code: function runAndroid(argv, config, args) {
    if (!checkAndroid(args.root)) {
      console.log(chalk.red('Android project not found. Maybe run react-native android first?'));
      return;
    }
  
    return isPackagerRunning().then(result => {
      if (result === 'running') {
        console.log(chalk.bold('JS server already running.'));
      } else if (result === 'unrecognized') {
        console.warn(chalk.yellow('JS server not recognized, continuing with build...'));
      } else {
        // result == 'not_running'
        console.log(chalk.bold('Starting JS server...'));
        startServerInNewWindow();
      }
      return buildAndRun(args);
    });
  }
docs: Starts the app on a connected Android emulator or device.