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我有一些数据来自数据库，在列表视图中显示之前，我使用索引器按字母顺序排列项目。因此，我的列表显示的项目按字母顺序排列，并带有节标题。现在，我想要使用editText中输入的单词从列表中搜索项目。如何做到这一点，我知道我们可以使用filter和textwatcher来使用它，因为我设置为listview的适配器不是arrayadapter，而是SimpleSectionAdapter。将搜索过滤器应用于自定义列表
dbHelper.openDataBase();
Cursor cursor = dbHelper.fetchAllRecords();
Log.v("count of records", cursor.getCount() + "");
ArrayList<CategoryPojo> contents = new ArrayList<CategoryPojo>();
cursor.moveToFirst();
CategoryPojo cp;
while (cursor.isAfterLast() == false) {
cp = new CategoryPojo();
cp.setCategoryName(cursor.getString(cursor
.getColumnIndex(DataBaseHelper.KEY_CATEGORIES)));
cp.setCategoryImageName(cursor.getString(cursor
.getColumnIndex(DataBaseHelper.KEY_IMAGENAME)));
cursor.moveToNext();
contents.add(cp);
}
cursor.close();
dbHelper.close();
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);
edtSearch.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
@Override
public void afterTextChanged(Editable s) {
}
});
And Simplesectionadapter is
公共类SimpleSectionAdapter延伸BaseAdapter实现的可筛选{私人的ArrayList mOriginalValues，mDisplayedValues;
static final boolean DEBUG = false;
static final String TAG = SimpleSectionAdapter.class.getSimpleName();
// Constants
private static final int VIEW_TYPE_SECTION_HEADER = 0;
private Context mContext;
private BaseAdapter mListAdapter;
private int mSectionHeaderLayoutId;
private int mSectionTitleTextViewId;
private Sectionizer<T> mSectionizer;
private LinkedHashMap<String, Integer> mSections;
AlphabetIndexer alphaIndexer;
public SimpleSectionAdapter(Context context, ArrayList<CategoryPojo> contents, 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.mOriginalValues = contents;
this.mDisplayedValues = contents;
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 mDisplayedValues.size();
//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++) {
@SuppressWarnings("unchecked")
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;
}
@Override
public Filter getFilter() {
return new android.widget.Filter() {
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint,
FilterResults results) {
mDisplayedValues = (ArrayList<CategoryPojo>) results.values;
// has
// the
// filtered
// values
notifyDataSetChanged(); // notifies the data with new filtered
// values
}
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults(); // Holds the
// results of a
// filtering
// operation in
// values
ArrayList<CategoryPojo> FilteredArrList = new ArrayList<CategoryPojo>();
if (mOriginalValues == null) {
mOriginalValues = new ArrayList<CategoryPojo>(mDisplayedValues);
}
if (constraint == null || constraint.length() == 0) {
// set the Original result to return
results.count = mOriginalValues.size();
results.values = mOriginalValues;
} else {
constraint = constraint.toString().toLowerCase();
for (int i = 0; i < mOriginalValues.size(); i++) {
String data = String.valueOf(mOriginalValues.get(i)
.getCategoryName());
if (data.toLowerCase()
.startsWith(constraint.toString())) {
FilteredArrList.add(new CategoryPojo(
mOriginalValues.get(i).getCategoryName(),
mOriginalValues.get(i)
.getCategoryImageName()));
}
}
// set the Filtered result to return
results.count = FilteredArrList.size();
results.values = FilteredArrList;
}
return results;
}
};
}
}
实现您的代码，但它不搜索列表中的项目什么是mOriginalvalues和mDisplayedVaues，我们必须定义它。 – user1758835 2013-02-13 08:49:27
mOriginalValues在ArrayList和mDisplayedVaues原始值是要显示的值 – saran 2013-02-13 09:02:28
我得到空指针异常的mOriginalValues – user1758835 2013-02-13 09:13:57