Compile and launch android app from the command line.

build.gradle

task deployDebug(type: Exec, dependsOn: 'app:installDebug') {
  def rootDir = project.rootDir
  def localProperties = new File(rootDir, "local.properties")
  if (localProperties.exists()) {
    Properties properties = new Properties()
    localProperties.withInputStream {
      inputStream -> properties.load(inputStream)
    }
    def sdkDir = properties.getProperty('sdk.dir')
    def adb = "$sdkDir/platform-tools/adb"
    commandLine "$adb", 'shell', 'am', 'start', '-n', 'com.package/com.package.YourMainActivity'
  }
}

@jlobos thanks!!