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Marshall Harry

Building for Billions

https://developers.google.com/billions/

1. Connectivity

Optimize Networking

  • Prioritize traffic (grab text first, media later)
  • De-duplicate network requests (don’t send same request, utilize cache)
  • Adjust behavior by connection (handle every possible probability in connection)

Optimize Images

  • Serve webp images (BitmapFactory has all you need to convert between image formats)
  • Serve dynamic images size (adjust with device’s resolution)

Useful Offline Experience

  • Caching
  • Image loading library
  • Test in airplane mode
developers.google.com/speed/webp
CodePalette, place holder for image

2. Device Capability

Screen Sizes

  • Build for small and medium screens (use dp)
  • Optimize for ldpi and mdpi
  • Test with several emulator configs

Efficient Memory Usage

  • Adjust footprint by available RAM
  • Avoid long-running processes

Smart Storage Use

  • Bounded caches
  • Allow install to SD card
  • measure via app setting

Backward Compability

  • Target sdk 24
  • Minimum sdk 14
  • Use android support libraries
  • Use google play services
RAM utilization : isLowRamDevice(); getMemoryClassic()
Storage utilization : getCacheDir();

3. Data Cost

APK Size

  • Images are biggest offenders (SVG for icons)
  • Reduce code size, use proguard
  • Multi-APK as an option (depend on resolution)

Data Use

  • Allow user configurable data use
Set following in build.gradle : minifyable=true; shrinkResource=true

4. Battery Consumption

  • Eliminate unneeded wake ups
  • Batch network requests
Use GcmNetworkManager API -> has nothing to do with GCM nor Network. It just manage

5. Content

Fast and Responsive UI

  • Touch feedback everywhere
  • UI always interactive
  • Always target 60 FPS
  • Consider launch screens

UI Best Practices

  • Adhere to material design
  • Use design support library

Localization

  • Support your user’s locale
  • Use appropriate fonts (e.g. Noto)

6. Commerce

Monetization

  • Advertisement
  • In-app purchase
  • Subscription
  • Paid app

Local Price

  • Sub-dollar prices available in over 18 countries
  • Helps offer locally affordable products
SafetyNet : to check whether the device is certified