public void tearDownListener() {
final ViewTreeObserver viewTreeObserver = mView.getViewTreeObserver();
if (viewTreeObserver != null) {
viewTreeObserver.removeGlobalOnLayoutListener(this);
viewTreeObserver.removeOnGlobalFocusChangeListener(this);
viewTreeObserver.removeOnPreDrawListener(this);
viewTreeObserver.removeOnScrollChangedListener(this);
viewTreeObserver.removeOnTouchModeChangeListener(this);
}
}
void clearCallbacksAndListener() {
// Keep a reference to the layout listener and remove it here
// rather than having the observer remove itself because the observer
// we add the listener to will be almost immediately merged into
// another observer and will therefore never be alive. If we instead
// keep a reference to the listener and remove it here, we get the
// current view tree observer and should succeed.
ViewTreeObserver observer = view.getViewTreeObserver();
if (observer.isAlive()) {
observer.removeOnPreDrawListener(layoutListener);
}
layoutListener = null;
cbs.clear();
}
private void a() {
if (b.isEmpty()) {}
int i;
int j;
do {
return;
i = c();
j = b();
} while ((!a(i)) || (!a(j)));
a(i, j);
ViewTreeObserver localViewTreeObserver = a.getViewTreeObserver();
if (localViewTreeObserver.isAlive()) {
localViewTreeObserver.removeOnPreDrawListener(c);
}
c = null;
}
public void testRemoveOnPreDrawListener() {
final LinearLayout layout = (LinearLayout) mActivity.findViewById(R.id.linearlayout);
mViewTreeObserver = layout.getViewTreeObserver();
MockOnPreDrawListener listener = new MockOnPreDrawListener();
assertFalse(listener.hasCalledOnPreDraw());
mViewTreeObserver.addOnPreDrawListener(listener);
mViewTreeObserver.dispatchOnPreDraw();
assertTrue(listener.hasCalledOnPreDraw());
listener.reset();
assertFalse(listener.hasCalledOnPreDraw());
mViewTreeObserver.removeOnPreDrawListener(listener);
mViewTreeObserver.dispatchOnPreDraw();
assertFalse(listener.hasCalledOnPreDraw());
}
/** Stop receiving onPreDraw() notifications. */
private void unregisterPreDrawListener() {
if (mViewTreeObserver != null && mViewTreeObserver.isAlive()) {
mViewTreeObserver.removeOnPreDrawListener(this);
}
mViewTreeObserver = null;
}
