04-12 14:56:38.897: E/AndroidRuntime(1181): java.lang.RuntimeException: An error occured while executing doInBackground()
04-12 14:56:38.897: E/AndroidRuntime(1181): at android.os.AsyncTask$3.done(AsyncTask.java:300)
04-12 14:56:38.897: E/AndroidRuntime(1181): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
04-12 14:56:38.897: E/AndroidRuntime(1181): at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
04-12 14:56:38.897: E/AndroidRuntime(1181): at java.util.concurrent.FutureTask.run(FutureTask.java:242)
04-12 14:56:38.897: E/AndroidRuntime(1181): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
04-12 14:56:38.897: E/AndroidRuntime(1181): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
04-12 14:56:38.897: E/AndroidRuntime(1181): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
04-12 14:56:38.897: E/AndroidRuntime(1181): at java.lang.Thread.run(Thread.java:841)
04-12 14:56:38.897: E/AndroidRuntime(1181): Caused by: java.lang.NullPointerException
04-12 14:56:38.897: E/AndroidRuntime(1181): at com.google.android.gms.gcm.GoogleCloudMessaging.register(Unknown Source)
04-12 14:56:38.897: E/AndroidRuntime(1181): at com.example.gcm.GcmUtil$1.doInBackground(GcmUtil.java:142)
04-12 14:56:38.897: E/AndroidRuntime(1181): at com.example.gcm.GcmUtil$1.doInBackground(GcmUtil.java:1)
04-12 14:56:38.897: E/AndroidRuntime(1181): at android.os.AsyncTask$2.call(AsyncTask.java:288)
04-12 14:56:38.897: E/AndroidRuntime(1181): at java.util.concurrent.FutureTask.run(FutureTask.java:237)
04-12 14:56:38.897: E/AndroidRuntime(1181): ... 4 more
代码是：
private void registerBackground() {
registrationTask = new AsyncTask<Void, Void, Boolean>() {
@Override
protected Boolean doInBackground(Void... params) {
long backoff = BACKOFF_MILLI_SECONDS + random.nextInt(1000);
for (int i = 1; i <= MAX_ATTEMPTS; i++) {
//Log.d(TAG, "Attempt #" + i + " to register");
try {
if (gcm == null) {
gcm = GoogleCloudMessaging.getInstance(ctx);
}
String regid = gcm.register(Common.getSenderId());
ServerUtilities.register(Common.getPreferredEmail(),
regid);
// Save the regid - no need to register again.
setRegistrationId(regid);
return Boolean.TRUE;
} catch (IOException ex) {
//Log.e(TAG, "Failed to register on attempt " + i + ":"
+ ex);
if (i == MAX_ATTEMPTS) {
break;
}
try {
//Log.d(TAG, "Sleeping for " + backoff + " ms before
retry");
Thread.sleep(backoff);
} catch (InterruptedException e1) {
// Activity finished before we complete - exit.
//Log.d(TAG, "Thread interrupted: abort remaining
retries!");
Thread.currentThread().interrupt();
}
// increase backoff exponentially
backoff *= 2;
}
}
return Boolean.FALSE;
}
注意：我注意到在gcm.register注册时有一条水平线...当我将鼠标悬停在它上面时，它表示@RequiresPermission（值=＆＃34; com.google.android.c2dm.permission.RECEIVE＆＃34; ） @deprecated
我已经提到了android清单中的权限，但仍然没有消失。
Android Manifest：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.heylo"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="15" />
<permission
android:name="com.example.heylo.permission.C2D_MESSAGE"
android:protectionLevel="signature" />
<uses-permission android:name="com.example.heylo.permission.C2D_MESSAGE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" >
</uses-permission>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" >
</uses-permission>
<uses-permission android:name="android.permission.WAKE_LOCK" >
</uses-permission>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" >
</uses-permission>
<uses-permission android:name="com.google.android.c2dm.permission.RECEIVE"/>
<application
android:name="com.example.heylo.Common"
android:allowBackup="true"
android:icon="@drawable/ic_splash"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
</activity>
<activity android:name=".SplashScreen" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver
android:name="com.example.gcm.GcmBroadcastReceiver"
android:permission="com.google.android.c2dm.permission.SEND" >
<intent-filter>
<action android:name="com.google.android.c2dm.intent.RECEIVE" />
<category android:name="com.example.heylo" />
</intent-filter>
</receiver>
<provider
android:name="com.example.heylo.DataProvider"
android:authorities="com.example.heylo.provider"
android:exported="false" >
</provider>
<activity
android:name=".Message_List"
android:label="@string/title_activity_message__list" >
</activity>
<activity
android:name=".SettingsActivity"
android:label="@string/title_activity_settings" >
</activity>
</application>
</manifest>