android - 在解锁事件中显示屏幕/Activity ？

Question

我基本上想在屏幕解锁时显示一个屏幕，而不管应用程序是否已经在运行。

谁能告诉我如何在手机解锁后立即显示文本。从那时起我可以接受它。

到目前为止，我在网上找到了以下代码....

假设我想在手机解锁后立即显示 abc.xml。我如何将它添加到 ScreenReceiver 类中？

此外，我不想在应用程序运行时设置任何屏幕。我需要将下面的代码作为服务运行吗？

public class SampleActivity extends Activity {

//Declare the necessary variables
private BroadcastReceiver mReceiver;


   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);

     filter.addAction(Intent.ACTION_SCREEN_OFF);
     filter.addAction(Intent.ACTION_USER_PRESENT);

     mReceiver = new ScreenReceiver();
     registerReceiver(mReceiver, filter);

   }


    @Override
    public void onDestroy()
    {
        super.onDestroy();
        Log.v("$$$$$$", "In Method: onDestroy()");

        if (mReceiver != null)
        {
             unregisterReceiver(mReceiver);
             mReceiver = null;
        }          

    }

}

其中Screen Reciever类如下

public class ScreenReceiver extends BroadcastReceiver {

   @Override
   public void onReceive(Context context, Intent intent)
   {
      if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF))
      {    
            Log.v("$$$$$$", "In Method:  ACTION_SCREEN_OFF");
            // onPause() will be called.
      }
      else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON))
      {
            Log.v("$$$$$$", "In Method:  ACTION_SCREEN_ON");
            //onResume() will be called.

            //  Better check for whether the screen was already locked
            //if locked, do not take any resuming action in onResume()

            //Suggest you, not to take any resuming action here.       
      }
      else if(intent.getAction().equals(Intent.ACTION_USER_PRESENT))
      {
            Log.v("$$$$$$", "In Method:  ACTION_USER_PRESENT");
            //  Handle resuming events

      }

   }
}

Answer 1

首先，您不显示 abc.xml，而是显示 Activity 、对话框或其他 UI 组件。您可以设置一个广播接收器来监听 ACTION_BOOT_COMPLETED Intent 。设备启动完成后，您可以启动一个粘性服务来监听上述操作。假设您希望在 Activity 中显示 abc.xml，因此您需要从 if() 之一触发 startActivity上面的 block 。