Gradle commands for projects that have a gradlew file generated with android project create -g -v X.
Those are created with Android Studio. Find version used by studio: http://stackoverflow.com/questions/25260172/how-to-check-the-gradle-version-in-android-studio
They rely on the Android plugin for Gradle: http://developer.android.com/tools/building/plugin-for-gradle.html TODO source.
Ant is another possibility, which is generated by adb create project.
The examples under samples/ also use Gradle.
List Gradle tasks
./gradlew tasks
Clean build and install:
./gradlew clean
./gradlew assembleDebug
./gradlew installDebug
Stands for Gradle Wrapper.
Deals for example with Gradle virtualization: this script can download and use a required version of Gradle for a given project, even if your distribution does not offer it.
https://docs.gradle.org/current/userguide/gradle_wrapper.html
Impossible apparently: http://stackoverflow.com/questions/23960667/running-gradles-connectedandroidtest-on-a-specific-device