下面列出了怎么用android.support.v4.app.FragmentManager.OnBackStackChangedListener的API类实例代码及写法，或者点击链接到github查看源代码。
void reportBackStackChanged() {
if (this.mBackStackChangeListeners != null) {
for (int i = 0; i < this.mBackStackChangeListeners.size(); i++) {
((OnBackStackChangedListener) this.mBackStackChangeListeners.get(i)).onBackStackChanged();
}
}
}
public void addOnBackStackChangedListener(OnBackStackChangedListener listener) {
if (this.mBackStackChangeListeners == null) {
this.mBackStackChangeListeners = new ArrayList();
}
this.mBackStackChangeListeners.add(listener);
}
public void removeOnBackStackChangedListener(OnBackStackChangedListener listener) {
if (this.mBackStackChangeListeners != null) {
this.mBackStackChangeListeners.remove(listener);
}
}