Oliver Spryn oliverspryn

☀️

Everyday is a great day!

Lead Android Architect at @upmc-enterprises + Content Creator + Instructor

oliverspryn / MainActivity.kt

Created November 12, 2021 13:39

Dagger injecting the build type into the MainActivity

	class MainActivity : AppCompatActivity() {

	@Named(BuildModule.buildType)
	@Inject
	lateinit var buildType: String

	override fun onCreate(savedInstanceState: Bundle?) {
	super.onCreate(savedInstanceState)

	DaggerMainComponent

oliverspryn / ImageController.kt

Created November 12, 2021 13:36

The image decoder with proper support for testing API-dependent code

	class ImageController @Inject constructor(
	@Named(BuildModule.sdkVersion) private val sdkVersion
	) {
	fun decodeAndProcessImage(uri: Uri) {
	val bitmap = if (sdkVersion < Build.VERSION_CODES.P) {
	MediaStore.Images.Media.getBitmap(contentResolver, uri)
	} else {
	val source = ImageDecoder.createSource(contentResolver, uri)
	ImageDecoder.decodeBitmap(source)
	}

oliverspryn / BuildModule.kt

Last active November 12, 2021 13:40

Dagger providing static values on the Build and BuildConfig objects

	@Module
	class BuildModule {
	companion object {
	const val buildType = "com.example.dagger.modules.BuildModule.buildType"
	const val debug = "com.example.dagger.modules.BuildModule.debug"
	const val sdkVersion = "com.example.dagger.modules.BuildModule.sdkVersion"
	}

	@Provides
	@Named(debug)

oliverspryn / MainActivity.kt

Last active November 12, 2021 13:41

A slightly more realistic view of the compiled code after the constants are inlined

	class MainActivity : AppCompatActivity() {
	override fun onCreate(savedInstanceState: Bundle?) {
	super.onCreate(savedInstanceState)

	if ("debug" == "release") {
	window.setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE)
	}
	}
	}

oliverspryn / MainController.kt

Last active November 12, 2021 13:41

An activity which sets the security flag for release builds

	class MainActivity : AppCompatActivity() {
	override fun onCreate(savedInstanceState: Bundle?) {
	super.onCreate(savedInstanceState)

	if (BuildConfig.BUILD_TYPE == "release") {
	window.setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE)
	}
	}
	}

oliverspryn / TestHelpers.kt

Created November 12, 2021 13:19

A function to change the value of Build.VERSION

	object TestHelpers {
	// Usage: TestHelpers.setSdkVersion(Build.VERSION_CODES.P)
	fun setSdkVersion(version: Int) {
	val field = Build.VERSION::class.java.getField("SDK_INT")
	field.isAccessible = true

	val modifiersField = Field::class.java.getDeclaredField("modifiers")
	modifiersField.isAccessible = true
	modifiersField.setInt(field, field.modifiers and Modifier.FINAL.inv())

oliverspryn / ImageController.kt

Last active November 12, 2021 13:35

A function which spans multiple API versions to decode a bitmap

	class ImageController {
	fun decodeAndProcessImage(uri: Uri) {
	val bitmap = if (Build.VERSION.SDK_INT < Build.VERSION_CODES.P) {
	MediaStore.Images.Media.getBitmap(contentResolver, uri)
	} else {
	val source = ImageDecoder.createSource(contentResolver, uri)
	ImageDecoder.decodeBitmap(source)
	}

	// Do something with the Bitmap

oliverspryn / colors.xml

Created November 5, 2021 12:41

The light mode variant of the color pallet

	<?xml version="1.0" encoding="utf-8"?>
	<resources>
	<color name="launcher_background_color">@android:color/system_accent1_100</color>
	<color name="launcher_foreground_android_color">@android:color/system_neutral1_800</color>
	</resources>

oliverspryn / colors.xml

Created November 5, 2021 12:41

The dark mode variant of the color pallet

	<?xml version="1.0" encoding="utf-8"?>
	<resources>
	<color name="launcher_background_color">@android:color/system_neutral1_800</color>
	<color name="launcher_foreground_android_color">@android:color/system_accent1_100</color>
	</resources>

oliverspryn / colors.xml

Created November 5, 2021 12:26

A color pallet using my brand's color scheme

	<?xml version="1.0" encoding="utf-8"?>
	<resources>
	<color name="launcher_background_color">#3DDC84</color>
	<color name="launcher_foreground_android_color">#FFFFFF</color>
	</resources>