通过广播来监听屏幕点亮和关闭状态

监听屏幕的状态就需要广播，我们还必须要动态注册广播才能实现监听屏幕亮暗（静态注册无效）。我这里是在service做的处理，没啥技术难度，直接上代码。

package com.kale.camerademo;

import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.IBinder;

/**
 * @author:金凯
 * @tips :
 * @web :http://blog.csdn.net/lamp_zy/article/details/7968938
 * @date :2014-2-27
 */
public class ScreenService extends Service {

    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }

    public void onCreate() {
        super.onCreate();
        /* 注册屏幕唤醒时的广播 */
        IntentFilter mScreenOnFilter = new IntentFilter("android.intent.action.SCREEN_ON");
        ScreenService.this.registerReceiver(mScreenOReceiver, mScreenOnFilter);

        /* 注册机器锁屏时的广播 */
        IntentFilter mScreenOffFilter = new IntentFilter("android.intent.action.SCREEN_OFF");
        ScreenService.this.registerReceiver(mScreenOReceiver, mScreenOffFilter);
    }

    public void onDestroy() {
        super.onDestroy();
        ScreenService.this.unregisterReceiver(mScreenOReceiver);
    }

    /**
     * 锁屏的管理类叫KeyguardManager，
     * 通过调用其内部类KeyguardLockmKeyguardLock的对象的disableKeyguard方法可以取消系统锁屏，
     * newKeyguardLock的参数用于标识是谁隐藏了系统锁屏
     */
    private BroadcastReceiver mScreenOReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();

            if (action.equals("android.intent.action.SCREEN_ON")) {
                System.out.println("—— SCREEN_ON ——");
            } else if (action.equals("android.intent.action.SCREEN_OFF")) {
                System.out.println("—— SCREEN_OFF ——");
            }
        }

    };

}

启动服务：

startService(new Intent(MainActivity.this,ScreenService.class));

运行结果：