如何在 android studio 中解决这个依赖问题？

Question

我开始在 android studio 中构建一个项目，在添加了一些 firebase 身份验证依赖项后遇到了这个问题.. 'com.android.support:appcompat-v7:28.0.0' 下似乎有一条弯曲的红线。

这是 gradle 应用代码：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.aden.adenmarket"
        minSdkVersion 15
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    implementation 'com.android.support:design:28.0.0'
    implementation 'com.android.support:support-v4:28.0.0'
    implementation 'com.google.firebase:firebase-core:17.0.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    implementation 'com.google.firebase:firebase-auth:18.0.0'
}
apply plugin: 'com.google.gms.google-services'

这是项目 gradle：

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        google()
        jcenter()

    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.4.0'
        classpath 'com.google.gms:google-services:4.2.0'
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()

    }
}

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

....... 这是输出错误：

错误：清单合并失败：uses-sdk:minSdkVersion 15 不能 小于库中声明的版本 16 [com.google.firebase:firebase-auth:18.0.0] C:\Users\PC.gradle\caches\transforms-2\files-2.1\ce1ab53339b3343f02313d46e1b6166b\AndroidManifest.xml 因为该库可能正在使用 15 建议中不可用的 API： 使用 minSdk 最多为 15 的兼容库，或增加 这个项目的 minSdk 版本至少要 16，或者使用 tools:overrideLibrary="com.google.firebase.auth" 强制使用（可能 导致运行时失败）

Answer 1

尝试将 minSdkVersion 更改为 16。

Answer 2

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.aden.adenmarket"
        minSdkVersion 16
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    } }

在 gradle 文件中将 minSDK 更改为 16 如果您有其他带有 gradles 的本地库，也请更改它们

Answer 3

更新项目 build.gradle

buildscript {
    repositories {
        jcenter()
        mavenCentral()
        google()
        maven { url 'http://repo.maven.apache.org/maven2' }
        maven {
          url 'https://maven.fabric.io/public'
        }
    }
    dependencies {
    classpath 'com.android.tools.build:gradle:3.4.1'
    classpath 'com.google.gms:google-services:4.2.0'
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()

    }
}

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

应用模块分级：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    buildToolsVersion 28.0.3
    defaultConfig {
        applicationId "com.aden.adenmarket"
        minSdkVersion 19
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    implementation 'com.android.support:design:28.0.0'
    implementation 'com.android.support:support-v4:28.0.0'
    implementation 'com.google.firebase:firebase-core:17.0.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    implementation 'com.google.firebase:firebase-auth:18.0.0'
}
apply plugin: 'com.google.gms.google-services'

如果它显示在 lint 中，也更新其他依赖项。

Answer 4

如果你想使用firebase >= 17.0.0，你必须迁移到androidx

https://firebase.google.com/support/release-notes/android#update_-_june_17_2019

https://developer.android.com/jetpack/androidx/migrate