IssueTracker

1. Download and execute Android P (API 27) emulator (build 1)
2. `adb shell`
3. `screencap -p /sdcard/screen.png`

Actual result:
The output of the tool is always an empty PNG file. By omitting the -p option one gets an empty bitmap instead:


127|generic_x86:/sdcard/Download $ cat screen.png                                                                            
?PNG

IHDR8+a?
d??IDATx????????
?ۃCA?_{?????IEND?B`?generic_x86:/sdcard/Download $ which screencap
/system/bin/screencap

We've also been trying to get a screenshot with UIAutomation.takeScreenshot() API, but got exactly the same result - an empty picture.

Expected result:
The screenshot of the current screen should be stored in /sdcard/screen.png file, like it works on Android versions prior to API level 27.