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# Java
Our Java version should be kept in sync with the version Firefox Android is using.
Update the version number in:
- `docs/building.md`
- `libs/verify-android-ci-environment.sh`
- `taskcluster/docker/linux/Dockerfile`
# Android SDK (Software Development Kit)
The Android SDK is a set of development tools for building Android Apps.
## Compile version
This specifies what we use to build our code.
Keep this in sync with the version Firefox Android is using.
Update the version number in:
* `build.gradle`
* `taskcluster/docker/linux/Dockerfile`
## Target / minimum versions
These control which devices the library is compatible with and control which version-specific features are enabled.
Keep this in sync with the version Firefox Android is using.
Update the version number in:
* `build.gradle`
# Android NDK (Native Development Kit)
The Android NDK is the toolset we use for cross-compiling our Rust code so that Firefox Android can dynamically link to it.
* Update the version number in:
* `build.gradle` (search for `ndkVersion`)
* `taskcluster/docker/linux/Dockerfile` (search for `ANDROID_NDK_VERSION`)
* `components/support/rc_crypto/nss/nss_build_common/src/lib.rs` (search for `ANDROID_NDK_VERSION`)
* Update these docs by replacing the old version with the new one:
* docs/building.md
* docs/howtos/locally-building-jna.md
* These may need updating if the directory structure changed between this version and the last
* `libs/build-android-common.sh`: ensure the paths to the various binaries are correct.
* `components/support/rc_crypto/nss/nss_build_common/src/lib.rs`: search for
`DARWIN_X86_64_LIB_DIR` and `LINUX_X86_64_LIB_DIR`, and ensure that both point to the correct lib directory containing
`libclang_rt.builtins-x86_64-android.a`.