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MeetUp on Building Apps Using Meteor.JS at Mantra Labs

On July 24, 2016, Mantra Labs organized a MeetUp at their Head-office in Bangalore. Mr. Atul Yadav was the lead speaker at the conference. He kicked off the MeetUp with the keynote Meteor and addressed why Meteor is becoming a mainstream framework? And why developers are going Meteor way. The MeetUp was attended by Web and Mobile development experts, who were eager to know why Meteor?

In his power point presentation he highlighted some of the major points that support developers for choosing Meteor.

He said, “Every developer is looking for a common framework that can be used for the web and mobile – to save time and effort. Meteor is one such framework that solves this problem for the developer community”. “At the same time, this also speeds up the development process for the client”, he added.

Why Meteor?

Meteor is the simplest possible app framework, yet fully-powered “gateway drug” into modern JavaScript development. Even if you don’t end up sticking with Meteor, your mind will be opened to new possibilities after spending some time with it.

Meteor has been built on concepts from other frameworks and libraries in a way that makes it easy to prototype applications. Even Angular and React are not as accessible to a wide range of developers as Meteor is, because of a steeper learning curve, and a bit more abstraction that requires more programming skills to use. Meteor on the other hand is easy to learn and quick to build with, as it is flexible and requires less code, which means less bugs and typically a higher quality and more stable end result.

This framework from JavaScript can help you to get a MVP built quickly, and the framework has the ambition to allow developers to scale their apps well beyond MVP-stage. It is establishing itself as a mainstream development technology on the same level as Rails or even vanilla Node.js.

The reasons why Meteor is hottest frameworks for development in today’s time. The 11 major point on Meteor were:

1. Real Time Web Development:
Meteor is a development framework that has got the distinctive feature of real time development.

2. Develop with a Single Language:
With Meteor, the development process is highly simplified with frontend, backend and database all rolled into one language – Javascript. Another benefit of this feature is that it works equally well for the client side as well as the server side.

3. Avail Smart Packages:
Meteor helps you to create users through and accounts system that is highly simplified. The system makes the process highly simplified. You can also use the smart package to do other things like: Writing CoffeeScript apps etc.

4. Large and Helpful Community:
Meteor has a large and helpful community for you to get on with the basics really fast. There is lots of proper documentation of the framework that makes it really useful.

5. Simplified For Developers:
Javascript is devoid of CSS, HTML and Javascript which makes the development process really simple in Meteor.

6. Easy To Learn:
There is enough community support and by just knowing a single development language, one can learn Meteor with ease.

7. Meteor Is The Framework Of The Future:
With features like real time development and ease of use for developers and users, Meteor is certainly the development framework of the future.

8. Meteor Is Easy To Set Up:
One can easily start creating projects in Meteor as soon as it is installed. This makes the process much simpler and faster.

9. Faster Development and Testing of Lean Products:
Start-ups are mostly looking to develop lean products which are quick to develop and can be test marketed equally quickly. Meteor provides suited solution for lean start-ups. They can create smaller product and test market it, in a short span of time.

10. Meteor for Native Mobile Apps:
A developer can build faster native mobile apps with Cordova integration using meteor.

11. Project Scalability:
Scalability is the prime concern of large projects run by enterprises. Meteor is a highly scalable framework and that is what makes it so highly preferred for large scale projects. In addition to that, meter is soon coming up with a hosting service which shall definitely be an add-on for businesses.

Mr Atul wrapped-up the MeetUp with these highlighted points. Over all the MeetUp was successful.
If any queries on Meteor MeetUp, feel free to approach us on hello@mantralabsglobal.com.

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8 Best Ways to Reduce Android App Size

5 minutes, 29 seconds read

With the increase in mobile storage spaces that have gone up to 256 GB, app size is also growing. App size is sure to grow as developers are adding new features, trying to meet customer needs, and also trying to support their apps on various screen sizes. Around 74% of the world uses Android, and 70% of users consider app size before installing them. Moreover, as humans are getting accustomed to instant gratification, they ponder on ways to download apps as they take up storage spaces. Despite the cloud support for photos, videos, and files, android users face issues, such as mobile hanging due to app size. As customer expectations are increasing, android app developers are considering other ways to reduce app size while still incorporating significant additional features and keeping in mind the customer experience.

Below are the 8 best ways to reduce android app size:

1. Use Android App Bundle to Reduce App Size

When generating the release version of your app, you can choose between APK and Android App Bundle.  The second option will make Google play to generate the APK with only those features a specific user need. 

Use Android App Bundle

App Bundle Vs APK

Android App Bundle

  • It is a publishing format that includes compiled code and resources of your app, and delays APK generation and signing to Google Play.
  • With Android App Bundles, the compressed download size restriction is 150 MB. The app bundle cannot be used with APK expansion files.
Android App Bundle
Important: In the second half of 2021, new apps will be required to publish with the Android App Bundle on Google Play. New apps larger than 150 MB must use either Play Feature Delivery or Play Asset Delivery.

How to build android app bundles?

To build app bundles, follow these steps:

  1. Download Android Studio 3.2 or higher—it’s the easiest way to add feature modules and build app bundles.
  2. Add support for Play Feature Delivery by including a base module, organizing code and resources for configuration APKs, and, optionally, adding feature modules.
  3. Build an Android App Bundle using Android Studio. You can also deploy your app to a connected device from an app bundle by modifying your run/debug configuration and selecting the option to deploy APK from app bundle. Keep in mind, using this option results in longer build times when compared to building and deploying only an APK.
  4. If you’re not using the IDE, you can instead build an app bundle from the command line.
  5. Test your Android App Bundle by using it to generate APKs that you deploy to a device.
  6. Enroll into app Play App Signing. Otherwise, you can’t upload your app bundle to the Play Console.
  7. Publish your app bundle to Google Play.

Please note: Android Package Kit – As per developer console, by the mid of 2021, developers won’t be able to upload apk on play store)

  • Android operating system uses APK which is the package file format for distribution and installation of mobile apps, games and middleware. APK is similar to other software packages such as APPX in Microsoft Windows or a Debian package in Debian -based operating systems.
  • Google Play requires that the compressed APK downloaded by the users should not exceed 100 MB.
  • The expansion files for your app are hosted by Google Play which serves them to the device at no cost to you. The expansion files are saved to the device’s shared storage location (the SD card or USB-mountable partition).

2. Use Proguard

Proguard is probably one of the most useful tools to reduce your APK size. It reduces the source code files to a minimum and can reduce the APK file size upto 90%.

  • Use it in all variants whenever using “Proguard”
  • Helps to avoid conflict at the of generate apk or bundle if will use in all the variants.
  • We cannot let ProGuard rename or remove any fields on these data classes, as they have to match the serialized format. It’s a safe bet to add a @Keep annotation on the whole class or a wildcard rule on all your models.

3. Use Android Size Analyzer Plugin

This Android Studio plugin will provide you recommendations to reduce the size of your application.

With the APK Analyzer, you can accomplish the following:

  • View the absolute and relative size of files in the APK, such as the DEX and Android resource files.
  • Understand the composition of DEX files.
  • Quickly view the final versions of files in the APK, such as the AndroidManifest.xml file.
  • Perform a side-by-side comparison of two APKs.

There are three ways to access the APK Analyzer when a project is open:

  • Drag an APK into the Editor window of Android Studio.
  • Switch to the Project perspective in the Project window and then double-click the APK in the default build/output/apks/ directory.
  • Select Build > Analyze APK in the menu bar and then select your APK.

More details at: Jetbrains

4. Optimize Your App’s Resources

Whether used or not, every resource takes up memory. It is therefore necessary to have only those resources that you need, and to use those in a memory efficient way. In other words, you should consider the resolution of the image before finalizing on it.

5. Optimize Libraries

As large libraries consume huge amounts of space, it is advisable to remove parts of it in case you do not need them and if it is permitted by the license of the library. Proguard can aid you in this process but it is not always able to remove large internal dependencies.

6. Use Vector Graphics Wherever Possible

They are sharp and do not consume much space as they rely on mathematical calculations and not on pixels that need to be saved. However, they cannot be used for photography.

7. Compress Your Images

By using tools such as pngcrush, you can reduce the file size of PNG images. It is advisable to do this images as they still look the same. 

8. Only Support Specific Densities

If only a small portion of users use a specific density, it might be better to let Android scale your other densities for them as it would reduce your APK size.


As mobile storage space is growing, people are installing a large number of apps to meet a wide range of needs. But as app size is increasing, people are continuing to struggle with storage issues. With provisions such as Proguard, one can compress the APK file size and optimize libraries easily. Compressing images and using vector graphs are also useful in reducing app size.

About the author: Anand Singh is Tech Lead at Mantra Labs. He is integral to the company’s Android-based projects and enterprise application development.

Further Reading:

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