package com.app.lib; import android/54107.html">android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.os.PowerManager; /**  * Created by ${zyj} on 2016/6/21.  */ public class ScreenListener {   private Context mContext;   private ScreenBroadcastReceiver mScreenReceiver;   private ScreenStateListener mScreenStateListener;   public ScreenListener(Context context) {     mContext = context;     mScreenReceiver = new ScreenBroadcastReceiver();   }   /**    * screen狀態廣播接收者    */   private class ScreenBroadcastReceiver extends BroadcastReceiver {     private String action = null;     @Override     public void onReceive(Context context, Intent intent) {       action = intent.getAction();       if (Intent.ACTION_SCREEN_ON.equals(action)) { // 開屏         mScreenStateListener.onScreenOn();       } else if (Intent.ACTION_SCREEN_OFF.equals(action)) { // 鎖屏         mScreenStateListener.onScreenOff();       } else if (Intent.ACTION_USER_PRESENT.equals(action)) { // 解鎖         mScreenStateListener.onUserPresent();       }     }   }   /**    * 開始監聽screen狀態    *    * @param listener    */   public void begin(ScreenStateListener listener) {     mScreenStateListener = listener;     registerListener();     getScreenState();   }   /**    * 獲取screen狀態    */   private void getScreenState() {     PowerManager manager = (PowerManager) mContext         .getSystemService(Context.POWER_SERVICE);     if (manager.isScreenOn()) {       if (mScreenStateListener != null) {         mScreenStateListener.onScreenOn();       }     } else {       if (mScreenStateListener != null) {         mScreenStateListener.onScreenOff();       }     }   }   /**    * 停止screen狀態監聽    */   public void unregisterListener() {     mContext.unregisterReceiver(mScreenReceiver);   }   /**    * 啟動screen狀態廣播接收器    */   private void registerListener() {     IntentFilter filter = new IntentFilter();     filter.addAction(Intent.ACTION_SCREEN_ON);     filter.addAction(Intent.ACTION_SCREEN_OFF);     filter.addAction(Intent.ACTION_USER_PRESENT);     mContext.registerReceiver(mScreenReceiver, filter);   }   public interface ScreenStateListener {// 返回給調用者屏幕狀態信息     public void onScreenOn();     public void onScreenOff();     public void onUserPresent();   } } 

package com.app.lib; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.widget.Toast; public class MainActivity extends AppCompatActivity {   private ScreenListener screenListener ;   @Override   protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.activity_main);     screenListener = new ScreenListener( MainActivity.this ) ;     screenListener.begin(new ScreenListener.ScreenStateListener() {       @Override       public void onScreenOn() {         Toast.makeText( MainActivity.this , "屏幕打開了" , Toast.LENGTH_SHORT ).show();       }       @Override       public void onScreenOff() {         Toast.makeText( MainActivity.this , "屏幕關閉了" , Toast.LENGTH_SHORT ).show();       }       @Override       public void onUserPresent() {         Toast.makeText( MainActivity.this , "解鎖了" , Toast.LENGTH_SHORT ).show();       }     });   } }