Ubuntu TensorFlow 源碼 Android Demo的編譯運行

一、 安裝 Android 的SDK和NDK

SDK 配置

A:下載

國內下載地址選最新的：
SDK:

https://developer.android.google.cn/studio/index.html
也可以下載一個舊的再update

NDK:

https://developer.android.google.cn/ndk/downloads/index.html

B:解壓 配置環境變量

sudo tar -zxvf android-sdk_r26.0.1-linux.tgz
sudo unzip android-ndk-r14b-linux-x86_64.zip

SDK更新（如果是最新的無需更新）

cd ~/sdk/android-sdk-linux
sudo tools/android update sdk --no-ui

C:配置環境變量

打開.bashrc 最后添加一行（主要更改目錄）

PATH="/home/dyufei/sdk/android-sdk-linux/tools:/home/dyufei/sdk/android-sdk-linux/platform-tools:/home/dyufei/sdk/android-sdk-linux/build-tools:${PATH}"

D: 使環境變量生效

source .bashrc

二、 TensorFlow 源碼下載、配置

源碼的下載、編譯、安裝請參考： http://www.cnblogs.com/dyufei/p/8027517.html

1）下載tensorflow 源碼

git clone https://github.com/tensorflow/tensorflow

2）配置TensorFlow 的WORKSPACE

在 TensorFlow 的根目錄下，找到WORKSPACE，將注釋了的SDK和NDK的部分打開，修改成自己的SDK和JDK的目錄和對應的版本

#Uncomment and update the paths in these entries to build the Android demo.
android_sdk_repository(
    name = "androidsdk",
    api_level = 25,
    # Ensure that you have the build_tools_version below installed in the
    # SDK manager as it updates periodically.
    build_tools_version = "27.0.2",
    # Replace with path to Android SDK on your system
    path = "/home/dyufei/sdk/android-sdk-linux/",
)
 
android_ndk_repository(
    name="androidndk",
    path="/home/dyufei/sdk/android-ndk-r14b/",
    # This needs to be 14 or higher to compile TensorFlow.
    # Please specify API level to >= 21 to build for 64-bit
    # archtectures or the Android NDK will automatically select biggest
    # API level that it supports without notice.
    # Note that the NDK version is not the API level.
api_level=14)

3）編譯Android Demo APK

在 TensorFlow 的根目錄下,執行下面命令編譯：

bazel build //tensorflow/examples/android:tensorflow_demo

編譯完成后生成三個文件：
(在bazel-bin/tensorflow/examples/android/目錄下)

Target //tensorflow/examples/android:tensorflow_demo up-to-date:
bazel-bin/tensorflow/examples/android/tensorflow_demo_deploy.jar
bazel-bin/tensorflow/examples/android/tensorflow_demo_unsigned.apk
bazel-bin/tensorflow/examples/android/tensorflow_demo.apk
INFO: Elapsed time: 201.760s, Critical Path: 69.16s
INFO: Build completed successfully, 784 total actions

4）在手機上運行

好了，大功告成！
將tensorflow_demo.apk 安裝到手機上，看看效果吧