可以使用BroadcastReceiver和PowerManager实现。代码示例如下：

创建BroadcastReceiver：

public class ScreenReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (action.equals(Intent.ACTION_SCREEN_OFF)) {
            // 屏幕关闭
        } else if (action.equals(Intent.ACTION_SCREEN_ON)) {
            // 屏幕打开
        } else if (action.equals(Intent.ACTION_USER_PRESENT)) {
            // 解锁屏幕
        }
    }
}

创建服务：

public class ScreenService extends Service {

    private ScreenReceiver mScreenReceiver;

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        mScreenReceiver = new ScreenReceiver();
        IntentFilter filter = new IntentFilter();
        filter.addAction(Intent.ACTION_SCREEN_OFF);
        filter.addAction(Intent.ACTION_SCREEN_ON);
        filter.addAction(Intent.ACTION_USER_PRESENT);
        registerReceiver(mScreenReceiver, filter);
        return START_STICKY;
    }

    @Override
    public void onDestroy() {
        unregisterReceiver(mScreenReceiver);
        super.onDestroy();
    }

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

在AndroidManifest.xml文件中声明服务：

在应用程序中启动服务：

Intent intent = new Intent(this, ScreenService.class);
startService(intent);

这样就可以检测屏幕的状态了。当屏幕关闭、打开或解锁时，BroadcastReceiver会接收到相应的Intent。