private void initialize() {
mIdMap = new SparseArray<>();
Display display;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
mBackend = new DisplayListenerBackendImpl();
// Make sure the display map contains the built-in primary display.
// The primary display is never removed.
display = getDisplayManager().getDisplay(Display.DEFAULT_DISPLAY);
// Android documentation on Display.DEFAULT_DISPLAY suggests that the above
// method might return null. In that case we retrieve the default display
// from the application context and take it as the primary display.
if (display == null) display = getDefaultDisplayForContext(getContext());
} else {
mBackend = new DisplayListenerAPI16();
display = getDefaultDisplayForContext(getContext());
}
mMainSdkDisplayId = display.getDisplayId();
addDisplay(display); // Note this display is never removed.
mBackend.startListening();
}
/* package */ void stopAccurateListening() {
mBackend.stopAccurateListening();
}
