无法解析符号 'Theme.Material3.Light.NoActionBar' (Android Studio)

Question

我使用 Android Studio Arctic Fox 创建了一个新的 Android 项目 | 2020.3.1 补丁 3，我的目标是简单地自定义我的应用程序以使用 Material3 主题

错误发生在 values\themes。xml 说 Cannot resolve symbol 'Theme.Material3.Light.NoActionBar'

我在Migrating from M2 to M3 (MDC 1.4.0 to MDC 1.5.0)[=22]部分下发现了一个类似的问题 but 'Theme.MaterialComponents.Light.NoActionBar' was my default theme when i created the project and it had no errors, the error started when i changed to use Theme.Material3.Light.NoActionBar as per this article on Migrating to Material Design 3 =]

我已经尝试使用 gradle 个文件同步项目，使缓存无效/重新启动..但我仍然遇到相同的错误

我已经使用 Material Theme builder 生成了我的 themes.xml 和 colors.xml，下面是我的文件

themes.xml

<resources>
    <style name="Theme.App" parent="Theme.Material3.Light.NoActionBar">
        <item name="colorPrimary">@color/md_theme_light_primary</item>
        <item name="colorOnPrimary">@color/md_theme_light_onPrimary</item>
        <item name="colorPrimaryContainer">@color/md_theme_light_primaryContainer</item>
        <item name="colorOnPrimaryContainer">@color/md_theme_light_onPrimaryContainer</item>
        <item name="colorSecondary">@color/md_theme_light_secondary</item>
        <item name="colorOnSecondary">@color/md_theme_light_onSecondary</item>
        <item name="colorSecondaryContainer">@color/md_theme_light_secondaryContainer</item>
        <item name="colorOnSecondaryContainer">@color/md_theme_light_onSecondaryContainer</item>
        <item name="colorTertiary">@color/md_theme_light_tertiary</item>
        <item name="colorOnTertiary">@color/md_theme_light_onTertiary</item>
        <item name="colorTertiaryContainer">@color/md_theme_light_tertiaryContainer</item>
        <item name="colorOnTertiaryContainer">@color/md_theme_light_onTertiaryContainer</item>
        <item name="colorError">@color/md_theme_light_error</item>
        <item name="colorErrorContainer">@color/md_theme_light_errorContainer</item>
        <item name="colorOnError">@color/md_theme_light_onError</item>
        <item name="colorOnErrorContainer">@color/md_theme_light_onErrorContainer</item>
        <item name="android:colorBackground">@color/md_theme_light_background</item>
        <item name="colorOnBackground">@color/md_theme_light_onBackground</item>
        <item name="colorSurface">@color/md_theme_light_surface</item>
        <item name="colorOnSurface">@color/md_theme_light_onSurface</item>
        <item name="colorSurfaceVariant">@color/md_theme_light_surfaceVariant</item>
        <item name="colorOnSurfaceVariant">@color/md_theme_light_onSurfaceVariant</item>
        <item name="colorOutline">@color/md_theme_light_outline</item>
        <item name="colorOnSurfaceInverse">@color/md_theme_light_inverseOnSurface</item>
        <item name="colorSurfaceInverse">@color/md_theme_light_inverseSurface</item>
        <item name="colorPrimaryInverse">@color/md_theme_light_primaryInverse</item>
    </style>
</resources>

build.gradle（应用程序）

plugins {
    id 'com.android.application'
}

android {
    compileSdk 31

    defaultConfig {
        applicationId "com.blablabla"
        minSdk 21
        targetSdk 31
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    buildToolsVersion '32.0.0 rc1'
}

dependencies {
    implementation 'androidx.compose.material3:material3:1.0.0-alpha02'
    implementation 'androidx.appcompat:appcompat:1.4.0'
    implementation 'com.google.android.material:material:1.4.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.2'
    testImplementation 'junit:junit:'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
}

buid.gradle（项目）

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    repositories {
        google()
        mavenCentral()
    }
    dependencies {
        classpath "com.android.tools.build:gradle:7.0.4"

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

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

Answer 1

您必须在 gradle 文件中更改 material 设计的依赖项。

Note: In order to use the new Material3 themes and component styles, you must depend on version 1.5.0-alpha04 or later.

Getting started with MDC android

访问 Google's Maven Repository or MVN Repository 查找最新版本的库。

Answer 2

您必须使用 material 依赖项的 alpha 版本

Alpha 版本 - 这是您正在开发的功能未完成或部分完成时的版本。

更新您的 material 依赖项

implementation 'com.google.android.material:material:1.4.0'

至

implementation 'com.google.android.material:material:1.6.0-alpha01'

无法解析符号 'Theme.Material3.Light.NoActionBar' (Android Studio)

Cannot resolve symbol 'Theme.Material3.Light.NoActionBar' (Android Studio)

android

material-design

material-components-android