android - 错误 : Failed to resolve: androidx. 生命周期 :lifecycle:2. 2.0-beta01

Question

我遇到了 build.gradle 的问题文件，特别是模块 'android.x.lifecycle' .

我有以下错误

ERROR: Failed to resolve: androidx.lifecycle:lifecycle:2.2.0-beta01
This is the last version of androidx.lifecycle

不知道是不是语法错误

这是 build.gradle 文件

    apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    defaultConfig {
        applicationId "com.flixarts.ar.englishnow"
        minSdkVersion 14
        targetSdkVersion 29
        buildToolsVersion '25.0.2'
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        multiDexEnabled true
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    buildToolsVersion = '28.0.3'
}

dependencies {
    implementation 'androidx.lifecycle:lifecycle:2.2.0-beta01'
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.recyclerview:recyclerview:1.0.0'
    implementation 'com.google.android.material:material:1.1.0-beta01'
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
    implementation 'com.google.android.gms:play-services-ads:18.2.0'
    implementation 'com.android.support:multidex:1.0.3'
    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 'androidx.cardview:cardview:1.0.0'
}

Answer 1

更改此行:

androidx.lifecycle:lifecycle:2.2.0-beta01

使用其中之一:

implementation "androidx.lifecycle:lifecycle-extensions:2.2.0-beta01"
implementation "androidx.lifecycle:lifecycle-viewmodel:2.2.0-beta01" 
implementation "androidx.lifecycle:lifecycle-livedata:2.2.0-beta01"
implementation "androidx.lifecycle:lifecycle-livedata-core:2.2.0-beta01"
implementation "androidx.lifecycle:lifecycle-runtime:2.2.0-beta01"

有关生命周期的更多信息 here .

还:

更改 com.android.support:multidex:1.0.3至androidx.multidex:multidex:2.0.1因为您使用的是 androidx 库

您正在添加 implementation 'androidx.appcompat:appcompat:1.1.0'三次

删除支持库:implementation 'com.android.support.constraint:constraint-layout:1.1.3'

删除 buildToolsVersion '25.0.2'和 buildToolsVersion = '28.0.3' (在任何情况下都不要使用 =)。您可以指定buildToolsVersion "29.0.2"在 android阻止或忽略它，gradle 将根据 targetSdkVersion 自动使用最新版本指定