显示解锁事件的屏幕/活动？

Question

我基本上想要显示一个屏幕，无论应用程序已经运行，屏幕解锁。

有人可以告诉我如何在手机解锁后立即显示文本。我可以从此继续。

我有下面的代码到现在，我在网上....

假设我想尽快把手机被解锁显示abc.xml发现。我将如何将它添加到ScreenReceiver类中？

另外我不想在应用程序运行时设置任何屏幕。是否需要运行下面的代码作为服务？

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; 
     }   

    } 

} 

其中屏幕Reciever类是如下

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，你不显示abc.xml，则显示一个活动，对话框或其他UI组件。您可以设置一个广播接收机，用于监听意图。一旦设备启动完成，您可以启动一项粘性服务来监听上面的操作。想必您在一项活动中需要显示abc.xml，因此您需要从if()块之一中触发startActivity。