Cordova fooks : build.gradle 内の sourceCompatibility と targetCompatibility を `JavaVersion.VERSION_1_7` に変更

fixBuildGradleSettings.js

module.exports = function(ctx) {
  // make sure android platform is part of build
  if (ctx.opts.platforms.indexOf('android') < 0) {
    return;
  }
  var fs = ctx.requireCordovaModule('fs'),
  path = ctx.requireCordovaModule('path'),
  deferral = ctx.requireCordovaModule('q').defer();

  var gradlePath = path.join(ctx.opts.projectRoot, 'platforms/android/build.gradle');
  fs.readFile(gradlePath, 'utf8', (err,data) => {
    if (err) {
      deferral.reject('Failed to open build.gradle');
      return deferral.promise;
    }
    // Change Java version
    var result = data.replace(/VERSION_1_6/g, 'VERSION_1_7');
    fs.writeFile(gradlePath, result, 'utf8', (err) => {
      deferral.reject('Failed to add dexOptions');
      return deferral.promise;
    });
    console.log('Replaced result : ' + result);
    deferral.resolve();
  });
  return deferral.promise;
};