我无法为此找到好的教程。我有一个ListView，我想添加一个＆＃39; search＆＃39;根据操作栏中搜索小部件中的用户输入过滤列表视图的功能。
我已经浏览了几篇教程和几篇文章，但我无法理解这个概念。我最近的努力来自this site。
以下是我的自定义适配器代码（请注意，由于我尝试使其运行，可能会有不必要的代码：
package adapters;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.TextView;
import com.example.khalid.hisnulmuslim.R;
import java.util.ArrayList;
import java.util.List;
import classes.Dua;
public class DuaGroupAdapter extends ArrayAdapter<Dua> implements Filterable {
/* Filterable things */
private List<Dua> allModelItemsArray;
private List<Dua> filteredModelItemsArray;
private Activity context;
private ModelFilter filter;
private LayoutInflater inflator;
public DuaGroupAdapter(Activity context, List<Dua> list) {
super(context, R.layout.dua_list_item_card, list);
this.context = context;
this.allModelItemsArray = new ArrayList<Dua>();
allModelItemsArray.addAll(list);
this.filteredModelItemsArray = new ArrayList<Dua>();
filteredModelItemsArray.addAll(allModelItemsArray);
inflator = context.getLayoutInflater();
getFilter();
}
/* End of Filterable things */
public DuaGroupAdapter(Context context, int textViewResourceId) {
super(context, textViewResourceId);
}
public DuaGroupAdapter(Context context, int resource, List<Dua> items) {
super(context, resource, items);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
if (v == null) {
LayoutInflater vi;
vi = LayoutInflater.from(getContext());
v = vi.inflate(R.layout.dua_list_item_card, null);
}
Dua p = getItem(position);
if (p != null) {
TextView tvReference = (TextView) v.findViewById(R.id.txtReference);
TextView tvDuaName = (TextView) v.findViewById(R.id.txtDuaName);
if (tvReference != null) {
tvReference.setText("" + p.getReference());
}
if (tvDuaName != null) {
tvDuaName.setText(p.getTitle());
}
}
return v;
}
private class ModelFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
constraint = constraint.toString().toLowerCase();
FilterResults result = new FilterResults();
if (constraint != null && constraint.toString().length() > 0) {
ArrayList<Dua> filteredItems = new ArrayList<Dua>();
for (int i = 0, l = allModelItemsArray.size(); i < l; i++) {
Dua m = allModelItemsArray.get(i);
if (m.getGroup().toLowerCase().contains(constraint))
filteredItems.add(m);
}
result.count = filteredItems.size();
result.values = filteredItems;
} else {
synchronized (this) {
result.values = allModelItemsArray;
result.count = allModelItemsArray.size();
}
}
return result;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
filteredModelItemsArray = (ArrayList<Dua>) results.values;
notifyDataSetChanged();
clear();
for (int i = 0, l = filteredModelItemsArray.size(); i < l; i++)
add(filteredModelItemsArray.get(i));
notifyDataSetInvalidated();
}
}
}
这是我的布局XML：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ListView
android:id="@+id/duaListView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clipToPadding="false"
android:background="@android:color/white"/>
</RelativeLayout>
过滤器所需的文本将从操作栏的“搜索”小组件中获取。该活动能够检测何时将文本输入到搜索小部件文本字段中，但它什么都不显示; listView出现空白，一旦删除所有文本，它就会回到原始状态。
ListView的各行并不复杂，只有两个textViews，如下所示
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:padding="15dp"
android:background="?android:attr/selectableItemBackground">
<TextView
android:id="@+id/txtReference"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="sans-serif-condensed"
android:text="1"
android:textStyle="bold" />
<View
android:layout_width="15dp"
android:layout_height="fill_parent" />
<TextView
android:id="@+id/txtDuaName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="sans-serif-light"
android:text="Entering the Bathroom" />
</LinearLayout>
有人可以帮帮我吗？谢谢你的时间。
答案 0 :(得分：0)
ArrayAdapter。尝试这样做有各种各样的问题。要包含同步问题，无法保持列表和内部适配器列表同步等。有关详细信息，请参阅：Filtering Problems。当您需要自定义过滤解决方案时，有两种选择。
BaseAdapter。 答案 1 :(得分：0)
它可能对你有帮助，
片段中的
searchView.setOnQueryTextListener(new OnQueryTextListener()
{
@Override
public boolean onQueryTextSubmit(String query)
{
return false;
}
@Override
public boolean onQueryTextChange(String newText)
{
mSearchStr = newText;
if(mSearchStr.isEmpty())
{
mContList = new ArrayList<HashMap<String, String>>();
FetchContacts();
}
else if(mSearchStr.length()>=1)
{
mMyListAdapter.getFilter().filter(mSearchStr.toString());
}
return true;
}
});
在adapter.class中
package com.example.samplephonecontact;
import java.util.ArrayList;
import java.util.HashMap;
import com.example.samplephonecontact.ContactListFragment;
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.ImageView;
import android.widget.TextView;
public class ContactListAdapter extends BaseAdapter implements Filterable
{
private Context mContext;
private ValueFilter mValueFilter;
ArrayList<HashMap<String, String>> mContList;
ArrayList<HashMap<String, String>> mFilteredContList;
HashMap<String, String> mContObj ;
public ContactListAdapter(Context context, ArrayList<HashMap<String, String>> PackageList)
{
this.mContext = context;
this.mContList = PackageList;
this.mFilteredContList = PackageList;
}
public int getCount()
{
return mContList.size();
}
public Object getItem(int position)
{
return mContList.get(position);
}
public long getItemId(int position)
{
return position;
}
public View getView(int position, View convertView, ViewGroup viewGroup)
{
LayoutInflater mInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = mInflater.inflate(R.layout.cont_list, null);
TextView contactName = (TextView) convertView.findViewById(R.id.name);
TextView contactNumber = (TextView) convertView.findViewById(R.id.number);
ImageView contactImage = (ImageView) convertView.findViewById(R.id.contactimage);
mContObj = new HashMap<String, String>();
mContObj = mContList.get(position);
String name = mContObj.get("name");
String number = mContObj.get("number");
contactName.setText(name);
contactNumber.setText("\t"+number);
int resid = R.drawable.person1;
contactImage.setImageResource(resid);
return convertView;
}
@Override
public Filter getFilter()
{
if(mValueFilter==null)
{
mValueFilter=new ValueFilter();
}
return mValueFilter;
}
private class ValueFilter extends Filter
{
@SuppressLint("DefaultLocale")
@Override
protected FilterResults performFiltering(CharSequence constraint)
{
FilterResults results=new FilterResults();
ArrayList<HashMap<String, String>> filterList=new ArrayList<HashMap<String,String>>();
if(constraint!=null && constraint.length()>0)
{
for(int i=0;i<mFilteredContList.size();i++)
{
if((mFilteredContList.get(i).get("name").toString().toUpperCase()).contains(constraint.toString().toUpperCase()))
{
String name = mFilteredContList.get(i).get("name");
String num = mFilteredContList.get(i).get("number");
String id= mFilteredContList.get(i).get("id");
String numType = mFilteredContList.get(i).get("number_type");
String mail = mFilteredContList.get(i).get("mail");
String mailtype = mFilteredContList.get(i).get("mail_type");
String ch = constraint.toString().toUpperCase();
if(name.toUpperCase().contains(ch))
{
HashMap<String, String> list = new HashMap<String, String>();
list.put("id", id);
list.put("name", name);
list.put("number", num);
list.put("number_type", numType);
list.put("mail", mail);
list.put("mail_type", mailtype);
filterList.add(list);
}
}
}
results.count=filterList.size();
results.values=filterList;
ArrayItem ai = new ArrayItem();
ai.setMyArrayList(filterList);
}
else
{
results.count=mFilteredContList.size();
results.values=mFilteredContList;
}
return results;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint, FilterResults results)
{
mContList=(ArrayList<HashMap<String,String>>) results.values;
notifyDataSetChanged();
}
}
}
答案 2 :(得分：0)
一位朋友帮忙解决了这个问题。以下是设置过滤器的重要代码段：
public class DuaGroupAdapter extends BaseAdapter implements Filterable {
private Context mContext;
private LayoutInflater mInflater;
private List<Dua> mList;
@Override
public Filter getFilter() {
// return a filter that filters data based on a constraint
return new Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
final ExternalDbOpenHelper helper = ExternalDbOpenHelper.getInstance(mContext);
final SQLiteDatabase db = helper.openDataBase();
final List<Dua> duas = new ArrayList<>();
Cursor c = null;
try {
c = db.query(HisnDatabaseInfo.DuaGroupTable.TABLE_NAME, null,
HisnDatabaseInfo.DuaGroupTable.ENGLISH_TITLE + " like ?",
new String[] { "%" + constraint + "%" }, null, null, null);
if (c != null && c.moveToFirst()) {
do {
final Dua dua = new Dua(c.getInt(0), c.getString(2));
duas.add(dua);
} while (c.moveToNext());
}
} finally {
if (c != null) {
c.close();
}
}
final FilterResults results = new FilterResults();
results.values = duas;
results.count = duas.size();
return results;
}
@Override
protected void publishResults(CharSequence constraint, Filter.FilterResults results) {
if (results.count > 0) {
mList = (List<Dua>) results.values;
notifyDataSetChanged();
} else {
notifyDataSetInvalidated();
}
}
};
}
可以找到适配器的完整代码here。感谢所有的回复。