Automatic screen capture for Android

droidcapture.sh

# I needed to automatically caputre screen of a book on an Android device
# The process is to: `screenshot` then `swipe left` for some 1000+ times
# This code can help performing those operations:
# Assuming you have installed and configured `adb`,
# and you are authenticated to execute `adb` commands on the device from a bash script:

# Folder in the device to save screenshots
SAVEDIR="/storage/emulated/0/Download/Book7"

# Specify number of pages
PAGES=7500

for (( c=1; c<=$PAGES; c++ ))
do

# Each screenshot will get an auoatic name + timestamp to easily sort
# e.g. P1689514276.png, P1689514278.png, P1689514279.png ..etc
 adb shell screencap -p $SAVEDIR/M$(date +%s).png

# Swipe left from the middle of the screen approximately
 adb shell input touchscreen swipe 700 700 500 700 100
# Comment previous line and use this instead for RTL
# adb shell input touchscreen swipe 200 700 500 700 100

# Wait 1 second for any possible screen swipe animation
 sleep 1

done

# Alert when done
echo -ne '\007'

# Optional: pull screenshots into the host device
# Notice the same path as above
adb pull $SAVEDIR/.

# Alert again when transfer is done
echo -ne '\007'

# Due to `sleep` I estimate that this operation takes ~1.5 second per page.
# For 7500 pages, it takes ~ 3 hours.