列出筛选器自定义适配器不给出结果
列出筛选器自定义适配器不给出结果
提问于 2011-12-30 17:46:58
我正在开发有列表和上面编辑文本的应用程序，当我在editText中键入一些东西的时候，我应该得到与键入的word.bt匹配的结果，我不能得到结果，请告诉我哪里犯了错？下面是我的Activity和Adapter。
**Activity**
public class ListFilterActivity extends ListActivity{
ListView list;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.list_filter);
list = getListView();
list.isTextFilterEnabled();
// final ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
// android.R.layout.simple_list_item_1, android.R.id.text1,
// getModel());
final CustomAdapter adapter = new CustomAdapter(ListFilterActivity.this, getModel());
setListAdapter(adapter);
EditText filterEditText = (EditText) findViewById(R.id.filterText);
filterEditText.addTextChangedListener(new TextWatcher() {
public void onTextChanged(CharSequence s, int start, int before,
int count) {
adapter.getFilter().filter(s.toString());
}
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
public void afterTextChanged(Editable s) {
}
});
}
private ArrayList<String> getModel() {
ArrayList<String> list = new ArrayList<String>();
list.add("Linux");
list.add("Windows7");
list.add("Suse");
list.add("Eclipse");
list.add("Ubuntu");
list.add("Solaris");
list.add("Android");
list.add("Ayes");
list.add("iPhone");
return list;
}
}Adapter***
public class CustomAdapter extends ArrayAdapter<String> {
private final Context context;
private final ArrayList<String> names;
private LayoutInflater mInflater;
private TextView txt;
public CustomAdapter(Context context, ArrayList<String> names) {
super(context, R.layout.row, names);
this.context = context;
this.names = names;
mInflater = LayoutInflater.from(context);
}
public Filter getFilter() {
if(newFilter == null) {
newFilter = new Filter() {
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
// TODO Auto-generated method stub
Log.d("TAG", "publishResults");
notifyDataSetChanged();
}
@Override
protected FilterResults performFiltering(CharSequence prefix) {
FilterResults results = new FilterResults();
ArrayList<String> i = new ArrayList<String>();
if (prefix!= null && prefix.toString().length() > 0) {
for (int index = 0; index < names.size(); index++) {
String si = names.get(index);
if(si.compareTo(prefix.toString()) == 0){
i.add(si);
}
}
results.values = i;
results.count = i.size();
}
else{
synchronized (names){
results.values = names;
results.count = names.size();
}
}
return results;
}
};
}
// Log.d("TAG", "end getFilter");
return newFilter;
}
@Override
public String getItem(int position) {
return super.getItem(position);
}
@Override
public int getCount() {
return super.getCount();
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View rowView = convertView;
if(rowView == null) {
rowView = mInflater.inflate(R.layout.row, null);
txt = (TextView)rowView.findViewById(R.id.text1);
}
else {
rowView.getTag();
}
txt.setText(names.get(position));
return rowView;
}
}请帮帮我..。
回答 4
Stack Overflow用户
回答已采纳
发布于 2011-12-30 17:51:55
您需要对适配器类实现Filterable并覆盖getFilter()
Checkout this complete example for Filtering Adapter。
更新：
public class ListFilterActivity extends ListActivity {
private List<String> list = new ArrayList<String>();
List<String> mOriginalValues;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final MyAdapter adapter = new MyAdapter(this, getModel());
setListAdapter(adapter);
EditText filterEditText = (EditText) findViewById(R.id.filterText);
// Add Text Change Listener to EditText
filterEditText.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
// Call back the Adapter with current character to Filter
adapter.getFilter().filter(s.toString());
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,int after) {
}
@Override
public void afterTextChanged(Editable s) {
}
});
}
private List<String> getModel() {
list.add("Linux");
list.add("Windows7");
list.add("Suse");
list.add("Eclipse");
list.add("Ubuntu");
list.add("Solaris");
list.add("Android");
list.add("iPhone");
list.add("Windows XP");
return list;
}
// Adapter Class
public class MyAdapter extends BaseAdapter implements Filterable {
List<String> arrayList;
List<String> mOriginalValues; // Original Values
LayoutInflater inflater;
public MyAdapter(Context context, List<String> arrayList) {
this.arrayList = arrayList;
inflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
return arrayList.size();
}
@Override
public Object getItem(int position) {
return arrayList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
private class ViewHolder {
TextView textView;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null) {
holder = new ViewHolder();
convertView = inflater.inflate(R.layout.row, null);
holder.textView = (TextView) convertView
.findViewById(R.id.textview);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.textView.setText(arrayList.get(position));
return convertView;
}
@Override
public Filter getFilter() {
Filter filter = new Filter() {
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint,FilterResults results) {
arrayList = (List<String>) 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
List<String> FilteredArrList = new ArrayList<String>();
if (mOriginalValues == null) {
mOriginalValues = new ArrayList<String>(arrayList); // 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 = mOriginalValues.get(i);
if (data.toLowerCase().contains(constraint.toString())) {
FilteredArrList.add(data);
}
}
// set the Filtered result to return
results.count = FilteredArrList.size();
results.values = FilteredArrList;
}
return results;
}
};
return filter;
}
}
}Stack Overflow用户
发布于 2011-12-30 17:48:58
您需要在自定义适配器中覆盖getFilter()。
Stack Overflow用户
发布于 2012-10-29 05:26:17
虽然Lalit的解决方案运行良好，但您可以在ActionBar中实现SearchView，这将使您的UI更加美观。你可以在你的活动中获得SearchView，如下所述-
@Override
public boolean onCreateOptionsMenu(Menu menu) {
//Create the search view
SearchView searchView = new SearchView(getSupportActionBar().getThemedContext());
mListView = getListView();
mListView.setTextFilterEnabled(true);
setupSearchView(searchView);
menu.add(0, 1, 1, "Search Text")
.setIcon(R.drawable.ic_search)
.setActionView(searchView)
.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM | MenuItem.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW);
return super.onCreateOptionsMenu(menu);
}
private void setupSearchView(SearchView mSearchView) {
mSearchView.setIconifiedByDefault(false);
mSearchView.setSubmitButtonEnabled(false);
mSearchView.setOnQueryTextListener(this);
mSearchView.setQueryHint("Search Text");
}
@Override
public boolean onQueryTextChange(String newText) {
if (TextUtils.isEmpty(newText)) {
mListView.clearTextFilter();
} else {
mListView.setFilterText(newText);
}
return true;
}
@Override
public boolean onQueryTextSubmit(String query) {
return false;
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/8678163
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