# Keyman for Android & Keyman Engine for Android

## Prerequisites

See [build configuration](../docs/build/index.md) for details on how to configure
your build environment.

## Keyman Minimum Android Requirements

Keyman for Android has a minSdkVersion of 21 for [Android 5.0 Lollipop](https://developer.android.com/about/versions/lollipop)

## Keyman for Android Development

Keyman for Android (formerly named KMAPro) can be built from a command line
(preferred) or Android Studio.

Building Keyman Web is a precursor for compiling KMEA, so verify your system has
all the [Minimum Web Compilation Requirements](../web/README.md#minimum-web-compilation-requirements)

When attempting to build via Android Studio the first time, you'll also need to
accept the SDK licenses. Depending on your OS, you may need to run a command
line similar to:

```bash
yes | ~/Library/Android/sdk/tools/bin/sdkmanager --licenses
```

### Crash Reporting

Keyman for Android uses [Sentry](https://sentry.io) for crash reporting. The
analytics for Debug are associated with an App Bundle ID
`com.tavultesoft.kmapro.debug`.

### Compiling From Command Line

1. Launch a command prompt and cd to the directory **keyman/android**
2. Run the top level build script `./build.sh configure build:engine build:app` which will:
    * Compile debug version of KMEA (and its KMW dependency)
    * Download default keyboard and dictionary resources as needed
    * Compile debug version of KMAPro
3. The APK will be found in **keyman/android/KMAPro/kMAPro/build/outputs/apk/debug/keyman-\${version}.apk**
   where `${version}` is the current version number.

### Compiling From Android Studio

1. Ensure that [Keyman Engine for Android](#how-to-build-keyman-engine-for-android) is built.
2. Launch Android Studio and import the Gradle project **keyman/android/KMAPro/build.gradle**
3. From the project view, *configure* anything that Gradle reports.
4. Create a run configuration for kMAPro
    1. Select Run --> Edit Configurations...
    2. Select Add New Configuration (+) --> Android App
    3. Change Module to kMAPro
    4. Name your run configuration kMAPro (or as desired)
5. Run your new configuration: Select Run --> Run 'kMAPro'
6. Select a physical device or create a new virtual device to match your target
   API version.

   For Ubuntu 18.04, you will need to add your user to the `kvm` group
   for permission accessing the emulator.

   ```bash
    sudo apt install qemu-kvm
    sudo adduser <username> kvm
   ```

### Running From Command Line

1. Launch a command prompt
2. Ensure that a physical device is connected or an emulator is running.
    1. To list physical devices: `$ANDROID_HOME/platform-tools/adb.exe devices`
    2. To list created emulator devices: `$ANDROID_HOME/tools/emulator.exe -list-avds`
    3. [Create a new virtual device](https://developer.android.com/studio/run/managing-avds.html)
       if there are no existing devices.
    4. Start an emulator: `$ANDROID_HOME/tools/emulator.exe @nameofemulator`
3. Load the APK: `$ANDROID_HOME/platform-tools/adb.exe install -r path/to/apk.apk`

    * If multiple devices are connected you may need
      `$ANDROID_HOME/platform-tools/adb.exe install -r -s SERIAL path/to/apk.apk`.
      Replace `SERIAL` with the device serial number listed in step 2.

### Compiling the app's offline help
Keyman for Android help is maintained in the Markdown files in android/docs/help.
The script `/resources/build/build-help.inc.sh` uses the `pandoc` tool to convert the Markdown files into html.

```bash
  # Convert markdown to html for offline help
  build_help_html android KMAPro/kMAPro/src/main/assets/info
```

This script is automatically called when Keyman for Android is built.

### Sample Projects

There are two included sample projects that can be modified to test a keyboard.

**android/Samples/KMSample1** app runs a bare Keyman app for testing a keyboard.

**android/Samples/KMSample2** app provides prompts for setting KMSample2 as a system level keyboard.
Both sample apps include a default Tamil keyboard and sample dictionary.

Building the debug versions of these projects follow the same steps as KMAPro:

1. cd to the desired KMSample directory
2. `./build.sh configure build`
3. Open Android Studio to run the app

### Tests: KeyboardHarness

**android/Tests/KeyboardHarness** app is a test harness for developers to troubleshoot keyboards.

1. Copy the keyboard js file and applicable ttf fonts to *android/Tests/KeyboardHarness/app/src/main/assets/*.
2. In Keyman Developer
  * Open the `keyboardharness.kpj` project and add your keyboard files to the keyboard package.
  * Build the keyboardharness.kmp keyboard package
3. Add the keyboard in *android/Tests/KeyboardHarness/app/src/main/java/com/keyman/android/tests/keyboardHarness/MainActivity.java*
4. cd to android/Tests/KeyboardHarness/
5. `./build.sh configure build`
6. Open Android Studio to run the app

--------------------------------------------------------------

## How to Build Keyman Engine for Android
1. Open a terminal or Git Bash prompt and go to the Android project folder (e.g. `cd ~/keyman/android/`)
2. Run `./build.sh build:engine`

Keyman Engine for Android library (**keyman-engine.aar**) is now ready to be imported in any project.

## How to Use Keyman Engine for Android Library

1. Add **keyman-engine.aar** into **[Your project folder]/app/libs/** folder.
    a. We recommend [downloading](https://keyman.com/downloads/#android-engine) the the latest stable release of Keyman Engine and extracting the .aar file.
    b. If you choose to use your own build of the Keyman Engine, get the library from **android/Samples/KMSample1/app/libs/keyman-engine.aar**
2. Open your project in Android Studio.
3. Open **build.gradle** (Module: app) in "Gradle Scripts".
4. Check that the `android{}` object, includes the following:
```gradle
android {
    compileSdkVersion 35

    // Don't compress kmp files so they can be copied via AssetManager
    aaptOptions {
        noCompress "kmp"
    }

    buildFeatures {
        buildConfig = true
    }
```
5. After the `android {}` object, include the following:
````gradle
repositories {
    flatDir {
        dirs 'libs'
    }
    google()
    mavenCentral()
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.7.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.2.1'
    implementation 'com.google.android.material:material:1.12.0'
    api (name:'keyman-engine', ext:'aar')
    implementation 'androidx.preference:preference:1.2.1'

    // Include this if you want to have QR Codes displayed on Keyboard Info
    implementation ('com.github.kenglxn.QRGen:android:3.0.1') {
        transitive = true
    }
}

````
5. include `import com.keyman.engine.*;` to use Keyman Engine in a class.

### Keyman Engine for Android help content
Keyman Engine for Android help is maintained in the Markdown files in android/docs/engine/.

## Design Documentation

Internal design documents about features pertaining to Keyman for Android and Keyman Engine for Android are maintained in the Markdown files in android/docs/internal/.