抽象的DeviceScreenListener：

package zhangphil.app;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;

/**
 * Created by Phil on 2017/7/18.
 */

/**
 * 对于开发者来说，可能更多需要关注ScreenStateListener中的两个函数：
 * void onScreenOff(); 屏幕锁定
 * void onUserPresent(); 屏幕处于解锁状态且可以正常使用
 */
public class DeviceScreenListener {
    private Context mContext;
    private ScreenBroadcastReceiver mScreenBroadcastReceiver;
    private ScreenStateListener mScreenStateListener;

    public DeviceScreenListener(Context context) {
        mContext = context;
        mScreenBroadcastReceiver = new ScreenBroadcastReceiver();
    }

    /**
     * 设备屏幕状态广播接收者
     */
    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)) {
                /**
                 * 屏幕亮
                 */
                mScreenStateListener.onScreenOn();
            } else if (Intent.ACTION_SCREEN_OFF.equals(action)) {
                /**
                 * 屏幕锁定
                 */
                mScreenStateListener.onScreenOff();
            } else if (Intent.ACTION_USER_PRESENT.equals(action)) {
                /**
                 * 屏幕解锁了且可以使用
                 */
                mScreenStateListener.onUserPresent();
            }
        }
    }

    /**
     * 开始监听屏幕开/关状态
     *
     * @param listener
     */
    public void register(ScreenStateListener listener) {
        mScreenStateListener = listener;

        /**
         * 注册屏幕设备开屏/锁屏的状态监听
         */
        IntentFilter filter = new IntentFilter();
        filter.addAction(Intent.ACTION_SCREEN_ON);
        filter.addAction(Intent.ACTION_SCREEN_OFF);
        filter.addAction(Intent.ACTION_USER_PRESENT);
        mContext.registerReceiver(mScreenBroadcastReceiver, filter);

        //initScreenState(); //可选
    }


    /**
     * 代码启动阶段获取设备屏幕初始状态
     */
    /**
     private void initScreenState() {
     PowerManager manager = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE);

     if (manager.isScreenOn()) {
     if (mScreenStateListener != null) {
     mScreenStateListener.onScreenOn();
     }
     } else {
     if (mScreenStateListener != null) {
     mScreenStateListener.onScreenOff();
     }
     }
     }
     */

    /**
     * 注销屏幕设备开屏/锁屏的状态监听
     */
    public void unregister() {
        mContext.unregisterReceiver(mScreenBroadcastReceiver);
        mScreenBroadcastReceiver = null;
        mScreenStateListener = null;
    }


    interface ScreenStateListener {
        /**
         * 此时屏幕已经点亮，但可能是在锁屏状态
         * 比如用户之前锁定了屏幕，按了电源键启动屏幕，则回调此方法
         */
        void onScreenOn();

        /**
         * 屏幕被锁定
         */
        void onScreenOff();

        /**
         * 屏幕解锁且可以正常使用
         */
        void onUserPresent();
    }
}

在一个activity中使用：

package zhangphil.app;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;

public class MainActivity extends AppCompatActivity {

    DeviceScreenListener listener = new DeviceScreenListener(this);

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        /**
         * 注册监听
         */
        listener.register(new DeviceScreenListener.ScreenStateListener() {
            @Override
            public void onScreenOn() {
                Log.d("设备屏幕", "屏幕点亮");
            }

            @Override
            public void onScreenOff() {
                Log.d("设备屏幕", "屏幕锁定");
            }

            @Override
            public void onUserPresent() {
                Log.d("设备屏幕", "屏幕解锁且可以正常使用");
            }
        });
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        /**
         * 注销监听
         */
        listener.unregister();
    }
}