| # In-App Java Example |
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| This example shows how to write custom java code in `android/app/src` and call it using `jnigen` generated bindings. |
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| #### How to run this example: |
| * Run `flutter run` to run the app. |
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| * To regenerate bindings after changing Java code, run `flutter pub run jnigen --config jnigen.yaml`. This requires at least one APK build to have been run before, so that it's possible for `jnigen` to obtain classpaths of Android Gradle libraries. Therefore, once run `flutter build apk` before generating bindings for the first time, or after a `flutter clean`. |
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| #### General steps |
| These are general steps to integrate Java code into a flutter project using `jnigen`. |
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| * Write Java code in suitable package folder, under `android/` subproject of the flutter app. |
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| * Create A jnigen config like `jnigen.yaml` in this example. |
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| * Generate bindings using jnigen config. |
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| * Add an `externalNativeBuild` to gradle script (see `android/app/build.gradle` in this example). |
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| * Add proguard rules to exclude your custom classes from tree shaking, since they are always accessed reflectively in JNI. |
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| * Build and run the app. |
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