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

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，希望对大家有所帮助