Android: How can you get framebuffer (screenshot) on rooted device?

Question

I tried :

process = Runtime.getRuntime().exec(\"su -c cat /dev/graphics/fb0 > /sdcard/frame.raw\");
process.waitFor();

but it doesn\'t w

Answer 1

Seems to me like your problem is this sign: >. You cannot redirect output using exec. What you need to do is grab the output stream of the process (which is the input stream for you) and store it to file;

process = Runtime.getRuntime().exec("su -c cat /dev/graphics/fb0");
InputStream is = process.getInputStream();
...