Android 监听屏幕是否锁屏的实例代码

今天，简单讲讲如何监听手机屏幕是否锁屏。

实现方法：

1）通过BroadcastReceiver接收广播Intent.ACTION_SCREEN_ON和Intent.ACTION_SCREEN_OFF可以判断屏幕状态是否锁屏，但是只有屏幕状态发生改变时才会发出广播；

2）如果要在屏幕状态发生改变之前就想获取屏幕状态，可以通过反射机制调用PowerManager的isScreenOn方法 。

具体实现，见代码：

直接上代码：

1.定义一个接收广播的类

package com.app.lib;
import 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状态广播接收者
  */
 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)) { // 开屏
       mScreenStateListener.onScreenOn();
     } else if (Intent.ACTION_SCREEN_OFF.equals(action)) { // 锁屏
       mScreenStateListener.onScreenOff();
     } else if (Intent.ACTION_USER_PRESENT.equals(action)) { // 解锁
       mScreenStateListener.onUserPresent();
     }
   }
 }
 /**
  * 开始监听screen状态
  *
  * @param listener
  */
 public void begin(ScreenStateListener listener) {
   mScreenStateListener = listener;
   registerListener();
   getScreenState();
 }
 /**
  * 获取screen状态
  */
 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状态监听
  */
 public void unregisterListener() {
   mContext.unregisterReceiver(mScreenReceiver);
 }
 /**
  * 启动screen状态广播 *
  */
 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 {// 返回给调用者屏幕状态信息
   public void onScreenOn();
   public void onScreenOff();
   public void onUserPresent();
 }
}

2、使用：

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 , "屏幕打开了" , Toast.LENGTH_SHORT ).show();
     }
     @Override
     public void onScreenOff() {
       Toast.makeText( MainActivity.this , "屏幕关闭了" , Toast.LENGTH_SHORT ).show();
     }
     @Override
     public void onUserPresent() {
       Toast.makeText( MainActivity.this , "解锁了" , Toast.LENGTH_SHORT ).show();
     }
   });
 }
}

总结

以上所述是小编给大家介绍的Android 监听屏幕是否锁屏的实例代码网站的支持！

来源：http://blog.csdn.net/bzlj2912009596/article/details/77940983