導入 Walle 時報：ERROR: A problem occurred configuring project ':app'.

導入 walle 報如下錯誤：

org.gradle.api.ProjectConfigurationException: A problem occurred configuring project ':app'.
	at org.gradle.configuration.project.LifecycleProjectEvaluator.wrapException(LifecycleProjectEvaluator.java:79)
	at org.gradle.configuration.project.LifecycleProjectEvaluator.addConfigurationFailure(LifecycleProjectEvaluator.java:72)
	at org.gradle.configuration.project.LifecycleProjectEvaluator.access$600(LifecycleProjectEvaluator.java:53)
	at org.gradle.configuration.project.LifecycleProjectEvaluator$NotifyAfterEvaluate.run(LifecycleProjectEvaluator.java:198)
	at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:402)
	at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:394)
	at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:165)
	at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:250)
	at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:158)
	at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:92)
	at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
	at org.gradle.configuration.project.LifecycleProjectEvaluator$EvaluateProject$1.run(LifecycleProjectEvaluator.java:111)
	at org.gradle.internal.Factories$1.create(Factories.java:25)

解決如下：
點擊三後 新建一個 config，在裏面配置你的 keystore 和 別名 密碼等。最後點擊 ok。
配置完後 在 app 下的 gradle 中會出現如下：

 signingConfigs {
        config {
            storeFile file('C:\\Users\\Administrator\\Desktop\\345\\Project\\CarSteward\\app\\CarSteward.jks')
            storePassword 'nulicarsteward'
            keyAlias = 'CarSteward'
            keyPassword 'nulicarsteward'
        }
    }

接着看一下你的 build.gradle 中有沒有buildTypes{} 這樣的一個閉包。如果有 或者沒有，修改爲如下：

 buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
            signingConfig signingConfigs.config
        }
    }

最主要的就是最後面這就話，也就是我們剛纔配置的 config 。如果沒有這句，則會報 配置 app 項目是出現問題
整個 build.gradle 文件如下：

apply plugin: 'com.android.application'
apply plugin: 'walle'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.2"
    defaultConfig {
        applicationId "com.testdemo.www.myapplication"
        minSdkVersion 14
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }

    signingConfigs {
        config {
            storeFile file('C:\\Users\\Administrator\\Desktop\\345\\Project\\Tinker\\keystore.jks')
            storePassword '123456789'
            keyAlias = 'key0'
            keyPassword '123456789'
        }
    }

    walle {
        // 指定渠道包的輸出路徑
        apkOutputFolder = new File("${project.buildDir}/outputs/channels");
        // 定製渠道包的APK的文件名稱
        apkFileNameFormat = '${appName}-${channel}-${buildType}-v${versionName}-${versionCode}.apk';
        // 渠道配置文件
        channelFile = new File("${project.getProjectDir()}/channel")
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
            signingConfig signingConfigs.config
        }
    }


}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'

    implementation 'com.meituan.android.walle:library:1.1.6'

}