如何提高从BroadcastReceiver的类警告对话框？ [英] How to raise an alert dialog from BroadcastReceiver class?

问题描述

我已经用在活动类的计时器方法。在该方法中我有意向活动类到的BroadcastReceiver 类。

I have used a timer method in an Activity class. In that method I have an intent from Activity class to a BroadcastReceiver class.

本的BroadcastReceiver 类将调用后台每隔15分钟用 AlarmManager 。

This BroadcastReceiver class will call on every 15 minutes at background by using AlarmManager.

在我所说的的BroadcastReceiver 类我想提出一个 AlertDialog 。

When I call the BroadcastReceiver class I would like to raise an AlertDialog.

public void timerMethod(){
    Intent intent = new Intent(Activity.this,
      BroadcastReceiverClass.class
    );

    PendingIntent sender = PendingIntent.getBroadcast(
      QualityCallActivity.this,0, intent, 0
    );

    // We want the alarm to go off 30 seconds from now.
    long firstTime = SystemClock.elapsedRealtime();

    AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE);
    am.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,
    firstTime, 60*1000, sender);
}

BroadcastReceiverClass.java

public void onReceive(Context context, Intent intent)
{
    dialogMethod();
}

我如何能提高从后台进程的 AlertDialog 从的BroadcastReceiver 类？

推荐答案

在短：是的不可以可以

只有活动的可以创建/显示对话框。事实上，这已被要求超过一次：

Only Activity's can create/show dialogs. In fact, this has been asked more then once:

• AlertDialog中的BroadcastReceiver
• <一个href="http://stackoverflow.com/questions/3835160/how-can-i-display-a-dialog-from-an-android-broadcast-receiver">How我可以从一个Android广播接收器显示一个对话框？

• AlertDialog in BroadcastReceiver
• How can I display a dialog from an Android broadcast receiver?

另外，为什么要启动一个对话框？

Also, why would you want to launch a Dialog?

• 如果用户不是在您的应用程序（比方说他玩 游戏）和您的对话框弹出，每15分钟，这将是非常 讨厌他。
• 如果用户在应用程序中，有几个其他的（更好 某些内容被执行适合）的方式来通知他。

• If the user is not in your application (let's say he's playing a Game) and your Dialog pops up every 15 minutes, this will be very annoying for him.
• If the user is in your application, there are several other (better suited) ways to notify him that something has been executed.

事实上，你可以创建/显示 吐司 从的BroadcastReceiver 。这吐司也将蜜蜂当用户应用程序中的不显示。

In fact, you can create/show a Toast from an BroadcastReceiver. This Toast will also bee shown when the user is not "in your application".

此外，您还可以发送从的BroadcastReceiver 的通知（在屏幕顶部显示在通知酒吧）。如何做到这一点一个教程（它不会从不同你如何做一个活动，但您使用通过上下文 -object从的onReceive - 方法）。

Also, you can send a Notification (shown in the Notification-Bar at the top of your screen) from a BroadcastReceiver. A tutorial on how to do this (it does not differ from how you do it in an Activity, except that you use the passed Context-Object from the onReceive-method).

当用户应用程序中的不是，是（在我看来）最适合解决这个问题的通知也将被显示。

The Notification will also be shown when the user is not "in your application" and is the (in my eyes) best suited solution to this problem.

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