16

这是我的主要活动

package com.javacodegeeks.android.lbs;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.Toast;
import lbs.promotion.*;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.apache.http.NameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.AdapterView.OnItemClickListener;

public class Curve extends Activity {

    private ProgressDialog pDialog;
     JSONParser jParser = new JSONParser();
     ArrayList<HashMap<String, String>> DaftarPromotion = new ArrayList<HashMap<String, String>>();

     private static String url_daftar_promotion = "http://10.0.2.2/webserver_maaug/promotion/daftar_promotion.php";

     String lon = "101.5178";
     String lat = "3.0724";

     public static final String TAG_SUCCESS = "success";
     public static final String TAG_DAFTAR_PROMOTION = "daftar_promotion";
     public static final String TAG_ID_PROMO = "PromoID";
     public static final String TAG_NAMA_PROMO = "PromoName";
     public static final String TAG_LINK_IMAGE_PROMO = "PromoImage";
     public static final String TAG_DESC_PROMO= "PromoDesc";
     public static final String TAG_CATE_PROMO = "PromoCate";
     public static final String TAG_CONT_PROMO = "PromoContact";
     public static final String TAG_DATES_PROMO = "PromoDateStart";
     public static final String TAG_DATEE_PROMO = "PromoDateEnd";

     JSONArray daftar_promotion = null;

     ListView list;

     PromotionListAdapter adapter;

     EditText inputSearch;

     private Curve activity;

     @Override
     public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.activity_curve);
     DaftarPromotion = new ArrayList<HashMap<String, String>>();

      new Activity().execute();
      activity = this;
      list = (ListView) findViewById(R.id.list);

      inputSearch = (EditText) findViewById(R.id.search_box);

      inputSearch.addTextChangedListener(new TextWatcher() {

            @Override
            public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
                // When user changed the Text
                Curve.this.adapter.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
            }
        }); 




      list.setOnItemClickListener(new OnItemClickListener() {
      @Override
      public void onItemClick(AdapterView<?> parent, View view,
      int position, long id) {
          HashMap<String, String> map = DaftarPromotion.get(position);
          String pna = map.get(TAG_NAMA_PROMO);
          String pde = map.get(TAG_DESC_PROMO);
          String pca = map.get(TAG_CATE_PROMO);
          String pcon = map.get(TAG_CONT_PROMO);
          String pds = map.get(TAG_DATES_PROMO);
          String pdae = map.get(TAG_DATEE_PROMO);



            Toast.makeText(Curve.this, pna +"\n" + pde +"\n" + pca +"\n" + pds +" to " + pdae +"\n" + pcon,Toast.LENGTH_LONG).show();

      }
      }); 



      }


     public boolean onCreateOptionsMenu(Menu menu) {
            MenuInflater inflater = getMenuInflater();
            inflater.inflate(R.menu.smenu, menu);
            return true;
        }
     public boolean onOptionsItemSelected(MenuItem item) {
         switch (item.getItemId()) {
            case R.id.about:
                 Toast.makeText(Curve.this,"Mobile Advertising Application Using GPS V1.0",Toast.LENGTH_LONG).show();
            return true;
            case R.id.search:{
                 Intent intent = new Intent(Curve.this, Search.class);
                 intent.putExtra("lon",lon);
                 intent.putExtra("lat",lat);
                 startActivity(intent);
            //startActivity(new Intent(this, Search.class));

            }
            return true;
            default:
            return super.onOptionsItemSelected(item);
        }
        }

      public void SetListViewAdapter(ArrayList<HashMap<String, String>> daftar) {
      adapter = new PromotionListAdapter(activity, daftar);
      list.setAdapter(adapter);
      }

      @Override
      protected void onActivityResult(int requestCode, int resultCode, Intent data) {
      super.onActivityResult(requestCode, resultCode, data);
      if (resultCode == 100) {
      Intent intent = getIntent();
      finish();
      startActivity(intent);
      }
      }

      class Activity extends AsyncTask<String, String, String> {

      @Override
      protected void onPreExecute() {
      super.onPreExecute();
      pDialog = new ProgressDialog(Curve.this);
      pDialog.setMessage("Please Wait...");
      pDialog.setIndeterminate(false);
      pDialog.setCancelable(false);
      pDialog.show();
      }

      protected String doInBackground(String... args) {
      List<NameValuePair> params = new ArrayList<NameValuePair>();
      JSONObject json = jParser.makeHttpRequest(url_daftar_promotion, "GET",params);

      Log.d("All Products: ", json.toString());
      try {
      int success = json.getInt(TAG_SUCCESS);
      if (success == 1) {
           daftar_promotion = json.getJSONArray(TAG_DAFTAR_PROMOTION);
           for (int i = 0; i < daftar_promotion.length();i++){
           JSONObject c = daftar_promotion.getJSONObject(i);
           String PromoID = c.getString(TAG_ID_PROMO);
           String PromoName = c.getString(TAG_NAMA_PROMO);
           String pat = "http://10.0.2.2/webserver_maaug/";
           String PromoImage = pat + c.getString(TAG_LINK_IMAGE_PROMO);
           String PromoDesc = c.getString(TAG_DESC_PROMO);
           String PromoCate = c.getString(TAG_CATE_PROMO);
           String PromoDateStart = c.getString(TAG_DATES_PROMO);
           String PromoDateEnd = c.getString(TAG_DATEE_PROMO);
           String PromoContact = c.getString(TAG_CONT_PROMO);

           HashMap<String, String> map = new HashMap<String, String>();

           map.put(TAG_ID_PROMO, PromoID);
           map.put(TAG_NAMA_PROMO, PromoName);
           map.put(TAG_LINK_IMAGE_PROMO, PromoImage);
           map.put(TAG_DESC_PROMO, PromoDesc);
           map.put(TAG_CATE_PROMO, PromoCate);
           map.put(TAG_DATES_PROMO, PromoDateStart);
           map.put(TAG_DATEE_PROMO, PromoDateEnd);
           map.put(TAG_CONT_PROMO, PromoContact);

           DaftarPromotion.add(map);
           }

           } else {
           }
           } catch (JSONException e) {
           e.printStackTrace();
           }
           return null;
           }

           protected void onPostExecute(String file_url) {
           pDialog.dismiss();
           runOnUiThread(new Runnable() {
           public void run() {

           SetListViewAdapter(DaftarPromotion);




                }
           });
        }
    }
    }

这是我的自定义适配器，它非常简单，没有自己的对象类

package lbs.promotion;

import java.util.ArrayList;
import java.util.HashMap;

import com.javacodegeeks.android.lbs.Curve;
import com.javacodegeeks.android.lbs.R;

import android.app.Activity;
import android.content.Context;
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 PromotionListAdapter extends BaseAdapter {

 private Activity activity;
 private ArrayList<HashMap<String, String>> data;
 private static LayoutInflater inflater = null;
 public ImageLoader imageLoader;

 public PromotionListAdapter(Activity a, ArrayList<HashMap<String, String>> d) {

 activity = a;
 data = d;
 inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
 imageLoader = new ImageLoader(activity.getApplicationContext());
 }

 public int getCount() {
 return data.size();
 }

 public Object getItem(int position) {
 return position;
 }

 public long getItemId(int position) {
 return position;
 }

 public View getView(int position, View convertView, ViewGroup parent) {

     View vi = convertView;
      if (convertView == null)vi = inflater.inflate(R.layout.item_list_promotion, null);

      TextView PromoID = (TextView) vi.findViewById(R.id.PromoID);
      TextView PromoName = (TextView) vi.findViewById(R.id.PromoName);
      TextView PromoImage = (TextView) vi.findViewById(R.id.PromoImage);
      TextView PromoDesc = (TextView) vi.findViewById(R.id.PromoDesc);
      TextView PromoCate = (TextView) vi.findViewById(R.id.PromoCate);
      TextView PromoContact = (TextView) vi.findViewById(R.id.PromoContact);
      TextView PromoDateStart = (TextView) vi.findViewById(R.id.PromoDateStart);
      TextView PromoDateEnd = (TextView) vi.findViewById(R.id.PromoDateEnd);
      ImageView thumb_image = (ImageView) vi.findViewById(R.id.image_promo);

      HashMap<String, String> daftar_promotion = new HashMap<String, String>();
      daftar_promotion = data.get(position);

      PromoID.setText(daftar_promotion.get(Curve.TAG_ID_PROMO));

      PromoName.setText(daftar_promotion.get(Curve.TAG_NAMA_PROMO));

      PromoImage.setText(daftar_promotion.get(Curve.TAG_LINK_IMAGE_PROMO));

      PromoDesc.setText(daftar_promotion.get(Curve.TAG_DESC_PROMO));

      PromoCate.setText(daftar_promotion.get(Curve.TAG_CATE_PROMO));

      PromoContact.setText(daftar_promotion.get(Curve.TAG_CONT_PROMO));

      PromoDateStart.setText(daftar_promotion.get(Curve.TAG_DATES_PROMO));

      PromoDateEnd.setText(daftar_promotion.get(Curve.TAG_DATEE_PROMO));

      imageLoader.DisplayImage(daftar_promotion.get(Curve.TAG_LINK_IMAGE_PROMO),thumb_image);

      return vi;

      }




}

这是我的 layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >

 <!-- Editext for Search -->
    <EditText android:id="@+id/search_box"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:hint="type to search"
        android:inputType="text"
        android:maxLines="1"/>

<ListView
android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:divider="#040404"
android:dividerHeight="1dp"
android:listSelector="@drawable/list_selector" />

</LinearLayout>

如何让 getfilter() 函数工作？或者有没有更简单的方法在我的列表视图中实现过滤？我想根据我的 PromoName 过滤

4

2 回答 2

60

过滤器有两个主要组件，performFiltering(CharSequence)方法和publishResults(CharSequence, FilterResults)方法。在您的 PromotionListAdapter 中，您需要实现 Filterable 接口，然后覆盖 getFilter() 方法以返回一个已实现这些方法的新过滤器。

该performFiltering(CharSequence)方法是您完成大部分工作的地方。CharSequence 参数是您要过滤的数据。在这里，您首先要确定是否应该将列表过滤为基本情况。决定执行过滤后，为过滤后的数据集创建一个新的 ArrayList（在您的情况下是一个新的 ArrayList>），然后循环遍历您的完整列表项集，将与过滤器匹配的值添加到新的 ArrayList .

该performFiltering方法的返回类型是 FilterResults。FilterResults 是一个具有两个变量的简单对象，int count并且Object results. 使用过滤后的数据创建新的 ArrayList 后，创建一个新的 FilterResults，将performFiltering新的 ArrayList 设置为结果，并将该 ArrayList 的大小设置为计数。

返回后调用该publishResults(CharSequence, FilterResults)方法performFiltering()。CharSequence 参数与您过滤的字符串相同。FilterResults 参数是从performFiltering(). 在此方法中，您需要将新的 ArrayList 设置为 List 的数据源，然后调用notifyDataSetChanged()以更新 UI。

为了实现这一点，当我的适配器跟踪数据的原始 ArrayList 和当前显示的过滤 ArrayList 时，我已经取得了成功。下面是一些基于您的适配器的样板代码，可以帮助您入门。我已经在重要的行上发表了评论。

public class PromotionListAdapter extends BaseAdapter implements Filterable
{
    private Activity activity;
    private static LayoutInflater inflater = null;
    public ImageLoader imageLoader;

    //Two data sources, the original data and filtered data
    private ArrayList<HashMap<String, String>> originalData;
    private ArrayList<HashMap<String, String>> filteredData;

    public PromotionListAdapter(Activity a, ArrayList<HashMap<String, String>> d) 
    {
        activity = a;
        inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        imageLoader = new ImageLoader(activity.getApplicationContext());

        //To start, set both data sources to the incoming data
        originalData = d;
        filteredData = d;
    }

    //For this helper method, return based on filteredData
    public int getCount() 
    {
        return filteredData.size();
    }

    //This should return a data object, not an int
    public Object getItem(int position) 
    {
        return filteredData.get(position);
    }

    public long getItemId(int position) 
    {
        return position;
    }

    //The only change here is that we'll use filteredData.get(position)
    //Even better would be to use getItem(position), which uses the helper method (see the getItem() method above)
    public View getView(int position, View convertView, ViewGroup parent) 
    {

       View vi = convertView;
       if (convertView == null)vi = inflater.inflate(R.layout.item_list_promotion, null);

      TextView PromoID = (TextView) vi.findViewById(R.id.PromoID);
      TextView PromoName = (TextView) vi.findViewById(R.id.PromoName);
      TextView PromoImage = (TextView) vi.findViewById(R.id.PromoImage);
      TextView PromoDesc = (TextView) vi.findViewById(R.id.PromoDesc);
      TextView PromoCate = (TextView) vi.findViewById(R.id.PromoCate);
      TextView PromoContact = (TextView) vi.findViewById(R.id.PromoContact);
      TextView PromoDateStart = (TextView) vi.findViewById(R.id.PromoDateStart);
      TextView PromoDateEnd = (TextView) vi.findViewById(R.id.PromoDateEnd);
      ImageView thumb_image = (ImageView) vi.findViewById(R.id.image_promo);

      HashMap<String, String> daftar_promotion = new HashMap<String, String>();

      //Get data from filtered Data
      //This line can be replaced with:
      //     daftar_promotion = getItem(position);
      daftar_promotion = filteredData.get(position);

      PromoID.setText(daftar_promotion.get(Curve.TAG_ID_PROMO));

      PromoName.setText(daftar_promotion.get(Curve.TAG_NAMA_PROMO));

      PromoImage.setText(daftar_promotion.get(Curve.TAG_LINK_IMAGE_PROMO));

      PromoDesc.setText(daftar_promotion.get(Curve.TAG_DESC_PROMO));

      PromoCate.setText(daftar_promotion.get(Curve.TAG_CATE_PROMO));

      PromoContact.setText(daftar_promotion.get(Curve.TAG_CONT_PROMO));

      PromoDateStart.setText(daftar_promotion.get(Curve.TAG_DATES_PROMO));

      PromoDateEnd.setText(daftar_promotion.get(Curve.TAG_DATEE_PROMO));

      imageLoader.DisplayImage(daftar_promotion.get(Curve.TAG_LINK_IMAGE_PROMO),thumb_image);

      return vi;

    }

    @Override
    public Filter getFilter()
    {
       return new Filter()
       {
            @Override
            protected FilterResults performFiltering(CharSequence charSequence)
            {
                FilterResults results = new FilterResults();

                //If there's nothing to filter on, return the original data for your list
                if(charSequence == null || charSequence.length() == 0)
                {
                    results.values = originalData;
                    results.count = originalData.size();
                }
                else
                {
                    ArrayList<HashMap<String,String>> filterResultsData = new ArrayList<HashMap<String,String>>();

                    for(HashMap<String,String> data : originalData)
                    {
                        //In this loop, you'll filter through originalData and compare each item to charSequence.
                        //If you find a match, add it to your new ArrayList
                        //I'm not sure how you're going to do comparison, so you'll need to fill out this conditional
                        if(data matches your filter criteria)
                        {
                            filterResultsData.add(data);
                        }
                    }            

                    results.values = filterResultsData;
                    results.count = filteredResultsData.size();
                }

                return results;
            }

            @Override
            protected void publishResults(CharSequence charSequence, FilterResults filterResults)
            {
                filteredData = (ArrayList<HashMap<String,String>>)filterResults.values;
                notifyDataSetChanged();
            }
        };
    }
}

你有它！据我所知，您已经为您的 inputText EditText 正确设置了 TextWatcher，因此添加该getFilter()方法并对您的 Adapter 进行一些其他小的更改应该会引导您找到解决方案。我相信你也可以在你的适配器上为你的过滤器创建一个成员变量，所以你不会在每次调用 getFilter() 时创建一个新的类实例，但是我从我以前的项目中复制/粘贴了这个确保它以这种方式工作。玩它，看看什么对你有用！希望这可以帮助！如果您需要任何澄清，请发表评论。

于 2013-01-16T22:48:01.537 回答
3

您的适配器需要实现 Filterable 。

有关此（以及有关 listView）的更多信息，请观看视频“ listView 的世界”

这是一个示例代码：

http://codetheory.in/android-filters/

于 2013-01-17T00:03:28.783 回答