Question

我想显示我的C2DM消息的有效负载中包含的消息，但我似乎无法在不崩溃的情况下使其工作。

    package com.themenetwork.app;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;

public class C2DMMessageReceiver extends BroadcastReceiver {

    public NotificationManager myNotificationManager;
    public static final int NOTIFICATION_ID = 1;

    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        Log.w("c2dm", "Message Receiver called");
        if ("com.google.android.c2dm.intent.RECEIVE".equals(action)) {
            Log.w("c2dm", "Received message");
            final String payload = intent.getStringExtra("payload");
            Log.d("c2dm", "dmControl: payload = " + payload);

            Notification notification = new Notification(R.drawable.icon, "Hello", 0);
            Intent notificationIntent = new Intent(context, RootActivity.class);
            PendingIntent contentIntent = PendingIntent.getActivity(context, 0, notificationIntent, 0);
            notification.setLatestEventInfo(context, "Title", "Text", contentIntent);
            notification.flags |= Notification.FLAG_ONGOING_EVENT;
            myNotificationManager.notify(NOTIFICATION_ID, notification);

        }
    }
}

例外是......

线程[＆lt; 1＆gt; main]（Suspended（例外RuntimeException））
    ActivityThread.handleReceiver（ActivityThread $ ReceiverData）行：   1881 ActivityThread.access $ 2400（ActivityThread，   ActivityThread $ ReceiverData）line：124
    ActivityThread $ H.handleMessage（消息）行：1018
    ActivityThread $ H（Handler）.dispatchMessage（Message）行：99     Looper.loop（）行：130 ActivityThread.main（String []）行：3806
    Method.invokeNative（Object，Object []，Class，Class []，Class，int，   boolean）line：not available [native method] Method.invoke（Object，   对象...）行：507 ZygoteInit $ MethodAndArgsCaller.run（）行：839
    ZygoteInit.main（String []）行：597 NativeStart.main（String []）   line：not available [native method]

我是Java的新手，更不用说Android了，所以我完全不知道为什么这不起作用。

Answer 1

当您尝试在其上调用myNotificationManager时，notify是否为空？您需要初始化它以指向NotificationManager的有效实例，可能是这样的：

myNotificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);

接收C2DM消息时显示通知会导致崩溃

1 个答案: