从服务调用 startActivity 不允许关闭屏幕

Question

您好 Stackoverflow 用户，

我正在尝试使用以下代码为这种情况打开新活动if(intent.getAction().equals(Intent.ACTION_SCREEN_ON))（该服务具有广播接收器）

    Intent intent = new Intent(context, OverlayActivity.class);
    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

问题是当新活动打开时，屏幕超时设置无法像以前那样工作并且屏幕始终亮着。活动中没有标志 FLAG_KEEP_SCREEN_ON。活动只有空的 onCreate() 方法。我不知道是什么问题。为什么屏幕超时（15 秒）后屏幕不关闭？当我在没有此活动的情况下运行服务时，它会像往常一样禁用屏幕。

Answer 1

对于 Intent.ACTION_SCREEN_OFF 和 Intent.ACTION_SCREEN_ON，您不能在 Android 清单中声明它们！

可能是你犯了这个错误。

检查此代码 -

public class ScreenReceiver extends BroadcastReceiver {

    public static boolean wasScreenOn = true;

    @Override
    public void onReceive(final Context context, final Intent intent) {
        if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
            // do whatever you need to do here
            wasScreenOn = false;
        } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
            // and do whatever you need to do here
            wasScreenOn = true;
        }
    }

}

在活动中 -

public class ExampleActivity extends Activity {

    private BroadcastReceiver mReceiver = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // initialize receiver
        final IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
        filter.addAction(Intent.ACTION_SCREEN_OFF);
        mReceiver = new ScreenReceiver();
        registerReceiver(mReceiver, filter);
        // your code
    }

    @Override
    protected void onPause() {
        // when the screen is about to turn off
        if (ScreenReceiver.wasScreenOn) {
            // this is the case when onPause() is called by the system due to a screen state change
            Log.e("MYAPP", "SCREEN TURNED OFF");
        } else {
            // this is when onPause() is called when the screen state has not changed
        }
        super.onPause();
    }

    @Override
    protected void onResume() {
        super.onResume();
        // only when screen turns on
        if (!ScreenReceiver.wasScreenOn) {
            // this is when onResume() is called due to a screen state change
            Log.e("MYAPP", "SCREEN TURNED ON");
        } else {
            // this is when onResume() is called when the screen state has not changed
        }
    }

    @Override
    protected void onDestroy() {
        if (mReceiver != null) {
            unregisterReceiver(mReceiver);
            mReceiver = null;
        }
        super.onDestroy();
    }

}

这或许可以解决您的问题。

干杯:)