问题
I have a listview of items coming from a database. Now I have put an edit text at the top of my listview. What I want is that when a user start typing in the edit text, the listview should be filtered. For example, if the user enters a letter "A", only the names starting with an "A" should appear in the list. I have used a custom adapter in my code. I asked this question many times, but haven't found a solution yet.
This is my data list activity code:
public class DataListActivity extends Activity {
ListView listView;
SQLiteDatabase sqLiteDatabase;
FoodDbHelper foodDbHelper;
Cursor cursor;
ListDataAdapter listDataAdapter;
private Button button1;
ListDataAdapter dataAdapter = null;
Button button;
DataProvider dataProvider;
ArrayList<HashMap<String, String>> namessList;
EditText inputSearch;
String search_name;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.data_list_layout);
inputSearch = (EditText)findViewById(R.id.inputSearch);
inputSearch.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
// When user changes the Text
listDataAdapter.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
}
});
listView = (ListView) findViewById(R.id.list_View);
listDataAdapter = new ListDataAdapter(getApplicationContext(),
R.layout.row_layout) {
@Override
protected void showCheckedButton(int position, boolean value) {
// TODO Auto-generated method stub
DataProvider item = (DataProvider) listDataAdapter
.getItem(position);
Log.i("", "");
item.setSelected(value);
Button myButton = (Button) findViewById(R.id.findSelected);
myButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
StringBuffer responseText = new StringBuffer();
responseText
.append("The following dishes were selected...\n");
ArrayList<DataProvider> list = listDataAdapter
.getSelectedIndexes();
int sum = 0;
for (int i = 0; i < list.size(); i++) {
DataProvider dataProvider = list.get(i);
sum = sum + dataProvider.getCalorie();
responseText.append("\n" + dataProvider.getName()
+ " : " + dataProvider.getCalorie()
+ " kcal"
);
}
Toast.makeText(getApplicationContext(), ""+responseText+"\n"+"................................."
+"\n"+"Total Calories In Your Menu Is : " +sum,
Toast.LENGTH_LONG).show();
}
});
}
};
listView.setAdapter(listDataAdapter);
foodDbHelper = new FoodDbHelper(getApplicationContext());
sqLiteDatabase = foodDbHelper.getReadableDatabase();
cursor = foodDbHelper.getInformations(sqLiteDatabase);
if (cursor.moveToFirst()) {
do {
String name, quantity, fat, protein, sugar, vitamins;
boolean selected = false;
String names = null;
Integer calorie;
name = cursor.getString(0);
quantity = cursor.getString(1);
calorie = Integer.valueOf(cursor.getString(2));
fat = cursor.getString(3);
protein = cursor.getString(4);
sugar = cursor.getString(5);
vitamins = cursor.getString(6);
DataProvider dataProvider = new DataProvider(name, quantity,
calorie, fat, protein, sugar, vitamins, names, selected);
listDataAdapter.add(dataProvider);
} while (cursor.moveToNext());
}
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
String name = (String) ((TextView) view
.findViewById(R.id.text_dish_name)).getText();
String quantity = (String) ((TextView) view
.findViewById(R.id.text_dish_quantity)).getText();
String calorie = (String) ((TextView) view
.findViewById(R.id.text_dish_calorie)).getText();
String fat = (String) ((TextView) view
.findViewById(R.id.text_dish_fat)).getText();
String protein = (String) ((TextView) view
.findViewById(R.id.text_dish_protein)).getText();
String sugar = (String) ((TextView) view
.findViewById(R.id.text_dish_sugar)).getText();
String vitamins = (String) ((TextView) view
.findViewById(R.id.text_dish_vitamins)).getText();
String.valueOf(parent.getItemAtPosition(position));
Toast.makeText(getApplicationContext(),
"dish name is : " + name, Toast.LENGTH_SHORT).show();
Intent intent = new Intent(getApplicationContext(),
Detail.class);
intent.putExtra("Dish name", name);
intent.putExtra("Dish quantity", quantity);
intent.putExtra("Dish calorie", calorie);
intent.putExtra("Dish fat", fat);
intent.putExtra("Dish protein", protein);
intent.putExtra("Dish sugar", sugar);
intent.putExtra("Dish vitamins", vitamins);
startActivity(intent);
}
});
}
public void gobackk(View view) {
Intent intent = new Intent(this, MainMenu.class);
startActivity(intent);
}
回答1:
Use the addTextChangedListener() method of your EditText. It would look something like this
inputSearch = (EditText)findViewById(R.id.editText);
....
....
listView.setAdapter(listDataAdapter);
inputSearch.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
// When user changes the Text
listDataAdapter.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
}
});
回答2:
Instead of EditText can you use SearchView in your Xml?? If that's not problem then here you have complete working code with adapter and xml everything.!
XML
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MyActivity" >
<SearchView
android:id="@+id/searchPlayers"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:background="@color/Blue600"
android:layout_alignParentTop="true" />
<ListView
android:id="@+id/playersList"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/searchPlayers"
android:divider="@color/Teal"
android:dividerHeight="1dp"
android:scrollingCache="false"
android:smoothScrollbar="true" />
Let your mainActivity extends Activity implements SearchView.OnQueryTextListener, Filterable,SearchView.OnCloseListener
Inside onCreate() of MainActivity:
searchView = (SearchView) findViewById(R.id.searchPlayers);
searchView.setOnQueryTextListener(this);
searchView.setOnCloseListener(this);
searchView.setQueryHint("Search by Player");
Override these in you MainActivity:
@Override
public boolean onQueryTextChange(String newText) {list will get filtered as per input.
if (TextUtils.isEmpty(newText)) {
listView.clearTextFilter();
customAdapter.getFilter().filter("");
} else {
if(customAdapter!=null){
PlayersCustomAdapter ca = (PlayersCustomAdapter) listView.getAdapter();
ca.getFilter().filter(newText);
}
}
return true;
}
@Override
public boolean onQueryTextSubmit(String abc) {
return false;
}
@Override
public android.widget.Filter getFilter() {
return null;
}
@Override
public boolean onClose() {//it will set the list to initial position when searchView is closed
customAdapter.getFilter().filter("");
return false;
}
Here is the Custom Adapter..!
public class PlayersCustomAdapter extends BaseAdapter implements Filterable {
Context context;
ArrayList<PlayersMapper> playersMapperList, filteredplayersMapperList;
public PlayersCustomAdapter(Context context, ArrayList<PlayersMapper> list) {
super();
//PlayersMapper is the model~mapper class, where i have all views which i am getting from my web service.
this.context = context;
this.playersMapperList = list;
}
public PlayersCustomAdapter(){
}
class ViewHolder {
protected TextView tvPlayerName;
protected TextView tvTeamName;
protected TextView tvNationality;
protected ImageView ivPlayerPic;
}
@Override
public Filter getFilter() {
return new Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
final FilterResults filteringResult = new FilterResults();
final ArrayList<PlayersMapper> filterdResult = new ArrayList<PlayersMapper>();
if (filteredplayersMapperList == null)
filteredplayersMapperList = new ArrayList<PlayersMapper>(playersMapperList);
if (constraint != null) {
if (filteredplayersMapperList != null
&& filteredplayersMapperList.size() > 0) {
for (final PlayersMapper pmObj : filteredplayersMapperList) {
if (pmObj.PlayerName.contains(constraint.toString()))
filterdResult.add(pmObj);
}
}
filteringResult.values = filterdResult;
filteringResult.count = filterdResult.size();
}
return filteringResult;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint,
FilterResults results) {
if (results.count == 0) {
notifyDataSetInvalidated();
} else {
playersMapperList = (ArrayList<PlayersMapper>) results.values;
notifyDataSetChanged();
}
}
};
}
public void notifyDataSetChanged() {
super.notifyDataSetChanged();
}
@Override
public int getCount() {
return playersMapperList.size();
}
@Override
public Object getItem(int position) {
return playersMapperList.get(position);
}
@Override
public long getItemId(int pos) {
return pos;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
View view = null;
LayoutInflater inflator = ((Activity) context).getLayoutInflater();
view = inflator.inflate(R.layout.players_item, null);
final ViewHolder viewHolder = new ViewHolder();
viewHolder.tvPlayerName = (TextView) view
.findViewById(R.id.txtViewPlayerName);
viewHolder.tvTeamName = (TextView) view
.findViewById(R.id.txtViewTeamName);
viewHolder.tvNationality = (TextView) view
.findViewById(R.id.txtViewCountryName);
viewHolder.ivPlayerPic = (ImageView) view
.findViewById(R.id.imgViewPlayers);
view.setTag(viewHolder);
ViewHolder holder = (ViewHolder) view.getTag();
holder.tvPlayerName.setText(playersMapperList.get(position).PlayerName);
holder.tvTeamName.setText(playersMapperList.get(position).TeamName);
holder.tvNationality
.setText(playersMapperList.get(position).Nationality);
return view;
}
}
来源：https://stackoverflow.com/questions/30818595/android-listview-with-filter-issue