当我将Target从28降低到27时，为什么会出现"Android资源链接失败“错误？

Question

我正在使用Whatsapp贴纸源代码来构建我自己的贴纸应用程序。当我用Target版本28或29构建这个项目时，它编译得完美无缺，但是当我将Target版本降低到27时，它**无法链接资源。**我希望这段代码也能在Android设备上运行。

值得注意的是，Whatsapp最近将它们的代码迁移到了Androidx。

Build.gradle:

apply plugin: 'com.android.application'

android {
    //the compression of webp file during build causes problem with FileDescriptor in ContentProvider.
    aaptOptions {
        noCompress "webp"
    }
    compileSdkVersion 27
    defaultConfig {
        applicationId 'com.sticker.app'
        minSdkVersion 15
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        def contentProviderAuthority = applicationId + ".stickercontentprovider"
        // Creates a placeholder property to use in the manifest.
        manifestPlaceholders =
                [contentProviderAuthority: contentProviderAuthority]
        // Adds a new field for the authority to the BuildConfig class.
        buildConfigField("String",
                "CONTENT_PROVIDER_AUTHORITY",
                "\"${contentProviderAuthority}\"")
    }
    buildTypes {
        debug {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility = '1.8'
        targetCompatibility = '1.8'
    }

    packagingOptions {
        exclude 'lib/*/libnative-imagetranscoder.so'
        exclude 'lib/*/libnative-filters.so'
    }

    // Configures multiple APKs based on ABI.
    // see https://developer.android.com/studio/build/configure-apk-splits#configure-abi-split
//    splits {
//        abi {
//            enable true // Enables building multiple APKs per ABI.
//            universalApk true // Specifies that we do not want to also generate a universal APK that includes all ABIs.
//        }
//    }
}

task checkDebug {
    doLast {
        println("checkDebug")
        if (android.defaultConfig.applicationId.startsWith("com.whatsapp")) {
            throw new GradleException("applicationId in defaultConfig cannot start with com.whatsapp, please change your applicationId in app/build.gradle")
        }
        checkApplicationIdInDebug()
    }
}

private void checkApplicationIdInDebug() {
    Properties properties = new Properties()
    properties.load(project.rootProject.file('local.properties').newDataInputStream())
    def ignoreApplicationIdCheck = properties.getProperty('ignoreApplicationIdCheck')
    if (ignoreApplicationIdCheck == null) {
        if (android.defaultConfig.applicationId == "com.example.samplestickerapp") {
            throw new GradleException("Your applicationId is currently com.example.samplestickerapp, please change your applicationId to a different string in app/build.gradle in line 10")
        }
    } else {
        println("application id check ignored")
    }
}


task checkRelease {
    doLast {
        println("checkRelease")
        if (android.defaultConfig.applicationId.startsWith("com.example")) {
            throw new GradleException("applicationId in defaultConfig cannot start with com.example, please change your applicationId in app/build.gradle")
        }
    }
}

tasks.whenTaskAdded { task ->
    println(task.name)
    if (task.name.contains("assembleDebug")) {
        task.dependsOn checkDebug
    }
    if (task.name.contains("assembleRelease")) {
        task.dependsOn checkRelease
    }
}

Build.gradle依赖项：

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'com.google.android.material:material:1.0.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.2.0'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
    implementation 'androidx.recyclerview:recyclerview:1.0.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'com.facebook.fresco:fresco:2.0.0'
    implementation 'com.facebook.fresco:webpsupport:2.0.0'
    implementation 'com.facebook.fresco:animated-webp:2.0.0'
    implementation 'com.facebook.fresco:animated-base:2.0.0'
}

我已经搜索了降低Androidx项目上的Target的方法，但是还没有找到任何方法。

错误：

> Task :app:processDebugResources FAILED
AGPBI: {"kind":"error","text":"Android resource linking failed","sources":[{"file":"C:\\Users\\vivek\\.gradle\\caches\\transforms-2\\files-2.1\\37ec02f661e3547c5499ecdfd9f3cd1f\\appcompat-1.1.0\\res\\values-v28\\values-v28.xml","position":{"startLine":4,"startColumn":4,"startOffset":217,"endLine":7,"endColumn":12,"endOffset":442}}],"original":"C:\\Users\\vivek\\.gradle\\caches\\transforms-2\\files-2.1\\37ec02f661e3547c5499ecdfd9f3cd1f\\appcompat-1.1.0\\res\\values-v28\\values-v28.xml:5:5-8:13: AAPT: error: resource android:attr/dialogCornerRadius not found.\n    ","tool":"AAPT"}
AGPBI: {"kind":"error","text":"Android resource linking failed","sources":[{"file":"C:\\Users\\vivek\\.gradle\\caches\\transforms-2\\files-2.1\\37ec02f661e3547c5499ecdfd9f3cd1f\\appcompat-1.1.0\\res\\values-v28\\values-v28.xml","position":{"startLine":8,"startColumn":4,"startOffset":447,"endLine":11,"endColumn":12,"endOffset":684}}],"original":"C:\\Users\\vivek\\.gradle\\caches\\transforms-2\\files-2.1\\37ec02f661e3547c5499ecdfd9f3cd1f\\appcompat-1.1.0\\res\\values-v28\\values-v28.xml:9:5-12:13: AAPT: error: resource android:attr/dialogCornerRadius not found.\n    ","tool":"AAPT"}
AGPBI: {"kind":"error","text":"Android resource linking failed","sources":[{"file":"C:\\Users\\vivek\\.gradle\\caches\\transforms-2\\files-2.1\\c527b78844be871c44103f6f45a963fb\\core-1.1.0\\res\\values\\values.xml","position":{"startLine":141,"startColumn":4,"startOffset":8780,"endLine":172,"endColumn":24,"endOffset":10840}}],"original":"C:\\Users\\vivek\\.gradle\\caches\\transforms-2\\files-2.1\\c527b78844be871c44103f6f45a963fb\\core-1.1.0\\res\\values\\values.xml:142:5-173:25: AAPT: error: resource android:attr/fontVariationSettings not found.\n    ","tool":"AAPT"}
AGPBI: {"kind":"error","text":"Android resource linking failed","sources":[{"file":"C:\\Users\\vivek\\.gradle\\caches\\transforms-2\\files-2.1\\c527b78844be871c44103f6f45a963fb\\core-1.1.0\\res\\values\\values.xml","position":{"startLine":141,"startColumn":4,"startOffset":8780,"endLine":172,"endColumn":24,"endOffset":10840}}],"original":"C:\\Users\\vivek\\.gradle\\caches\\transforms-2\\files-2.1\\c527b78844be871c44103f6f45a963fb\\core-1.1.0\\res\\values\\values.xml:142:5-173:25: AAPT: error: resource android:attr/ttcIndex not found.\n    ","tool":"AAPT"}
AGPBI: {"kind":"error","text":"Android resource linking failed","sources":[{"file":"C:\\Users\\vivek\\.gradle\\caches\\transforms-2\\files-2.1\\37ec02f661e3547c5499ecdfd9f3cd1f\\appcompat-1.1.0\\res\\values\\values.xml","position":{"startLine":2771,"startColumn":4,"startOffset":173278,"endLine":2794,"endColumn":24,"endOffset":174475}}],"original":"C:\\Users\\vivek\\.gradle\\caches\\transforms-2\\files-2.1\\37ec02f661e3547c5499ecdfd9f3cd1f\\appcompat-1.1.0\\res\\values\\values.xml:2772:5-2795:25: AAPT: error: resource android:attr/textFontWeight not found.\n    ","tool":"AAPT"}

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:processDebugResources'.
> A failure occurred while executing com.android.build.gradle.internal.tasks.Workers$ActionFacade
   > Android resource linking failed
     C:\Users\vivek\.gradle\caches\transforms-2\files-2.1\37ec02f661e3547c5499ecdfd9f3cd1f\appcompat-1.1.0\res\values-v28\values-v28.xml:5:5-8:13: AAPT: error: resource android:attr/dialogCornerRadius not found.

     C:\Users\vivek\.gradle\caches\transforms-2\files-2.1\37ec02f661e3547c5499ecdfd9f3cd1f\appcompat-1.1.0\res\values-v28\values-v28.xml:9:5-12:13: AAPT: error: resource android:attr/dialogCornerRadius not found.

     C:\Users\vivek\.gradle\caches\transforms-2\files-2.1\c527b78844be871c44103f6f45a963fb\core-1.1.0\res\values\values.xml:142:5-173:25: AAPT: error: resource android:attr/fontVariationSettings not found.

     C:\Users\vivek\.gradle\caches\transforms-2\files-2.1\c527b78844be871c44103f6f45a963fb\core-1.1.0\res\values\values.xml:142:5-173:25: AAPT: error: resource android:attr/ttcIndex not found.

     C:\Users\vivek\.gradle\caches\transforms-2\files-2.1\37ec02f661e3547c5499ecdfd9f3cd1f\appcompat-1.1.0\res\values\values.xml:2772:5-2795:25: AAPT: error: resource android:attr/textFontWeight not found.

Answer 1

要使用androidx库，必须使用

compileSdkVersion 28

或者更高。

您可以检查官方医生

如果您想使用AndroidX in一个新项目，则需要将编译SDK设置为Android9.0 (API级别28)或更高级别的，并在gradle.properties文件中将以下两个安卓Gradle插件标记设置为true。 android.useAndroidX：当设置为true时，AndroidX使用适当的AndroidX库而不是支持库。默认情况下，如果未指定标志，则为false。 android.enableJetifier：当设置为true时，Android插件通过重写二进制文件自动迁移现有的第三方库以使用AndroidX。默认情况下，如果未指定标志，则为false。

Answer 2

您的应用程序将在任何至少运行API级别为15的设备上工作。它由这条minSdkVersion = 15行定义。您仍然可以无问题地使用AndroidX依赖项。所以试着让targetSdkVersion保持最新。在您的情况下，您可以简单地保持它的原样，不需要降低它。同样，您希望运行的应用程序的最低API级别是由minSdkVersion而不是targetSdkVersion.定义的。

编辑

要使用AndroidX，需要将编译版本设置为至少compileSdkVersion = 28。在你的例子中，它是27。还将这两行添加到您的gradle.properties文件中：

android.useAndroidX = true
android.enableJetifier = true // This will ensure that third-party libraries will be migrated to AndroidX