Android 1.5 Gradle Sync never ends

Question

I recently upgraded to Android Studio 1.5. However, after the upgrade, Gradle gets stuck in the "Project Update [Project] Gradle Project" and never stops.

The previous version of Android Studio did a great job.

How can i solve this?

I work on a 64 bit Ubuntu 15.10 machine.

Edit:
So far, I have been trying to remove Android Studio from / opt and download the latest version. Did not help.

I also tried to delete the directory ~/.AndroidStudio1.5. But to no avail.

This is in my "Event Log"

Gradle synchronization started
NullPointerException: null

Answer 1

Android gradle -wrapper.properties, * project/gradle/wrapper:

From:

distributionUrl = HTTPS://services.gradle.org/distributions/ gradle -2.4-all.zip

To:

distributionUrl = HTTPS://services.gradle.org/distributions/ gradle -2.8-all.zip

build.gradle, :

 dependencies {
    classpath 'com.android.tools.build:gradle:1.5.0'
}

Answer 2

build.gradle gradle 1.5.0

:

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:1.5.0'
    }
}

allprojects {
    repositories {
        jcenter()
    }
}

Answer 3

Preferences > Build, Execution > Build Tools > Gradle Gradle Home. , , /Applications/Android Studio.app/Contents/gradle/gradle-2.4, /Applications/Android Studio.app/Contents/gradle/gradle-2.8

Answer 4

. JAVA_HOME . Ehsun Mehranvaris , . Android . /gradlew, , JAVA_HOME .

java, :

readlink -f $(which java)

JAVA_HOME :

export JAVA_HOME=/usr/lib/jvm/java-7-oracle/jre

Android :

./gradlew

, gradle 2.8. Android Studio , JAVA_HOME. .

gradle Android Studio . , Preferences > Build, Execution > Build Tools > Gradle