下面列出了怎么用android.widget.SectionIndexer的API类实例代码及写法，或者点击链接到github查看源代码。
public int getSectionForPosition(int position) {
int section = 0;
int size;
for (Iterator i$ = this.getPieces().iterator(); i$.hasNext(); position -= size) {
ListAdapter piece = (ListAdapter) i$.next();
size = piece.getCount();
if (position < size) {
if (piece instanceof SectionIndexer) {
return section + ((SectionIndexer) piece).getSectionForPosition(position);
}
return 0;
}
if (piece instanceof SectionIndexer) {
Object[] sections = ((SectionIndexer) piece).getSections();
if (sections != null) {
section += sections.length;
}
}
}
return 0;
}
public Object[] getSections() {
ArrayList sections = new ArrayList();
Iterator i$ = this.getPieces().iterator();
while (i$.hasNext()) {
ListAdapter piece = (ListAdapter) i$.next();
if (piece instanceof SectionIndexer) {
Object[] curSections = ((SectionIndexer) piece).getSections();
if (curSections != null) {
Collections.addAll(sections, curSections);
}
}
}
if (sections.size() == 0) {
return new String[0];
} else {
return sections.toArray(new Object[sections.size()]);
}
}
int findCurrentSectionPosition(int fromPosition) {
ListAdapter adapter = getAdapter();
if (fromPosition >= adapter.getCount()) return -1; // dataset has changed, no candidate
if (adapter instanceof SectionIndexer) {
// try fast way by asking section indexer
SectionIndexer indexer = (SectionIndexer) adapter;
int sectionPosition = indexer.getSectionForPosition(fromPosition);
int itemPosition = indexer.getPositionForSection(sectionPosition);
int typeView = adapter.getItemViewType(itemPosition);
if (isItemViewTypePinned(adapter, typeView)) {
return itemPosition;
} // else, no luck
}
// try slow way by looking through to the next section item above
for (int position = fromPosition; position >= 0; position--) {
int viewType = adapter.getItemViewType(position);
if (isItemViewTypePinned(adapter, viewType)) return position;
}
return -1; // no candidate found
}
int findCurrentSectionPosition(int fromPosition) {
ListAdapter adapter = getAdapter();
if (adapter instanceof SectionIndexer) {
// try fast way by asking section indexer
SectionIndexer indexer = (SectionIndexer) adapter;
int sectionPosition = indexer.getSectionForPosition(fromPosition);
int itemPosition = indexer.getPositionForSection(sectionPosition);
int typeView = adapter.getItemViewType(itemPosition);
if (isItemViewTypePinned(adapter, typeView)) {
return itemPosition;
} // else, no luck
}
// try slow way by looking through to the next section item above
for (int position = fromPosition; position >= 0; position--) {
int viewType = adapter.getItemViewType(position);
if (isItemViewTypePinned(adapter, viewType)) return position;
}
return -1; // no candidate found
}
int findCurrentSectionPosition(int fromPosition) {
ListAdapter adapter = getAdapter();
if (adapter instanceof SectionIndexer) {
// try fast way by asking section indexer
SectionIndexer indexer = (SectionIndexer) adapter;
int sectionPosition = indexer.getSectionForPosition(fromPosition);
int itemPosition = indexer.getPositionForSection(sectionPosition);
int typeView = adapter.getItemViewType(itemPosition);
if (isItemViewTypePinned(adapter, typeView)) {
return itemPosition;
} // else, no luck
}
// try slow way by looking through to the next section item above
for (int position = fromPosition; position >= 0; position--) {
int viewType = adapter.getItemViewType(position);
if (isItemViewTypePinned(adapter, viewType)) return position;
}
return -1; // no candidate found
}
@Override
public int getPositionForSection(int section) {
int position=0;
for (ListAdapter piece : getPieces()) {
if (piece instanceof SectionIndexer) {
Object[] sections=((SectionIndexer)piece).getSections();
int numSections=0;
if (sections != null) {
numSections=sections.length;
}
if (section < numSections) {
return(position + ((SectionIndexer)piece).getPositionForSection(section));
}
else if (sections != null) {
section-=numSections;
}
}
position+=piece.getCount();
}
return(0);
}
@Override
public Object[] getSections() {
ArrayList<Object> sections=new ArrayList<Object>();
for (ListAdapter piece : getPieces()) {
if (piece instanceof SectionIndexer) {
Object[] curSections=((SectionIndexer)piece).getSections();
if (curSections != null) {
Collections.addAll(sections, curSections);
}
}
}
if (sections.size() == 0) {
return(new String[0]);
}
return(sections.toArray(new Object[0]));
}
int findCurrentSectionPosition(int fromPosition) {
ListAdapter adapter = getAdapter();
if (adapter instanceof SectionIndexer) {
// try fast way by asking section indexer
SectionIndexer indexer = (SectionIndexer) adapter;
int sectionPosition = indexer.getSectionForPosition(fromPosition);
int itemPosition = indexer.getPositionForSection(sectionPosition);
int typeView = adapter.getItemViewType(itemPosition);
if (isItemViewTypePinned(adapter, typeView)) {
return itemPosition;
} // else, no luck
}
// try slow way by looking through to the next section item above
for (int position=fromPosition; position>=0; position--) {
int viewType = adapter.getItemViewType(position);
if (isItemViewTypePinned(adapter, viewType)) return position;
}
return -1; // no candidate found
}
int findCurrentSectionPosition(int fromPosition) {
ListAdapter adapter = getAdapter();
if (adapter instanceof SectionIndexer) {
// try fast way by asking section indexer
SectionIndexer indexer = (SectionIndexer) adapter;
int sectionPosition = indexer.getSectionForPosition(fromPosition);
int itemPosition = indexer.getPositionForSection(sectionPosition);
int typeView = adapter.getItemViewType(itemPosition);
if (isItemViewTypePinned(adapter, typeView)) {
return itemPosition;
} // else, no luck
}
// try slow way by looking through to the next section item above
for (int position=fromPosition; position>=0; position--) {
int viewType = adapter.getItemViewType(position);
if (isItemViewTypePinned(adapter, viewType)) return position;
}
return -1; // no candidate found
}
public final int getPositionForSection(int section) {
int position = 0;
for (ListAdapter piece : pieces) {
if (piece instanceof SectionIndexer) {
Object[] sections = ((SectionIndexer) piece).getSections();
int numSections = 0;
if (sections != null) {
numSections = sections.length;
}
if (section < numSections) {
return (position + ((SectionIndexer) piece).getPositionForSection(section));
} else if (sections != null) {
section -= numSections;
}
}
position += piece.getCount();
}
return (0);
}
public final Object[] getSections() {
ArrayList<Object> sections = new ArrayList<Object>();
for (ListAdapter piece : pieces) {
if (piece instanceof SectionIndexer) {
Object[] curSections = ((SectionIndexer) piece).getSections();
if (curSections != null) {
for (Object section : curSections) {
sections.add(section);
}
}
}
}
if (sections.size() == 0) {
return (null);
}
return (sections.toArray(new Object[0]));
}
int findCurrentSectionPosition(int fromPosition) {
ListAdapter adapter = getAdapter();
if (adapter instanceof SectionIndexer) {
// try fast way by asking section indexer
SectionIndexer indexer = (SectionIndexer) adapter;
int sectionPosition = indexer.getSectionForPosition(fromPosition);
int itemPosition = indexer.getPositionForSection(sectionPosition);
int typeView = adapter.getItemViewType(itemPosition);
if (isItemViewTypePinned(adapter, typeView)) {
return itemPosition;
} // else, no luck
}
// try slow way by looking through to the next section item above
for (int position=fromPosition; position>=0; position--) {
int viewType = adapter.getItemViewType(position);
if (isItemViewTypePinned(adapter, viewType)) return position;
}
return -1; // no candidate found
}
public int getPositionForSection(int section) {
int position = 0;
for (ListAdapter piece : pieces) {
if (piece instanceof SectionIndexer) {
Object[] sections = ((SectionIndexer) piece).getSections();
int numSections = 0;
if (sections != null) {
numSections = sections.length;
}
if (section < numSections) {
return (position + ((SectionIndexer) piece)
.getPositionForSection(section));
} else if (sections != null) {
section -= numSections;
}
}
position += piece.getCount();
}
return 0;
}
public Object[] getSections() {
ArrayList<Object> sections = new ArrayList<>();
for (ListAdapter piece : pieces) {
if (piece instanceof SectionIndexer) {
Object[] curSections = ((SectionIndexer) piece).getSections();
if (curSections != null) {
Collections.addAll(sections, curSections);
}
}
}
if (sections.isEmpty()) {
return null;
}
return sections.toArray(new Object[sections.size()]);
}
int findCurrentSectionPosition(int fromPosition) {
ListAdapter adapter = getAdapter();
if (adapter instanceof SectionIndexer) {
// try fast way by asking section indexer
SectionIndexer indexer = (SectionIndexer) adapter;
int sectionPosition = indexer.getSectionForPosition(fromPosition);
int itemPosition = indexer.getPositionForSection(sectionPosition);
int typeView = adapter.getItemViewType(itemPosition);
if (isItemViewTypePinned(adapter, typeView)) {
return itemPosition;
} // else, no luck
}
// try slow way by looking through to the next section item above
for (int position=fromPosition; position>=0; position--) {
int viewType = adapter.getItemViewType(position);
if (isItemViewTypePinned(adapter, viewType)) return position;
}
return -1; // no candidate found
}
private AdapterWrapper wrapAdapter(ListAdapter adapter) {
AdapterWrapper wrapper;
if (adapter instanceof SectionIndexer) {
wrapper = new SectionIndexerAdapterWrapper(getContext(), (StickyListHeadersAdapter) adapter);
} else {
wrapper = new AdapterWrapper(getContext(), (StickyListHeadersAdapter) adapter);
}
wrapper.setDivider(this.mDivider);
wrapper.setDividerHeight(this.mDividerHeight);
wrapper.registerDataSetObserver(this.mDataSetChangedObserver);
wrapper.setOnHeaderClickListener(this.mAdapterHeaderClickListener);
return wrapper;
}
public void setAdapter(StickyListHeadersAdapter adapter) {
if (adapter == null) {
if (mAdapter instanceof SectionIndexerAdapterWrapper) {
((SectionIndexerAdapterWrapper) mAdapter).mSectionIndexerDelegate = null;
}
if (mAdapter != null) {
mAdapter.mDelegate = null;
}
mList.setAdapter(null);
clearHeader();
return;
}
if (mAdapter != null) {
mAdapter.unregisterDataSetObserver(mDataSetObserver);
}
if (adapter instanceof SectionIndexer) {
mAdapter = new SectionIndexerAdapterWrapper(getContext(), adapter);
} else {
mAdapter = new AdapterWrapper(getContext(), adapter);
}
mDataSetObserver = new AdapterWrapperDataSetObserver();
mAdapter.registerDataSetObserver(mDataSetObserver);
if (mOnHeaderClickListener != null) {
mAdapter.setOnHeaderClickListener(new AdapterWrapperHeaderClickHandler());
} else {
mAdapter.setOnHeaderClickListener(null);
}
mAdapter.setDivider(mDivider, mDividerHeight);
mList.setAdapter(mAdapter);
clearHeader();
}
public void setAdapter(StickyListHeadersAdapter adapter) {
if (adapter == null) {
if (mAdapter instanceof SectionIndexerAdapterWrapper) {
((SectionIndexerAdapterWrapper) mAdapter).mSectionIndexerDelegate = null;
}
if (mAdapter != null) {
mAdapter.mDelegate = null;
}
mList.setAdapter(null);
clearHeader();
return;
}
if (mAdapter != null) {
mAdapter.unregisterDataSetObserver(mDataSetObserver);
}
if (adapter instanceof SectionIndexer) {
mAdapter = new SectionIndexerAdapterWrapper(getContext(), adapter);
} else {
mAdapter = new AdapterWrapper(getContext(), adapter);
}
mDataSetObserver = new AdapterWrapperDataSetObserver();
mAdapter.registerDataSetObserver(mDataSetObserver);
if (mOnHeaderClickListener != null) {
mAdapter.setOnHeaderClickListener(new AdapterWrapperHeaderClickHandler());
} else {
mAdapter.setOnHeaderClickListener(null);
}
mAdapter.setDivider(mDivider, mDividerHeight);
mList.setAdapter(mAdapter);
clearHeader();
}
public void setAdapter(RecyclerView.Adapter adapter) {
if (adapter instanceof SectionIndexer) {
adapter.registerAdapterDataObserver(this);
mIndexer = (SectionIndexer) adapter;
mSections = (String[]) mIndexer.getSections();
}
}
public void setAdapter(StickyListHeadersAdapter adapter) {
if (adapter == null) {
if (mAdapter instanceof SectionIndexerAdapterWrapper) {
((SectionIndexerAdapterWrapper) mAdapter).mSectionIndexerDelegate = null;
}
if (mAdapter != null) {
mAdapter.mDelegate = null;
}
mList.setAdapter(null);
clearHeader();
return;
}
if (mAdapter != null) {
mAdapter.unregisterDataSetObserver(mDataSetObserver);
}
if (adapter instanceof SectionIndexer) {
mAdapter = new SectionIndexerAdapterWrapper(getContext(), adapter);
} else {
mAdapter = new AdapterWrapper(getContext(), adapter);
}
mDataSetObserver = new AdapterWrapperDataSetObserver();
mAdapter.registerDataSetObserver(mDataSetObserver);
if (mOnHeaderClickListener != null) {
mAdapter.setOnHeaderClickListener(new AdapterWrapperHeaderClickHandler());
} else {
mAdapter.setOnHeaderClickListener(null);
}
mAdapter.setDivider(mDivider, mDividerHeight);
mList.setAdapter(mAdapter);
clearHeader();
}
@Override
public int getPositionForSection(final int section) {
if (mDecoratedBaseAdapter instanceof SectionIndexer) {
return ((SectionIndexer) mDecoratedBaseAdapter).getPositionForSection(section);
}
return 0;
}
@Override
public int getSectionForPosition(final int position) {
if (mDecoratedBaseAdapter instanceof SectionIndexer) {
return ((SectionIndexer) mDecoratedBaseAdapter).getSectionForPosition(position);
}
return 0;
}
@Override
public Object[] getSections() {
if (mDecoratedBaseAdapter instanceof SectionIndexer) {
return ((SectionIndexer) mDecoratedBaseAdapter).getSections();
}
return null;
}
public void setAdapter(RecyclerView.Adapter adapter) {
if (adapter instanceof SectionIndexer) {
adapter.registerAdapterDataObserver(this);
mIndexer = (SectionIndexer) adapter;
mSections = (String[]) mIndexer.getSections();
}
}
@Override
public int getSectionForPosition(int position) {
int section=0;
for (ListAdapter piece : getPieces()) {
int size=piece.getCount();
if (position < size) {
if (piece instanceof SectionIndexer) {
return(section + ((SectionIndexer)piece).getSectionForPosition(position));
}
return(0);
}
else {
if (piece instanceof SectionIndexer) {
Object[] sections=((SectionIndexer)piece).getSections();
if (sections != null) {
section+=sections.length;
}
}
}
position-=size;
}
return(0);
}
int findCurrentSectionPosition(int fromPosition) {
ListAdapter adapter = getAdapter();
// dataset has changed, no candidate
if (fromPosition >= adapter.getCount()) {
return -1;
}
if (adapter instanceof SectionIndexer) {
// try fast way by asking section indexer
SectionIndexer indexer = (SectionIndexer) adapter;
int sectionPosition = indexer.getSectionForPosition(fromPosition);
int itemPosition = indexer.getPositionForSection(sectionPosition);
int typeView = adapter.getItemViewType(itemPosition);
if (isItemViewTypePinned(adapter, typeView)) {
return itemPosition;
} // else, no luck
}
// try slow way by looking through to the next section item above
for (int position = fromPosition; position >= 0; position--) {
int viewType = adapter.getItemViewType(position);
if (isItemViewTypePinned(adapter, viewType)) {
return position;
}
}
// no candidate found
return -1;
}
int findCurrentSectionPosition(int fromPosition) {
ListAdapter adapter = getAdapter();
// dataset has changed, no candidate
if (fromPosition >= adapter.getCount()) {
return -1;
}
if (adapter instanceof SectionIndexer) {
// try fast way by asking section indexer
SectionIndexer indexer = (SectionIndexer) adapter;
int sectionPosition = indexer.getSectionForPosition(fromPosition);
int itemPosition = indexer.getPositionForSection(sectionPosition);
int typeView = adapter.getItemViewType(itemPosition);
if (isItemViewTypePinned(adapter, typeView)) {
return itemPosition;
} // else, no luck
}
// try slow way by looking through to the next section item above
for (int position = fromPosition; position >= 0; position--) {
int viewType = adapter.getItemViewType(position);
if (isItemViewTypePinned(adapter, viewType)) {
return position;
}
}
// no candidate found
return -1;
}
@Override
public int getPositionForSection(int section) {
if (mDecoratedBaseAdapter instanceof SectionIndexer) {
return ((SectionIndexer) mDecoratedBaseAdapter).getPositionForSection(section);
}
return 0;
}
@Override
public int getSectionForPosition(int position) {
if (mDecoratedBaseAdapter instanceof SectionIndexer) {
return ((SectionIndexer) mDecoratedBaseAdapter).getSectionForPosition(position);
}
return 0;
}
@Override
public Object[] getSections() {
if (mDecoratedBaseAdapter instanceof SectionIndexer) {
return ((SectionIndexer) mDecoratedBaseAdapter).getSections();
}
return null;
}