How to identify android phone flip 180 degrees

Question

I need to identify is mobile display faced upside or downside. So how can do that? In the start phone display upside then it down side(display to earth and sky). not rotating the screen by fliping the screen.

Answer 1

Use getRotation method :

http://developer.android.com/reference/android/view/Display.html#getRotation

It will return either of 4 options : ROTATION_0, ROTATION_90, ROTATION_180, ROTATION_270

Answer 2

Register for sensor TYPE_ACCELEROMETER. In the onSensorChanged

if (event.values[2] > 0)
{
    // screen up
}
else
{
    // screen down
}