Android studio错误 - 无法解析：com.google.android.gms：play-services-ads

Question

我在我的android studio项目中发现了一个错误。它显示：

Error:(29, 13) Failed to resolve:com.google.android.gms:play-services-ads:+ Install Repository and sync project

，当我点击安装库和同步项目它显示：

我应该怎么办？

我的XML -

<?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.hanumanbeniwal.www.hanumanbeniwal.MainActivity"> 

    <WebView 
     android:id="@+id/WebView" 
     android:layout_width="fill_parent" 
     android:layout_height="fill_parent"> 

     <com.google.android.gms.ads.AdView 
      android:id="@+id/adView" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_x="586dp" 
      android:layout_y="948dp" /> 
    </WebView> 

</android.support.constraint.ConstraintLayout> 

我的Java编码 -

package com.hanumanbeniwal.www.hanumanbeniwal; 
 

 
import android.support.v7.app.AppCompatActivity; 
 
import android.os.Bundle; 
 
import android.webkit.WebSettings; 
 
import android.webkit.WebView; 
 
import android.webkit.WebViewClient; 
 

 
public class MainActivity extends AppCompatActivity { 
 
    public WebView myWebView; 
 

 
    @Override 
 
    protected void onCreate(Bundle savedInstanceState) { 
 
     super.onCreate(savedInstanceState); 
 
     setContentView(R.layout.activity_main); 
 

 
     myWebView =(WebView)findViewById(R.id.WebView); 
 
     WebSettings webSettings = myWebView.getSettings(); 
 
     webSettings.setJavaScriptEnabled(true); 
 
     webSettings.setAppCacheEnabled(true); 
 
     myWebView.loadUrl("http://www.hanumanbeniwal.com/"); 
 
     myWebView.setWebViewClient(new WebViewClient()); 
 
    } 
 
    @Override 
 
    public void onBackPressed() { 
 
     
 
    } 
 
}

我 build.gradle （项目）请检查一下......

apply plugin: 'com.android.application' 
 

 
android { 
 
    compileSdkVersion 26 
 
    buildToolsVersion "26.0.0" 
 
    defaultConfig { 
 
     applicationId "com.hanumanbeniwal.www.hanumanbeniwal" 
 
     minSdkVersion 14 
 
     targetSdkVersion 26 
 
     versionCode 1 
 
     versionName "1.0" 
 
     testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" 
 
    } 
 
    buildTypes { 
 
     release { 
 
      minifyEnabled false 
 
      proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' 
 
     } 
 
    } 
 
} 
 

 
dependencies { 
 
    compile fileTree(dir: 'libs', include: ['*.jar']) 
 
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', { 
 
     exclude group: 'com.android.support', module: 'support-annotations' 
 
    }) 
 
    compile 'com.android.support:appcompat-v7:26.+' 
 
    compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha7' 
 
    testCompile 'junit:junit:4.12' 
 
    compile 'com.google.android.gms:play-services-ads:+' 
 
}

我 builed.gradle （模块：APP）请检查它......

// Top-level build file where you can add configuration options common to all sub-projects/modules. 
 

 
buildscript { 
 
    repositories { 
 
     jcenter() 
 
    } 
 
    dependencies { 
 
     classpath 'com.android.tools.build:gradle:2.3.3' 
 

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

 
allprojects { 
 
    repositories { 
 
     jcenter() 
 
    } 
 
} 
 

 
task clean(type: Delete) { 
 
    delete rootProject.buildDir 
 
}

Answer 1

必须更新应用级的build.gradle到：

classpath 'com.google.gms:google-services:3.0.0' from 2.x.x.

这可以帮助你。