相关疑难解决方法(0)

我正在尝试从已经获得锁定的服务开始活动,如下所示:

Intent i = new Intent(context, MyActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_NO_USER_ACTION);
startActivity(i);

活动清单声明如下:

<activity
        android:name=".MyActivity"
        android:configChanges="orientation|screenSize|keyboardHidden|keyboard|navigation"
        android:excludeFromRecents="true"
        android:launchMode="singleInstance"
        android:screenOrientation="nosensor"
        android:showOnLockScreen="true"
        android:taskAffinity=""
        android:theme="@style/MyTheme" />

最后,on onCreate()或on onAttachedToWindow()(我试过两个),我添加以下标志:

final Window win = getWindow();
win.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
            | WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);
win.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
            | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
            | WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON);

问题是我第一次startActivity()从我的服务中调用时,屏幕会亮起,但活动本身并没有显示出来.它显示锁定屏幕.每次后续调用startActivity()工作正常,但我找不到这种奇怪行为的原因.

我已经尝试过建议获取完整的唤醒锁而不是部分,根据以下SO答案更改清单中的标志和值:

• 当屏幕被唤醒并且锁定屏幕未禁用时,Android活动不显示
• 调用BroadcastReceiver时如何解锁屏幕？
• 以编程方式在android中打开屏幕
• Android Galaxy S4 - 在锁定屏幕上可见的活动

请注意,我的主题不是对话框,而是全屏活动.

还有其他想法吗？

当我设置的闹钟激活时,我想打开显示屏,解锁手机并将我的应用程序带到前面.

public class CountDownAlarm extends BroadcastReceiver {

    public CountDownAlarm(){ }

    public CountDownAlarm(Context context, int timeoutInSeconds){
        AlarmManager alarmMgr = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
        Intent intent = new Intent(context, CountDownAlarm.class);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
        Calendar time = Calendar.getInstance();
        time.setTimeInMillis(System.currentTimeMillis());
        time.add(Calendar.SECOND, timeoutInSeconds);
        alarmMgr.set(AlarmManager.RTC_WAKEUP, time.getTimeInMillis(), pendingIntent);
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        PowerManager pm = (PowerManager)context.getSystemService(Context.POWER_SERVICE); 
        WakeLock wl = pm.newWakeLock(PowerManager.ACQUIRE_CAUSES_WAKEUP, "TRAININGCOUNTDOWN"); 
        wl.acquire(); 
        Intent i = new Intent(context, MyActivity.class); 
        i.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT); 
        context.startActivity(i); 
        wl.release(); 
    }
}

来自我的CountDownTimer的振动器被激活,但显示器没有打开...

public class MyActivity extends Activity implements OnClickListener …