尝试将 Firebase 依赖项添加到 Qt 项目时生成错误

Question

I would like to use Firebase the same way as in any native Android app non using Qt (ie using Java ). I'm already have one (all is working fine).

Now I'm trying to add Firebase to my existing Qt project. For now, I'm trying to add all the required dependencies to build.gradle (so I can use Firebase APIs in my Java source code part of my Qt project), and getting weird errors.

I'm not good in Gradle so any help is appreciated (if this is possible at all, because I'm using quite old Qt 5.12.12 ).

This is build.gradle I have (builds and runs fine):

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
    }
}

This is build.gradle with all the dependencies I try to add (I've added classpath 'com.google.gms:google-services:4.3.14' to dependencies section and apply plugin: 'com.google.gms.google-services' line):

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
    }
}

And now I'm getting the following weird error trying to build the project:

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

Addition #1. I can build using Qt 6.4.1 + Firebase. The question is about Qt 5.12.12. I suspect the reason is too old Gradle version it's using (4.6) or something like that.

Answer 1

By default in android we declare the plugin dependencies in gradle root module. Seems like in qt project we have only one flat layer with only one build.gradle file. The good news is that we can declare plugin dependencies in settings.gradle as well

Make sure you connected the plugin in settings.gradle :

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
    }
}

now you can apply the plugins in build.gradle like this:

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

android { ... }