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Fixed saving/restoration of scroll position thanks to some code from 

@mfietz, https://github.com/mfietz/AntennaPod/blob/recyclerview/app/src/main/java/de/danoeh/antennapod/fragment/AllEpisodesFragment.java
This commit is contained in:
Tom Hennen 2015-10-23 17:18:18 -04:00
parent 10ee9ba484
commit e555b3f24f
1 changed files with 20 additions and 11 deletions
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31
app/src/main/java/de/danoeh/antennapod/fragment/AllEpisodesFragment.java
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@ -71,8 +71,8 @@ public class AllEpisodesFragment extends Fragment {
private static final int RECENT_EPISODES_LIMIT = 150;
private static final String DEFAULT_PREF_NAME = "PrefAllEpisodesFragment";
private static final String PREF_KEY_LIST_TOP = "list_top";
private static final String PREF_KEY_LIST_SELECTION = "list_selection";
private static final String PREF_SCROLL_POSITION = "scroll_position";
private static final String PREF_SCROLL_OFFSET = "scroll_offset";
private String prefName;
protected RecyclerView listView;
@ -93,7 +93,7 @@ public class AllEpisodesFragment extends Fragment {
private boolean isUpdatingFeeds;
protected Subscription subscription;
private RecyclerView.LayoutManager layoutManager;
private LinearLayoutManager layoutManager;
public AllEpisodesFragment() {
// by default we show all the episodes
@ -163,23 +163,32 @@ public class AllEpisodesFragment extends Fragment {
}
private void saveScrollPosition() {
int firstItem = layoutManager.findFirstVisibleItemPosition();
View firstItemView = layoutManager.findViewByPosition(firstItem);
float topOffset;
if(firstItemView == null) {
topOffset = 0;
} else {
topOffset = firstItemView.getTop();
}
SharedPreferences prefs = getActivity().getSharedPreferences(prefName, Context.MODE_PRIVATE);
SharedPreferences.Editor editor = prefs.edit();
View v = listView.getChildAt(0);
int top = (v == null) ? 0 : (v.getTop() - listView.getPaddingTop());
editor.putInt(PREF_KEY_LIST_SELECTION, listView.getVerticalScrollbarPosition());
editor.putInt(PREF_SCROLL_POSITION, firstItem);
editor.putFloat(PREF_SCROLL_OFFSET, topOffset);
editor.commit();
}
private void restoreScrollPosition() {
SharedPreferences prefs = getActivity().getSharedPreferences(prefName, Context.MODE_PRIVATE);
int listSelection = prefs.getInt(PREF_KEY_LIST_SELECTION, 0);
int top = prefs.getInt(PREF_KEY_LIST_TOP, 0);
if (listSelection > 0 || top > 0) {
listView.scrollToPosition(listSelection);
int position = prefs.getInt(PREF_SCROLL_POSITION, 0);
float offset = prefs.getFloat(PREF_SCROLL_OFFSET, 0.0f);
if (position > 0 || offset > 0) {
layoutManager.scrollToPositionWithOffset(position, (int) offset);
// restore once, then forget
SharedPreferences.Editor editor = prefs.edit();
editor.putInt(PREF_KEY_LIST_SELECTION, 0);
editor.putInt(PREF_SCROLL_POSITION, 0);
editor.putInt(PREF_SCROLL_OFFSET, 0);
editor.commit();
}
}