Use virtual displays to record app activity. about grafika

[fadden]

It is possible for an app to record itself using the Presentation API to render on a virtual display. You can only record what the app draws, however, not the parts the system draws (like the status bar or nav bar).

Some links in the answer to http://stackoverflow.com/questions/26941104/screen-capture-of-external-display-on-android/ may be useful if you want to go that route. I've updated the bigflake page.

[rishi-rranjan]

HI Andy,
Thanks for the input. This worked but after playing around
with the code, I figured out that the H.264 HW codec even on Samsung Galaxy
S5 only encode in High profile level 1.3. With VP8 codec(S5 has HW encoder)
FPS goes down to 10 even if target bit rate is 1Mbps.

I wanted to display the captured data on chromecast in real time but I am
guessing it's not possible for now with current capabilities of HW
encoders.

Thanks,
Rishi

On Sun, Nov 30, 2014 at 8:59 AM, Andy McFadden [email protected]
wrote:

It is possible for an app to record itself using the Presentation API to
render on a virtual display. You can only record what the app draws,
however, not the parts the system draws (like the status bar or nav bar).

Some links in the answer to
http://stackoverflow.com/questions/26941104/screen-capture-of-external-display-on-android/
may be useful if you want to go that route. I've updated the bigflake page.

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[omerjerk]

Can anyone tell how to exactly use the Presentation API to record the app activity?

I have created a VirtualDisplay which takes a Surface from a SurfaceView.

I understand that I need to use the Presentation API to render on this VirtualDisplay. However I am not really getting it. Any tips?

[claywilkinson]

@omerjerk - I added a Screen recording activity sample to show how to use it.