How to set -source 1.7 in Android Studio and Gradl

Question

I'm getting following error when trying to compile my project in Android Studio:

Gradle: error: diamond operator is not supported in -source 1.6

I have 1.7 set as target in all project preferences I've found. Also the path displayed in project SDK's under 1.7 SDK is correct path to java 1.7 installation.

Even when I run java -version in terminal, it tells me I'm running on java 1.7.

I have tried to set JAVA_HOME env variable to this:

/Library/Java/JavaVirtualMachines/jdk1.7.0_25.jdk/Contents/Home

The error does not go away. How do I eliminate the error?

Answer 1

Right click on your project > Open Module Setting > Select "Project" in "Project Setting" section

Change the Project SDK to latest(may be API 21) and Project language level to 7+

Answer 2

Java 7 support was added at build tools 19. You can now use features like the diamond operator, multi-catch, try-with-resources, strings in switches, etc. Add the following to your build.gradle.

android {
    compileSdkVersion 19
    buildToolsVersion "19.0.0"

    defaultConfig {
        minSdkVersion 7
        targetSdkVersion 19
    }

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_7
        targetCompatibility JavaVersion.VERSION_1_7
    }
}

Gradle 1.7+, Android gradle plugin 0.6.+ are required.

Note, that only try with resources require minSdkVersion 19. Other features works on previous platforms.

Link to android gradle plugin user guide

Link to see how source vs target are different

Answer 3

Latest Android Studio 1.4.

Click File->Project Structure->SDK Location->JDK Location.

You could also set individual module JDK Version compatibility by going to the Module (below the SDK Location), and edit the Source Compatibility accordingly. (note, this only applies to Android Module).

Answer 4

Always use latest SDK version to build:

compileSdkVersion 23

It does not affect runtime behavior, but give you latest programming features.

Answer 5

You can change it in new Android studio version(0.8.X)

FIle-> Other Settings -> Default Settings -> Compiler (Expand it by clicking left arrow) -> Java Compiler -> You can change the Project bytecode version here

Answer 6

Go into your Gradle and look for sourceCompatibility and change it from 1.6 to 7. That worked for me at least.

You can also go into your module settings and set the Source/Target Compatibility to 1.7.

Module settings window

That will produce the following code in your Gradle:

compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_7
    targetCompatibility JavaVersion.VERSION_1_7
}