尝试将 Firebase 依赖项添加到 Qt 项目时生成错误

Question

我想使用Firebase，就像在任何原生Android应用程序中一样，不使用Qt（即使用Java）。我已经有了一个（一切正常）。

现在我正在尝试将 Firebase 添加到我现有的 Qt 项目中。现在，我正在尝试将所有必需的依赖项添加到build.gradle（这样我就可以在我的Qt 项目的Java 源代码部分中使用Firebase APIs），并出现奇怪的错误。

我不擅长Gradle，所以感谢任何帮助（如果可能的话，因为我使用的是很旧的Qt 5.12.12）。

这是我的build.gradle（构建和运行良好）：

buildscript {
    repositories {
        google()
        jcenter()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:3.2.0'
    }
}

repositories {
    google()
    jcenter()
}

apply plugin: 'com.android.application'

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar', '*.aar'])
    implementation 'androidx.appcompat:appcompat:1.0.2'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'androidx.swiperefreshlayout:swiperefreshlayout:1.1.0'
    implementation 'com.google.code.gson:gson:2.7'
    implementation 'com.jakewharton:process-phoenix:2.1.2' // https://github.com/JakeWharton/ProcessPhoenix
    implementation 'me.dm7.barcodescanner:zxing:1.9.13' // https://github.com/dm77/barcodescanner
}

android {
    /*******************************************************
     * The following variables:
     * - androidBuildToolsVersion,
     * - androidCompileSdkVersion
     * - qt5AndroidDir - holds the path to qt android files
     *                   needed to build any Qt application
     *                   on Android.
     *
     * are defined in gradle.properties file. This file is
     * updated by QtCreator and androiddeployqt tools.
     * Changing them manually might break the compilation!
     *******************************************************/

    // Buggy thing: fails to build. Needs to be replaced with actual numbers.
    // https://stackoverflow.com/a/46290586/3765267
    /*compileSdkVersion androidCompileSdkVersion.toInteger()
    buildToolsVersion androidBuildToolsVersion*/
    compileSdkVersion 30
    buildToolsVersion "30.0.2"

    sourceSets {
        main {
            manifest.srcFile 'AndroidManifest.xml'
            java.srcDirs = [qt5AndroidDir + '/src', 'src', 'java']
            aidl.srcDirs = [qt5AndroidDir + '/src', 'src', 'aidl']
            res.srcDirs = [qt5AndroidDir + '/res', 'res']
            resources.srcDirs = ['src']
            renderscript.srcDirs = ['src']
            assets.srcDirs = ['assets']
            jniLibs.srcDirs = ['libs']
       }
    }

    lintOptions {
        abortOnError false
    }
}

这是 build.gradle，其中包含我尝试添加的所有依赖项（我已将 classpath 'com.google.gms:google-services:4.3.14' 添加到 dependencies 部分和 apply plugin: 'com.google.gms.google-services' 行）：

buildscript {
    repositories {
        google()
        jcenter()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:3.2.0'
        classpath 'com.google.gms:google-services:4.3.14'
    }
}

repositories {
    google()
    jcenter()
}

apply plugin: 'com.android.application'
apply plugin: 'com.google.gms.google-services'

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar', '*.aar'])
    implementation 'androidx.appcompat:appcompat:1.0.2'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'androidx.swiperefreshlayout:swiperefreshlayout:1.1.0'
    implementation 'com.google.code.gson:gson:2.7'
    implementation 'com.jakewharton:process-phoenix:2.1.2' // https://github.com/JakeWharton/ProcessPhoenix
    implementation 'me.dm7.barcodescanner:zxing:1.9.13' // https://github.com/dm77/barcodescanner
}

android {
    /*******************************************************
     * The following variables:
     * - androidBuildToolsVersion,
     * - androidCompileSdkVersion
     * - qt5AndroidDir - holds the path to qt android files
     *                   needed to build any Qt application
     *                   on Android.
     *
     * are defined in gradle.properties file. This file is
     * updated by QtCreator and androiddeployqt tools.
     * Changing them manually might break the compilation!
     *******************************************************/

    // Buggy thing: fails to build. Needs to be replaced with actual numbers.
    // https://stackoverflow.com/a/46290586/3765267
    /*compileSdkVersion androidCompileSdkVersion.toInteger()
    buildToolsVersion androidBuildToolsVersion*/
    compileSdkVersion 30
    buildToolsVersion "30.0.2"

    sourceSets {
        main {
            manifest.srcFile 'AndroidManifest.xml'
            java.srcDirs = [qt5AndroidDir + '/src', 'src', 'java']
            aidl.srcDirs = [qt5AndroidDir + '/src', 'src', 'aidl']
            res.srcDirs = [qt5AndroidDir + '/res', 'res']
            resources.srcDirs = ['src']
            renderscript.srcDirs = ['src']
            assets.srcDirs = ['assets']
            jniLibs.srcDirs = ['libs']
       }
    }

    lintOptions {
        abortOnError false
    }
}

现在我在尝试构建项目时遇到以下奇怪的错误：

Generating Android Package
  Input file: C:/Work/Source/build-fdm-Android_Qt_5_12_12_Clang_armeabi_v7a-Debug/ui/android-libfdm.so-deployment-settings.json
  Output directory: C:/Work/Source/build-fdm-Android_Qt_5_12_12_Clang_armeabi_v7a-Debug/ui/android-build/
  Application binary: C:/Work/Source/build-fdm-Android_Qt_5_12_12_Clang_armeabi_v7a-Debug/bin/libfdm.so
  Android build platform: android-33
  Install to device: No

FAILURE: Build failed with an exception.

* Where:
Build file 'C:\Work\Source\build-fdm-Android_Qt_5_12_12_Clang_armeabi_v7a-Debug\ui\android-build\build.gradle' line: 18

* What went wrong:
A problem occurred evaluating root project 'android-build'.
> ASCII

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 3s

Answer 1

默认情况下，在 android 中，我们在 gradle 根模块中声明插件依赖项。好像在 qt 项目中我们只有一个平面层，只有一个 build.gradle 文件。好消息是我们也可以在settings.gradle 声明插件依赖

确保你在settings.gradle 中连接了插件：

pluginManagement {
    repositories {
        gradlePluginPortal()
        google()
        mavenCentral()
    }

    plugins {
        id 'com.android.application' version '7.3.1' apply false
        id 'com.google.gms.google-services' version '4.3.10' apply false
    }
}

现在您可以像这样在build.gradle 中应用插件：

plugins {
    id 'com.android.application'
    id 'com.google.gms.google-services'
} 

android { ... }