Finch

Finch offers a customizable debug menu for Android app development. It does not affect production code. Developers can easily add their own custom debugging features with simple steps.

Gradle Dependency

Add it in your root build.gradle at the end of repositories:

dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
        mavenCentral()
        maven { url 'https://jitpack.io' }
    }
}

Pick a UI implementation and add the dependency:

• ui-activity - The debug menu as a new screen.
• ui-bottom-sheet - The debug menu as a modal bottom sheet.
• ui-dialog - The debug menu as a modal dialog.
• ui-drawer - The debug menu as a side navigation drawer.
• ui-view - The debug menu as a view.
• noop - For release build.

dependencies {
    debugImplementation 'com.github.kernel0x.finch:ui-drawer:2.2.11'
    releaseImplementation 'com.github.kernel0x.finch:noop:2.2.11'
    // optional only for OkHttp
    debugImplementation 'com.github.kernel0x.finch:log-okhttp:2.2.11'
    releaseImplementation 'com.github.kernel0x.finch:log-okhttp-noop:2.2.11'
    // optional only for GRPC
    debugImplementation 'com.github.kernel0x.finch:log-grpc:2.2.11'
    releaseImplementation 'com.github.kernel0x.finch:log-grpc-noop:2.2.11'
    // optional only for logs
    debugImplementation 'com.github.kernel0x.finch:log:2.2.11'
    releaseImplementation 'com.github.kernel0x.finch:log-noop:2.2.11'
}

How to works

Initialize an instance of Finch (preferably in the Application's onCreate() method)

Finch.initialize(this)

Various customizations are set through the Configuration object.

Next, you need to add which components you want to display in the debug menu. Optionally, you can additionally configure logging and interception network events (with OkHttp).

Logging

To add log messages in Debug Menu simple calling Finch.log() and add FinchLogger to Configuration object.

Finch.log("message")

Finch.initialize(
    application = this,
    configuration = Configuration(
        logger = FinchLogger,
        ...
    ),
)

OkHttp

Add FinchOkHttpLogger.logger to the method addInterceptor in building OkHttp Client and add FinchOkHttpLogger to Configuration object.

OkHttpClient.Builder()
    .addInterceptor(FinchOkHttpLogger.logger as? Interceptor ?: Interceptor { it.proceed(it.request()) })
    .build()

Finch.initialize(
    application = this,
    configuration = Configuration(
        networkLoggers = listOf(FinchOkHttpLogger),
        ...
    ),
)

Grpc

Add FinchGrpcLogger.logger to the method intercept in building ManagedChannel and add FinchGrpcLogger to Configuration object.

ManagedChannelBuilder.forAddress(networkConfig.hostname, networkConfig.port)
    .intercept(FinchGrpcLogger.logger as? ClientInterceptor ?: object : ClientInterceptor {
        override fun <ReqT : Any?, RespT : Any?> interceptCall(
            method: MethodDescriptor<ReqT, RespT>?,
            callOptions: CallOptions?,
            next: Channel?
        ): ClientCall<ReqT, RespT> {
            return object : ForwardingClientCall.SimpleForwardingClientCall<ReqT, RespT>(
                next?.newCall(
                    method,
                    callOptions
                )
            ) {}
        }
    })
    .build()

Finch.initialize(
    application = this,
    configuration = Configuration(
        networkLoggers = listOf(FinchGrpcLogger),
        ...
    ),
)

Example initialize

Here is a minimal example that should work for most projects

Finch.initialize(
    application = this,
    configuration = Configuration(
        logger = FinchLogger,
        networkLoggers = listOf(FinchOkHttpLogger)
    ),
    components = arrayOf(
        Header(
            title = getString(R.string.app_name),
            subtitle = BuildConfig.APPLICATION_ID,
            text = "${BuildConfig.BUILD_TYPE} v${BuildConfig.VERSION_NAME} (${BuildConfig.VERSION_CODE})"
        ),
        Padding(),
        Label("Tools", Label.Type.HEADER),
        DesignOverlay(),
        AnimationSpeed(),
        ScreenCaptureToolbox(),
        Divider(),
        Label("Logs", Label.Type.HEADER),
        LifecycleLogs(),
        NetworkLogs(),
        Logs(),
        Divider(),
        Label("Other", Label.Type.HEADER),
        DeviceInfo(),
        AppInfo(),
        DeveloperOptions(),
        ForceCrash()
    )
)

Common cases

Backend environment

data class Environment(
    val type: Type,
    override val title: Text = Text.CharSequence(type.name)
) : FinchListItem

enum class Type {
    TEST,
    PROD
}

SingleSelectionList(
    title = "Backend environment",
    items = listOf(Environment(Type.TEST), Environment(Type.PROD)),
    initiallySelectedItemId = Type.TEST.name,
    isValuePersisted = true,
    onSelectionChanged = {
        when (it?.type) {
            Type.TEST -> {
                ...
            }

            Type.PROD -> {
                ...
            }

            else -> {
                // nothing
            }
        }
    }
),

Feature Toggles

fun Application.initializeDebugMenu(
    featureManager: FeatureManager
) {
    val toggles = featureManager.getAll().map {
        Switch(
            text = it.description,
            initialValue = it.isEnabled(),
            isEnabled = true,
            onValueChanged = { value ->
                featureManager.save(it.key, value)
                if (!it.canChangedInRuntime) {
                    Toast.makeText(this, "Restart app to apply changes!", Toast.LENGTH_LONG).show()
                }
            }
        )
    }
    Finch.initialize(
        ...
        components = arrayOf(
            ...
            Divider(),
            Label("Feature Toggles", Label.Type.HEADER),
            Switch(
                text = "Show",
                initialValue = false,
                isEnabled = true,
                id = "feature_toggles",
                onValueChanged = {
                    if (it) {
                        Finch.add(
                            components = toggles.toTypedArray(),
                            position = Position.Below("feature_toggles")
                        )
                    } else {
                        toggles.forEach { item ->
                            Finch.remove(item.id)
                        }
                    }
                }
            ),
            ...
        )
    )
}

Logs

class LogTree : Timber.Tree() {
    override fun log(priority: Int, tag: String?, message: String, t: Throwable?) {
        FinchLogger.log(message)
    }
}

fun Application.initializeDebugMenu() {
    ...
    Timber.plant(LogTree())
    Finch.initialize(
        application = this,
        configuration = Configuration(
            logger = FinchLogger,
        ),
        ...
    )
}

Components

CheckBox Divider ItemList KeyValueList Label LongText MultipleSelectionList Padding ProgressBar SingleSelectionList Slider Switch TextInput AnimationSpeed AppInfo DesignOverlay DeveloperOptions DeviceInfo ForceCrash Header LifecycleLogs Logs LoremIpsumGenerator NetworkLogs

Proguard

-keep,allowobfuscation,allowshrinking class com.google.gson.reflect.TypeToken
-keep,allowobfuscation,allowshrinking class * extends com.google.gson.reflect.TypeToken

Releases

Checkout the Releases tab for all release info.