please using $ANDROID_HOME to make absolute path to call adb command

[baivoom]

Issue

npx weex run android
...

/bin/sh: 1: adb: not found

Reason and Solution

source: weexpack/lib/run/android.js
Using absolute path from $ANDROID_HOME instead of relative path to call 'adb' command.

var prepareAndroid = function prepareAndroid(_ref) {
  var options = _ref.options;

  return new Promise(function (resolve, reject) {
    var rootPath = process.cwd();

    logger.info('start Android app \n');

    // change working directory to android
    process.chdir(path.join(rootPath, 'platforms/android'));
    if (!process.env.ANDROID_HOME) {
      logger.error('Environment variable $ANDROID_HOME not found !');
      logger.log('You should set ANDROID_HOME in your environment first.');
      logger.log('See ' + chalk.cyan('https://spring.io/guides/gs/android/'));
      reject();
    }
    const adb = `${process.env.ANDROID_HOME}/platform-tools/adb`
    try {
      childprocess.execSync(`${adb} start-server`, {
        encoding: 'utf8'
      });
    } catch (e) {
      reject(new Error(`execute 'adb start-server' failed. ${e}`));
      return;
    }