/**
* Helper method that waits until the given Snackbar has been fully dismissed. Note that calling
* this method will reset the currently set {@link Snackbar.Callback}.
*/
public static void waitUntilFullyDismissed(Snackbar snackbar) {
SnackbarDismissedCallback snackbarCallback = new SnackbarDismissedCallback();
snackbar.setCallback(snackbarCallback);
try {
// Register our listener as idling resource so that Espresso waits until the
// the snackbar has been fully dismissed
Espresso.registerIdlingResources(snackbarCallback);
// Mark the callback to require waiting for idle state
snackbarCallback.mNeedsIdle = true;
// Perform a dummy Espresso action that loops until the UI thread is idle. This
// effectively blocks us until the Snackbar has completed its sliding animation.
onView(isRoot()).perform(waitUntilIdle());
snackbarCallback.mNeedsIdle = false;
} finally {
// Unregister our idling resource
Espresso.unregisterIdlingResources(snackbarCallback);
// And remove our tracker listener from Snackbar
snackbar.setCallback(null);
}
}
