Question

我在Android应用程序中有以下代码。它目前所做的是，在Calendar变量传递的指定时间，它打开RunningActivity（它是空白的），振动并发送通知。即使我按下主页按钮并且它在后台运行，它也会启动一个新的空白RunningActivity并振动并发送通知。我试图找出如何在RunningActivity（振动并发送通知）中完成所有工作，而无需打开空白的RunningActivity，允许应用程序保持在后台。

实际调用通知或振动时，我不需要帮助。我只需要知道如何在特定时间运行RunningActivity onCreate中的操作，而无需打开/显示RunningActivity。如下所示，我设置了一个带有AlarmManagager的PendingIntent，问题是它正在启动一个Activity并在我想要它做的时候显示它是振动/发送通知。

public void startAlarm(Activity activity, Calendar when){       
    currentTimerHour = when.get(Calendar.HOUR);
    currentTimerMin = when.get(Calendar.MINUTE);

    Intent intent = new Intent(activity, RunningActivity.class);
    PendingIntent pendingIntent = PendingIntent.getActivity(activity, 12345, intent, PendingIntent.FLAG_CANCEL_CURRENT);
    AlarmManager am = (AlarmManager)activity.getSystemService(Activity.ALARM_SERVICE);
    am.set(AlarmManager.RTC_WAKEUP, when.getTimeInMillis(), pendingIntent);
}

RunningActivity类：

public class RunningActivity extends Activity {
@Override
public void onCreate(Bundle bundle){
    super.onCreate(bundle);

    Vibrator v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
    v.vibrate(500);

    NotificationCompat.Builder mBuilder;
    mBuilder = new NotificationCompat.Builder(this)
            .setSmallIcon(R.drawable.ic_launcher)
            .setContentTitle("My notification")
            .setContentText("Hello World!");

    Intent resultIntent = new Intent(this, MainActivity.class);

    TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
    stackBuilder.addParentStack(MainActivity.class);
    stackBuilder.addNextIntent(resultIntent);
    PendingIntent resultPendingIntent =
            stackBuilder.getPendingIntent(
                    0,
                    PendingIntent.FLAG_UPDATE_CURRENT
            );
    mBuilder.setContentIntent(resultPendingIntent);
    NotificationManager mNotificationManager =
            (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    mNotificationManager.notify(0, mBuilder.build());
}

}

Answer 1

从背景发送通知：

public void createNotification(Context context) {

        // Prepare intent which is triggered if the
        // notification is selected
        Intent intent = new Intent(context,Myexample.class);

        PendingIntent pIntent = PendingIntent.getActivity(context, 0, intent, 0);



        Notification noti = new Notification.Builder(context)
        .setContentTitle("My Title")
        .setContentText("My message.")
        .setSmallIcon(R.drawable.app_icon)

        .setContentIntent(pIntent).build();

        @SuppressWarnings("static-access")
        NotificationManager notificationManager = 
        (NotificationManager)context.getSystemService(context.NOTIFICATION_SERVICE);
        // Hide the notification after its selected
        noti.flags |= Notification.FLAG_AUTO_CANCEL;


        noti.flags |= Notification.FLAG_SHOW_LIGHTS;

    notificationManager.notify(0, noti);

}

Answer 2

您可以使用服务。在服务上添加振动器类，并在需要时调用它。您还可以在班级上创建一个方法，并在需要时调用它。

Vibrator v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
v.vibrate(500);

Android - 振动没有显示新的活动？

2 个答案: