如何实现用getFilter（）与扩展baseadapter自定义适配器自定义、适配器、如何实现、baseadapter
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);
}
});
}
}
}
这是我的自定义接口，这是一个非常简单的，没有它自己的对象类
and this is my custom adapter, it is a very simple one, without an object class of it's own
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
here is my 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>
我如何获得用getFilter（）函数的工作？或者是有我的列表视图来实现过滤任何简单的方法？我想根据我的PromoName过滤
how do i get the getfilter() function working? or is there any simpler way to implement filtering in my listview? i want to filter based on my PromoName
推荐答案
一个过滤器有两个主要组成部分，在 performFiltering（CharSequence中）方法和 publishResults（CharSequence的，FilterResults）方法。在您的PromotionListAdapter，你需要实现过滤的接口，然后重写用getFilter（）方法返回一个新的过滤器具有这些方法来实现。
A Filter has two major components, the performFiltering(CharSequence) method and the publishResults(CharSequence, FilterResults) method. In your PromotionListAdapter, you'll need to implement the Filterable interface then Override the getFilter() method to return a new Filter that has these methods implemented.
在 performFiltering（CharSequence中）方法，在这里你会做你的大部分工作。该CharSequence参数是你过滤上的数据。在这里，你首先要确定名单甚至应该被过滤的基本情况。一旦你决定进行过滤，为您过滤数据集创建一个新的ArrayList（在你的情况下，一个新的ArrayList>）可通过一套完整的列表项和循环，增加过滤器匹配到新的ArrayList中的值
The performFiltering(CharSequence) method is where you'll do the bulk of your work. The CharSequence argument is the data which you're filtering on. Here, you'll first want to determine if the list should even be filtered as the base case. Once you've decided to perform the filtering, create a new ArrayList for your filtered dataset (in your case, a new ArrayList>), and loop through your complete set of list items, adding the values that match the filter to your new ArrayList.
为 performFiltering 方法的返回类型为FilterResults。 FilterResults是两个变量的简单对象，诠释计数和对象结果。一旦 performFiltering 创造了新的ArrayList用过滤后的数据，创建一个新的FilterResults，设置新的ArrayList的结果和ArrayList的作为计数的大小。
The return type for the performFiltering method is FilterResults. FilterResults is a simple object with two variables, int count and Object results. Once performFiltering has created the new ArrayList with the filtered data, create a new FilterResults, setting your new ArrayList as results and the size of that ArrayList as count.
在 publishResults（CharSequence的，FilterResults）方法之后 performFiltering（）返回被调用。该CharSequence的参数是相同的字符串你被筛选上。该FilterResults参数是 performFiltering回报（）。在这种方法中，你要设置你的新的ArrayList作为数据源，你的清单，然后调用 notifyDataSetChanged（）更新UI。
The publishResults(CharSequence, FilterResults) method is called after performFiltering() returns. The CharSequence parameter is the same String you were filtering on. The FilterResults parameter is the return from performFiltering(). In this method, you'll want to set your new ArrayList as the data source for your List and then call notifyDataSetChanged() to update the UI.
为了实现这一点，我已经成功时，我的适配器跟踪数据，无论是原ArrayList和什么是当前显示一个过滤的ArrayList。以下是根据您的适配器上的一些样板code，可以帮助您开始。我上面重要的行注释。
In order to implement this, I've had success when my Adapter keeps track of both the original ArrayList of data and a filtered ArrayList of what is currently being shown. Here's some boilerplate code based on your adapter that can help get you started. I've commented above important lines.
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();
}
};
}
}
和你有它！据我所知，你已经实现了TextWatcher您的inputText的EditText设置正确，所以添加用getFilter（）方法，使其他一些小的改动您适配器应该带你到一个解决方案。我相信你也可以创建你的适配器为您筛选的成员变量，这样你就不会每次都创建用getFilter（）被调用这个类的一个新实例，但我复制/的previous项目粘贴此矿山和相信是这样工作的。玩它，看看你的作品！希望这可以帮助！而且请不要评论，如果您有什么需要澄清。
And there you have it! As far as I can tell, you've already implemented the TextWatcher for your inputText EditText set up properly, so adding the getFilter() method and making a few other minor changes to your Adapter should lead you to a solution. I believe you can also create a member variable on your Adapter for your Filter, so you're not creating a new instance of the class each time getFilter() is called, but I copy/pasted this from a previous project of mine and am sure it works this way. Play with it and see what works for you! Hope this helps! And please do comment if you need anything clarified.
