Tips·检测应用程序被卸载

幺鹿

发布于 2018-08-21 07:35:52

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代码可运行

文章被收录于专栏：Java呓语Java呓语

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代码可运行

前言

我们知道广播ACTION_PACKAGE_REMOVED可以监听应用程序卸载，但不幸的是这个意图被卸载的程序是不可知的，所以无法监听到自己的程序被卸载。

正文

当用户操作Settings -> Manage Apps -> Selects a particular application时，会收到一条包含其应用程序包名作为extras的广播消息 android.intent.action.QUERY_PACKAGE_RESTART。

当我们点击卸载按钮时，会打开卸载确认界面com.android.packageinstaller.UninstallerActivity。

卸载确认界面

我们应监听android.intent.action.QUERY_PACKAGE_RESTART广播，如果发现广播中的extras中的包名与应用程序匹配，我们就启动一个后台线程，并利用ActivityManager持续监控前台运行的Activity。

当后台线程发现前台的活动是com.android.packageinstaller.UninstallerActivity，这便确认用户是希望卸载我们的APP。在用户确认卸载前的时刻，我们可以做一些事件（比如：弹出对话框挽留用户等），但是需要确保允许用户卸载APP。

代码实现

1、添加权限

<uses-permission android:name="android.permission.GET_TASKS"/>

2、注册广播接收器

  <receiver android:name=".UninstallIntentReceiver">
      <intent-filter android:priority="0">
            <action android:name="android.intent.action.QUERY_PACKAGE_RESTART" />
            <data android:scheme="package" />
      </intent-filter>
 </receiver>

public class UninstallIntentReceiver extends BroadcastReceiver{

    @Override
    public void onReceive(Context context, Intent intent) {
        // fetching package names from extras
        String[] packageNames = intent.getStringArrayExtra("android.intent.extra.PACKAGES"); 

        if(packageNames!=null){
            for(String packageName: packageNames){
                if(packageName!=null && packageName.equals("YOUR_APPLICATION_PACKAGE_NAME")){
                    // User has selected our application under the Manage Apps settings
                    // now initiating background thread to watch for activity
                    new ListenActivities(context).start();

                }
            }
        }
    }

}

3、后台监视器线程监听前台活动变化

class ListenActivities extends Thread{
    boolean exit = false;
    ActivityManager am = null;
    Context context = null;

    public ListenActivities(Context con){
        context = con;
        am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
    }

    public void run(){

        Looper.prepare();

        while(!exit){

             // get the info from the currently running task
             List< ActivityManager.RunningTaskInfo > taskInfo = am.getRunningTasks(MAX_PRIORITY); 

             String activityName = taskInfo.get(0).topActivity.getClassName();


             Log.d("topActivity", "CURRENT Activity ::"
                     + activityName);

             if (activityName.equals("com.android.packageinstaller.UninstallerActivity")) {
                // User has clicked on the Uninstall button under the Manage Apps settings

                 //do whatever pre-uninstallation task you want to perform here
                 // show dialogue or start another activity or database operations etc..etc..

                // context.startActivity(new Intent(context, MyPreUninstallationMsgActivity.class).setFlags(Intent.FLAG_ACTIVITY_NEW_TASK));
                 exit = true;
                 Toast.makeText(context, "Done with preuninstallation tasks... Exiting Now", Toast.LENGTH_SHORT).show();
            } else if(activityName.equals("com.android.settings.ManageApplications")) {
                // back button was pressed and the user has been taken back to Manage Applications window
                          // we should close the activity monitoring now
                exit=true;
            }
        }
        Looper.loop();
    }
}