I create new project and Wants to Use Retrofit library in my Project.

I implemented this library for Gson and Retrofit but still I can't import it to my Project.

implementation 'com.google.code.gson:gson:2.9.0'
implementation 'com.squareup.picasso:picasso:2.8'

implementation 'com.squareup.retrofit2:retrofit:2.9.0'
implementation 'com.squareup.retrofit2:converter-gson:2.7.2'

Error to add Retrofit Library

CodePudding user response：

Here there is something to check weather it's all set or not.

1 - First implement the library in builde.gradle like below.

implementation 'com.google.code.gson:gson:2.9.0'
implementation 'com.squareup.picasso:picasso:2.8'

implementation 'com.squareup.retrofit2:retrofit:2.9.0'
implementation 'com.squareup.retrofit2:converter-gson:2.7.2'

2 - Add this properties to your gradle.properties

android.useAndroidX=true
android.nonTransitiveRClass=true

3 - Then Add Google() and mavenCentral in your settings.gradle like Below

pluginManagement {
    repositories {
        gradlePluginPortal()
        google()
        mavenCentral()
        maven { url 'https://jitpack.io' }
    }
}
dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
        google()
        mavenCentral()
        maven { url 'https://jitpack.io' }
    }
}

4 - check compileOptions in your build-gradle file

compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}

After all this steps you can import your retrofit and gson library.

CodePudding user response：

Did you sync your project with the gradle files? If not, the IDE (I suppose you use Android Studio?) will not be able to recognize/import the required library.

Check out the Android Studio documentation to learn how to do this.