Add NDK to your shell Env. somethings like:

export NDK=/Your-Path/Android/sdk/ndk/20.1.5948944
export PATH=${PATH}:${NDK}

git submodule init
git submodule update

build ffmpeg libs

cd app/src/main/cpp
./build-all.sh

build app apk

./gradlew app:assembleDebug

1. recover '/app/src/main/cpp/ffmpeg/libavutil/mem.c' with '/app/mem.c'

2. rebuild ffmpeg

3. uncomment '//#define NEXT_DETECT_MEMORY' in JNIPlayer.cpp

4. rebuild app