notes/docs/lectures/mdp/16_app_testing.md

App Optimisation, Testing & Deployment

Check Memory Usage

• abd shell dumpsys meminfo <package_name>
  • Check if memory size increased since launch
  • Number of objects that have been created
  • Database information
• Terminology:
  • Native Heap: memory used by the process itself
  • Dalvik Heap: memory allocated by DalvikVM
  • Dalvik Other: memory used for JIT
  • Pss total: all connections to the main device memory thread
  • Private dirty: actual amount of RAM the app is using on the heap since the app started

Code Optimisation

• Minimise object creation
• Make a method static if there is no need to modify the state of an object
• Make any constants static final
• Int is 2x faster than float
• Use enhanced for loops (for-each instead of regular for loops)

App Testing

• Generally, developing tests is done before developing code

Unit Tests

• Build unit tests to verify the logic of specific code in the app
• Local tests
  • run on the local Java VM
• Instrumented tests
  • run based on the Android dependencies
  • Can use mockito or robolectric to isolate a unit from its dependencies

UI Tests

• Test an entire sequence of events, user interface, end-to-end testing on emulators & devices

• Tools: AndroidJUnitRunner & Espresso API & UI Automator

• Modify build.gradle

  dependencies{
      androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
  }
  

• Espresso records UI interactions and can use these to run a repeatable test automatically

Monkey (stress test)

• Runs on an emulator and generates pseudo-random streams of user events (clicks, touches, gestures and system-level events)

$ adb shell monkey [options] <event-count>
$ adb shell monkey -p your.package.name -v 500

APK Generation

• Use a good / unique package name
  • [org/com].[company].[product].[component]
• Build -> Generate Signed APK

Shrink Code & Resources (Proguard)

buildTypes {
    release {
        minifyEnable true
        shrinkResources true
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}

Can try proguard-android-optimize.txt for more code shrinking