当我试图将应用程序设备注册到服务器时,我会收到以下错误:我已经像导入应用程序一样导入了gogole-play-services_lib,并在Properties->Android->Add 的应用程序中添加了这个库
12-10 16:00:03.026: E/AndroidRuntime(29362): FATAL EXCEPTION: AsyncTask #1
12-10 16:00:03.026: E/AndroidRuntime(29362): Process: com.appehour.jdm, PID: 29362
12-10 16:00:03.026: E/AndroidRuntime(29362): java.lang.RuntimeException: An error occured while executing doInBackground()
12-10 16:00:03.026: E/AndroidRuntime(29362): at android.os.AsyncTask$3.done(AsyncTask.java:300)
12-10 16:00:03.026: E/AndroidRuntime(29362): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
12-10 16:00:03.026: E/AndroidRuntime(29362): at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
12-10 16:00:03.026: E/AndroidRuntime(29362): at java.util.concurrent.FutureTask.run(FutureTask.java:242)
12-10 16:00:03.026: E/AndroidRuntime(29362): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
12-10 16:00:03.026: E/AndroidRuntime(29362): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
12-10 16:00:03.026: E/AndroidRuntime(29362): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
12-10 16:00:03.026: E/AndroidRuntime(29362): at java.lang.Thread.run(Thread.java:841)
12-10 16:00:03.026: E/AndroidRuntime(29362): Caused by: java.lang.NullPointerException
12-10 16:00:03.026: E/AndroidRuntime(29362): at android.app.PendingIntent.getBroadcastAsUser(PendingIntent.java:478)
12-10 16:00:03.026: E/AndroidRuntime(29362): at android.app.PendingIntent.getBroadcast(PendingIntent.java:467)
12-10 16:00:03.026: E/AndroidRuntime(29362): at com.google.android.gms.gcm.GoogleCloudMessaging.d(Unknown Source)
12-10 16:00:03.026: E/AndroidRuntime(29362): at com.google.android.gms.gcm.GoogleCloudMessaging.b(Unknown Source)
12-10 16:00:03.026: E/AndroidRuntime(29362): at com.google.android.gms.gcm.GoogleCloudMessaging.register(Unknown Source)
12-10 16:00:03.026: E/AndroidRuntime(29362): at com.appehour.jdm.TestPush$registerInBackground.doInBackground(TestPush.java:172)
12-10 16:00:03.026: E/AndroidRuntime(29362): at com.appehour.jdm.TestPush$registerInBackground.doInBackground(TestPush.java:1)
12-10 16:00:03.026: E/AndroidRuntime(29362): at android.os.AsyncTask$2.call(AsyncTask.java:288)
12-10 16:00:03.026: E/AndroidRuntime(29362): at java.util.concurrent.FutureTask.run(FutureTask.java:237)
12-10 16:00:03.026: E/AndroidRuntime(29362): ... 4 more
这是我在后台的代码:
@Override
protected String doInBackground(String... params) {
String msg = "";
try {
if (gcm == null) {
gcm = GoogleCloudMessaging.getInstance(context);
}
regid = gcm.register(SENDER_ID);
msg = "Device registered, registration ID=" + regid;
Log.d(TAG_LOGS, "Device registered, registration ID=" + regid);
// You should send the registration ID to your server over HTTP,
// so it can use GCM/HTTP or CCS to send messages to your app.
// The request to your server should be authenticated if your app
// is using accounts.
sendRegistrationIdToBackend();
// For this demo: we don't need to send it because the device
// will send upstream messages to a server that echo back the
// message using the 'from' address in the message.
// Persist the regID - no need to register again.
storeRegistrationId(context, regid);
} catch (IOException ex) {
msg = "Error :" + ex.getMessage();
Log.e(TAG_LOGS, "Error :" + ex.getMessage());
// If there is an error, don't just keep trying to register.
// Require the user to click a button again, or perform
// exponential back-off.
}
return msg;
}
}
我不知道该如何解决。谢谢你。
这个非常棘手。验证
GoogleCloudMessaging.getInstance(context);
没有使用null上下文运行。这就是我的情况,我得到了你描述的错误。在我修复了上下文(我忘记了助手类构造函数中的mContext=ctx)之后,错误消失了。
发生此错误的另一种情况是设备上未安装google play服务。例如,在genymotion VD和cyanogenmod(未安装谷歌应用程序)设备上。
我有:
gcm = GoogleCloudMessaging.getInstance(this);
替换为:
gcm = GoogleCloudMessaging.getInstance(getApplicationContext());
这就解决了问题。