Android的ListView的带过滤器的问题 [英] Android listview with filter issue
本文介绍了Android的ListView的带过滤器的问题的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我已经从数据库来的项目列表视图。现在，我已经把一个文本编辑在我的列表视图的顶部。我要的是，当用户开始在编辑文本输入，列表视图应过滤。例如，如果用户输入一个字母A，只有开头的A应该出现在列表中的名称。我在code使用的自定义适配器。我问这个问题很多次，但都没有找到一个解决办法。
这是我的数据列表活动code：
公共类DataListActivity延伸活动{ ListView控件的ListView;
SQLiteDatabase sqLiteDatabase;
FoodDbHelper foodDbHelper;
光标光标;
ListDataAdapter listDataAdapter;
私人按钮BUTTON1;
ListDataAdapter DataAdapter的= NULL;
Button按钮;
DataProvider的dataProvider中;
ArrayList的＆LT;＆HashMap的LT;字符串，字符串＆GT;＆GT; namessList;
的EditText inputSearch;
串SEARCH_NAME;
@覆盖
保护无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
requestWindowFeature（Window.FEATURE_NO_TITLE）;
的setContentView（R.layout.data_list_layout）;
inputSearch =（EditText上）findViewById（R.id.inputSearch）;
inputSearch.addTextChangedListener（新TextWatcher（）{ @覆盖
公共无效onTextChanged（CharSequence的CS，INT ARG1，ARG2 INT，INT ARG3）{
//当用户更改文本
。listDataAdapter.getFilter（）过滤器（CS）;
} @覆盖
公共无效beforeTextChanged（CharSequence的为arg0，ARG1 INT，INT ARG2，
INT ARG3）{
// TODO自动生成方法存根 } @覆盖
公共无效afterTextChanged（编辑为arg0）{
// TODO自动生成方法存根
}
}）; ListView控件=（ListView控件）findViewById（R.id.list_View）; listDataAdapter =新ListDataAdapter（getApplicationContext（）
R.layout.row_layout）{ @覆盖
保护无效showCheckedButton（INT位置，布尔值）{
// TODO自动生成方法存根 dataProvider项目=（DataProvider的）listDataAdapter
.getItem（位置）;
Log.i（，）; item.setSelected（值）; 按钮则myButton =（按钮）findViewById（R.id.findSelected）;
myButton.setOnClickListener（新View.OnClickListener（）{ @覆盖
公共无效的onClick（视图v）{ StringBuffer的responseText的=新的StringBuffer（）;
responseText的
.append（选择了下列菜... \\ n）; ArrayList的＆LT;＆DataProvider的GT;清单= listDataAdapter
.getSelectedIndexes（）; INT总和= 0;
的for（int i = 0; I＆LT;则为list.size（）;我++）{
的DataProvider的dataProvider = list.get（I） 总和=总和+ dataProvider.getCalorie（）; responseText.append（\\ n+ dataProvider.getName（）
+：+ dataProvider.getCalorie（）
+大卡
）; } Toast.makeText（getApplicationContext（），+ responseText的+\\ n+................................ 。
+\\ n+总热量在您的菜单是：+总和，
Toast.LENGTH_LONG）.show（）;
}
}）;
}
};
listView.setAdapter（listDataAdapter）;
foodDbHelper =新FoodDbHelper（getApplicationContext（））;
sqLiteDatabase = foodDbHelper.getReadableDatabase（）;
光标= foodDbHelper.getInformations（sqLiteDatabase）;
如果（cursor.moveToFirst（））{
做{
字符串名称，数量，脂肪，蛋白质，糖，维生素;
布尔选择= FALSE;
字符串名称= NULL;
整数热量; 名称= cursor.getString（0）;
量= cursor.getString（1）;
热量= Integer.valueOf（cursor.getString（2））;
脂肪= cursor.getString（3）;
蛋白质= cursor.getString（4）;
糖= cursor.getString（5）;
维生素= cursor.getString（6）; DataProvider的dataProvider中=新的DataProvider（名称，数量，
热量，脂肪，蛋白质，糖，维生素，姓名，选择的）; listDataAdapter.add（dataProvider中）; }而（cursor.moveToNext（））;
} listView.setOnItemClickListener（新AdapterView.OnItemClickListener（）{
@覆盖
公共无效onItemClick（适配器视图＆LT;＆GT;母公司，观景，
INT位置，长的id）{ 字符串名称=（字符串）（（的TextView）查看
.findViewById（R.id.text_dish_name））的getText（）。
串数量=（字符串）（（的TextView）查看
.findViewById（R.id.text_dish_quantity））的getText（）。
字符串热量=（字符串）（（的TextView）查看
.findViewById（R.id.text_dish_calorie））的getText（）。
字符串脂肪=（字符串）（（的TextView）查看
.findViewById（R.id.text_dish_fat））的getText（）。
串蛋白=（字符串）（（的TextView）查看
.findViewById（R.id.text_dish_protein））的getText（）。
串糖=（字符串）（（的TextView）查看
.findViewById（R.id.text_dish_sugar））的getText（）。
字符串维生素=（字符串）（（的TextView）查看
.findViewById（R.id.text_dish_vitamins））的getText（）。 将String.valueOf（parent.getItemAtPosition（位置））; Toast.makeText（getApplicationContext（），
这道菜的名字是：+姓名，Toast.LENGTH_SHORT）.show（）; 意向意图=新意图（getApplicationContext（）
Detail.class）;
intent.putExtra（菜名，名）;
intent.putExtra（菜量，数量）;
intent.putExtra（菜卡路里，热量）;
intent.putExtra（菜胖，脂肪）;
intent.putExtra（盘蛋白质，蛋白质）;
intent.putExtra（盘糖，糖）; intent.putExtra（这道菜维生素，维生素）; startActivity（意向）;
} }）;
} 公共无效gobackk（查看视图）{
意向意图=新意图（这一点，MainMenu.class）;
startActivity（意向）;
}
解决方案
相反的EditText的你可以在你的XML使用搜索查看？如果再在这里不是问题，你有完整的工作code。与适配器和XML的一切！
XML
＆LT;的RelativeLayout的xmlns：机器人=http://schemas.android.com/apk/res/android
的xmlns：工具=http://schemas.android.com/tools
机器人：layout_width =match_parent
机器人：layout_height =match_parent
工具：上下文=MyActivity。＆GT;＆LT;搜索查看
机器人：ID =@ + ID / searchPlayers
机器人：layout_width =match_parent
机器人：layout_height =WRAP_CONTENT
机器人：layout_alignParentLeft =真
机器人：layout_alignParentStart =真
机器人：背景=@彩色/ Blue600
机器人：layout_alignParentTop =真/＆GT;＆LT; ListView控件
机器人：ID =@ + ID / playersList
机器人：layout_width =match_parent
机器人：layout_height =match_parent
机器人：layout_below =@ + ID / searchPlayers
机器人：分=@彩色/蒂尔
机器人：dividerHeight =1DP
机器人：scrollingCache =假
机器人：smoothScrollbar =真/＆GT;
让您的mainActivity 扩展活动实现SearchView.OnQueryTextListener，可筛选，SearchView.OnCloseListener
里面MainActivity的的onCreate（）：
搜索查看=（搜索查看）findViewById（R.id.searchPlayers）; searchView.setOnQueryTextListener（本）;
searchView.setOnCloseListener（本）;
searchView.setQueryHint（由播放器搜索）;
在你MainActivity覆盖这些：
@覆盖
公共布尔onQueryTextChange（字符串newText）{名单将得到过滤，按输入。
如果（TextUtils.isEmpty（newText））{
listView.clearTextFilter（）;
。customAdapter.getFilter（）过滤（）;
}其他{
如果（customAdapter！= NULL）{
PlayersCustomAdapter CA =（PlayersCustomAdapter）listView.getAdapter（）;
。ca.getFilter（）过滤器（newText）;
}
}
返回true;
}@覆盖
公共布尔onQueryTextSubmit（字符串ABC）{
返回false;
}@覆盖
公共android.widget.Filter用getFilter（）{
返回null;
}@覆盖
公共布尔的OnClose（）{//将列表设置为初始位置时，搜索查看被关闭
。customAdapter.getFilter（）过滤（）;
返回false;
}
下面是自定义适配器..！
公共类PlayersCustomAdapter扩展BaseAdapter实现过滤的{
上下文语境;
ArrayList的＆LT; PlayersMapper＆GT; playersMapperList，filteredplayersMapperList;公共PlayersCustomAdapter（上下文的背景下，ArrayList的＆LT; PlayersMapper＆GT;名单）{
超（）;
// PlayersMapper是模型〜映射器类，这里我有我从我的Web服务让所有的意见。
this.context =背景;
this.playersMapperList =清单;
}公共PlayersCustomAdapter（）{}
类ViewHolder {
保护的TextView tvPlayerName;
保护的TextView tvTeamName;
保护的TextView tvNationality;
保护ImageView的ivPlayerPic;
}@覆盖
公共过滤用getFilter（）{
返回新过滤器（）{ @覆盖
保护FilterResults performFiltering（CharSequence的约束）{
最后FilterResults filteringResult =新FilterResults（）;
最终的ArrayList＆LT; PlayersMapper＆GT; filterdResult =新的ArrayList＆LT; PlayersMapper＆GT;（）; 如果（filteredplayersMapperList == NULL）
filteredplayersMapperList =新的ArrayList＆LT; PlayersMapper＆GT;（playersMapperList）;
如果（约束！= NULL）{
如果（filteredplayersMapperList！= NULL
＆功放;＆安培; filteredplayersMapperList.size（）＆GT; 0）{ 对于（最终PlayersMapper pmObj：filteredplayersMapperList）{
如果（pmObj.PlayerName.contains（constraint.toString（）））
filterdResult.add（pmObj）;
}
}
filteringResult.values = filterdResult;
filteringResult.count = filterdResult.size（）;
}
返回filteringResult;
} @燮pressWarnings（未登记）
@覆盖
保护无效publishResults（CharSequence的约束，
FilterResults结果）{ 如果（results.count == 0）{
notifyDataSetInvalidated（）;
}其他{
playersMapperList =（ArrayList的＆LT; PlayersMapper＆GT;）results.values;
notifyDataSetChanged（）;
} } };
}公共无效notifyDataSetChanged（）{
super.notifyDataSetChanged（）;
}@覆盖
公众诠释的getCount（）{ 返回playersMapperList.size（）;
}@覆盖
公共对象的getItem（INT位置）{ 返回playersMapperList.get（位置）;
}@覆盖
众长getItemId（INT POS）{
返回POS;
}@覆盖
公共查看getView（最终诠释的立场，观点convertView，父母的ViewGroup）{
查看查看= NULL;
LayoutInflater充气=（（活动）上下文）.getLayoutInflater（）;
鉴于= inflator.inflate（R.layout.players_item，NULL）; 最后ViewHolder viewHolder =新ViewHolder（）; viewHolder.tvPlayerName =（TextView的）查看
.findViewById（R.id.txtViewPlayerName）;
viewHolder.tvTeamName =（TextView的）查看
.findViewById（R.id.txtViewTeamName）;
viewHolder.tvNationality =（TextView的）查看
.findViewById（R.id.txtViewCountryName）;
viewHolder.ivPlayerPic =（ImageView的）查看
.findViewById（R.id.imgViewPlayers）; view.setTag（viewHolder）; ViewHolder支架=（ViewHolder）view.getTag（）;
holder.tvPlayerName.setText（playersMapperList.get（位置）.PlayerName）;
holder.tvTeamName.setText（playersMapperList.get（位置）.TeamName）;
holder.tvNationality
.setText（playersMapperList.get（位置）.Nationality）;
返回视图。
}}
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);
}
解决方案
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;
}
}
这篇关于Android的ListView的带过滤器的问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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