How to take a screenshot of other app programmatically without root permission, like Screenshot UX Trial?

Question

How to take a screenshot of other app programmatically without root permission, like Screenshot UX Trial?

1. I know I can capture the bitmap of the root view i

Answer 1

I don't think Android will allow you to access another app's frame buffer. This is just part of the security of Android. Each app should keep to its own resources.

If you really need to get a screen capture of any app, I would suggest using the native screen grab "gesture". For the the Nexus 7 for example, simply "... hold the power button and the volume down button at the same time for approximately 2 seconds."

A Google search will usually find the trick with your device.