Add third party tools for java and android build.

.bazelrc

@@ -0,0 +1,66 @@
+# This file is based on tensorflow's (v2.2.0) .bazelrc found here:
+# https://github.com/tensorflow/tensorflow/blob/v2.2.0/.bazelrc
+
+# Sets the default Apple platform to macOS.
+
+build --apple_platform_type=macos
+
+# Enable using platform specific build settings
+build --enable_platform_specific_config
+
+# Flag to enable remote config. Required starting from TF 2.2.
+common --experimental_repo_remote_exec
+
+# For workaround https://github.com/bazelbuild/bazel/issues/8772 with Bazel >= 0.29.1
+build --java_toolchain=//third_party/toolchains/java:tf_java_toolchain
+build --host_java_toolchain=//third_party/toolchains/java:tf_java_toolchain
+
+# Suppress C++ compiler warnings, otherwise build logs become 10s of MBs.
+build:android --copt=-w
+build:linux --copt=-w
+build:macos --copt=-w
+build:windows --copt=/w
+
+# Android workspace configurations. Should be replaced by an interative configure in the future.
+build --action_env ANDROID_NDK_HOME
+build --action_env ANDROID_NDK_API_LEVEL
+build --action_env ANDROID_BUILD_TOOLS_VERSION
+build --action_env ANDROID_SDK_API_LEVEL
+build --action_env ANDROID_SDK_HOME
+
+# Android configs. Bazel needs to have --cpu and --fat_apk_cpu both set to the
+# target CPU to build transient dependencies correctly. See
+# https://docs.bazel.build/versions/master/user-manual.html#flag--fat_apk_cpu
+
+build:android --crosstool_top=//external:android/crosstool
+build:android --host_crosstool_top=@bazel_tools//tools/cpp:toolchain
+build:android_arm --config=android
+build:android_arm --cpu=armeabi-v7a
+build:android_arm --fat_apk_cpu=armeabi-v7a
+build:android_arm64 --config=android
+build:android_arm64 --cpu=arm64-v8a
+build:android_arm64 --fat_apk_cpu=arm64-v8a
+build:android_x86 --config=android
+build:android_x86 --cpu=x86
+build:android_x86 --fat_apk_cpu=x86
+build:android_x86_64 --config=android
+build:android_x86_64 --cpu=x86_64
+build:android_x86_64 --fat_apk_cpu=x86_64
+
+# By default, build TF in C++ 14 mode.
+build:android --cxxopt=-std=c++14
+build:android --host_cxxopt=-std=c++14
+build:ios --cxxopt=-std=c++14
+build:ios --host_cxxopt=-std=c++14
+build:linux --cxxopt=-std=c++14
+build:linux --host_cxxopt=-std=c++14
+build:macos --cxxopt=-std=c++14
+build:macos --host_cxxopt=-std=c++14
+build:windows --cxxopt=/std:c++14
+build:windows --host_cxxopt=/std:c++14
+
+# Config to use a mostly-static build and disable modular op registration
+# support (this will revert to loading TensorFlow with RTLD_GLOBAL in Python).
+# By default, TensorFlow will build with a dependence on
+# //tensorflow:libtensorflow_framework.so.
+build:monolithic --define framework_shared_object=false

README.md

@@ -37,3 +37,14 @@ TFLite Support targets at:
     structures to perform pre/post processing and data conversion. It is also
     designed to match the behavior of TensorFlow modules, such as TF.Image and
     TF.text, ensuring consistency from training to inferencing.
+
+## Build Instructions
+
+We use Bazel to build the project. When you're building the Java (Android)
+Utils, you need to set up following env variables correctly:
+
+*   `ANDROID_NDK_HOME`
+*   `ANDROID_SDK_HOME`
+*   `ANDROID_NDK_API_LEVEL`
+*   `ANDROID_SDK_API_LEVEL`
+*   `ANDROID_BUILD_TOOLS_VERSION`

WORKSPACE

@@ -0,0 +1,41 @@
+workspace(name = "org_tensorflow_lite_support")
+
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+http_archive(
+    name = "io_bazel_rules_closure",
+    sha256 = "5b00383d08dd71f28503736db0500b6fb4dda47489ff5fc6bed42557c07c6ba9",
+    strip_prefix = "rules_closure-308b05b2419edb5c8ee0471b67a40403df940149",
+    urls = [
+        "https://storage.googleapis.com/mirror.tensorflow.org/github.com/bazelbuild/rules_closure/archive/308b05b2419edb5c8ee0471b67a40403df940149.tar.gz",
+        "https://github.com/bazelbuild/rules_closure/archive/308b05b2419edb5c8ee0471b67a40403df940149.tar.gz",  # 2019-06-13
+    ],
+)
+
+http_archive(
+    name = "org_tensorflow",
+    strip_prefix = "tensorflow-2.2.0",
+    sha256 = "fd3e6580cfe2035aa80d569b76bba5f33119362907f3d77039b6bedf76172712",
+    urls = [
+        "https://github.com/tensorflow/tensorflow/archive/v2.2.0.zip"
+    ],
+)
+
+# Configure TF.
+load("@org_tensorflow//tensorflow:workspace.bzl", "tf_workspace")
+
+tf_workspace(tf_repo_name="@org_tensorflow")
+
+load("//third_party/tensorflow:tf_configure.bzl", "tf_configure")
+
+tf_configure(name = "local_config_tf")
+
+
+# Configure Android.
+load("//third_party/android:android_configure.bzl", "android_configure")
+
+android_configure(name="local_config_android")
+
+load("@local_config_android//:android.bzl", "android_workspace")
+
+android_workspace()

tensorflow_lite_support/java/AndroidManifest.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="org.tensorflow.lite.support">
+  <uses-sdk android:minSdkVersion="19" android:targetSdkVersion="29"/>
+</manifest>

tensorflow_lite_support/java/BUILD

@@ -0,0 +1,18 @@
+# Description:
+# TensorFlow Lite Support API in Java.
+
+load("@build_bazel_rules_android//android:rules.bzl", "android_library")
+
+package(
+    default_visibility = ["//visibility:public"],
+    licenses = ["notice"],  # Apache 2.0
+)
+
+android_library(
+    name = "tensorflow-lite-support",
+    srcs = [],
+    manifest = "AndroidManifest.xml",
+    deps = [
+        "@org_tensorflow//tensorflow/lite/java:tensorflowlite",
+    ],
+)

tensorflow_lite_support/opensource/opensource_only.files

@@ -0,0 +1,6 @@
+tensorflow_lite_support/opensource/WORKSPACE
+tensorflow_lite_support/third_party/android/BUILD
+tensorflow_lite_support/third_party/android/android.bzl.tpl
+tensorflow_lite_support/third_party/android/android_configure.BUILD.tpl
+tensorflow_lite_support/third_party/android/android_configure.bzl
+tensorflow_lite_support/third_party/toolchains/java/BUILD

third_party/android/BUILD

@@ -0,0 +1 @@
+# Placeholder to make bazel treat it as a package.

third_party/android/android.bzl.tpl

@@ -0,0 +1,9 @@
+"""Set up configurable Android SDK and NDK dependencies."""
+
+def android_workspace():
+  # String for replacement in Bazel template.
+  # These will either be replaced by android_sdk_repository if various ENV
+  # variables are set when `local_config_android` repo_rule is run, or they
+  # will be replaced by noops otherwise.
+  MAYBE_ANDROID_SDK_REPOSITORY
+  MAYBE_ANDROID_NDK_REPOSITORY

third_party/android/android_configure.bzl

@@ -0,0 +1,95 @@
+"""Repository rule for Android SDK and NDK autoconfiguration.
+
+`android_configure` depends on the following environment variables:
+
+  * `ANDROID_NDK_HOME`: Location of Android NDK root.
+  * `ANDROID_SDK_HOME`: Location of Android SDK root.
+  * `ANDROID_SDK_API_LEVEL`: Desired Android SDK API version.
+  * `ANDROID_NDK_API_LEVEL`: Desired Android NDK API version.
+  * `ANDROID_BUILD_TOOLS_VERSION`: Desired Android build tools version.
+
+
+Writes Android SDK and NDK rules.
+
+Add the following to your WORKSPACE FILE:
+
+```python
+android_configure(name = "local_config_android")
+```
+
+Args:
+  name: A unique name for this workspace rule.
+"""
+
+_ANDROID_NDK_HOME = "ANDROID_NDK_HOME"
+_ANDROID_SDK_HOME = "ANDROID_SDK_HOME"
+_ANDROID_NDK_API_VERSION = "ANDROID_NDK_API_LEVEL"
+_ANDROID_SDK_API_VERSION = "ANDROID_SDK_API_LEVEL"
+_ANDROID_BUILD_TOOLS_VERSION = "ANDROID_BUILD_TOOLS_VERSION"
+
+_ANDROID_SDK_REPO_TEMPLATE = """
+    native.android_sdk_repository(
+        name="androidsdk",
+        path="%s",
+        api_level=%s,
+        build_tools_version="%s",
+    )
+"""
+
+_ANDROID_NDK_REPO_TEMPLATE = """
+    native.android_ndk_repository(
+        name="androidndk",
+        path="%s",
+        api_level=%s,
+    )
+"""
+
+def _android_autoconf_impl(repository_ctx):
+    """Implementation of the android_autoconf repository rule."""
+    sdk_home = repository_ctx.os.environ.get(_ANDROID_SDK_HOME)
+    sdk_api_level = repository_ctx.os.environ.get(_ANDROID_SDK_API_VERSION)
+    build_tools_version = repository_ctx.os.environ.get(
+        _ANDROID_BUILD_TOOLS_VERSION,
+    )
+    ndk_home = repository_ctx.os.environ.get(_ANDROID_NDK_HOME)
+    ndk_api_level = repository_ctx.os.environ.get(_ANDROID_NDK_API_VERSION)
+
+    sdk_rule = ""
+    if all([sdk_home, sdk_api_level, build_tools_version]):
+        sdk_rule = _ANDROID_SDK_REPO_TEMPLATE % (
+            sdk_home,
+            sdk_api_level,
+            build_tools_version,
+        )
+
+    ndk_rule = ""
+    if all([ndk_home, ndk_api_level]):
+        ndk_rule = _ANDROID_NDK_REPO_TEMPLATE % (ndk_home, ndk_api_level)
+
+    if ndk_rule == "" and sdk_rule == "":
+        sdk_rule = "pass"
+        # TODO(xunkai): Add interactive configure script.
+
+    repository_ctx.template(
+        "BUILD",
+        Label("//third_party/android:android_configure.BUILD.tpl"),
+    )
+    repository_ctx.template(
+        "android.bzl",
+        Label("//third_party/android:android.bzl.tpl"),
+        substitutions = {
+            "MAYBE_ANDROID_SDK_REPOSITORY": sdk_rule,
+            "MAYBE_ANDROID_NDK_REPOSITORY": ndk_rule,
+        },
+    )
+
+android_configure = repository_rule(
+    implementation = _android_autoconf_impl,
+    environ = [
+        _ANDROID_SDK_API_VERSION,
+        _ANDROID_NDK_API_VERSION,
+        _ANDROID_BUILD_TOOLS_VERSION,
+        _ANDROID_NDK_HOME,
+        _ANDROID_SDK_HOME,
+    ],
+)

third_party/tensorflow/BUILD

@@ -0,0 +1 @@
+# placeholder to make the directory a bazel package.

third_party/tensorflow/BUILD.tpl

@@ -0,0 +1,18 @@
+package(default_visibility = ["//visibility:public"])
+
+cc_library(
+    name = "tf_header_lib",
+    hdrs = [":tf_header_include"],
+    includes = ["include"],
+    visibility = ["//visibility:public"],
+)
+
+cc_library(
+    name = "libtensorflow_framework",
+    srcs = [":libtensorflow_framework_so"],
+    visibility = ["//visibility:public"],
+)
+
+%{TF_HEADER_GENRULE}
+%{TF_SHARED_LIBRARY_GENRULE}
+