LINKa. Paper Board

Android app and input method for composing text from a paged symbol grid. The app can speak composed text with Android TextToSpeech and can also be enabled as a system keyboard.

Project

• Single Android application module: :app.
• Package and namespace: su.linka.linkapaperboard.
• Launcher UI entrypoint: MainActivity.
• Keyboard service entrypoint: PaperboardIME.
• Shared grid UI layout: app/src/main/res/layout/keys.xml.

Requirements

• JDK 17.
• Android SDK with compileSdk 36 installed.
• Use the checked-in Gradle wrapper: ./gradlew.

Build

./gradlew assembleDebug

Release bundle, matching CI:

./gradlew clean bundleRelease

Release signing is optional locally. To produce a signed release artifact, set:

ANDROID_KEYSTORE=/path/to/keystore
ANDROID_KEYSTORE_PASSWORD=...
ANDROID_KEY_ALIAS=...
ANDROID_KEY_PASSWORD=...

Test And Lint

Run all local JVM unit tests:

./gradlew testDebugUnitTest

Run one test class:

./gradlew testDebugUnitTest --tests su.linka.linkapaperboard.CookieTest

Run debug lint:

./gradlew lintDebug

Verify that the merged release manifest and runtime contain neither Crashlytics nor AppMetrica:

./gradlew verifyPrivacyConfiguration

Run instrumented tests only with a connected device or emulator:

./gradlew connectedDebugAndroidTest

Notes

• The selectable alphabet is localized via @string/alphabet; English and Russian alphabets intentionally differ.
• The space key is stored internally as ␣ and converted to a real space when a grid item is clicked.
• Cookie stores app preferences in SharedPreferences; tests that touch it should reset state with Cookie.resetForTests(context).
• The first privacy notice is informational and can be deferred without disabling TTS or the input method. Crashlytics and AppMetrica are not included in the app.