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我已经添加了grandle文件：

 compile 'com.google.android.gms:play-services-ads:10.2.4'

在我的 XML 中：

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.newtimebox.tictactoe.activities.MainActivity"
android:id="@+id/mainlayout"
android:background="@drawable/menu_back">
<com.google.android.gms.ads.AdView
    xmlns:ads="http://schemas.android.com/apk/res-auto"
    android:id="@+id/adView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_alignParentBottom="true"
    ads:adSize="BANNER"
    ads:adUnitId="ca-app-pub-3940256099942544/6300978111">
</com.google.android.gms.ads.AdView></android.support.constraint.ConstraintLayout>

它说无法实例化一个或多个类并且无法实例化以下类 com.google.android.gms.ads.AdView (Open Class , Show Exception, Clear Cache)

我尝试了许多解决方案，例如 Invalidate Cache ，所有这些com.google.ads.AdView 都无法实例化

日志猫

07-06 17:07:00.802 13584-13598/? V/ViewRootImpl: Contents drawing finished : Application Error: com.newtimebox.tictactoe 07-06 17:07:00.862 24372-24409/? E/wget http://127.0.0.1:6880/callback.json: java.net.ConnectException: failed to connect to /127.0.0.1 (port 6880) after 30000ms: isConnected failed: ECONNREFUSED (Connection refused) (4ms) 07-06 17:07:00.862 24372-24409/? I/wget http://127.0.0.1:6880/callback.json: RETRY (15/200) in 100ms 07-06 17:07:00.999 24372-24409/? E/wget http://127.0.0.1:6880/callback.json: java.net.ConnectException: failed to connect to /127.0.0.1 (port 6880) after 30000ms: isConnected failed: ECONNREFUSED (Connection refused) (4ms) 07-06 17:07:01.000 24372-24409/? I/wget http://127.0.0.1:6880/callback.json: RETRY (16/200) in 100ms

为什么在整个互联网上没有解决方案？

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