context){
        long myDownLoadId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID,-1);  //拿到下载的Id
        SharedPreferences preferences = context.getSharedPreferences("downloadcomplete",0);
        long refence = preferences.getLong("refernece",0);
        if (refence == myDownLoadId){     //如果是我们下载完成后发送的广播消息,那么启动并安装
            DownloadManager downloadManager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);
            Intent updateApk = new Intent(Intent.ACTION_VIEW);
            Uri downloadFileUri = downloadManager.getUriForDownloadedFile(myDownLoadId);
            updateApk.setDataAndType(downloadFileUri, "application/vnd.android.package-archive");
            updateApk.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            context.startActivity(updateApk);
        }
    }