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# TF Lite Android App
## Building in Android Studio with TensorFlow Lite AAR from JCenter.
The build.gradle is configured to use TensorFlow Lite's nightly build.
If you see a build error related to compatibility with Tensorflow Lite's Java API (example: method X is
undefined for type Interpreter), there has likely been a backwards compatible
change to the API. You will need to pull new app code that's compatible with the
nightly build and may need to first wait a few days for our external and internal
code to merge.
## Building from Source with Bazel
1. Follow the [Bazel steps for the TF Demo App](https://github.com/tensorflow/tensorflow/tree/master/tensorflow/examples/android#bazel):
1. [Install Bazel and Android Prerequisites](https://github.com/tensorflow/tensorflow/tree/master/tensorflow/examples/android#install-bazel-and-android-prerequisites).
It's easiest with Android Studio.
- You'll need at least SDK version 23.
- Make sure to install the latest version of Bazel. Some distributions
ship with Bazel 0.5.4, which is too old.
- Bazel requires Android Build Tools `26.0.1` or higher.
- You also need to install the Android Support Repository, available
through Android Studio under `Android SDK Manager -> SDK Tools ->
Android Support Repository`.
2. [Edit your `WORKSPACE`](https://github.com/tensorflow/tensorflow/tree/master/tensorflow/examples/android#edit-workspace)
to add SDK and NDK targets.
NOTE: As long as you have the SDK and NDK installed, the `./configure`
script will create these rules for you. Answer "Yes" when the script asks
to automatically configure the `./WORKSPACE`.
- Make sure the `api_level` in `WORKSPACE` is set to an SDK version that
you have installed.
- By default, Android Studio will install the SDK to `~/Android/Sdk` and
the NDK to `~/Android/Sdk/ndk-bundle`.
2. Build the app with Bazel. The demo needs C++11:
```shell
bazel build -c opt --cxxopt='--std=c++11' \
//tensorflow/contrib/lite/java/demo/app/src/main:TfLiteCameraDemo
```
3. Install the demo on a
[debug-enabled device](https://github.com/tensorflow/tensorflow/tree/master/tensorflow/examples/android#install):
```shell
adb install bazel-bin/tensorflow/contrib/lite/java/demo/app/src/main/TfLiteCameraDemo.apk
```
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