在使用用getFilter功能ListView控件是空白

在使用用getFilter功能ListView控件是空白

本文介绍了在使用用getFilter功能ListView控件是空白的处理方法,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

我试图实施用getFilter()函数在我的的ListView ,但每次我在的EditText 我的的ListView 消失。

我的 SetHelpRows 文件:

 公共类SetHelpRows {
    字符串名称;
    字符串ID;

    公共字符串的getName(){
        返回名称;
    }

    公共无效setname可以(字符串名称){
        this.name =名称;
    }

    公共字符串的getID(){
        返回ID;
    }

    公共无效SETID(字符串ID){
        this.id = ID;
    }

    公共SetHelpRows(字符串名称,字符串ID){
        超();
        this.name =名称;
        this.id = ID;
    }
}
 

我的 SetHelpRowsCustomAdapter 文件:

 进口的java.util.ArrayList;

进口android.app.Activity;
进口android.content.Context;
进口android.util.Log;
进口android.view.LayoutInflater;
进口android.view.View;
进口android.view.ViewGroup;
进口android.widget.ArrayAdapter;
进口android.widget.Filter;
进口android.widget.ImageView;
进口android.widget.TextView;

公共类SetRowsCustomAdapter扩展ArrayAdapter< SetRows> {
    上下文语境;
   INT layoutResourceId;
   ArrayList的< SetRows>数据=新的ArrayList< SetRows>();
   私人的ArrayList< SetRows>原版的;
   私人的ArrayList< SetRows> fitems;
   私人过滤器过滤;


   公共SetRowsCustomAdapter(上下文的背景下,诠释layoutResourceId,ArrayList的< SetRows>数据){
       超级(上下文,layoutResourceId,数据);
       this.layoutResourceId = layoutResourceId;
       this.context =背景;
       this.data =数据;

       this.original =数据; //新的ArrayList< Pkmn>();
       this.fitems =数据; //新的ArrayList< Pkmn>();
   }

   @覆盖
   公共查看getView(INT位置,查看convertView,ViewGroup中父){
       查看排= convertView;
       imageHolder的持有人= NULL;

       如果(行== NULL)
       {
           LayoutInflater充气=((活动)上下文).getLayoutInflater();
           行= inflater.inflate(layoutResourceId,父母,假);

           持有人=新imageHolder的();
           holder.txtTitle =(TextView中)row.findViewById(R.id.txtTitle);
           holder.imgIcon =(ImageView的)row.findViewById(R.id.imgIcon);
           holder.txtID =(TextView中)row.findViewById(R.id.txtModDate);
           row.setTag(保持器);
       }
       其他
       {
           支架=(imageHolder的)row.getTag();
       }

       SetRows MYIMAGE = data.get(位置);
       holder.txtTitle.setText(myImage.name);
       holder.txtID.setText(myImage.id);
       INT outImage = myImage.image;
       holder.imgIcon.setImageResource(outImage);
      返回行;

   }

   静态类imageHolder的
   {
       ImageView的imgIcon;
       TextView的txtTitle;
       TextView的txtID;
   }

   @覆盖
   公共过滤用getFilter()
   {
       如果(过滤== NULL){
           Log.i(过滤器前,过滤器前);
           过滤器=新PkmnNameFilter();
       }

       返回过滤器;
   }

   私有类PkmnNameFilter扩展过滤器
   {
           @覆盖
           保护FilterResults performFiltering(CharSequence的约束)
           {
               FilterResults结果=新FilterResults();
               字符串preFIX = constraint.toString()与toLowerCase()。

               如果(preFIX == NULL || prefix.length()== 0)
               {
                   Log.i(preFIX为空或0,preFIX为空或0);
                   ArrayList的< SetRows>名单=新的ArrayList< SetRows>(原件);
                   results.values​​ =清单;
                   results.count =则为list.size();
               }
               其他
               {
                   Log.i(preFIX为空或0!,preFIX为空或0!);
                   最后的ArrayList< SetRows>名单=新的ArrayList< SetRows>(原件);
                   最后的ArrayList< SetRows> NLIST =新的ArrayList< SetRows>();
                   诠释计数=则为list.size();

                   的for(int i = 0; I<计数;我++)
                   {
                       最终SetRows pkmn = list.get(ⅰ);
                       最终的字符串值= pkmn.getName()与toLowerCase()。

                       如果(value.startsWith(preFIX))
                       {
                           nlist.add(pkmn);
                       }
                   }
                   results.values​​ = NLIST;
                   results.count = nlist.size();
               }
               返回结果;
           }

           @燮pressWarnings(未登记)
           @覆盖
           保护无效publishResults(CharSequence的约束,FilterResults结果){

               Log.i(公布结果,发布结果);
               fitems =(ArrayList的< SetRows>)results.values​​;

               明确();
               诠释计数= fitems.size();
               的for(int i = 0; I<计数;我++)
               {
                   SetRows pkmn =(SetRows)fitems.get(ⅰ);
                   加(pkmn);
               }
           }

       }
}
 

我的偏 MainActivity 文件:

  inputSearch =(EditText上)findViewById(R.id.etSearch);
DataList控件=(ListView控件)findViewById(R.id.lvFiles);
对于(INT Y = 0; Y< strNames.length; Y ++){
    名称= strNamesOfAllah [Y]
    意思= strMeaning [Y]
    rowsArray.add(新SetRows(R.drawable.icon,名字,意思));
}
适配器=新SetRowsCustomAdapter(MainActivity.this,R.layout.customlist,rowsArray);
dataList.setAdapter(适配器);
dataList.setClickable(真正的);
inputSearch.addTextChangedListener(新TextWatcher(){
    @覆盖
    公共无效onTextChanged(CharSequence的CS,诠释ARG1,诠释ARG2,诠释ARG3){
        //当用户更改文本
        //MainActivity.this.adapter.getFilter().filter(cs);
        //字符串文本= inputSearch.getText()的toString()与toLowerCase()。
        。adapter.getFilter()滤波器(cs.toString()与toLowerCase(Locale.US));
    }

    @覆盖
    公共无效beforeTextChanged(CharSequence的arg0中,诠释ARG1,诠释ARG2,诠释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
    }
});
 

LogCat中我看到以下内容:

  12月12日至一十二日:15:57.077:I /前滤波器(720):在过滤器
十二月12号至12号:15:57.106:I / preFIX为空或0(720):!preFIX为空或0!
十二月12号至12号:15:57.216:I /公布结果(720):公布结果
 

解决方案

我修改了code,并能得到它的工作。如果有人想用它,是我的客人:)

SetRows的Java文件:

 公共类SetRows {
    INT形象;
    字符串名称;
    字符串ID;

    公众诠释的getImage(){
        返回形象;
    }

    公共无效setImage(INT图像){
        this.image =图像;
    }

    公共字符串的getName(){
        返回名称;
    }

    公共无效setname可以(字符串名称){
        this.name =名称;
    }

    公共字符串的getID(){
        返回ID;
    }

    公共无效SETID(字符串ID){
        this.id = ID;
    }

    公共SetRows(INT图像,字符串名称,字符串ID){
        超();
        this.image =图像;
        this.name =名称;
        this.id = ID;
    }

    @覆盖
    公共字符串的toString(){
        返回图像++姓名++ ID;
    }
}
 

SetRowsCustomAdapter的Java文件:

 进口的java.util.ArrayList;

进口android.app.Activity;
进口android.content.Context;
进口android.view.LayoutInflater;
进口android.view.View;
进口android.view.ViewGroup;
进口android.widget.ArrayAdapter;
进口android.widget.Filter;
进口android.widget.ImageView;
进口android.widget.TextView;

公共类SetRowsCustomAdapter扩展ArrayAdapter< SetRows> {
    上下文语境;
   INT layoutResourceId;
   ArrayList的< SetRows>数据=新的ArrayList< SetRows>(); //数据= countryList
   私人的ArrayList< SetRows> originalList;
   私人NameFilter过滤器;

   公共SetRowsCustomAdapter(上下文的背景下,诠释layoutResourceId,ArrayList的< SetRows>数据){
       超级(上下文,layoutResourceId,数据);
       this.layoutResourceId = layoutResourceId;
       this.context =背景;

       this.data =数据;
       //this.data.addAll(data);

       this.originalList =新的ArrayList< SetRows>();
       this.originalList.addAll(数据);
   }

   @覆盖
   公共查看getView(INT位置,查看convertView,ViewGroup中父){
       查看排= convertView;
       imageHolder的持有人= NULL;

       如果(行== NULL)
       {
           LayoutInflater充气=((活动)上下文).getLayoutInflater();
           行= inflater.inflate(layoutResourceId,父母,假);

           持有人=新imageHolder的();
           holder.txtTitle =(TextView中)row.findViewById(R.id.txtTitle);
           holder.imgIcon =(ImageView的)row.findViewById(R.id.imgIcon);
           holder.txtID =(TextView中)row.findViewById(R.id.txtModDate);
           row.setTag(保持器);
       }
       其他
       {
           支架=(imageHolder的)row.getTag();
       }

       SetRows MYIMAGE = data.get(位置);
       holder.txtTitle.setText(myImage.name);
       holder.txtID.setText(myImage.id);
       INT outImage = myImage.image;
       holder.imgIcon.setImageResource(outImage);
      返回行;

   }

   静态类imageHolder的
   {
       ImageView的imgIcon;
       TextView的txtTitle;
       TextView的txtID;
   }
   @覆盖
   公共过滤用getFilter(){
    如果(过滤== NULL){
     过滤器=新NameFilter();
    }
    返回过滤器;
   }
   私有类NameFilter扩展过滤器
   {

    @覆盖
    保护FilterResults performFiltering(CharSequence的约束){

     约束= constraint.toString()与toLowerCase()。
     FilterResults导致=新FilterResults();
     如果(约束= NULL和放大器;!&安培; constraint.toString()长度()大于0)
     {
     ArrayList的< SetRows> filteredItems =新的ArrayList< SetRows>();

     的for(int i = 0,L = originalList.size(); I<升;我++)
     {
      SetRows名单= originalList.get(我);
      如果(nameList.toString()。与toLowerCase()。包括(约束))
       filteredItems.add(名单);
     }
     result.count = filteredItems.size();
     result.values​​ = filteredItems;
     }
     其他
     {
      同步(这)
      {
       result.values​​ = originalList;
       result.count = originalList.size();
      }
     }
     返回结果;
    }

    @燮pressWarnings(未登记)
    @覆盖
    保护无效publishResults(CharSequence的约束,
      FilterResults结果){

     数据=(ArrayList的< SetRows>)results.values​​;
     notifyDataSetChanged();
     明确();
     的for(int i = 0,L = data.size(); I<升;我++)
      添加(data.get(一));
     notifyDataSetInvalidated();
    }
   }
}
 

其他一切保持不变:)

我希望人们会发现它有用为自己的应用程序。

I am trying to implement the getFilter() function in my ListView but everytime I enter something in the EditText my ListView disappears.

My SetHelpRows file:

public class SetHelpRows {
    String name;
    String id;

    public String getName () {
        return name;
    }

    public void setName (String name) {
        this.name = name;
    }

    public String getID () {
        return id;
    }

    public void setID (String id) {
        this.id = id;
    }

    public SetHelpRows(String name, String id) {
        super();
        this.name = name;
        this.id = id;
    }
}

My SetHelpRowsCustomAdapter file:

import java.util.ArrayList;

import android.app.Activity;
import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Filter;
import android.widget.ImageView;
import android.widget.TextView;

public class SetRowsCustomAdapter extends ArrayAdapter<SetRows> {
    Context context;
   int layoutResourceId;
   ArrayList<SetRows> data=new ArrayList<SetRows>();
   private ArrayList<SetRows> original;
   private ArrayList<SetRows> fitems;
   private Filter filter;


   public SetRowsCustomAdapter(Context context, int layoutResourceId, ArrayList<SetRows> data) {
       super(context, layoutResourceId, data);
       this.layoutResourceId = layoutResourceId;
       this.context = context;
       this.data = data;

       this.original = data;//new ArrayList<Pkmn>();
       this.fitems = data;//new ArrayList<Pkmn>();
   }

   @Override
   public View getView(int position, View convertView, ViewGroup parent) {
       View row = convertView;
       ImageHolder holder = null;

       if(row == null)
       {
           LayoutInflater inflater = ((Activity)context).getLayoutInflater();
           row = inflater.inflate(layoutResourceId, parent, false);

           holder = new ImageHolder();
           holder.txtTitle = (TextView)row.findViewById(R.id.txtTitle);
           holder.imgIcon = (ImageView)row.findViewById(R.id.imgIcon);
           holder.txtID = (TextView)row.findViewById(R.id.txtModDate);
           row.setTag(holder);
       }
       else
       {
           holder = (ImageHolder)row.getTag();
       }

       SetRows myImage = data.get(position);
       holder.txtTitle.setText(myImage.name);
       holder.txtID.setText(myImage.id);
       int outImage=myImage.image;
       holder.imgIcon.setImageResource(outImage);
      return row;

   }

   static class ImageHolder
   {
       ImageView imgIcon;
       TextView txtTitle;
       TextView txtID;
   }

   @Override
   public Filter getFilter()
   {
       if (filter == null) {
           Log.i("Before Filter", "Before Filter");
           filter = new PkmnNameFilter();
       }

       return filter;
   }

   private class PkmnNameFilter extends Filter
   {
           @Override
           protected FilterResults performFiltering(CharSequence constraint)
           {
               FilterResults results = new FilterResults();
               String prefix = constraint.toString().toLowerCase();

               if (prefix == null || prefix.length() == 0)
               {
                   Log.i("prefix is null or 0", "prefix is null or 0");
                   ArrayList<SetRows> list = new ArrayList<SetRows>(original);
                   results.values = list;
                   results.count = list.size();
               }
               else
               {
                   Log.i("prefix is !null or !0", "prefix is !null or !0");
                   final ArrayList<SetRows> list = new ArrayList<SetRows>(original);
                   final ArrayList<SetRows> nlist = new ArrayList<SetRows>();
                   int count = list.size();

                   for (int i=0; i<count; i++)
                   {
                       final SetRows pkmn = list.get(i);
                       final String value = pkmn.getName().toLowerCase();

                       if (value.startsWith(prefix))
                       {
                           nlist.add(pkmn);
                       }
                   }
                   results.values = nlist;
                   results.count = nlist.size();
               }
               return results;
           }

           @SuppressWarnings("unchecked")
           @Override
           protected void publishResults(CharSequence constraint, FilterResults results) {

               Log.i("publish result", "publish result");
               fitems = (ArrayList<SetRows>)results.values;

               clear();
               int count = fitems.size();
               for (int i=0; i<count; i++)
               {
                   SetRows pkmn = (SetRows)fitems.get(i);
                   add(pkmn);
               }
           }

       }
}

My partial MainActivity file:

inputSearch = (EditText) findViewById(R.id.etSearch);
dataList = (ListView) findViewById(R.id.lvFiles);
for (int y=0; y<strNames.length;y++) {
    name = strNamesOfAllah[y];
    meaning = strMeaning[y];
    rowsArray.add(new SetRows(R.drawable.icon, name, meaning));
}
adapter = new SetRowsCustomAdapter(MainActivity.this, R.layout.customlist, rowsArray);
dataList.setAdapter(adapter);
dataList.setClickable(true);
inputSearch.addTextChangedListener(new TextWatcher() {
    @Override
    public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
        // When user changed the Text
        //MainActivity.this.adapter.getFilter().filter(cs);
        //String text = inputSearch.getText().toString().toLowerCase();
        adapter.getFilter().filter(cs.toString().toLowerCase(Locale.US));
    }

    @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
    }
});

In the LogCat I do see the following:

12-12 12:15:57.077: I/Before Filter(720): Before Filter
12-12 12:15:57.106: I/prefix is !null or !0(720): prefix is !null or !0
12-12 12:15:57.216: I/publish result(720): publish result
解决方案

I modified my code and was able to get it to work. If anyone wants to use it, be my guest :)

SetRows Java file:

public class SetRows {
    int image;
    String name;
    String id;

    public int getImage () {
        return image;
    }

    public void setImage (int image) {
        this.image = image;
    }

    public String getName () {
        return name;
    }

    public void setName (String name) {
        this.name = name;
    }

    public String getID () {
        return id;
    }

    public void setID (String id) {
        this.id = id;
    }

    public SetRows(int image, String name, String id) {
        super();
        this.image = image;
        this.name = name;
        this.id = id;
    }

    @Override
    public String toString() {
        return  image + " " + name + " " + id;
    }
}

SetRowsCustomAdapter Java file:

import java.util.ArrayList;

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.ImageView;
import android.widget.TextView;

public class SetRowsCustomAdapter extends ArrayAdapter<SetRows> {
    Context context;
   int layoutResourceId;
   ArrayList<SetRows> data=new ArrayList<SetRows>(); //data = countryList
   private ArrayList<SetRows> originalList;
   private NameFilter filter;

   public SetRowsCustomAdapter(Context context, int layoutResourceId, ArrayList<SetRows> data) {
       super(context, layoutResourceId, data);
       this.layoutResourceId = layoutResourceId;
       this.context = context;

       this.data = data;
       //this.data.addAll(data);

       this.originalList = new ArrayList<SetRows>();
       this.originalList.addAll(data);
   }

   @Override
   public View getView(int position, View convertView, ViewGroup parent) {
       View row = convertView;
       ImageHolder holder = null;

       if(row == null)
       {
           LayoutInflater inflater = ((Activity)context).getLayoutInflater();
           row = inflater.inflate(layoutResourceId, parent, false);

           holder = new ImageHolder();
           holder.txtTitle = (TextView)row.findViewById(R.id.txtTitle);
           holder.imgIcon = (ImageView)row.findViewById(R.id.imgIcon);
           holder.txtID = (TextView)row.findViewById(R.id.txtModDate);
           row.setTag(holder);
       }
       else
       {
           holder = (ImageHolder)row.getTag();
       }

       SetRows myImage = data.get(position);
       holder.txtTitle.setText(myImage.name);
       holder.txtID.setText(myImage.id);
       int outImage=myImage.image;
       holder.imgIcon.setImageResource(outImage);
      return row;

   }

   static class ImageHolder
   {
       ImageView imgIcon;
       TextView txtTitle;
       TextView txtID;
   }
   @Override
   public Filter getFilter() {
    if (filter == null){
     filter  = new NameFilter();
    }
    return filter;
   }
   private class NameFilter extends Filter
   {

    @Override
    protected FilterResults performFiltering(CharSequence constraint) {

     constraint = constraint.toString().toLowerCase();
     FilterResults result = new FilterResults();
     if(constraint != null && constraint.toString().length() > 0)
     {
     ArrayList<SetRows> filteredItems = new ArrayList<SetRows>();

     for(int i = 0, l = originalList.size(); i < l; i++)
     {
      SetRows nameList = originalList.get(i);
      if(nameList.toString().toLowerCase().contains(constraint))
       filteredItems.add(nameList);
     }
     result.count = filteredItems.size();
     result.values = filteredItems;
     }
     else
     {
      synchronized(this)
      {
       result.values = originalList;
       result.count = originalList.size();
      }
     }
     return result;
    }

    @SuppressWarnings("unchecked")
    @Override
    protected void publishResults(CharSequence constraint,
      FilterResults results) {

     data = (ArrayList<SetRows>)results.values;
     notifyDataSetChanged();
     clear();
     for(int i = 0, l = data.size(); i < l; i++)
      add(data.get(i));
     notifyDataSetInvalidated();
    }
   }
}

Everything else stayed the same :)

I hope people find it useful for their own app.

这篇关于在使用用getFilter功能ListView控件是空白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!

08-19 22:13