我在我的应用程序中实现了推送通知（GCM）一切都很好，但是，当我卸载应用程序并再次安装它时，向我显示推送通知，其中没有消息。我不知道为什么每次安装应用程序时都会发出推送通知。
以下是我的GCM代码我的问题是“sendNotification（message，”“，”“）;”它显示我的nullpointer异常。
提前谢谢你。
public void onReceive(Context context, Intent intent) {
GoogleCloudMessaging gcm = GoogleCloudMessaging
.getInstance(context);
ctx = context;
String messageType = gcm.getMessageType(intent);
PowerManager pm = (PowerManager) ctx
.getSystemService(Context.POWER_SERVICE);
@SuppressWarnings("deprecation")
PowerManager.WakeLock wl = pm.newWakeLock(
PowerManager.SCREEN_DIM_WAKE_LOCK, "My Tag");
wl.acquire();
if (GoogleCloudMessaging.MESSAGE_TYPE_SEND_ERROR
.equals(messageType)) {
sendNotification(
"Send error: " + intent.getExtras().toString(), "", "");
} else if (GoogleCloudMessaging.MESSAGE_TYPE_DELETED
.equals(messageType)) {
sendNotification("Deleted messages on server: "
+ intent.getExtras().toString(), "", "");
} else {
Bundle extras = intent.getExtras();
String message = extras.getString("message");
System.out.println("message " + message);
Log.i("message", "" + message);
//Do parsing here:
sendNotification(message, "", "");
}
setResultCode(Activity.RESULT_OK);
wl.release();
}
// Put the GCM message into a notification and post it.
private void sendNotification(String msg, String lati, String longi) {
mNotificationManager = (NotificationManager) ctx
.getSystemService(Context.NOTIFICATION_SERVICE);
Intent i = new Intent(ctx, ListViewItems.class);
PendingIntent contentIntent = PendingIntent.getActivity(ctx, 0, i,
0);
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(
ctx).setSmallIcon(R.drawable.smallscreen_logo)
.setContentTitle("Promo Fusion")
// .setStyle(new NotificationCompat.BigTextStyle()
// .bigText(msg));
.setContentText(msg);
mBuilder.setAutoCancel(true);
mBuilder.setContentIntent(contentIntent);
// FOR SOUND..
Uri notification = RingtoneManager
.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
Ringtone r = RingtoneManager.getRingtone(ctx, notification);
r.play();
mNotificationManager.notify(NOTIFICATION_ID, mBuilder.build());
}
}
logcat的：
02-10 21:26:54.910: I/System.out(30141): regid
02-10 21:26:54.918: I/System.out(30141): sender id348234955373
02-10 21:26:55.363: D/OpenGLRenderer(30141): Flushing caches (mode 0)
02-10 21:26:56.472: I/System.out(30141): message null
02-10 21:26:56.472: I/message(30141): null
02-10 21:26:59.332: D/OpenGLRenderer(30141): Flushing caches (mode 0)
02-10 21:26:59.718: D/OpenGLRenderer(30141): Flushing caches (mode 1)
02-10 21:26:59.796: W/IInputConnectionWrapper(30141): showStatusIcon on inactive InputConnection
02-10 21:27:01.882: D/PullToRefresh(30141): Setting Padding. L: 0, T: 0, R: 0, B: 0
02-10 21:27:01.882: D/PullToRefresh(30141): First Visible: 0. Visible Count: 0. Total Items:0
02-10 21:27:01.910: D/AndroidRuntime(30141): Shutting down VM
02-10 21:27:01.910: W/dalvikvm(30141): threadid=1: thread exiting with uncaught exception (group=0x40a421f8)
02-10 21:27:02.043: E/AndroidRuntime(30141): FATAL EXCEPTION: main
02-10 21:27:02.043: E/AndroidRuntime(30141): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.promocloud.promofusion/com.promocloud.promofusion.ListViewItems}: java.lang.NullPointerException: println needs a message
02-10 21:27:02.043: E/AndroidRuntime(30141): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
02-10 21:27:02.043: E/AndroidRuntime(30141): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
02-10 21:27:02.043: E/AndroidRuntime(30141): at android.app.ActivityThread.access$600(ActivityThread.java:123)
02-10 21:27:02.043: E/AndroidRuntime(30141): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
02-10 21:27:02.043: E/AndroidRuntime(30141): at android.os.Handler.dispatchMessage(Handler.java:99)
02-10 21:27:02.043: E/AndroidRuntime(30141): at android.os.Looper.loop(Looper.java:137)
02-10 21:27:02.043: E/AndroidRuntime(30141): at android.app.ActivityThread.main(ActivityThread.java:4424)
02-10 21:27:02.043: E/AndroidRuntime(30141): at java.lang.reflect.Method.invokeNative(Native Method)
02-10 21:27:02.043: E/AndroidRuntime(30141): at java.lang.reflect.Method.invoke(Method.java:511)
02-10 21:27:02.043: E/AndroidRuntime(30141): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
02-10 21:27:02.043: E/AndroidRuntime(30141): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
02-10 21:27:02.043: E/AndroidRuntime(30141): at dalvik.system.NativeStart.main(Native Method)
02-10 21:27:02.043: E/AndroidRuntime(30141): Caused by: java.lang.NullPointerException: println needs a message
02-10 21:27:02.043: E/AndroidRuntime(30141): at android.util.Log.println_native(Native Method)
02-10 21:27:02.043: E/AndroidRuntime(30141): at android.util.Log.d(Log.java:138)
02-10 21:27:02.043: E/AndroidRuntime(30141): at com.promocloud.promofusion.ListViewItems.onCreate(ListViewItems.java:140)
02-10 21:27:02.043: E/AndroidRuntime(30141): at android.app.Activity.performCreate(Activity.java:4465)
02-10 21:27:02.043: E/AndroidRuntime(30141): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
02-10 21:27:02.043: E/AndroidRuntime(30141): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
02-10 21:27:02.043: E/AndroidRuntime(30141): ... 11 more