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我正在使用 Android Studio 3.1.3。Gradle 构建同步失败。我使用了以下方法，但没有使用它。如果有任何解决方案请告诉我

1. maven { url "https://maven.google.com" }

2. 使重启和缓存无效

3. multiDexEnabled true

4. 添加mavenLocal()和mavenCentral()

   这是模块级build.gradle文件：

   android {
           compileSdkVersion 27
           defaultConfig {
               applicationId "com.developers.a_g.designapp"
               minSdkVersion 15
               targetSdkVersion 27
               buildToolsVersion '27.1.1'
               versionCode 1
               versionName "1.0"
               multiDexEnabled true
               testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
           }
           buildTypes {
               release {
                   minifyEnabled false
                   proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
               }
           }
       }
   
   dependencies {
       implementation fileTree( dir: 'libs',include: ['*.jar'])
       implementation 'com.android.support:appcompat-v7:27.1.1'
       implementation 'com.android.support.constraint:constraint-layout:1.1.2'
       testImplementation 'junit:junit:4.12'
       androidTestImplementation 'com.android.support.test:runner:1.0.2'
       androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
       implementation 'com.android.support:cardview-v7:27.1.1'
       implementation 'com.android.support:design-v7:27.1.1'
       implementation 'com.rengwuxian.materialedittext:library:2.1.4'
       implementation 'com.szagurskii:patternedtextwatcher:0.5.0' …

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