Hook Android Sytem API related to Text Output

Question

In Windows Programming, if you hook TextOut，ExtTextOut，DrawText，DrawTextEx，PolyTextOut，TabbedTextOut etc, you can almost catch the ouput of any software.

Are there similiar system apis you can hook on Android?

I want to capture the output of some apps.

PS: I have root permission! I have got the target android app.

I can even install it on an android emulator on Windows.

Answer 1

If you have't root permissions, you can do it only for your own processt, his is not system wide. By using android NDK, as in this example, or this