我正在为我的列表视图使用自定义适配器，并且我想应用过滤器从列表中搜索特定项目怎么做？我知道如何为扩展 ArrayAdapter 的适配器执行此操作，但在我的情况下，它是 simplesectionadapter。我在列表视图上方有一个 editText，来自我想要搜索项目的 edittext 中输入的文本。
Collections.sort(contents, new Comparator<CategoryPojo>() {
@Override
public int compare(CategoryPojo s1, CategoryPojo s2) {
return s1.getCategoryName().compareToIgnoreCase(
s2.getCategoryName());
}
});
final CategoryAdapter adapter = new CategoryAdapter(this,
android.R.layout.simple_list_item_1, contents);
Sectionizer<CategoryPojo> alphabetSectionizer = new Sectionizer<CategoryPojo>() {
@Override
public String getSectionTitleForItem(CategoryPojo instance) {
return instance.getCategoryName().substring(0, 1);
}
};
final SimpleSectionAdapter<CategoryPojo> sectionAdapter = new SimpleSectionAdapter<CategoryPojo>(
this, adapter, R.layout.section_header, R.id.title,
alphabetSectionizer);
listView.setFastScrollEnabled(true);
listView.setTextFilterEnabled(true);
listView.setAdapter(sectionAdapter);
这是简单的sectionadapter
public class SimpleSectionAdapter<T> extends BaseAdapter implements Filterable{
static final boolean DEBUG = false;
static final String TAG = SimpleSectionAdapter.class.getSimpleName();
// Constants
private static final int VIEW_TYPE_SECTION_HEADER = 0;
// Attributes
private Context mContext;
private BaseAdapter mListAdapter;
private int mSectionHeaderLayoutId;
private int mSectionTitleTextViewId;
private Sectionizer<T> mSectionizer;
private LinkedHashMap<String, Integer> mSections;
AlphabetIndexer alphaIndexer;
private Filter filter;
/**
* Constructs a {@linkplain SimpleSectionAdapter}.
*
* @param context The context for this adapter.
* @param listAdapter A {@link ListAdapter} that has to be sectioned.
* @param sectionHeaderLayoutId Layout Id of the layout that is to be used for the header.
* @param sectionTitleTextViewId Id of a TextView present in the section header layout.
* @param sectionizer Sectionizer for sectioning the {@link ListView}.
*/
public SimpleSectionAdapter(Context context, BaseAdapter listAdapter,
int sectionHeaderLayoutId, int sectionTitleTextViewId,
Sectionizer<T> sectionizer) {
if(context == null) {
throw new IllegalArgumentException("context cannot be null.");
} else if(listAdapter == null) {
throw new IllegalArgumentException("listAdapter cannot be null.");
} else if(sectionizer == null) {
throw new IllegalArgumentException("sectionizer cannot be null.");
} else if(!isTextView(context, sectionHeaderLayoutId, sectionTitleTextViewId)) {
throw new IllegalArgumentException("sectionTitleTextViewId should be a TextView.");
}
this.mContext = context;
this.mListAdapter = listAdapter;
this.mSectionHeaderLayoutId = sectionHeaderLayoutId;
this.mSectionTitleTextViewId = sectionTitleTextViewId;
this.mSectionizer = sectionizer;
this.mSections = new LinkedHashMap<String, Integer>();
// Find sections
findSections();
}
private boolean isTextView(Context context, int layoutId, int textViewId) {
View inflatedView = View.inflate(context, layoutId, null);
View foundView = inflatedView.findViewById(textViewId);
return foundView instanceof TextView;
}
@Override
public int getCount() {
return mListAdapter.getCount() + getSectionCount();
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = convertView;
SectionHolder sectionHolder = null;
switch (getItemViewType(position)) {
case VIEW_TYPE_SECTION_HEADER:
if(view == null) {
view = View.inflate(mContext, mSectionHeaderLayoutId, null);
sectionHolder = new SectionHolder();
sectionHolder.titleTextView = (TextView) view.findViewById(mSectionTitleTextViewId);
view.setTag(sectionHolder);
} else {
sectionHolder = (SectionHolder) view.getTag();
}
break;
default:
view = mListAdapter.getView(getIndexForPosition(position),
convertView, parent);
break;
}
if(sectionHolder != null) {
String sectionName = sectionTitleForPosition(position);
sectionHolder.titleTextView.setText(sectionName);
}
return view;
}
@Override
public boolean areAllItemsEnabled() {
return mListAdapter.areAllItemsEnabled() ?
mSections.size() == 0 : false;
}
@Override
public int getItemViewType(int position) {
int positionInCustomAdapter = getIndexForPosition(position);
return mSections.values().contains(position) ?
VIEW_TYPE_SECTION_HEADER :
mListAdapter.getItemViewType(positionInCustomAdapter) + 1;
}
@Override
public int getViewTypeCount() {
return mListAdapter.getViewTypeCount() + 1;
}
@Override
public boolean isEnabled(int position) {
return mSections.values().contains(position) ?
false : mListAdapter.isEnabled(getIndexForPosition(position));
}
@Override
public Object getItem(int position) {
return mListAdapter.getItem(getIndexForPosition(position));
}
@Override
public long getItemId(int position) {
return mListAdapter.getItemId(getIndexForPosition(position));
}
@Override
public void notifyDataSetChanged() {
mListAdapter.notifyDataSetChanged();
findSections();
super.notifyDataSetChanged();
}
/**
* Returns the actual index of the object in the data source linked to the this list item.
*
* @param position List item position in the {@link ListView}.
* @return Index of the item in the wrapped list adapter's data source.
*/
public int getIndexForPosition(int position) {
int nSections = 0;
Set<Entry<String, Integer>> entrySet = mSections.entrySet();
for(Entry<String, Integer> entry : entrySet) {
if(entry.getValue() < position) {
nSections++;
}
}
return position - nSections;
}
static class SectionHolder {
public TextView titleTextView;
}
private void findSections() {
int n = mListAdapter.getCount();
int nSections = 0;
mSections.clear();
for(int i=0; i<n; i++) {
String sectionName = mSectionizer.getSectionTitleForItem((T) mListAdapter.getItem(i));
if(!mSections.containsKey(sectionName)) {
mSections.put(sectionName, i + nSections);
nSections ++;
}
}
if(DEBUG) {
Log.d(TAG, String.format("Found %d sections.", mSections.size()));
}
}
private int getSectionCount() {
return mSections.size();
}
private String sectionTitleForPosition(int position) {
String title = null;
Set<Entry<String, Integer>> entrySet = mSections.entrySet();
for(Entry<String, Integer> entry : entrySet) {
if(entry.getValue() == position) {
title = entry.getKey();
break;
}
}
return title;
}