[移动开发]mediapipe学习-手势识别生成Android版AAR(4)

前言

这章主要讲述 android aar编译
 环境 基于ubuntu18.0.4  （虚拟机上，CPU 能好点最好，不然太慢了）

1: ubuntu18 环境 (ubuntu18 本文简称 u18 ,如果没有权限 自己加 sudo )
官网说的3点注意项
1:
Note: To interoperate with OpenCV, OpenCV 3.x to 4.1 are preferred.
OpenCV 2.x currently works but interoperability support may be deprecated in the future.
2:
Note: If you plan to use TensorFlow calculators and example apps,
there is a known issue with gcc and g++ version 6.3 and 7.3. Please use other versions.
3:
Note: To make Mediapipe work with TensorFlow,
please set Python 3.7 as the default Python version and install the Python “six” library by running pip3 install --user six.

中文大概意思:
1: 推荐 OpenCV 3.x to 4.1
2: 要使用 TensorFlow calculators ，不要使用gcc and g++ version 6.3 and 7.3；使用其他版本
3：设置python3.7 为默认python 版本

先更新下
sudo apt-get update
1> gcc g++ unzip zip
sudo apt-get install gcc g++ unzip zip
default install gcc7.5 g++7.5 (官方网建议不要用6.3 to 7.3)

2>安装python3.7
sudo apt install python3.7
u18 自带 3.6 2.7
cd /usr/bin
sudo rm -f python #这个软链接指向是python2.7

这里 执行创建2个软链接
ln -s pytho3.7 python3 ##创建软链接
ln -s pytho3.7 python ##创建软链接

pip命令行安装
安装: sudo apt install python3-pip
更新：pip3 install --upgrade pip
cd /usr/bin
ln -s pip3 pip
pip install numpy #这个一定要安装
pip3 install --user six. #执行 有不没效果不知道

3>bazel java
下载地址
https://docs.bazel.build/versions/main/install-ubuntu.html#install-with-installer-ubuntu
这里下载的是bazel-5.2.0-linux-x86_64
这里看到

Ubuntu 18.04 (LTS) uses OpenJDK 11 by default:

安装jdk
sudo apt-get install openjdk-11-jdk
所以
cd $HOME
mkdir bin

4>下载android sdk 及mediapipe source
mkdir $HOME/mediapipe_dir
如没安装git 自行安装
git clone https://github.com/google/mediapipe.git
下载 andriod sdk ndk（如果不能 自行其他地方下载）
./setup_android_sdk_and_ndk.sh /home/ubuntu18/mediapipe_dir/Android/Sdk /home/ubuntu18/mediapipe_dir/Android/Ndk r21

5>安装opencv
./setup_opencv.sh
脚本不一定能下载下来，脚本里 只要是这2句下载的，可以自行下载（这里是自行下载的）
git clone https://github.com/opencv/opencv_contrib.git
git clone https://github.com/opencv/opencv.git
下载完了后 把 opencv_contrib opencv
放在 /home/ubuntu18/mediapipe_dir/opencv_dir

再修改setup_opencv.sh
cp -r /home/ubuntu18/mediapipe_dir/opencv_dir/* /tmp/build_opencv
#git clone https://github.com/opencv/opencv_contrib.git
#git clone https://github.com/opencv/opencv.git
sh 执行完后，会自动修改
WORKSPACE 里的
linux_opencv linux_ffmpeg

6>修改环境变量 （这里只改变了本用户，如果想所有用户 自行修改 /etc/profile ）
cd ~
vim .bazelrc #没有执行安装vim 命令 sudo apt-get install vim
export PATH=“$PATH:$HOME/bin”

拷贝bazel-5.2.0-linux-x86_64 到$HOME/bin 中
#创个软链接
ln -s bazel-5.2.0-linux-x86_64 bazel

增加 JAVA_HOME
which javac
symbolic link to /etc/alternatives/javac
file /usr/bin/javac
symbolic link to /etc/alternatives/javac
说明这个软链接
继续file /etc/alternatives/javac
…只要是symbolic link 继续 file …
file /usr/lib/jvm/java-11-openjdk-amd64/bin/javac

要加入的一次发这里 包括后面要配置的Android SDK
export PATH=“$PATH:$HOME/bin”
export JAVA_HOME=“/usr/lib/jvm/java-11-openjdk-amd64”
export PATH=“$PATH:$JAVA_HOME/bin”
export ANDROID_HOME=“$HOME/mediapipe_dir/Android/Sdk”
最后 本章配置的环境变量都在 .bazelrc
source .bazelrc

2：开始编译AAR，按官方的AAR demo来
官网说明
https://google.github.io/mediapipe/getting_started/android_archive_library.html
创建目录
mkdir mediapipe/examples/android/src/java/com/google/mediapipe/apps/aar_example
创建文件
vim mediapipe/examples/android/src/java/com/google/mediapipe/apps/aar_example/BUILD
BUILD 内容

load("//mediapipe/java/com/google/mediapipe:mediapipe_aar.bzl", "mediapipe_aar")

mediapipe_aar(
    name = "mediapipe_face_detection",
    calculators = ["//mediapipe/graphs/face_detection:mobile_calculators"],
)

bazel build -c opt --strip=ALWAYS \
    --host_crosstool_top=@bazel_tools//tools/cpp:toolchain \
    --fat_apk_cpu=arm64-v8a,armeabi-v7a \
    --legacy_whole_archive=0 \
    --features=-legacy_whole_archive \
    --copt=-fvisibility=hidden \
    --copt=-ffunction-sections \
    --copt=-fdata-sections \
    --copt=-fstack-protector \
    --copt=-Oz \
    --copt=-fomit-frame-pointer \
    --copt=-DABSL_MIN_LOG_LEVEL=2 \
    --linkopt=-Wl,--gc-sections,--strip-all \
    //mediapipe/examples/android/src/java/com/google/mediapipe/apps/aar_example:mediapipe_face_detection.aar

虚拟机大概有45G文件，用虚拟机·时准备个大磁盘，
WORKSPACE 文件 内容

workspace(name = "mediapipe")

load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")

http_archive(
    name = "bazel_skylib",
    type = "tar.gz",
    urls = [
        "https://github.com/bazelbuild/bazel-skylib/releases/download/1.0.3/bazel-skylib-1.0.3.tar.gz",
        "https://mirror.bazel.build/github.com/bazelbuild/bazel-skylib/releases/download/1.0.3/bazel-skylib-1.0.3.tar.gz",
    ],
    sha256 = "1c531376ac7e5a180e0237938a2536de0c54d93f5c278634818e0efc952dd56c",
)
load("@bazel_skylib//:workspace.bzl", "bazel_skylib_workspace")
bazel_skylib_workspace()
load("@bazel_skylib//lib:versions.bzl", "versions")
versions.check(minimum_bazel_version = "3.7.2")

# ABSL cpp library lts_2021_03_24, patch 2.
http_archive(
    name = "com_google_absl",
    urls = [
        "https://github.com/abseil/abseil-cpp/archive/refs/tags/20210324.2.tar.gz",
    ],
    # Remove after https://github.com/abseil/abseil-cpp/issues/326 is solved.
    patches = [
        "@//third_party:com_google_absl_f863b622fe13612433fdf43f76547d5edda0c93001.diff"
    ],
    patch_args = [
        "-p1",
    ],
    strip_prefix = "abseil-cpp-20210324.2",
    sha256 = "59b862f50e710277f8ede96f083a5bb8d7c9595376146838b9580be90374ee1f"
)

http_archive(
    name = "rules_cc",
    strip_prefix = "rules_cc-2f8c04c04462ab83c545ab14c0da68c3b4c96191",
# The commit can be updated if the build passes. Last updated 6/23/22.
    urls = [
	"file:///home/ubuntu18/mediapipe_dir/mediapipe_down_package/rules_cc-2f8c04c04462ab83c545ab14c0da68c3b4c96191.zip",
	"https://github.com/bazelbuild/rules_cc/archive/2f8c04c04462ab83c545ab14c0da68c3b4c96191.zip"],
)

http_archive(
   name = "rules_foreign_cc",
   strip_prefix = "rules_foreign_cc-0.1.0",
   url = "https://github.com/bazelbuild/rules_foreign_cc/archive/0.1.0.zip",
   # url = "file:///home/ubuntu18/mediapipe_dir/mediapipe_down_package/rules_foreign_cc-0.1.0.zip",
)

load("@rules_foreign_cc//:workspace_definitions.bzl", "rules_foreign_cc_dependencies")

rules_foreign_cc_dependencies()

# This is used to select all contents of the archives for CMake-based packages to give CMake access to them.
all_content = """filegroup(name = "all", srcs = glob(["**"]), visibility = ["//visibility:public"])"""

# GoogleTest/GoogleMock framework. Used by most unit-tests.
# Last updated 2021-07-02.
http_archive(
    name = "com_google_googletest",
    urls = ["https://github.com/google/googletest/archive/4ec4cd23f486bf70efcc5d2caa40f24368f752e3.zip"],
    strip_prefix = "googletest-4ec4cd23f486bf70efcc5d2caa40f24368f752e3",
    sha256 = "de682ea824bfffba05b4e33b67431c247397d6175962534305136aa06f92e049",
)

# Google Benchmark library v1.6.1 released on 2022-01-10.
http_archive(
    name = "com_google_benchmark",
    urls = ["https://github.com/google/benchmark/archive/refs/tags/v1.6.1.tar.gz"],
    strip_prefix = "benchmark-1.6.1",
    sha256 = "6132883bc8c9b0df5375b16ab520fac1a85dc9e4cf5be59480448ece74b278d4",
    build_file = "@//third_party:benchmark.BUILD",
)

# gflags needed by glog
http_archive(
    name = "com_github_gflags_gflags",
    strip_prefix = "gflags-2.2.2",
    sha256 = "19713a36c9f32b33df59d1c79b4958434cb005b5b47dc5400a7a4b078111d9b5",
    url = "https://github.com/gflags/gflags/archive/v2.2.2.zip",
)

# 2020-08-21
http_archive(
    name = "com_github_glog_glog",
    strip_prefix = "glog-0a2e5931bd5ff22fd3bf8999eb8ce776f159cda6",
    sha256 = "58c9b3b6aaa4dd8b836c0fd8f65d0f941441fb95e27212c5eeb9979cfd3592ab",
    urls = [
        "https://github.com/google/glog/archive/0a2e5931bd5ff22fd3bf8999eb8ce776f159cda6.zip",
    ],
)
http_archive(
    name = "com_github_glog_glog_no_gflags",
    strip_prefix = "glog-0a2e5931bd5ff22fd3bf8999eb8ce776f159cda6",
    sha256 = "58c9b3b6aaa4dd8b836c0fd8f65d0f941441fb95e27212c5eeb9979cfd3592ab",
    build_file = "@//third_party:glog_no_gflags.BUILD",
    urls = [
        "https://github.com/google/glog/archive/0a2e5931bd5ff22fd3bf8999eb8ce776f159cda6.zip",
    ],
    patches = [
        "@//third_party:com_github_glog_glog_9779e5ea6ef59562b030248947f787d1256132ae.diff",
    ],
    patch_args = [
        "-p1",
    ],
)

# easyexif
http_archive(
    name = "easyexif",
    url = "https://github.com/mayanklahiri/easyexif/archive/master.zip",
    strip_prefix = "easyexif-master",
    build_file = "@//third_party:easyexif.BUILD",
)

# libyuv
http_archive(
    name = "libyuv",
    # Error: operand type mismatch for `vbroadcastss' caused by commit 8a13626e42f7fdcf3a6acbb0316760ee54cda7d8.
    urls = ["https://chromium.googlesource.com/libyuv/libyuv/+archive/2525698acba9bf9b701ba6b4d9584291a1f62257.tar.gz"],
    build_file = "@//third_party:libyuv.BUILD",
)

# Note: protobuf-javalite is no longer released as a separate download, it's included in the main Java download.
# ...but the Java download is currently broken, so we use the "source" download.
http_archive(
    name = "com_google_protobuf_javalite",
    sha256 = "87407cd28e7a9c95d9f61a098a53cf031109d451a7763e7dd1253abf8b4df422",
    strip_prefix = "protobuf-3.19.1",
    urls = ["https://github.com/protocolbuffers/protobuf/archive/v3.19.1.tar.gz"],
)

http_archive(
    name = "com_google_protobuf",
    sha256 = "87407cd28e7a9c95d9f61a098a53cf031109d451a7763e7dd1253abf8b4df422",
    strip_prefix = "protobuf-3.19.1",
    urls = ["https://github.com/protocolbuffers/protobuf/archive/v3.19.1.tar.gz"],
    patches = [
        "@//third_party:com_google_protobuf_fixes.diff"
    ],
    patch_args = [
        "-p1",
    ],
)

http_archive(
    name = "com_google_audio_tools",
    strip_prefix = "multichannel-audio-tools-master",
    urls = ["https://github.com/google/multichannel-audio-tools/archive/master.zip"],
)

# 2020-07-09
http_archive(
    name = "pybind11_bazel",
    strip_prefix = "pybind11_bazel-203508e14aab7309892a1c5f7dd05debda22d9a5",
    urls = ["https://github.com/pybind/pybind11_bazel/archive/203508e14aab7309892a1c5f7dd05debda22d9a5.zip"],
    sha256 = "75922da3a1bdb417d820398eb03d4e9bd067c4905a4246d35a44c01d62154d91",
)

# Point to the commit that deprecates the usage of Eigen::MappedSparseMatrix.
http_archive(
    name = "pybind11",
    urls = [
        "https://github.com/pybind/pybind11/archive/70a58c577eaf067748c2ec31bfd0b0a614cffba6.zip",
    ],
    sha256 = "b971842fab1b5b8f3815a2302331782b7d137fef0e06502422bc4bc360f4956c",
    strip_prefix = "pybind11-70a58c577eaf067748c2ec31bfd0b0a614cffba6",
    build_file = "@pybind11_bazel//:pybind11.BUILD",
)

# Point to the commit that deprecates the usage of Eigen::MappedSparseMatrix.
http_archive(
    name = "ceres_solver",
    url = "https://github.com/ceres-solver/ceres-solver/archive/123fba61cf2611a3c8bddc9d91416db26b10b558.zip",
    patches = [
        "@//third_party:ceres_solver_compatibility_fixes.diff"
    ],
    patch_args = [
        "-p1",
    ],
    strip_prefix = "ceres-solver-123fba61cf2611a3c8bddc9d91416db26b10b558",
    sha256 = "8b7b16ceb363420e0fd499576daf73fa338adb0b1449f58bea7862766baa1ac7"
)

http_archive(
    name = "opencv",
    build_file_content = all_content,
    strip_prefix = "opencv-3.4.10",
    urls = ["https://github.com/opencv/opencv/archive/3.4.10.tar.gz"],
)

new_local_repository(
    name = "linux_opencv",
    build_file = "@//third_party:opencv_linux.BUILD",
    path = "/usr/local",
)

new_local_repository(
    name = "linux_ffmpeg",
    build_file = "@//third_party:ffmpeg_linux.BUILD",
    path = "/usr"
)

new_local_repository(
    name = "macos_opencv",
    build_file = "@//third_party:opencv_macos.BUILD",
    # For local MacOS builds, the path should point to an opencv@3 installation.
    # If you edit the path here, you will also need to update the corresponding
    # prefix in "opencv_macos.BUILD".
    path = "/usr/local",
)

new_local_repository(
    name = "macos_ffmpeg",
    build_file = "@//third_party:ffmpeg_macos.BUILD",
    path = "/usr/local/opt/ffmpeg",
)

new_local_repository(
    name = "windows_opencv",
    build_file = "@//third_party:opencv_windows.BUILD",
    path = "C:\\opencv\\build",
)

#http_archive  new_local_repository
http_archive(
    name = "android_opencv",
    build_file = "@//third_party:opencv_android.BUILD",
   # path="/home/ubuntu18/mediapipe_dir/mediapipe_down_package/opencv-3.4.3-android-sdk",
    strip_prefix = "OpenCV-android-sdk",
    type = "zip",
    url = "https://github.com/opencv/opencv/releases/download/3.4.3/opencv-3.4.3-android-sdk.zip",
)

# After OpenCV 3.2.0, the pre-compiled opencv2.framework has google protobuf symbols, which will
# trigger duplicate symbol errors in the linking stage of building a mediapipe ios app.
# To get a higher version of OpenCV for iOS, opencv2.framework needs to be built from source with
# '-DBUILD_PROTOBUF=OFF -DBUILD_opencv_dnn=OFF'.
http_archive(
    name = "ios_opencv",
    sha256 = "7dd536d06f59e6e1156b546bd581523d8df92ce83440002885ec5abc06558de2",
    build_file = "@//third_party:opencv_ios.BUILD",
    type = "zip",
    url = "https://github.com/opencv/opencv/releases/download/3.2.0/opencv-3.2.0-ios-framework.zip",
)

http_archive(
    name = "stblib",
    strip_prefix = "stb-b42009b3b9d4ca35bc703f5310eedc74f584be58",
    sha256 = "13a99ad430e930907f5611325ec384168a958bf7610e63e60e2fd8e7b7379610",
    urls = ["https://github.com/nothings/stb/archive/b42009b3b9d4ca35bc703f5310eedc74f584be58.tar.gz"],
    build_file = "@//third_party:stblib.BUILD",
    patches = [
        "@//third_party:stb_image_impl.diff"
    ],
    patch_args = [
        "-p1",
    ],
)

# iOS basic build deps.

http_archive(
    name = "build_bazel_rules_apple",
    sha256 = "77e8bf6fda706f420a55874ae6ee4df0c9d95da6c7838228b26910fc82eea5a2",
    url = "https://github.com/bazelbuild/rules_apple/releases/download/0.32.0/rules_apple.0.32.0.tar.gz",
    patches = [
        # Bypass checking ios unit test runner when building MP ios applications.
        "@//third_party:build_bazel_rules_apple_bypass_test_runner_check.diff"
    ],
    patch_args = [
        "-p1",
    ],
)

load(
    "@build_bazel_rules_apple//apple:repositories.bzl",
    "apple_rules_dependencies",
)

apple_rules_dependencies()

load(
    "@build_bazel_rules_swift//swift:repositories.bzl",
    "swift_rules_dependencies",
)

swift_rules_dependencies()

http_archive(
    name = "build_bazel_apple_support",
    sha256 = "741366f79d900c11e11d8efd6cc6c66a31bfb2451178b58e0b5edc6f1db17b35",
    urls = [
        "https://github.com/bazelbuild/apple_support/releases/download/0.10.0/apple_support.0.10.0.tar.gz"
    ],
)

load(
    "@build_bazel_apple_support//lib:repositories.bzl",
    "apple_support_dependencies",
)

apple_support_dependencies()

# More iOS deps.

http_archive(
    name = "google_toolbox_for_mac",
    url = "https://github.com/google/google-toolbox-for-mac/archive/v2.2.1.zip",
    sha256 = "e3ac053813c989a88703556df4dc4466e424e30d32108433ed6beaec76ba4fdc",
    strip_prefix = "google-toolbox-for-mac-2.2.1",
    build_file = "@//third_party:google_toolbox_for_mac.BUILD",
)

# Maven dependencies.

RULES_JVM_EXTERNAL_TAG = "4.0"
RULES_JVM_EXTERNAL_SHA = "31701ad93dbfe544d597dbe62c9a1fdd76d81d8a9150c2bf1ecf928ecdf97169"

http_archive(
    name = "rules_jvm_external",
  strip_prefix = "rules_jvm_external-%s" % RULES_JVM_EXTERNAL_TAG,
    sha256 = RULES_JVM_EXTERNAL_SHA,
  url = "https://github.com/bazelbuild/rules_jvm_external/archive/%s.zip" % RULES_JVM_EXTERNAL_TAG,
#	url ="file:///home/ubuntu18/mediapipe_dir/mediapipe_down_package/rules_jvm_external-4.0.zip",
# eh  no modify 
)

load("@rules_jvm_external//:defs.bzl", "maven_install")

# Important: there can only be one maven_install rule. Add new maven deps here.
maven_install(
    artifacts = [
        "androidx.concurrent:concurrent-futures:1.0.0-alpha03",
        "androidx.lifecycle:lifecycle-common:2.3.1",
        "androidx.activity:activity:1.2.2",
        "androidx.exifinterface:exifinterface:1.3.3",
        "androidx.fragment:fragment:1.3.4",
        "androidx.annotation:annotation:aar:1.1.0",
        "androidx.appcompat:appcompat:aar:1.1.0-rc01",
        "androidx.camera:camera-core:1.0.0-beta10",
        "androidx.camera:camera-camera2:1.0.0-beta10",
        "androidx.camera:camera-lifecycle:1.0.0-beta10",
        "androidx.constraintlayout:constraintlayout:aar:1.1.3",
        "androidx.core:core:aar:1.1.0-rc03",
        "androidx.legacy:legacy-support-v4:aar:1.0.0",
        "androidx.recyclerview:recyclerview:aar:1.1.0-beta02",
        "androidx.test.espresso:espresso-core:3.1.1",
        "com.github.bumptech.glide:glide:4.11.0",
        "com.google.android.material:material:aar:1.0.0-rc01",
        "com.google.auto.value:auto-value:1.8.1",
        "com.google.auto.value:auto-value-annotations:1.8.1",
        "com.google.code.findbugs:jsr305:latest.release",
        "com.google.android.datatransport:transport-api:3.0.0",
        "com.google.android.datatransport:transport-backend-cct:3.1.0",
        "com.google.android.datatransport:transport-runtime:3.1.0",
        "com.google.flogger:flogger-system-backend:0.6",
        "com.google.flogger:flogger:0.6",
        "com.google.guava:guava:27.0.1-android",
        "com.google.guava:listenablefuture:1.0",
        "junit:junit:4.12",
        "org.hamcrest:hamcrest-library:1.3",
    ],
    repositories = [
       # "https://maven.google.com",
       # "https://dl.google.com/dl/android/maven2",
       # "https://repo1.maven.org/maven2",
       # "https://jcenter.bintray.com",
	"https://maven.aliyun.com/repository/google",
        "https://maven.aliyun.com/repository/central",
        "https://maven.aliyun.com/repository/public",
    ],
    fetch_sources = True,
    version_conflict_policy = "pinned",
)

# Needed by TensorFlow
http_archive(
    name = "io_bazel_rules_closure",
    sha256 = "e0a111000aeed2051f29fcc7a3f83be3ad8c6c93c186e64beb1ad313f0c7f9f9",
    strip_prefix = "rules_closure-cf1e44edb908e9616030cc83d085989b8e6cd6df",
    urls = [
	"file:///home/ubuntu18/mediapipe_dir/mediapipe_down_package/rules_closure-cf1e44edb908e9616030cc83d085989b8e6cd6df.tar.gz",
        "http://mirror.tensorflow.org/github.com/bazelbuild/rules_closure/archive/cf1e44edb908e9616030cc83d085989b8e6cd6df.tar.gz",
        "https://github.com/bazelbuild/rules_closure/archive/cf1e44edb908e9616030cc83d085989b8e6cd6df.tar.gz",  # 2019-04-04
    ],
)

# Tensorflow repo should always go after the other external dependencies.
# 2022-02-15
_TENSORFLOW_GIT_COMMIT = "a3419acc751dfc19caf4d34a1594e1f76810ec58"
_TENSORFLOW_SHA256 = "b95b2a83632d4055742ae1a2dcc96b45da6c12a339462dbc76c8bca505308e3a"
http_archive(
    name = "org_tensorflow",
    urls = [
      "https://github.com/tensorflow/tensorflow/archive/%s.tar.gz" % _TENSORFLOW_GIT_COMMIT,
    ],
    patches = [
        "@//third_party:org_tensorflow_compatibility_fixes.diff",
        # Diff is generated with a script, don't update it manually.
        "@//third_party:org_tensorflow_custom_ops.diff",
    ],
    patch_args = [
        "-p1",
    ],
    strip_prefix = "tensorflow-%s" % _TENSORFLOW_GIT_COMMIT,
    sha256 = _TENSORFLOW_SHA256,
)

load("@org_tensorflow//tensorflow:workspace3.bzl", "tf_workspace3")
tf_workspace3()
load("@org_tensorflow//tensorflow:workspace2.bzl", "tf_workspace2")
tf_workspace2()

# Edge TPU
http_archive(
  name = "libedgetpu",
  sha256 = "14d5527a943a25bc648c28a9961f954f70ba4d79c0a9ca5ae226e1831d72fe80",
  strip_prefix = "libedgetpu-3164995622300286ef2bb14d7fdc2792dae045b7",
  urls = [
    "https://github.com/google-coral/libedgetpu/archive/3164995622300286ef2bb14d7fdc2792dae045b7.tar.gz"
  ],
)
load("@libedgetpu//:workspace.bzl", "libedgetpu_dependencies")
libedgetpu_dependencies()

load("@coral_crosstool//:configure.bzl", "cc_crosstool")
cc_crosstool(name = "crosstool")

android_sdk_repository(name = "androidsdk", path = "/home/ubuntu18/mediapipe_dir/Android/Sdk")
android_ndk_repository(name = "androidndk", api_level=21, path = "/home/ubuntu18/mediapipe_dir/Android/Ndk/android-ndk-r21")

3:下章讲述 android 调用 aar 生成相应android 工程