错误：无法解决：androidx.lifecycle:lifecycle:2.2.0-beta01

Question

我遇到了build.gradle 文件的问题，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

改变这一行：

androidx.lifecycle:lifecycle:2.2.0-beta01

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"

关于生命周期的更多信息here。

还有：

• 将com.android.support:multidex:1.0.3 更改为androidx.multidex:multidex:2.0.1，因为您使用的是androidx 库
• 你正在添加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=）。您可以在android 块中指定buildToolsVersion "29.0.2" 或直接省略它，gradle 将根据指定的targetSdkVersion 自动使用最新版本