我正在创建一个自定义列表视图，其中包含一个自动完成文本视图，该列表正在从JSON填充。我想通过实现Filterable接口来过滤自定义列表。任何人都可以帮助我，如何实现{{1}自定义列表的方法
这是getFilter()方法
onCreate这是 @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.custom_list);
CustomListView = this;
setListData(); //to set the list data
Resources res = getResources();
list = (ListView) findViewById(R.id.list);
adapter = new CustomAdapter(CustomListView, CustomListViewValuesArr,
res);
list.setAdapter(adapter);
list.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
i1 = new Intent(CustomListHospital.this, Details.class);
i1.putExtra("Name", list.getItemAtPosition(position).toString());
startActivity(i1);
}
});
inputSearch.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence cs, int arg1, int arg2,
int arg3) {
// When user changed the Text
// getfilter to filter the search while user types in the search
// box
CustomListHospital.this.adapter.getFilter().filter(cs);
}
方法
setListData()这是我创建的自定义适配器的代码
public void setListData() {
i1 = getIntent();
s1 = i1.getStringExtra("Speciality");
try {
InputStream inputStream = getAssets().open("Hospital_Json.txt");
BufferedReader bufferedReader = new BufferedReader(
new InputStreamReader(inputStream));
String tempString;
StringBuilder builder = new StringBuilder();
while ((tempString = bufferedReader.readLine()) != null) {
builder.append(tempString);
builder.append(System.getProperty("line.separator"));
}
jsonString = builder.toString();
JSONObject jsonObject = new JSONObject(jsonString);
JSONArray jsonArray = jsonObject.getJSONArray("data");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject countryObject = jsonArray.getJSONObject(i);
String cellNo = countryObject.getString("Telephone");
String name = countryObject.getString("Name");
String special = countryObject.getString("Speciality");
String category = countryObject.getString("Category");
ListModel sched = new ListModel();
if (category.equals("Doctor") && special.equals(s1)) {
sched.setHospitalName(name);
sched.setCellNo(cellNo);
CustomListViewValuesArr.add(sched);
} else if (category.equals("Hospital") && special.equals(s1)) {
sched.setHospitalName(name);
sched.setCellNo(cellNo);
CustomListViewValuesArr.add(sched);
}
}
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
答案 0 :(得分：0)
以下是如何在Base Adapter
中使用过滤器的示例在您的活动中调用此过滤器
adapter.getFilter（）过滤器（ “textt”）;
public class AutocompleteFilterAdapter extends BaseAdapter implements
Filterable {
List<String> originalList, filterdList;
TestFilter filter = new TestFilter();
private Context mContext;
TextView txtName;
public AutocompleteFilterAdapter(List<String> data, Context context) {
this.originalList = data;
this.filterdList = data;
mContext = context;
}
@Override
public Filter getFilter() {
// TODO Auto-generated method stub
return filter;
}
private class TestFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
// TODO Auto-generated method stub
FilterResults results = new FilterResults();
List<String> list = new ArrayList<String>();
// String filterdString = null;
for (int i = 0; i < originalList.size(); i++) {
if (originalList.get(i).contains(
constraint.toString().substring(1)))
list.add(originalList.get(i));
}
results.values = list;
results.count = list.size();
return results;
}
@Override
protected void publishResults(CharSequence constraint,
FilterResults results) {
// TODO Auto-generated method stub
filterdList = (List<String>) results.values;
notifyDataSetChanged();
}
}
@Override
public int getCount() {
// TODO Auto-generated method stub
if (filterdList != null)
return filterdList.size();
return 0;
}
@Override
public String getItem(int position) {
// TODO Auto-generated method stub
return filterdList.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) mContext
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(
R.layout.autocompletetextview_search, parent, false);
}
txtName = (TextView) convertView
.findViewById(R.id.autoCompleteTextviewSearch);
txtName.setText(getItem(position));
return convertView;
}
}
答案 1 :(得分：0)
Here is another example:
public class PlanetAdapter extends ArrayAdapter<Planet> implements Filterable {
private List<Planet> planetList;
private Context context;
private Filter planetFilter;
private List<Planet> origPlanetList;
public PlanetAdapter(List<Planet> planetList, Context ctx) {
super(ctx, R.layout.img_row_layout, planetList);
this.planetList = planetList;
this.context = ctx;
this.origPlanetList = planetList;
}
public int getCount() {
return planetList.size();
}
public Planet getItem(int position) {
return planetList.get(position);
}
public long getItemId(int position) {
return planetList.get(position).hashCode();
}
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
PlanetHolder holder = new PlanetHolder();
// First let's verify the convertView is not null
if (convertView == null) {
// This a new view we inflate the new layout
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = inflater.inflate(R.layout.img_row_layout, null);
// Now we can fill the layout with the right values
TextView tv = (TextView) v.findViewById(R.id.name);
TextView distView = (TextView) v.findViewById(R.id.dist);
holder.planetNameView = tv;
holder.distView = distView;
v.setTag(holder);
}
else
holder = (PlanetHolder) v.getTag();
Planet p = planetList.get(position);
holder.planetNameView.setText(p.getName());
holder.distView.setText("" + p.getDistance());
return v;
}
public void resetData() {
planetList = origPlanetList;
}
/* *********************************
* We use the holder pattern
* It makes the view faster and avoid finding the component
* **********************************/
private static class PlanetHolder {
public TextView planetNameView;
public TextView distView;
}
/*
* We create our filter
*/
@Override
public Filter getFilter() {
if (planetFilter == null)
planetFilter = new PlanetFilter();
return planetFilter;
}
private class PlanetFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults();
// We implement here the filter logic
if (constraint == null || constraint.length() == 0) {
// No filter implemented we return all the list
results.values = origPlanetList;
results.count = origPlanetList.size();
}
else {
// We perform filtering operation
List<Planet> nPlanetList = new ArrayList<Planet>();
for (Planet p : planetList) {
if (p.getName().toUpperCase().startsWith(constraint.toString().toUpperCase()))
nPlanetList.add(p);
}
results.values = nPlanetList;
results.count = nPlanetList.size();
}
return results;
}
@Override
protected void publishResults(CharSequence constraint,
FilterResults results) {
// Now we have to inform the adapter about the new list filtered
if (results.count == 0)
notifyDataSetInvalidated();
else {
planetList = (List<Planet>) results.values;
notifyDataSetChanged();
}
}
}
}
and use it at MainActivity:
public class MainActivity extends Activity {
// The data to show
List<Planet> planetsList = new ArrayList<Planet>();
PlanetAdapter aAdpt;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initList();
// We get the ListView component from the layout
ListView lv = (ListView) findViewById(R.id.listView);
// This is a simple adapter that accepts as parameter
// Context
// Data list
// The row layout that is used during the row creation
// The keys used to retrieve the data
// The View id used to show the data. The key number and the view id must match
//aAdpt = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, android.R.id.text1, planetsList);
aAdpt = new PlanetAdapter(planetsList, this);
lv.setAdapter(aAdpt);
// React to user clicks on item
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parentAdapter, View view, int position,
long id) {
// We know the View is a <extView so we can cast it
TextView clickedView = (TextView) view;
Toast.makeText(MainActivity.this, "Item with id ["+id+"] - Position ["+position+"] - Planet ["+clickedView.getText()+"]", Toast.LENGTH_SHORT).show();
}
});
// we register for the contextmneu
registerForContextMenu(lv);
// TextFilter
lv.setTextFilterEnabled(true);
EditText editTxt = (EditText) findViewById(R.id.editTxt);
editTxt.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
System.out.println("Text ["+s+"] - Start ["+start+"] - Before ["+before+"] - Count ["+count+"]");
if (count < before) {
// We're deleting char so we need to reset the adapter data
aAdpt.resetData();
}
aAdpt.getFilter().filter(s.toString());
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
@Override
public void afterTextChanged(Editable s) {
}
});
}
// We want to create a context Menu when the user long click on an item
@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
AdapterContextMenuInfo aInfo = (AdapterContextMenuInfo) menuInfo;
// We know that each row in the adapter is a Map
Planet planet = aAdpt.getItem(aInfo.position);
menu.setHeaderTitle("Options for " + planet.getName());
menu.add(1, 1, 1, "Details");
menu.add(1, 2, 2, "Delete");
}
// This method is called when user selects an Item in the Context menu
@Override
public boolean onContextItemSelected(MenuItem item) {
int itemId = item.getItemId();
AdapterContextMenuInfo aInfo = (AdapterContextMenuInfo) item.getMenuInfo();
planetsList.remove(aInfo.position);
aAdpt.notifyDataSetChanged();
return true;
}
private void initList() {
// We populate the planets
planetsList.add(new Planet("Mercury", 10));
planetsList.add(new Planet("Venus", 20));
planetsList.add(new Planet("Mars", 30));
planetsList.add(new Planet("Jupiter", 40));
planetsList.add(new Planet("Saturn", 50));
planetsList.add(new Planet("Uranus", 60));
planetsList.add(new Planet("Neptune", 70));
}
// Handle user click
public void addPlanet(View view) {
final Dialog d = new Dialog(this);
d.setContentView(R.layout.dialog);
d.setTitle("Add planet");
d.setCancelable(true);
final EditText edit = (EditText) d.findViewById(R.id.editTextPlanet);
Button b = (Button) d.findViewById(R.id.button1);
b.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
String planetName = edit.getText().toString();
MainActivity.this.planetsList.add(new Planet(planetName, 0));
MainActivity.this.aAdpt.notifyDataSetChanged(); // We notify the data model is changed
d.dismiss();
}
});
d.show();
}
}