android - Google Cloud Messaging (GCM) - 无法实例化接收器 - java.lang.ClassNotFoundException

Question

一旦应用程序启动或从服务器发送推送通知，就会发生以下回溯。

08-31 02:00:14.733: E/AndroidRuntime(30973): java.lang.RuntimeException: Unable to instantiate receiver com.example.smsmining.GcmBroadcastReceiver: java.lang.ClassNotFoundException: Didn't find class "com.example.smsmining.GcmBroadcastReceiver" on path: DexPathList[[zip file "/data/app/com.example.smsmining-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.example.smsmining-1, /vendor/lib, /system/lib]]
08-31 02:00:14.733: E/AndroidRuntime(30973):    at android.app.ActivityThread.handleReceiver(ActivityThread.java:2405)
08-31 02:00:14.733: E/AndroidRuntime(30973):    at android.app.ActivityThread.access$1500(ActivityThread.java:141)
08-31 02:00:14.733: E/AndroidRuntime(30973):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1332)
08-31 02:00:14.733: E/AndroidRuntime(30973):    at android.os.Handler.dispatchMessage(Handler.java:99)
08-31 02:00:14.733: E/AndroidRuntime(30973):    at android.os.Looper.loop(Looper.java:137)
08-31 02:00:14.733: E/AndroidRuntime(30973):    at android.app.ActivityThread.main(ActivityThread.java:5103)
08-31 02:00:14.733: E/AndroidRuntime(30973):    at java.lang.reflect.Method.invokeNative(Native Method)
08-31 02:00:14.733: E/AndroidRuntime(30973):    at java.lang.reflect.Method.invoke(Method.java:525)
08-31 02:00:14.733: E/AndroidRuntime(30973):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
08-31 02:00:14.733: E/AndroidRuntime(30973):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
08-31 02:00:14.733: E/AndroidRuntime(30973):    at dalvik.system.NativeStart.main(Native Method)
08-31 02:00:14.733: E/AndroidRuntime(30973): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.example.smsmining.GcmBroadcastReceiver" on path: DexPathList[[zip file "/data/app/com.example.smsmining-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.example.smsmining-1, /vendor/lib, /system/lib]]
08-31 02:00:14.733: E/AndroidRuntime(30973):    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:53)
08-31 02:00:14.733: E/AndroidRuntime(30973):    at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
08-31 02:00:14.733: E/AndroidRuntime(30973):    at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
08-31 02:00:14.733: E/AndroidRuntime(30973):    at android.app.ActivityThread.handleReceiver(ActivityThread.java:2400)
08-31 02:00:14.733: E/AndroidRuntime(30973):    ... 10 more

我的 list 文件:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.smsmining"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="9"
        android:targetSdkVersion="16" />
    <uses-permission android:name="android.permission.READ_SMS"/>
    <uses-permission android:name="android.permission.RECEIVE_SMS"/>
    <uses-permission android:name="android.permission.READ_CONTACTS"/>
    <uses-permission android:name="android.permission.INTERNET"/>

    <uses-permission android:name="android.permission.GET_ACCOUNTS" />
    <uses-permission android:name="android.permission.WAKE_LOCK" />


     <permission android:name="com.example.smsmining.permission.C2D_MESSAGE"
        android:protectionLevel="signature" />
    <uses-permission android:name="com.example.smsmining.permission.C2D_MESSAGE" />

    <!-- This app has permission to register and receive data message. -->
    <uses-permission
        android:name="com.google.android.c2dm.permission.RECEIVE" />


    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

         <receiver android:name="com.example.smsmining.SMSBroadcastReceiver">
            <intent-filter>
                <action android:name="android.provider.Telephony.SMS_RECEIVED"/>
            </intent-filter>
        </receiver>



         <receiver
            android:name=".GcmBroadcastReceiver"
            android:permission="com.google.android.c2dm.permission.SEND" >
            <intent-filter>
                <action android:name="com.google.android.c2dm.intent.RECEIVE" />
                <action android:name="com.google.android.c2dm.intent.REGISTRATION" />
                <category android:name="com.example.smsmining" />
            </intent-filter>
        </receiver>
        <service android:name=".GCMIntentService" />

    </application>

</manifest>

GcmBroadcastReceiver.java

package com.example.smsmining;

import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.support.v4.content.WakefulBroadcastReceiver;


/**
 * This {@code WakefulBroadcastReceiver} takes care of creating and managing a
 * partial wake lock for your app. It passes off the work of processing the GCM
 * message to an {@code IntentService}, while ensuring that the device does not
 * go back to sleep in the transition. The {@code IntentService} calls
 * {@code GcmBroadcastReceiver.completeWakefulIntent()} when it is ready to
 * release the wake lock.
 */

public class GcmBroadcastReceiver extends WakefulBroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        // Explicitly specify that GcmIntentService will handle the intent.
        ComponentName comp = new ComponentName(context.getPackageName(),
                GcmIntentService.class.getName());
        // Start the service, keeping the device awake while it is launching.
        startWakefulService(context, (intent.setComponent(comp)));
        setResultCode(Activity.RESULT_OK);
    }
}

GcmIntentService.java

public class GcmIntentService extends IntentService {
    public static final int NOTIFICATION_ID = 1;
    private NotificationManager mNotificationManager;
    NotificationCompat.Builder builder;

    public GcmIntentService() {
        super("GcmIntentService");
    }
    public static final String TAG = "GCM Demo";

    @Override
    protected void onHandleIntent(Intent intent) {
        Bundle extras = intent.getExtras();
        GoogleCloudMessaging gcm = GoogleCloudMessaging.getInstance(this);
        // The getMessageType() intent parameter must be the intent you received
        // in your BroadcastReceiver.
        String messageType = gcm.getMessageType(intent);

        if (!extras.isEmpty()) {  // has effect of unparcelling Bundle
            /*
             * Filter messages based on message type. Since it is likely that GCM will be
             * extended in the future with new message types, just ignore any message types you're
             * not interested in, or that you don't recognize.
             */
            if (GoogleCloudMessaging.MESSAGE_TYPE_SEND_ERROR.equals(messageType)) {
                sendNotification("Send error: " + extras.toString());
            } else if (GoogleCloudMessaging.MESSAGE_TYPE_DELETED.equals(messageType)) {
                sendNotification("Deleted messages on server: " + extras.toString());
            // If it's a regular GCM message, do some work.
            } else if (GoogleCloudMessaging.MESSAGE_TYPE_MESSAGE.equals(messageType)) {
                // This loop represents the service doing some work.
                for (int i = 0; i < 5; i++) {
                    Log.i(TAG, "Working... " + (i + 1)
                            + "/5 @ " + SystemClock.elapsedRealtime());
                    try {
                        Thread.sleep(5);
                    } catch (InterruptedException e) {
                    }
                }
                Log.i(TAG, "Completed work @ " + SystemClock.elapsedRealtime());
                // Post notification of received message.
                sendNotification("Received: " + extras.toString());
                Log.i(TAG, "Received: " + extras.toString());
            }
        }
        // Release the wake lock provided by the WakefulBroadcastReceiver.
        GcmBroadcastReceiver.completeWakefulIntent(intent);
    }

    // Put the message into a notification and post it.
    // This is just one simple example of what you might choose to do with
    // a GCM message.
    private void sendNotification(String msg) {
        mNotificationManager = (NotificationManager)
                this.getSystemService(Context.NOTIFICATION_SERVICE);

        PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
                new Intent(this, MainActivity.class), 0);

        NotificationCompat.Builder mBuilder =
                new NotificationCompat.Builder(this)
        .setSmallIcon(R.drawable.ic_launcher)
        .setContentTitle("GCM Notification")
        .setStyle(new NotificationCompat.BigTextStyle()
        .bigText(msg))
        .setContentText(msg);

        mBuilder.setContentIntent(contentIntent);
        mNotificationManager.notify(NOTIFICATION_ID, mBuilder.build());
    }
}

Answer 1

我遇到了同样的错误。这对我有帮助。尝试检查 v.4 库。Properties->Java Build Path->Order and Export

编辑:选择项目并转到:Properties->Java Build Path->Order and Export，确保在列表中选中了 android.support.v4 库，如果没有，请标记它。 (我假设你已经将库导入项目)，清理项目，它应该可以工作