我有一些来自数据库的数据，我在列表视图中显示之前，我正在使用索引器按字母顺序排列项目。所以我的列表显示按字母顺序排列的项目部分标题。现在我想从列表中搜索项目使用在editText中输入的单词。如何做到这一点我知道我们可以使用filter和textwatcher但是如何使用它，因为我设置为listview的适配器不是arrayadapter而是SimpleSectionAdapter。
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扩展BaseAdapter实现Filterable {private 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;
}
};
}
}
答案 0 :(得分：1)
Textwatcher代码
inputSearch.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence cs,
int arg1, int arg2, int arg3) {
// When user changed the Text
mainmenu2.this.adapter1.getFilter().filter(
cs);
}
@Override
public void beforeTextChanged(CharSequence arg0,
int arg1, int arg2, int arg3) {
// TODO Auto-generated method stub
}
@Override
public void afterTextChanged(Editable arg0) {
// TODO Auto-generated method stub
}
});
和里面
public class SimpleSectionAdapter<T> extends BaseAdapter {
像这样实现Filterable
public class SimpleSectionAdapter<T> extends BaseAdapter implements Filterable
然后在SimpleSectionAdapter中使用这个android.widget.Filter getFilter（）（“根据你的编辑它，它只是一个例子）
public android.widget.Filter getFilter() {
// TODO Auto-generated method stub
return new android.widget.Filter() {
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
// TODO Auto-generated method stub
mDisplayedValues = (ArrayList<Product>) results.values; // has the filtered values
notifyDataSetChanged(); // notifies the data with new filtered values
}
@Override
protected FilterResults performFiltering(CharSequence constraint) {
// TODO Auto-generated method stub
FilterResults results = new FilterResults(); // Holds the results of a filtering operation in values
ArrayList<Product> FilteredArrList = new ArrayList<Product>();
if (mOriginalValues == null) {
mOriginalValues = new ArrayList<Product>(mDisplayedValues); // saves the original data in mOriginalValues
}
/********
*
* If constraint(CharSequence that is received) is null returns the mOriginalValues(Original) values
* else does the Filtering and returns FilteredArrList(Filtered)
*
********/
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).fname);
if (data.toLowerCase().startsWith(constraint.toString())) {
FilteredArrList.add(new Product(mOriginalValues.get(i).id,mOriginalValues.get(i).fname,mOriginalValues.get(i).lname));
}
}
// set the Filtered result to return
results.count = FilteredArrList.size();
results.values = FilteredArrList;
}
return results;
}
};
}
答案 1 :(得分：0)
使用Textwatcher。 Click here more details
public class MainActivity extends Activity {
ArrayList<String> list = new ArrayList<String>();
private EditText searchEdt;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// making it full screen
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_ugsimply_beta);
list.add("Samsung Tab");
list.add("Samsung Note");
list.add("Nokia Lumia");
list.add("Nokia 5130");
list.add("Sony Xperia");
searchEdt = (EditText) findViewById(R.id.searchEdt);
searchEdt.addTextChangedListener(new TextWatcher() {
private int textlength;
private ArrayList<String> arrayList_sort = new ArrayList<String>();
public void afterTextChanged(Editable s) {
// Abstract Method of TextWatcher Interface.
}
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// Abstract Method of TextWatcher Interface.
}
public void onTextChanged(CharSequence s, int start, int before,
int count) {
textlength = searchEdt.getText().length();
if (arrayList_sort != null)
arrayList_sort.clear();
for (int i = 0; i < list.size(); i++) {
if (textlength <= list.get(i).toString().length()) {
if (searchEdt
.getText()
.toString()
.equalsIgnoreCase(
(String) list.get(i).toString()
.subSequence(0, textlength))) {
arrayList_sort.add(list.get(i));
Log.d("TAG", "log" + arrayList_sort.size());
}
}
}
}
});
}
}
答案 2 :(得分：0)
在onTextChanged上写这样......
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
if (s.toString().length() >= THRESHOLD ){
FetchResult fetchResult = new FetchResult();
fetchResult.execute(s.toString());
}
}