android 监听屏幕是否锁屏

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();           }       });     }}

android 监听屏幕是否锁屏就讲完了。

就这么简单。