(Deprecated Use Apkmod instead)Tmux-Bunch is a first tool for complete apk modding in TERMUX (included :- decompiling , recompiling , signapk , zipalign)
cd $HOME
apt install axel
axel https://github.com/Hax4us/Tmux-Bunch/releases/download/v2.7/Tmux-Bunch-2.7.tar.gz
tar -xf Tmux-Bunch-2.7.tar.gz
cd Tmux-Bunch
bash setup
tmuxbunch##### For Android = 8.0 (OREO)
cd $HOME
apt install axel
axel https://github.com/Hax4us/Tmux-Bunch/releases/download/v2.7/Tmux-Bunch-2.7-oreo.tar.gz
tar -xf Tmux-Bunch-2.7-oreo.tar.gz
cd Tmux-Bunch
bash setup
tmuxbunch
cp /path/to/fb_lite.apk $HOME/Tmux-Bunch/decompiler
tmuxbunch.
tmuxbunch
tmuxbunch.
Using this ....You can play with apks source codes and also you can bind payloads with any apk.