Daisykit - Android

This is the Android demo app of DaisyKit project. Visit DaisyKit SDK.

I. Build and Run

Dependencies: Android NDK 21.3, CMake 3.10.2.

Step 1: Clone the source code

git clone --recurse-submodules https://github.com/open-daisylab/daisykit-android.git

Or

git clone https://github.com/open-daisylab/daisykit-android.git
cd daisykit-android
git submodule update --init

Step 2: Download NCNN

https://github.com/Tencent/ncnn/releases

• Download ncnn-YYYYMMDD-android-vulkan.zip or build ncnn for android yourself
• Extract ncnn-YYYYMMDD-android-vulkan.zip into app/src/main/jni and change the ncnn_DIR path to yours in app/src/main/jni/CMakeLists.txt

Step 3: Download OpenCV

https://github.com/nihui/opencv-mobile

• Download opencv-mobile-XYZ-android.zip
• Extract opencv-mobile-XYZ-android.zip into app/src/main/jni and change the OpenCV_DIR path to yours in app/src/main/jni/CMakeLists.txt

Step 4: Build

• Open this project with Android Studio, build it and enjoy!

II. Some notes

• Android ndk camera is used for best efficiency.
• Crash may happen on very old devices for lacking HAL3 camera interface.
• All models are manually modified to accept dynamic input shape.
• Most small models run slower on GPU than on CPU, this is common.
• FPS may be lower in dark environment because of longer camera exposure time.

III. Errors and Fixes

1. Errors because of build tool version

No toolchains found in the NDK toolchains folder for ABI with prefix: arm-linux-androideabi

clang ++: error: unknown argument: '-static-openmp'

How to fix? Install NDK 21.3, CMake 3.10.2.

2. Crashing app

See into assets folder at app/src/main/assets. There should be 3 subfolders here: models, configs, and images. Initialize all git submodules.

3. Android debug

Use above snippet to print to logcat.

#include <android/log.h>

#define  LOG_TAG    "testjni"
#define  ALOG(...)  __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)