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I've noticed that occasionally, I will see a red border appear briefly while using the Android emulator (API level 15). It seems to sometimes occur when switching between applications or unlocking the device, but a surefire way to make it appear is by opening the Camera app:
I can occasionally also invoke this behavior when opening the Messaging app:
What does it mean?
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This is caused by the strict mode setting under the developer options. It flashes a red border around the screen when anything does a long operation on the main thread.
If the Android Emulator does not start properly, this problem is often related to discovering that your application's minimum SDK is higher than your emulator SDK. If that's not the case, make sure you have HAXM installer on your SDK Manager.
To stop a running emulator, click Menu and select Stop. To clear the data for an emulator, select Wipe Data.
This is also available on ICS hardware (Settings > Developer > Strict mode enabled). It is indicating that whatever is in the foreground is consuming excessive time on the main application thread of its process.
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