实施搜索筛选器从服务器中检索的JSON数据 [英] implementing search filter for data from server retrieved as JSON
问题描述
从服务器中检索的JSON数据执行搜索过滤器
我所指向什么
我是什么能够做到
我能够通过添加一些数据给它进行搜索过滤器时,我认为简单的数组
ListOfContacts.java
公共类ListOfContacts延伸活动{
//声明变量
的JSONObject的JSONObject;
JSONArray jsonarray;
ListView控件列表视图;
ListViewAdapter适配器;
ProgressDialog mProgressDialog;
ArrayList的<&HashMap的LT;字符串,字符串>> ArrayList的;
静态字符串NAME =等级;
静态串旗=标志; @覆盖
公共无效的onCreate(捆绑savedInstanceState){
super.onCreate(savedInstanceState);
//从listview_main.xml视图
的setContentView(R.layout.listview_main);
//定位listview_main.xml列表视图
列表视图=(ListView控件)findViewById(R.id.listview); //执行DownloadJSON的AsyncTask
新DownloadJSON()执行();
} // DownloadJSON的AsyncTask
私有类DownloadJSON扩展的AsyncTask<太虚,太虚,太虚> { @覆盖
在preExecute保护无效(){
super.on preExecute();
//创建一个progressdialog
mProgressDialog =新ProgressDialog(ListOfContacts.this);
//设置progressdialog称号
//mProgressDialog.setTitle(\"Fetching信息);
//设置progressdialog消息
mProgressDialog.setMessage(正在加载...);
mProgressDialog.setIndeterminate(假);
//显示progressdialog
mProgressDialog.show();
} @覆盖
保护无效doInBackground(虚空...... PARAMS){
//创建一个数组
ArrayList的=新的ArrayList<&HashMap的LT;字符串,字符串>>();
//从给定的URL地址JSON对象
的JSONObject = JSONfunctions.getJSONfromURL(http://54.218.73.244:7004/DescriptionSortedPrice/); 尝试{
//找到在JSON数组名
jsonarray = jsonobject.getJSONArray(餐馆); 的for(int i = 0; I< jsonarray.length();我++){
HashMap的<字符串,字符串>地图=新的HashMap<字符串,字符串>();
的JSONObject = jsonarray.getJSONObject(ⅰ);
// Retrive JSON对象
map.put(ListOfContacts.NAME,jsonobject.getString(PERSON_NAME));
map.put(ListOfContacts.FLAGhttp://54.218.73.244:7004/\"+jsonobject.getString(\"Image_Name)); //设置JSON对象到数组
arraylist.add(地图);
}
}赶上(JSONException E){
Log.e(错误,e.getMessage());
e.printStackTrace();
}
返回null;
} @覆盖
保护无效onPostExecute(无效参数){
//将结果传递到ListViewAdapter.java
适配器=新ListViewAdapter(ListOfContacts.this,ArrayList的);
//适配器设置到ListView
listview.setAdapter(适配器);
//关闭progressdialog
mProgressDialog.dismiss();
}
}
}
listview_main.xml
<?XML版本=1.0编码=UTF-8&GT?;
< LinearLayout中的xmlns:机器人=http://schemas.android.com/apk/res/android
机器人:layout_width =match_parent
机器人:layout_height =match_parent
机器人:方向=垂直> <! - Editext搜索 - >
< EditText上机器人:ID =@ + ID / inputSearch
机器人:layout_width =FILL_PARENT
机器人:layout_height =WRAP_CONTENT
机器人:提示=搜索此处
安卓的inputType =textVisiblePassword/> < ListView控件
机器人:ID =@ + ID /列表视图
机器人:layout_width =match_parent
机器人:layout_height =WRAP_CONTENT>
< /&的ListView GT;< / LinearLayout中>
ListViewAdapter.java
公共类ListViewAdapter延伸BaseAdapter { //声明变量
上下文语境;
LayoutInflater吹气;
ArrayList的<&HashMap的LT;字符串,字符串>>数据;
ImageLoader的ImageLoader的;
HashMap的<字符串,字符串> resultp =新的HashMap<字符串,字符串>(); 公共ListViewAdapter(上下文的背景下,
ArrayList的<&HashMap的LT;字符串,字符串>>数组列表){
this.context =背景;
数据=数组列表;
ImageLoader的=新ImageLoader的(上下文);
} @覆盖
公众诠释的getCount(){
返回data.size();
} @覆盖
公共对象的getItem(INT位置){
返回null;
} @覆盖
众长getItemId(INT位置){
返回0;
} 公共查看getView(最终诠释的立场,观点convertView,父母的ViewGroup){
//声明变量
TextView的名称;
ImageView的标志; 吹气=(LayoutInflater)上下文
.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 查看ItemView控件= inflater.inflate(R.layout.listview_item,父母,假);
//获取位置
resultp = data.get(位置); //定位listview_item.xml的TextViews
名字=(TextView中)itemView.findViewById(R.id.RestaurantNameID);
标志=(ImageView的)itemView.findViewById(R.id.flag); name.setText(resultp.get(MainActivity.NAME));
imageLoader.DisplayImage(resultp.get(MainActivity.FLAG),旗);
//捕获ListView项点击 返回ItemView控件;
}
}
ImageLoader.java
公共类ImageLoader的{ 的MemoryCache的MemoryCache =新的MemoryCache();
FileCache fileCache;
私人地图< ImageView的,字符串> imageViews =集合
.synchronizedMap(新的WeakHashMap< ImageView的,字符串>());
ExecutorService的ExecutorService的;
//处理程序,以显示在UI线程图片
处理程序处理程序=新的处理程序(); 公共ImageLoader的(上下文的背景下){
fileCache =新FileCache(背景);
ExecutorService的= Executors.newFixedThreadPool(5);
} 最终诠释stub_id = R.drawable.ic_launcher; 公共无效DisplayImage(字符串URL,ImageView的ImageView的){
imageViews.put(ImageView的,URL);
位图位图= memoryCache.get(URL);
如果(位图!= NULL)
imageView.setImageBitmap(位图);
其他{
queuePhoto(URL,ImageView的);
imageView.setImageResource(stub_id);
}
} 私人无效queuePhoto(字符串URL,ImageView的ImageView的){
PhotoToLoad P =新PhotoToLoad(URL,ImageView的);
executorService.submit(新PhotosLoader(P));
} 私人位图getBitmap(字符串URL){
文件F = fileCache.getFile(URL); 位图B =去codeFILE(F);
如果(B!= NULL)
返回b; 从网上下载//图片
尝试{
位图位图= NULL;
URL =图片网址新的URL(网址);
HttpURLConnection的康恩=(HttpURLConnection类)图片网址
.openConnection();
conn.setConnectTimeout(30000);
conn.setReadTimeout(30000);
conn.setInstanceFollowRedirects(真);
InputStream为= conn.getInputStream();
OutputStream的OS =新的FileOutputStream(F);
Utils.CopyStream(是,OS);
os.close();
conn.disconnect();
位=去codeFILE(F);
返回位图;
}赶上(Throwable的前){
ex.printStackTrace();
如果(前的instanceof的OutOfMemoryError)
memoryCache.clear();
返回null;
}
} //德$ C $连拍影像的鳞它来减少内存消耗
私人位图德codeFILE(文件f){
尝试{
//德code图像尺寸
BitmapFactory.Options O =新BitmapFactory.Options();
o.inJustDe codeBounds = TRUE;
的FileInputStream流1 =新的FileInputStream(F);
BitmapFactory.de codeStream(STREAM1,空,O);
stream1.close(); //找到正确的比例值。它应该是2的幂。
//推荐大小512
最终诠释REQUIRED_SIZE = 70;
INT width_tmp = o.outWidth,height_tmp = o.outHeight;
int标= 1;
而(真){
如果(width_tmp / 2'; REQUIRED_SIZE
|| height_tmp / 2'; REQUIRED_SIZE)
打破;
width_tmp / = 2;
height_tmp / = 2;
规模* = 2;
} //德code。与inSampleSize
BitmapFactory.Options O2 =新BitmapFactory.Options();
o2.inSampleSize =规模;
流2的FileInputStream =新的FileInputStream(F);
位图位图= BitmapFactory.de codeStream(流2,空,O2);
stream2.close();
返回位图;
}赶上(FileNotFoundException异常五){
}赶上(IOException异常五){
e.printStackTrace();
}
返回null;
} //任务队列
私有类PhotoToLoad {
公共字符串的URL;
公共ImageView的ImageView的; 公共PhotoToLoad(字符串U,ImageView的我){
URL = U;
ImageView的= I;
}
} 类PhotosLoader实现Runnable {
PhotoToLoad photoToLoad; PhotosLoader(PhotoToLoad photoToLoad){
this.photoToLoad = photoToLoad;
} @覆盖
公共无效的run(){
尝试{
如果(imageViewReused(photoToLoad))
返回;
BMP位图= getBitmap(photoToLoad.url);
memoryCache.put(photoToLoad.url,BMP);
如果(imageViewReused(photoToLoad))
返回;
BitmapDisplayer BD =新BitmapDisplayer(BMP,photoToLoad);
handler.post(BD);
}赶上(的Throwable日){
th.printStackTrace();
}
}
} 布尔imageViewReused(PhotoToLoad photoToLoad){
字符串标记= imageViews.get(photoToLoad.imageView);
如果(标记== NULL ||!tag.equals(photoToLoad.url))
返回true;
返回false;
} //用在UI线程来显示位图
类BitmapDisplayer实现Runnable {
位图位图;
PhotoToLoad photoToLoad; 公共BitmapDisplayer(位图B,PhotoToLoad P){
位= B;
photoToLoad = P;
} 公共无效的run(){
如果(imageViewReused(photoToLoad))
返回;
如果(位图!= NULL)
photoToLoad.imageView.setImageBitmap(位图);
其他
photoToLoad.imageView.setImageResource(stub_id);
}
} 公共无效clearCache(){
memoryCache.clear();
fileCache.clear();
}}
我的JSON结构:
{
餐馆:[
{
Sl_no:1,
PERSON_NAME:萨尔曼·汗
IMAGE_NAME:image.jpg的
},
{
Sl_no:2,
PERSON_NAME:AmirKhan
IMAGE_NAME:c92beeaf5ba50e65.jpg
},
{
Sl_no:3,
PERSON_NAME:卡尔,
IMAGE_NAME:f2d835b73945ded2.jpg
},
我是什么不能做:如何实现搜索过滤器,当我们从服务器检索数据并填充列表视图
{编辑}
包com.example.datapostingproject;进口的java.util.ArrayList;
进口的java.util.HashMap;
进口org.json.JSONArray;
进口org.json.JSONException;
进口org.json.JSONObject;进口android.app.Activity;
进口android.app.ProgressDialog;
进口android.os.AsyncTask;
进口android.os.Bundle;
进口android.text.Editable;
进口android.util.Log;
进口android.widget.EditText;
进口android.widget.ListView;公共类ListOfContacts延伸活动{
//声明变量
的JSONObject的JSONObject;
JSONArray jsonarray;
ListView控件列表视图;
ListViewAdapter适配器;
ProgressDialog mProgressDialog;
ArrayList的<&HashMap的LT;字符串,字符串>> ArrayList的;
静态字符串NAME =等级;
静态串旗=标志;
的EditText mEditText; @覆盖
公共无效的onCreate(捆绑savedInstanceState){
super.onCreate(savedInstanceState);
//从listview_main.xml视图
的setContentView(R.layout.listview_main);
//定位listview_main.xml列表视图
列表视图=(ListView控件)findViewById(R.id.listview);
mEditText =(EditText上)findViewById(R.id.inputSearch);
//执行DownloadJSON的AsyncTask
新DownloadJSON()执行(); mEditText =(EditText上)findViewById(R.id.inputSearch);
mEditText.addTextChangedListener(新TextWatcher()
{ 公共无效afterTextChanged(编辑S)
{ } 公共无效beforeTextChanged(CharSequence中,诠释开始,诠释计数后INT)
{ } 公共无效onTextChanged(CharSequence中,诠释开始,诠释之前,诠释计数)
{ ArrayList的<&HashMap的LT;字符串,字符串>> arrayTemplist =新的ArrayList<&HashMap的LT;字符串,字符串>>();
。字符串搜索字符串= mEditText.getText()的toString();
的for(int i = 0; I< arraylist.size();我++)
{
字符串currentString = arraylist.get(I)获得(ListOfContacts.NAME);
如果(searchString.equalsIgnoreCase(currentString)
{
arrayTemplist.add(arraylist.get(I));
}
}
适配器=新ListViewAdapter(ListOfContacts.this,arrayTemplist);
listview.setAdapter(适配器);
}
});
}
} // DownloadJSON的AsyncTask
类DownloadJSON扩展的AsyncTask<太虚,太虚,太虚> { @覆盖
在preExecute保护无效(){
super.on preExecute();
//创建一个progressdialog
mProgressDialog =新ProgressDialog(ListOfContacts.this);
//设置progressdialog称号
//mProgressDialog.setTitle(\"Fetching信息);
//设置progressdialog消息
mProgressDialog.setMessage(正在加载...);
mProgressDialog.setIndeterminate(假);
//显示progressdialog
mProgressDialog.show();
} @覆盖
保护无效doInBackground(虚空...... PARAMS){
//创建一个数组
ArrayList的=新的ArrayList<&HashMap的LT;字符串,字符串>>();
//从给定的URL地址JSON对象
的JSONObject = JSONfunctions.getJSONfromURL(http://54.218.73.244:7004/DescriptionSortedPrice/); 尝试{
//找到在JSON数组名
jsonarray = jsonobject.getJSONArray(餐馆); 的for(int i = 0; I< jsonarray.length();我++){
HashMap的<字符串,字符串>地图=新的HashMap<字符串,字符串>();
的JSONObject = jsonarray.getJSONObject(ⅰ);
// Retrive JSON对象
map.put(ListOfContacts.NAME,jsonobject.getString(PERSON_NAME));
map.put(ListOfContacts.FLAGhttp://54.218.73.244:7004/\"+jsonobject.getString(\"Image_Name)); //设置JSON对象到数组
arraylist.add(地图);
}
}赶上(JSONException E){
Log.e(错误,e.getMessage());
e.printStackTrace();
}
返回null;
} @覆盖
保护无效onPostExecute(无效参数){
//将结果传递到ListViewAdapter.java
适配器=新ListViewAdapter(ListOfContacts.this,ArrayList的);
//适配器设置到ListView
listview.setAdapter(适配器);
//关闭progressdialog
mProgressDialog.dismiss();
}
}
}
在下面添加code中的OnCreate() ListOfContacts.java
mEditText =(EditText上)findViewById(R.id.inputSearch);
mEditText.addTextChangedListener(新TextWatcher()
{ 公共无效afterTextChanged(编辑S)
{ } 公共无效beforeTextChanged(CharSequence中,诠释开始,诠释计数后INT)
{ } 公共无效onTextChanged(CharSequence中,诠释开始,诠释之前,诠释计数)
{ ArrayList的<&HashMap的LT;字符串,字符串>> arrayTemplist =新的ArrayList<&HashMap的LT;字符串,字符串>>();
。字符串搜索字符串= mEditText.getText()的toString();
的for(int i = 0; I< arraylist.size();我++)
{
字符串currentString = arraylist.get(I)获得(ListOfContacts.NAME);
如果(searchString.equalsIgnoreCase(currentString)
{
arrayTemplist.add(arraylist.get(I));
}
}
适配器=新ListViewAdapter(ListOfContacts.this,arrayTemplist);
listview.setAdapter(适配器);
}
});
}
Implementing search filter for data from server retrieved as JSON What i refered
What i am able to do
I am able to perform search filter when i consider simple arrays by adding some data to it
ListOfContacts.java
public class ListOfContacts extends Activity {
// Declare Variables
JSONObject jsonobject;
JSONArray jsonarray;
ListView listview;
ListViewAdapter adapter;
ProgressDialog mProgressDialog;
ArrayList<HashMap<String, String>> arraylist;
static String NAME = "rank";
static String FLAG = "flag";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Get the view from listview_main.xml
setContentView(R.layout.listview_main);
// Locate the listview in listview_main.xml
listview = (ListView) findViewById(R.id.listview);
// Execute DownloadJSON AsyncTask
new DownloadJSON().execute();
}
// DownloadJSON AsyncTask
private class DownloadJSON extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Create a progressdialog
mProgressDialog = new ProgressDialog(ListOfContacts.this);
// Set progressdialog title
//mProgressDialog.setTitle("Fetching the information");
// Set progressdialog message
mProgressDialog.setMessage("Loading...");
mProgressDialog.setIndeterminate(false);
// Show progressdialog
mProgressDialog.show();
}
@Override
protected Void doInBackground(Void... params) {
// Create an array
arraylist = new ArrayList<HashMap<String, String>>();
// Retrieve JSON Objects from the given URL address
jsonobject = JSONfunctions.getJSONfromURL("http://54.218.73.244:7004/DescriptionSortedPrice/");
try {
// Locate the array name in JSON
jsonarray = jsonobject.getJSONArray("restaurants");
for (int i = 0; i < jsonarray.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
jsonobject = jsonarray.getJSONObject(i);
// Retrive JSON Objects
map.put(ListOfContacts.NAME, jsonobject.getString("Person_Name"));
map.put(ListOfContacts.FLAG, "http://54.218.73.244:7004/"+jsonobject.getString("Image_Name"));
// Set the JSON Objects into the array
arraylist.add(map);
}
} catch (JSONException e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void args) {
// Pass the results into ListViewAdapter.java
adapter = new ListViewAdapter(ListOfContacts.this, arraylist);
// Set the adapter to the ListView
listview.setAdapter(adapter);
// Close the progressdialog
mProgressDialog.dismiss();
}
}
}
listview_main.xml
<?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="vertical" >
<!-- Editext for Search -->
<EditText android:id="@+id/inputSearch"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="Search Here"
android:inputType="textVisiblePassword"/>
<ListView
android:id="@+id/listview"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
</LinearLayout>
ListViewAdapter.java
public class ListViewAdapter extends BaseAdapter {
// Declare Variables
Context context;
LayoutInflater inflater;
ArrayList<HashMap<String, String>> data;
ImageLoader imageLoader;
HashMap<String, String> resultp = new HashMap<String, String>();
public ListViewAdapter(Context context,
ArrayList<HashMap<String, String>> arraylist) {
this.context = context;
data = arraylist;
imageLoader = new ImageLoader(context);
}
@Override
public int getCount() {
return data.size();
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
public View getView(final int position, View convertView, ViewGroup parent) {
// Declare Variables
TextView name;
ImageView flag;
inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View itemView = inflater.inflate(R.layout.listview_item, parent, false);
// Get the position
resultp = data.get(position);
// Locate the TextViews in listview_item.xml
name = (TextView) itemView.findViewById(R.id.RestaurantNameID);
flag = (ImageView) itemView.findViewById(R.id.flag);
name.setText(resultp.get(MainActivity.NAME));
imageLoader.DisplayImage(resultp.get(MainActivity.FLAG), flag);
// Capture ListView item click
return itemView;
}
}
ImageLoader.java
public class ImageLoader {
MemoryCache memoryCache = new MemoryCache();
FileCache fileCache;
private Map<ImageView, String> imageViews = Collections
.synchronizedMap(new WeakHashMap<ImageView, String>());
ExecutorService executorService;
// Handler to display images in UI thread
Handler handler = new Handler();
public ImageLoader(Context context) {
fileCache = new FileCache(context);
executorService = Executors.newFixedThreadPool(5);
}
final int stub_id = R.drawable.ic_launcher;
public void DisplayImage(String url, ImageView imageView) {
imageViews.put(imageView, url);
Bitmap bitmap = memoryCache.get(url);
if (bitmap != null)
imageView.setImageBitmap(bitmap);
else {
queuePhoto(url, imageView);
imageView.setImageResource(stub_id);
}
}
private void queuePhoto(String url, ImageView imageView) {
PhotoToLoad p = new PhotoToLoad(url, imageView);
executorService.submit(new PhotosLoader(p));
}
private Bitmap getBitmap(String url) {
File f = fileCache.getFile(url);
Bitmap b = decodeFile(f);
if (b != null)
return b;
// Download Images from the Internet
try {
Bitmap bitmap = null;
URL imageUrl = new URL(url);
HttpURLConnection conn = (HttpURLConnection) imageUrl
.openConnection();
conn.setConnectTimeout(30000);
conn.setReadTimeout(30000);
conn.setInstanceFollowRedirects(true);
InputStream is = conn.getInputStream();
OutputStream os = new FileOutputStream(f);
Utils.CopyStream(is, os);
os.close();
conn.disconnect();
bitmap = decodeFile(f);
return bitmap;
} catch (Throwable ex) {
ex.printStackTrace();
if (ex instanceof OutOfMemoryError)
memoryCache.clear();
return null;
}
}
// Decodes image and scales it to reduce memory consumption
private Bitmap decodeFile(File f) {
try {
// Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
FileInputStream stream1 = new FileInputStream(f);
BitmapFactory.decodeStream(stream1, null, o);
stream1.close();
// Find the correct scale value. It should be the power of 2.
// Recommended Size 512
final int REQUIRED_SIZE = 70;
int width_tmp = o.outWidth, height_tmp = o.outHeight;
int scale = 1;
while (true) {
if (width_tmp / 2 < REQUIRED_SIZE
|| height_tmp / 2 < REQUIRED_SIZE)
break;
width_tmp /= 2;
height_tmp /= 2;
scale *= 2;
}
// Decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
FileInputStream stream2 = new FileInputStream(f);
Bitmap bitmap = BitmapFactory.decodeStream(stream2, null, o2);
stream2.close();
return bitmap;
} catch (FileNotFoundException e) {
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
// Task for the queue
private class PhotoToLoad {
public String url;
public ImageView imageView;
public PhotoToLoad(String u, ImageView i) {
url = u;
imageView = i;
}
}
class PhotosLoader implements Runnable {
PhotoToLoad photoToLoad;
PhotosLoader(PhotoToLoad photoToLoad) {
this.photoToLoad = photoToLoad;
}
@Override
public void run() {
try {
if (imageViewReused(photoToLoad))
return;
Bitmap bmp = getBitmap(photoToLoad.url);
memoryCache.put(photoToLoad.url, bmp);
if (imageViewReused(photoToLoad))
return;
BitmapDisplayer bd = new BitmapDisplayer(bmp, photoToLoad);
handler.post(bd);
} catch (Throwable th) {
th.printStackTrace();
}
}
}
boolean imageViewReused(PhotoToLoad photoToLoad) {
String tag = imageViews.get(photoToLoad.imageView);
if (tag == null || !tag.equals(photoToLoad.url))
return true;
return false;
}
// Used to display bitmap in the UI thread
class BitmapDisplayer implements Runnable {
Bitmap bitmap;
PhotoToLoad photoToLoad;
public BitmapDisplayer(Bitmap b, PhotoToLoad p) {
bitmap = b;
photoToLoad = p;
}
public void run() {
if (imageViewReused(photoToLoad))
return;
if (bitmap != null)
photoToLoad.imageView.setImageBitmap(bitmap);
else
photoToLoad.imageView.setImageResource(stub_id);
}
}
public void clearCache() {
memoryCache.clear();
fileCache.clear();
}
}
My JSON Structure::
{
"restaurants": [
{
"Sl_no": 1,
"Person_Name": "salmanKhan",
"Image_Name": "image.jpg"
},
{
"Sl_no": 2,
"Person_Name": "AmirKhan",
"Image_Name": "c92beeaf5ba50e65.jpg"
},
{
"Sl_no": 3,
"Person_Name": "carl",
"Image_Name": "f2d835b73945ded2.jpg"
},
What i am not able to do : How to implement search filter when we retrieve Data from server and populate the list view
{EDIT}
package com.example.datapostingproject;
import java.util.ArrayList;
import java.util.HashMap;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.text.Editable;
import android.util.Log;
import android.widget.EditText;
import android.widget.ListView;
public class ListOfContacts extends Activity {
// Declare Variables
JSONObject jsonobject;
JSONArray jsonarray;
ListView listview;
ListViewAdapter adapter;
ProgressDialog mProgressDialog;
ArrayList<HashMap<String, String>> arraylist;
static String NAME = "rank";
static String FLAG = "flag";
EditText mEditText;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Get the view from listview_main.xml
setContentView(R.layout.listview_main);
// Locate the listview in listview_main.xml
listview = (ListView) findViewById(R.id.listview);
mEditText = (EditText) findViewById(R.id.inputSearch);
// Execute DownloadJSON AsyncTask
new DownloadJSON().execute();
mEditText = (EditText) findViewById(R.id.inputSearch);
mEditText.addTextChangedListener(new TextWatcher()
{
public void afterTextChanged(Editable s)
{
}
public void beforeTextChanged(CharSequence s, int start,int count, int after)
{
}
public void onTextChanged(CharSequence s, int start,int before, int count)
{
ArrayList<HashMap<String, String>> arrayTemplist= new ArrayList<HashMap<String,String>>();
String searchString =mEditText.getText().toString();
for (int i = 0; i < arraylist.size(); i++)
{
String currentString =arraylist.get(i).get(ListOfContacts.NAME);
if (searchString.equalsIgnoreCase(currentString)
{
arrayTemplist.add(arraylist.get(i));
}
}
adapter = new ListViewAdapter(ListOfContacts.this, arrayTemplist);
listview.setAdapter(adapter);
}
});
}
}
// DownloadJSON AsyncTask
class DownloadJSON extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Create a progressdialog
mProgressDialog = new ProgressDialog(ListOfContacts.this);
// Set progressdialog title
//mProgressDialog.setTitle("Fetching the information");
// Set progressdialog message
mProgressDialog.setMessage("Loading...");
mProgressDialog.setIndeterminate(false);
// Show progressdialog
mProgressDialog.show();
}
@Override
protected Void doInBackground(Void... params) {
// Create an array
arraylist = new ArrayList<HashMap<String, String>>();
// Retrieve JSON Objects from the given URL address
jsonobject = JSONfunctions.getJSONfromURL("http://54.218.73.244:7004/DescriptionSortedPrice/");
try {
// Locate the array name in JSON
jsonarray = jsonobject.getJSONArray("restaurants");
for (int i = 0; i < jsonarray.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
jsonobject = jsonarray.getJSONObject(i);
// Retrive JSON Objects
map.put(ListOfContacts.NAME, jsonobject.getString("Person_Name"));
map.put(ListOfContacts.FLAG, "http://54.218.73.244:7004/"+jsonobject.getString("Image_Name"));
// Set the JSON Objects into the array
arraylist.add(map);
}
} catch (JSONException e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void args) {
// Pass the results into ListViewAdapter.java
adapter = new ListViewAdapter(ListOfContacts.this, arraylist);
// Set the adapter to the ListView
listview.setAdapter(adapter);
// Close the progressdialog
mProgressDialog.dismiss();
}
}
}
Add below code in OnCreate() method of ListOfContacts.java
mEditText = (EditText) findViewById(R.id.inputSearch);
mEditText.addTextChangedListener(new TextWatcher()
{
public void afterTextChanged(Editable s)
{
}
public void beforeTextChanged(CharSequence s, int start,int count, int after)
{
}
public void onTextChanged(CharSequence s, int start,int before, int count)
{
ArrayList<HashMap<String, String>> arrayTemplist= new ArrayList<HashMap<String,String>>();
String searchString =mEditText.getText().toString();
for (int i = 0; i < arraylist.size(); i++)
{
String currentString =arraylist.get(i).get(ListOfContacts.NAME);
if (searchString.equalsIgnoreCase(currentString)
{
arrayTemplist.add(arraylist.get(i));
}
}
adapter = new ListViewAdapter(ListOfContacts.this, arrayTemplist);
listview.setAdapter(adapter);
}
});
}
这篇关于实施搜索筛选器从服务器中检索的JSON数据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!