Failed to resolve: support-fragment error when add google architecture component dependency

问题

I want to use Google architecture components in my app, but after updating android studio to version 3.1.1 when I add android.arch.lifecycle:extensions:1.1.1 dependency into app.gradle file, it will show Failed to resolve: support-fragment
My gradle version is 4.4

This is app gardle:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "ir.apptori.myapplication"
        minSdkVersion 17
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner 
 "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'

    implementation "android.arch.lifecycle:extensions:1.1.1"
}

Please guid me how to fix it, Thanks

回答1:

I had a similar error and changing the repositories order so that google() comes before jcenter() fixed it.

I had to change the order for the repositories within buildscript and allprojects in the top level build.gradle file.

Please see this commit: https://github.com/kunadawa/ud851-Exercises/commit/9f6720ef4d52c71b206ddaa8477f2cf6e77a66f4

回答2:

I also had to remove the maven url from the project build.gradle as in:

 buildscript {
        repositories {
            google()
            jcenter()
          //  maven { url 'https://maven.google.com' }
        }
        dependencies {
            classpath 'com.android.tools.build:gradle:3.1.3'

        }
    }

    allprojects {
        repositories {
            google()
            jcenter()
        }
    }

---

This now works for me.

回答3:

i add this line in build.gradle and fixed bug : implementation 'androidx.fragment:fragment:1.2.5'

回答4:

This just happened to me with a project I cloned from github.

I updated my SDK and buildtools and had to double check all the dependencies to match the buildToolsVersion and the compileSdkVersion from the project.

The error message wasn't very clear when I tried to sync the project, it only gave me a more explicit error when I tried to run and it failed.

Could not find support-fragment.jar (com.android.support:support-fragment:27.0.2).

Good Luck!

回答5:

for a similar issue its solved by changing material implementation from alpha2 version to alpha 7 in the app build.gradle file

implementation 'com.google.android.material:material:1.1.0-alpha07'

回答6:

add these two to build.gradle -> repositories

{
mavenCentral()
google() 
}

and add to these are to allprojects

allprojects {
repositories {
mavenCentral()
google()
}
}

来源：https://stackoverflow.com/questions/49781097/failed-to-resolve-support-fragment-error-when-add-google-architecture-component