android如何监听屏幕是否锁屏

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。