Gradle returns package does not exists [duplicate]

问题:

This question already has answers here:

Specifying Maven dependencies in build.gradle doesn't work (5 answers)

Closed last year.

I'm trying to add the gson library to my android project (I'm devloping using the Andrdoid-studio).

To add the library, I changed the AppProject/AppName/build.gradle file in this way:

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:0.4'
    }
}
apply plugin: 'android'

repositories {
    mavenCentral()
}

dependencies {
    compile files('libs/android-support-v4.jar')
    compile 'com.google.code.gson:gson:2.2.4'
}

android {
    compileSdkVersion 17
    buildToolsVersion "17.0.0"

    defaultConfig {
        minSdkVersion 4
        targetSdkVersion 16
    }
}

It seems to work until I try to use it.

When I try to include it with:

import com.google.code.gson;

Gradle complains affirming:

Gradle: error: package com.google does not exist

回答1:

The accepted answer did not work for me, but this did:

• Download the GSON JAR file and copy it to your /libs/ folder inside your application project.

• Open the build.gradle file at the root level of your project and edit your dependencies to include the new .jar file:

  dependencies {
      compile fileTree(dir: 'libs', include: '*.jar')
  }
  

• Build -> Rebuild Project

Optionally, you can specify one or more specific JAR files with files rather than fileTree, such as: compile files('libs/google-gson-1.7.1/gson-1.7.1.jar')

回答2:

One solution that might be helpful is to try Syncing Project with Gradle Files

Tools -> Android -> Sync Project with Gradle Files

回答3:

In my projects this happens sometimes in the :javadoc task. If you do not need the :javadoc task you can ignore it with:

./gradlew :install -x :javadoc