Add doc on building TFLite libraries using Docker

PiperOrigin-RevId: 314424779
Change-Id: I2524a6f75472aecfa429dc21323e275762444c6c

tensorflow/lite/g3doc/guide/android.md

@@ -99,7 +99,60 @@ example, you may be building a custom binary that includes
 [operations selected from TensorFlow](https://www.tensorflow.org/lite/guide/ops_select),
 or you may wish to make local changes to TensorFlow Lite.
 
-#### Install Bazel and Android Prerequisites
+#### Set up build environment using Docker
+
+*   Download the Docker file. By downloading the Docker file, you agree that the
+    following terms of service govern your use thereof:
+
+*By clicking to accept, you hereby agree that all use of the Android Studio and
+Android Native Development Kit will be governed by the Android Software
+Development Kit License Agreement available at
+https://developer.android.com/studio/terms (such URL may be updated or changed
+by Google from time to time).*
+
+{% dynamic if 'tflite-android-tos' in user.acknowledged_walls and request.tld !=
+'cn' %} You can download the Docker file
+<a href="https://raw.githubusercontent.com/tensorflow/tensorflow/master/tensorflow/tools/dockerfiles/tflite-android.Dockerfile">here</a>
+{% dynamic else %} You must acknowledge the terms of service to download the
+file.
+<a class="button button-blue devsite-acknowledgement-link" data-globally-unique-wall-id="tflite-android-tos">Acknowledge</a>
+{% dynamic endif %}
+
+*   You can optionally change the Android SDK or NDK version. Put the downloaded
+    Docker file in an empty folder and build your docker image by running:
+
+```shell
+docker build . -t tflite-builder -f tflite-android.Dockerfile
+```
+
+*   Start the docker container interactively by mounting your current folder to
+    /tmp inside the container (note that /tensorflow_src is the TensorFlow
+    repository inside the container):
+
+```shell
+docker run -it -v $PWD:/tmp tflite-builder bash
+```
+
+If you use PowerShell on Windows, replace "$PWD" with "pwd".
+
+If you would like to use a TensorFlow repository on the host, mount that host
+directory instead (-v hostDir:/tmp).
+
+*   Once you are inside the container, you can run the following to download
+    additional Android tools and libraries (note that you may need to accept the
+    license):
+
+```shell
+android update sdk --no-ui -a --filter tools,platform-tools,android-${ANDROID_API_LEVEL},build-tools-${ANDROID_BUILD_TOOLS_VERSION}’
+```
+
+You can now proceed to the "Build and Install" section. After you are finished
+building the libraries, you can copy them to /tmp inside the container so that
+you can access them on the host.
+
+#### Set up build environment without Docker
+
+##### Install Bazel and Android Prerequisites
 
 Bazel is the primary build system for TensorFlow. To build with it, you must
 have it and the Android NDK and SDK installed on your system.
@@ -114,7 +167,7 @@ have it and the Android NDK and SDK installed on your system.
     [Android Studio](https://developer.android.com/studio/index.html). Build
     tools API >= 23 is the recommended version for building TensorFlow Lite.
 
-#### Configure WORKSPACE and .bazelrc
+##### Configure WORKSPACE and .bazelrc
 
 Run the `./configure` script in the root TensorFlow checkout directory, and
 answer "Yes" when the script asks to interactively configure the `./WORKSPACE`

tensorflow/tools/dockerfiles/tflite-android.Dockerfile

@@ -0,0 +1,33 @@
+FROM tensorflow/tensorflow:devel
+
+ENV ANDROID_DEV_HOME /android
+RUN mkdir -p ${ANDROID_DEV_HOME}
+
+# Install Android SDK.
+ENV ANDROID_SDK_FILENAME tools_r25.2.5-linux.zip
+ENV ANDROID_SDK_URL https://dl.google.com/android/repository/${ANDROID_SDK_FILENAME}
+ENV ANDROID_API_LEVEL 23
+ENV ANDROID_NDK_API_LEVEL 18
+# Build Tools Version liable to change.
+ENV ANDROID_BUILD_TOOLS_VERSION 28.0.0
+ENV ANDROID_SDK_HOME ${ANDROID_DEV_HOME}/sdk
+ENV PATH ${PATH}:${ANDROID_SDK_HOME}/tools:${ANDROID_SDK_HOME}/platform-tools
+RUN cd ${ANDROID_DEV_HOME} && \
+    wget -q ${ANDROID_SDK_URL} && \
+    unzip ${ANDROID_SDK_FILENAME} -d android-sdk-linux && \
+    rm ${ANDROID_SDK_FILENAME} && \
+    bash -c "ln -s ${ANDROID_DEV_HOME}/android-sdk-* ${ANDROID_SDK_HOME}"
+
+# Install Android NDK.
+ENV ANDROID_NDK_FILENAME android-ndk-r17c-linux-x86_64.zip
+ENV ANDROID_NDK_URL https://dl.google.com/android/repository/${ANDROID_NDK_FILENAME}
+ENV ANDROID_NDK_HOME ${ANDROID_DEV_HOME}/ndk
+ENV PATH ${PATH}:${ANDROID_NDK_HOME}
+RUN cd ${ANDROID_DEV_HOME} && \
+    wget -q ${ANDROID_NDK_URL} && \
+    unzip ${ANDROID_NDK_FILENAME} -d ${ANDROID_DEV_HOME} && \
+    rm ${ANDROID_NDK_FILENAME} && \
+    bash -c "ln -s ${ANDROID_DEV_HOME}/android-ndk-* ${ANDROID_NDK_HOME}"
+
+# Make android ndk executable to all users.
+RUN chmod -R go=u ${ANDROID_DEV_HOME}