java版

不需要xml代码，直接java代码注册就好。

public class MainActivity extends AppCompatActivity {
    private static final String TAG = "MainActivity";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final IntentFilter filter = new IntentFilter();
        // 屏幕灭屏广播
        filter.addAction(Intent.ACTION_SCREEN_OFF);
        // 屏幕亮屏广播
        filter.addAction(Intent.ACTION_SCREEN_ON);

        BroadcastReceiver mScreenInfoReceiver = new BroadcastReceiver() {
            @Override
            public void onReceive(final Context context, final Intent intent) {
                Log.d(TAG, "onReceive");
                String action = intent.getAction();

                if (Intent.ACTION_SCREEN_ON.equals(action)) {
                    Log.d(TAG, "screen on");
                } else if (Intent.ACTION_SCREEN_OFF.equals(action)) {
                    Log.d(TAG, "screen off");
                }
            }
        };
        registerReceiver(mScreenInfoReceiver, filter);
    }
}

按锁屏键，测试效果：

kotlin版本

class MainActivity : AppCompatActivity() {
    companion object {
        private const val TAG = "MainActivity"
    }

    class ScreenReceiver : BroadcastReceiver() {

        override fun onReceive(context: Context, intent: Intent) {
            Log.d(TAG, "onReceive: ")
            var action = intent.getAction()
            if (Intent.ACTION_SCREEN_ON.equals(action)) {
                Log.d(TAG, "screen on")
            } else if (Intent.ACTION_SCREEN_OFF.equals(action)) {
                Log.d(TAG, "screen off")
            }
        }
    }


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        val filter = IntentFilter()
        filter.addAction(Intent.ACTION_SCREEN_OFF)
        filter.addAction(Intent.ACTION_SCREEN_ON)
        var receiver = ScreenReceiver()
        registerReceiver(receiver, filter)
    }
}