Nhắn tin qua đám mây của Google (GCM) - không thể khởi tạo bộ thu - java.lang.ClassNotFoundException

Question

Ngay khi ứng dụng bắt đầu hoặc khi thông báo đẩy được gửi từ máy chủ, truy xuất sau sẽ xảy ra.

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 

tập tin Manifest của tôi:

<?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

Tôi đã có những sai lầm tương tự. Điều này đã giúp tôi. Hãy thử kiểm tra thư viện v.4. Properties-> Java Build Path-> Trình tự, xuất khẩu

được sửa đổi: Chọn dự án và đi đến: Properties-> Java Build Path-> Trình tự, xuất khẩu, đảm bảo android.support.v4 thư viện được kiểm tra trong danh sách, nếu không, đánh dấu nó. (I giả sử bạn đã nhập khẩu các thư viện để dự án), dự án sạch và nó cũng làm việc

Answer 2

thay đổi

.GcmBroadcastReceiver 

để

com.example.smsmining.GcmBroadcastReceiver 

và

.GCMIntentService 

để

com.example.smsmining.GCMIntentService 

Sau đó, làm sạch dự án. Điều đó phù hợp với tôi.