android - 使用 AlarmManager 时后台 Activity 被阻止。 (Android Q 隐私更改)

Question

在我的项目中，我使用 AlarmManager为了每天触发AlarmClock但是当出现 toast 消息后启动警报的时间到了:

Background activity start from com.example.nameOfApp blocked. See g.co/dev/bgblock

更新代码:

--------setAlarmClock方法--------

private void setAlarmClock(Calendar calendar, int alarmId, String time, String timeOfTheDay, boolean action) {
        AlarmManager manager = (AlarmManager) getActivity().getSystemService(Context.ALARM_SERVICE);
        Intent intent = new Intent(getActivity(), AlarmClockReceiver.class);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(getActivity(), alarmId, intent, 0);

        if (action) {
            manager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),
                    AlarmManager.INTERVAL_DAY, pendingIntent);
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                manager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);
            }
        } else {
            manager.cancel(pendingIntent);
        }
    }

--------AlarmClockReceiver类--------

public class AlarmClockReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        String alarmAction = AlarmClock.ACTION_SET_ALARM;
        Intent i = new Intent(alarmAction);
        i.putExtra(AlarmClock.EXTRA_SKIP_UI, true);
        i.putExtra(AlarmClock.EXTRA_MESSAGE, "Time for taking medicine!");
        i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(i);
    }
}

此外，我在 AndroidManifest 中包含了以下行:

<uses-permission android:name="com.android.alarm.permission.SET_ALARM"/>

我知道它与新的 Android Q 隐私更改有关。来自前述link据说:

Apps running on Android Q can start activities only when one or more of the following conditions are met:

...

The app receives a notification PendingIntent from the system. In the case of pending intents for services and broadcast receivers, the app can start activities for a few seconds after the pending intent is sent.

如果我理解正确的话，这正是我的情况。尽管如此，还是会出现上述 toast 消息。

Answer 1

只有当您使用 setContentIntent 方法在通知中设置 Intent 时，PendingIntent 才有效(为了启动 Activity )。所以你可以做的是发布一个通知而不是直接开始一个 Activity 。当用户点击通知时，挂起的 Intent 将用于启动 Activity 。 编辑:作为替代方案，您需要询问 SYSTEM_ALERT_WINDOW权限，但您将无法在 Android Go 上执行该应用，因为无法在该版本上使用此权限。