Android C2DM接收时显示警报对话框

我有一个C2DM的工作实现，如果我用祝酒词来处理收到的每条消息

相反，我希望使用一个警报对话框，用户对其说“确定”，以便确认消息

我为此编写的代码在show（）行生成了一个异常。我认为问题可能与所使用的上下文有关（？）

全班（根据评论中的要求）：

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无法显示来自BroadcastReceiver和Service的对话框。请改为使用通知。无法在BroadcastReceiver中显示对话框。我也有同样的问题。我创建了一个活动，它继承了android的风格：style/Theme.Dialog。这使活动看起来像一个对话框

显示更多代码。你把这些代码放在哪里了。如果你的上下文没有问题就可以了。它位于

公共类MyC2DM extends BroadcastReceiver

内部

私有void handleMessage（上下文上下文，意图）

。已将整个类添加到提交中。

AlertDialog.Builder alertbox = new AlertDialog.Builder(context);
alertbox.setMessage("Received Push Notification");
alertbox.setNeutralButton("OK", new DialogInterface.OnClickListener() {

    public void onClick(DialogInterface arg0, int arg1) {
    // TODO Auto-generated method stub

    } });
    AlertDialog alert = alertbox.create();
    alert.show();

public class MyC2DM 

extends BroadcastReceiver {
    public MyC2DM()
    {


    }

    @Override
    public void onReceive(Context context, Intent intent)
        {
            Log.i("Recieve","2");
            //Toast.makeText(context, "Intent Receive!", Toast.LENGTH_SHORT).show();
            if (intent.getAction().equals("com.google.android.c2dm.intent.REGISTRATION"))
            {
                handleRegistration(context, intent);
            } 
            else if (intent.getAction().equals("com.google.android.c2dm.intent.RECEIVE")) 
            {
                handleMessage(context, intent);
            }
         }

        private void handleRegistration(Context context, Intent intent)
        {

            String registration = intent.getStringExtra("registration_id"); 
            if (intent.getStringExtra("error") != null)
            {
                Toast.makeText(context, "Reg Error!", Toast.LENGTH_LONG).show();
                // Registration failed, should try again later.
            } 
            else if (intent.getStringExtra("unregistered") != null)
            {
                // unregistration done, new messages from the authorized sender will be rejected
                Toast.makeText(context, "Unreg!", Toast.LENGTH_LONG).show();
            } 
            else if (registration != null) 
            {
               // Send the registration ID to the 3rd party site that is sending the messages.
               // This should be done in a separate thread.
               // When done, remember that all registration is done.

            //  UserId = customer.getId();
            //  Log.i("id",String.valueOf(UserId));

                String RegId = registration; 
                Log.i("reg",String.valueOf(RegId) );
            }
        }

        private void handleMessage(Context context, Intent intent)
        {
            // Message handler.
             Log.i("Recieve","MESSAGE");

             AlertDialog.Builder alertbox = new AlertDialog.Builder(context);
             alertbox.setMessage("Received Push Notification");

             alertbox.setNeutralButton("OK", new DialogInterface.OnClickListener() {

                public void onClick(DialogInterface arg0, int arg1) {
                    // TODO Auto-generated method stub

                } });
             AlertDialog alert = alertbox.create();
             alert.show();

             /*Toast.makeText(context, "ALERT: " + intent.getStringExtra("payload"), Toast.LENGTH_LONG).show();*/

        }
}