因此，我昨天在Android
Studio中遇到了一个我从未见过的错误，这是由过去三个月未触及的一段代码引起的。这来自用于注册推送通知的代码，本周初工作正常，但现在导致此错误：

05-20 10:37:02.064 22471-22681/com.appname E/AndroidRuntime: FATAL EXCEPTION: IntentService[RegIntentService]
                                                               Process: com.appname,PID: 22471
                                                               java.lang.IncompatibleClassChangeError: The method 'java.io.File android.support.v4.content.ContextCompat.getNoBackupFilesDir(android.content.Context)' was expected to be of type virtual but instead was found to be of type direct (declaration of 'java.lang.reflect.ArtMethod' appears in /system/framework/core-libart.jar)
                                                                   at com.google.android.gms.iid.zzd.zzeb(Unknown Source)
                                                                   at com.google.android.gms.iid.zzd.<init>(Unknown Source)
                                                                   at com.google.android.gms.iid.zzd.<init>(Unknown Source)
                                                                   at com.google.android.gms.iid.InstanceID.zza(Unknown Source)
                                                                   at com.google.android.gms.iid.InstanceID.getInstance(Unknown Source)
                                                                   at com.appname.services.RegistrationIntentService.onHandleIntent(RegistrationIntentService.java:32)
                                                                   at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:65)
                                                                   at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                   at android.os.Looper.loop(Looper.java:135)
                                                                   at android.os.HandlerThread.run(HandlerThread.java:61)

这是我的RegistrationIntentService类：

package com.appname.services;

import android.app.IntentService;
import android.content.Context;
import android.content.Intent;
import com.google.android.gms.gcm.GoogleCloudMessaging;
import com.google.android.gms.iid.InstanceID;
import com.appname.MainSharedPreferences;
import com.appname.R;
import java.io.IOException;

public class RegistrationIntentService extends IntentService {

    private static final String TAG = "RegIntentService";

    public RegistrationIntentService() {
        super(TAG);
    }
    public static void startService(final Context context) {
        final Intent intent = new Intent(context,RegistrationIntentService.class);
        context.startService(intent); //HERE is the line that is causing the crash
    }

    @Override
    public void onHandleIntent(Intent intent) {
        InstanceID instanceID = InstanceID.getInstance(this);
        try {
            String token = instanceID.getToken(getString(R.string.gcm_defaultSenderId),GoogleCloudMessaging.INSTANCE_ID_SCOPE,null);
            MainSharedPreferences.saveGCMInstanceToken(token,getApplicationContext());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

这是从我的MainActivity类调用上面的类的代码行：

RegistrationIntentService.startService(getApplicationContext());

我的MainActivity上的一些信息是否有帮助…

public class MainActivity extends SocialActivity implements SeekBar.OnSeekBarChangeListener

public abstract class SocialActivity extends AppCompatActivity implements GraphRequest.GraphJSONObjectCallback

我尝试跳回几个较早的提交，但是遇到了相同的错误。这使我相信，Android
Studio或Java版本可能存在问题。我更新了Java版本并重新安装了Android
Studio，但仍然是相同的错误。在具有旧版本的单独计算机上也尝试过，仍然存在相同的错误。

我什至尝试根据此指南从GCM迁移到Firebase ，最终再次遇到相同的错误。

我可以注释掉使应用程序崩溃的行，它将正常运行，但随后我不再收到通知。

在此问题上的任何帮助或建议，将不胜感激！

编辑： 这也是我相关的编译/类路径语句…

在appname build.gradle中：

buildscript {
    repositories {
        jcenter()
    }
    repositories { mavenCentral() }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.1.0'
        classpath 'com.google.gms:google-services:3.0.0'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

在应用程序build.gradle中：

apply plugin: 'com.android.application'
apply plugin: 'io.fabric'

repositories {
    //...
}

allprojects {
    //...
}

android {
   //...
}

dependencies {
    compile fileTree(dir: 'libs',include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.4.0'
    compile 'com.google.code.gson:gson:2.5'
    compile 'com.android.support:design:23.4.0'
    compile 'com.android.support:recyclerview-v7:+'
    compile "com.google.firebase:firebase-messaging:9.0.0"
    //...
}

apply plugin: 'com.google.gms.google-services'