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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