Android screen capture with root (service or background thread ) -

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there app capture screen when shark android phone .

1)when app on active , capture screen without root .

2)when app stack , return home, need root permission capture screen .

i want know implement function 2) root permission .

in mind, root permission means root shell, flush command , exec . confuse how capture screen in shell command .

if have root or shell permission, can use either screenshot or screencap command, reference:

root@android:/system/bin # screenshot -h                                    unknown option -- husage: screenshot [-s soundfile] filename.png    -s: play sound effect signal success    -i: autoincrement avoid overwriting filename.png  root@android:/system/bin # screencap -h                                           usage: screencap [-hp] [-d display-id] [filename]        -h: message        -p: save file png.        -d: specify display id capture, default 0.     if filename ends .png saved png.     if filename not given, results printed stdout.

if device not have these program in native, can write 1 yourself. source code here: https://android.googlesource.com/platform/frameworks/base/+/master/cmds/screencap/screencap.cpp


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