private void unregisterListener() {
if (mSuperScrollListener != null && mViewTreeObserver != null) {
if (mViewTreeObserver.isAlive()) {
mViewTreeObserver.removeOnScrollChangedListener(mSuperScrollListener);
}
mViewTreeObserver = null;
}
}
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);
}
}
private void registerListener(View anchor) {
if (mSuperScrollListener != null) {
ViewTreeObserver vto =
(anchor.getWindowToken() != null) ? anchor.getViewTreeObserver() : null;
if (vto != mViewTreeObserver) {
if (mViewTreeObserver != null && mViewTreeObserver.isAlive()) {
mViewTreeObserver.removeOnScrollChangedListener(mSuperScrollListener);
}
if ((mViewTreeObserver = vto) != null) {
vto.addOnScrollChangedListener(mSuperScrollListener);
}
}
}
}
public void testAccessOnScrollChangedListener() throws Throwable {
layout(R.layout.scrollview_layout);
final ScrollView scrollView = (ScrollView) mActivity.findViewById(R.id.scroll_view);
mViewTreeObserver = scrollView.getViewTreeObserver();
final MockOnScrollChangedListener listener = new MockOnScrollChangedListener();
assertFalse(listener.hasCalledOnScrollChanged());
mViewTreeObserver.addOnScrollChangedListener(listener);
runTestOnUiThread(
new Runnable() {
@Override
public void run() {
scrollView.fullScroll(View.FOCUS_DOWN);
}
});
mInstrumentation.waitForIdleSync();
new PollingCheck() {
@Override
protected boolean check() {
return listener.hasCalledOnScrollChanged();
}
}.run();
listener.reset();
assertFalse(listener.hasCalledOnScrollChanged());
mViewTreeObserver.removeOnScrollChangedListener(listener);
runTestOnUiThread(
new Runnable() {
@Override
public void run() {
scrollView.fullScroll(View.FOCUS_UP);
}
});
assertFalse(listener.hasCalledOnScrollChanged());
}
package com.actionbarsherlock.internal.widget;
protected void zzb(ViewTreeObserver viewtreeobserver) {
viewtreeobserver.removeOnScrollChangedListener(this);
}
