相关疑难解决方法(0)

我在Android中使用Firebase云消息传递(FCM)API进行推送通知.当我实施那个时间完美的工作,但现在它找不到谷歌播放的服务.

错误是:

FirebaseInstanceId:后台同步失败:SERVICE_NOT_AVAILABLE,

请帮我解决一下.我在gradle文件中使用了以下依赖项.

dependencies {
    compile files('libs/ksoap2-android-assembly-3.4.0-jar.jar')
    compile 'com.android.support:appcompat-v7:23.0.0'
    compile files('libs/gson-2.2.4.jar')
    compile files('libs/activation.jar')
    compile files('libs/mail.jar')
    compile files('libs/additionnal.jar')
    compile 'com.android.support:multidex:1.0.1'
    compile 'com.facebook.android:facebook-android-sdk:4.14.0'
    compile 'com.google.firebase:firebase-messaging:9.0.2'

    compile('com.google.android.gms:play-services:9.0.2') {
        exclude group: "play-services-wallet"
        exclude module: "play-services-wallet"
        exclude group: "play-services-ads"
        exclude module: "play-services-ads"
    }

}

感谢您抽时间阅读.

我正在进行FCM集成,但得到了java.lang.ClassNotFoundException: Didn't find class "service.MyFirebaseMessagingService" on path: DexPathList[[zip file "/data/app/com.rk.servicepractise-2/base.apk"],nativeLibraryDirectories=[/vendor/lib64, /system/lib64]]

我已经搜索过但没有得到正确的解决方案,请检查下面的代码,让我知道我在哪里做错了？

请检查我classes 和manifest使用文件gradle,请帮我出短距离这个问题.
我的第一个类是MyFirebaseInstanceIDService扩展FirebaseInstanceIdService类

public class MyFirebaseInstanceIDService extends FirebaseInstanceIdService {

    private static final String TAG = "MyFirebaseIIDService";

    @Override
    public void onTokenRefresh() {

        //Getting registration token
        String refreshedToken = FirebaseInstanceId.getInstance().getToken();

        //Displaying token on logcat
        Log.d(TAG, "Refreshed token: " + refreshedToken);

    }

    private void sendRegistrationToServer(String token) {
        //You can implement this method to store the token on your server …