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

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