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How to get gridview multiple positions and store into array variable

Now I am displaying images in grid-view, it working fine. In that grid-view i am going to select few images, i want store selected multiple images position in array variable (example: if i select position 1, 4 ,10. i want that particular position id and i want to store it array like 1,4,10,15,). I will put my activity and adapter code below. Thank you in advance.
Activity
public class EM_event_total_userSeats extends AppCompatActivity implements RestCallback,AdapterView.OnItemClickListener {
String user_id,first_name,last_name,name,emailid,contact_no,gender1,date_of_birth,country_id,postal_code,rolename,profession_response,Street_Address,City,photo;
GridView GridUserSeats;
;
TextView textView1,textView2,Tvposition;
ImageView Ivseats;
public static EM_event_total_userseatsAdapter adapter;
ArrayList<EM_event_total_UserSeatsModel> EMeventuserseatslist;
View savedView;
View previous = null;
String event_id = "EVEPRI62";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.em_event_total_user_seats);
initviews();
callSeatsApi();
GridUserSeats.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {
String a = String.valueOf(position);
Toast.makeText(EM_event_total_userSeats.this, a + "#Selected", Toast.LENGTH_SHORT).show();
v.setBackgroundColor(Color.GREEN);
adapter.notifyDataSetChanged();
}
});
}
private void initviews() {
GridUserSeats=(GridView)findViewById(R.id.GridUserSeats);
GridUserSeats.setOnItemClickListener(this);
textView1=(TextView) findViewById(R.id.textView1);
// textView2=(TextView) findViewById(R.id.textView2);
Intent intent = getIntent();
first_name = intent.getStringExtra("first_name");
last_name = intent.getStringExtra("last_name");
}
private void callSeatsApi() {
HashMap<String, String> map = new HashMap<String, String>();
map.put("events", event_id);
RestService.getInstance(EM_event_total_userSeats.this).getUserSeats(map, new MyCallback<ArrayList<EM_event_total_UserSeatsModel>>(EM_event_total_userSeats.this,
EM_event_total_userSeats.this, true, "Finding seats....", GlobalVariables.SERVICE_MODE.EM_SEATS));
}
#Override
public void onFailure(Call call, Throwable t, GlobalVariables.SERVICE_MODE mode) {
}
#Override
public void onSuccess(Response response, GlobalVariables.SERVICE_MODE mode)
{
switch (mode)
{
case EM_SEATS:
EMeventuserseatslist = (ArrayList<EM_event_total_UserSeatsModel>)response.body();
adapter = new EM_event_total_userseatsAdapter(EMeventuserseatslist, getApplicationContext());
GridUserSeats.setAdapter(adapter);
break;
}
}
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
}
}
Adapter
import android.content.Context;
import android.content.Intent;
import android.support.annotation.NonNull;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.squareup.picasso.Picasso;
import java.util.ArrayList;
import java.util.List;
import cfirst.live.com.R;
import cfirst.live.com.model.BasketModel;
import cfirst.live.com.model.EM_event_total_UserSeatsModel;
public class EM_event_total_userseatsAdapter extends ArrayAdapter<EM_event_total_UserSeatsModel> implements View.OnClickListener {
ArrayList<EM_event_total_UserSeatsModel> dataSet;
public ArrayList<EM_event_total_UserSeatsModel> EMeventuserseatslist = new ArrayList<EM_event_total_UserSeatsModel>();
Context mContext;
ViewHolder holder;
String user_seats;
private int[] tagCollection;
private String[] mobileValues;
private String[] mobileValuesD;
private static class ViewHolder {
TextView TvEmUserSeats;
ImageView IvUsreSeats,available,selctedimag;
}
private String[] strings;
List<Integer> selectedPositions = new ArrayList<>();
public EM_event_total_userseatsAdapter(ArrayList<EM_event_total_UserSeatsModel> data, Context context) {
super(context, R.layout.list_em_get_seats, data);
this.dataSet = data;
this.mContext=context;
}
public int getTagFromPosition(int position) {
return tagCollection[position];
}
#Override
public void onClick(View v) {
int position=(Integer) v.getTag();
Object object= getItem(tagCollection[position]);
EM_event_total_UserSeatsModel dataModel=(EM_event_total_UserSeatsModel) object;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
// Get the data item for this position
EM_event_total_UserSeatsModel dataModel = getItem(position);
// Check if an existing view is being reused, otherwise inflate the view
ViewHolder viewHolder; // view lookup cache stored in tag
final View result;
if (convertView == null) {
viewHolder = new ViewHolder();
LayoutInflater inflater = LayoutInflater.from(getContext());
convertView = inflater.inflate(R.layout.list_em_get_seats, parent, false);
viewHolder.TvEmUserSeats = (TextView) convertView.findViewById(R.id.TvEmUserSeats);
viewHolder.IvUsreSeats = (ImageView) convertView.findViewById(R.id.IvUsreSeats);
result=convertView;
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
result=convertView;
}
String blue_available = "seat3.png";
String red_booked = "seat1.png";
String get_seat = dataModel.getBookedStatus();
viewHolder.TvEmUserSeats.setText(dataModel.getSeatName());
if(Integer.parseInt(get_seat) == 1){
Picasso.with(mContext).load("imageurl + red_booked).into(viewHolder.IvUsreSeats);
}else
{
Picasso.with(mContext).load("imageurl + blue_available).into(viewHolder.IvUsreSeats);
}
return convertView;
}
}

It's simple. You can use SparseBooleanArray for this purpose. Just add the following methods as is in your adapter:
public void toggleSelection(int item) {
if (selectedItems.get(item, false)) {
selectedItems.delete(item);
} else {
selectedItems.put(item, true);
}
notifyDataSetChanged();
}
public void setSelectedItems(List<Object> objects) {
if (objects != null) {
for (Object object : objects) {
toggleSelection(object.getId());
}
notifyDataSetChanged();
}
}
public void clearSelections() {
selectedItems.clear();
notifyDataSetChanged();
}
public int getSelectedItemCount() {
return selectedItems.size();
}
public List<Integer> getSelectedItems() {
List<Integer> items =
new ArrayList<Integer>(selectedItems.size());
for (int i = 0; i < selectedItems.size(); i++) {
items.add(selectedItems.keyAt(i));
}
return items;
}
Use the set selection method to store the selected status of your item.
Don't forget to initialize SparseBooleanArray in your constructor.
SparseBooleanArray SparseBooleanArray = new SparseBooleanArray();
After that, use toggleSelection(position); to change the selected status of an item, then after performing selections, call getSelectedItem() to get the selected items in an array.

// create an Arraylist and add the selected position in a list
List <int> selectedArray = new ArrayList<>();
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
int click = (int) parent.getItemAtPosition(position);
selectedArray.add(click);
}

My list view is not showing anything i have use array adapter and no error in logcat

I am not getting anything in the listview when i am running this code.
I am trying to get value from server in text view,i am getting value from server in payload object.but still my list view is not showing anything and there is no error in logcat.
import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import com.zalonstyles.app.zalon.Model.Services;
import com.zalonstyles.app.zalon.Model.ViewHolder;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
This is the class where i am getting data from server
public class popup_massage extends AppCompatActivity {
public static final String URL = "http://52.41.72.46:8080/service/get_category";
public final String serviceid = "6";
private ListView mainListView;
private Button check;
private List<Services> massagelist = new ArrayList<>();
private Services massageservice[];
private Context context;
public ArrayAdapter<Services> listAdapter;
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.popup_massage);
SharedPreferences mSharedPreference= PreferenceManager.getDefaultSharedPreferences(getBaseContext());
String value=(mSharedPreference.getString("AppConstant.AUTH_TOKEN", "DEFAULT"));
Log.e("accesslog",value);
mainListView = (ListView) findViewById(R.id.listView4);
check = (Button) findViewById(R.id.button4);
final JSONObject params = new JSONObject();
try {
params.put("service_id",serviceid);
} catch (JSONException e) {
e.printStackTrace();
}
try {
params.put("access_token", value);
} catch (JSONException e) {
e.printStackTrace();
}
StringRequest stringRequest = new StringRequest(Request.Method.POST, URL,
new Response.Listener<String>(){
#Override
public void onResponse(String response) {
Log.v("updateUPVolleyRes1",response);
try {
JSONObject jobject = new JSONObject(response);
JSONArray payload = jobject.getJSONArray("payload");
Log.e("payloaddata", String.valueOf(payload));
for (int i = 0; i < payload.length(); i++) {
try{
JSONObject obj = payload.getJSONObject(i);
Services service = new Services();
service.setName(obj.getString("name"));
service.setcategotry_id(obj.getString("id"));
massagelist.add(service);
}finally {
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.v("updateUPVolleyErr", error.toString());
}
}){
#Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params1 = new HashMap<String, String>();
params1.put("payload", params.toString());
Log.v("updateUPVolleyParams", params1.toString());
return params1;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
mainListView
.setOnItemClickListener(new AdapterView.OnItemClickListener()
{
#Override
public void onItemClick(AdapterView<?> parent, View item,
int position, long id)
{
Services massageservice = listAdapter.getItem(position);
Log.e("CHECKADAPTOR", String.valueOf(massageservice));
massageservice.toggleChecked();
ViewHolder viewHolder =(ViewHolder) item
.getTag();
viewHolder.getCheckBox().setChecked(massageservice.isChecked());
}
});
//Services[] massageService = (Services[]) getLastNonConfigurationInstance();ArrayList<Services> massagelist = new ArrayList<Services>();
//massagelist.addAll(Arrays.asList(massageService));
// Set our custom array adapter as the ListView's adapter.
listAdapter = new massageArrayAdapter(this,massagelist);
mainListView.setAdapter(listAdapter);
check.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View view)
{
for (int i = 0; i < listAdapter.getCount(); i++)
{
Services massage = listAdapter.getItem(i);
if (massage.isChecked())
{
Toast.makeText(getApplicationContext(),
massage.getName() + " is Checked!!",
Toast.LENGTH_SHORT).show();
Log.v("My Custom Tag", massage.getName());
}
}
}
});
}
//arrayadapter class//
private static class massageArrayAdapter extends ArrayAdapter<Services>
{
private LayoutInflater inflater;
public massageArrayAdapter(Context context, List<Services> massagelist)
{
super(context, R.layout.customlist_massage, R.id.massagetextview, massagelist);
// Cache the LayoutInflate to avoid asking for a new one each time.
inflater = LayoutInflater.from((Context) context);
}
#Override
public View getView(int position, View convertView, ViewGroup parent)
{
// services to display
Services massage = (Services) this.getItem(position);
// The child views in each row.
CheckBox checkBox;
TextView textView;
// Create a new row view
if (convertView == null)
{
convertView = inflater.inflate(R.layout.customlist_massage,null );
// Find the child views.
textView = (TextView) convertView
.findViewById(R.id.massagetextview);
checkBox = (CheckBox) `enter code here`convertView.findViewById(R.id.checkBox4);
// Optimization: Tag the row with it's child views, so we don't
// have to
// call findViewById() later when we reuse the row.
convertView.setTag(new ViewHolder(textView, checkBox));
// If CheckBox is toggled, update the planet it is tagged with.
checkBox.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
CheckBox cb = (CheckBox) v;
Services massage = (Services) cb.getTag();
massage.setChecked(cb.isChecked());
}
});
}
// Reuse existing row view
else
{
// Because we use a ViewHolder, we avoid having to call
// findViewById().
ViewHolder viewHolder = (ViewHolder) convertView
.getTag();
checkBox = viewHolder.getCheckBox();
textView = viewHolder.getTextView();
}
// Tag the CheckBox with the service it is displaying,
// access the planet in onClick() when the CheckBox is toggled.
checkBox.setTag(massage);
// Display planet data
checkBox.setChecked(massage.isChecked());
textView.setText(massage.getName());
return convertView;
}
}
}
My Service class used to store services
public class Services
{
private String name = "";
private boolean checked = false;
private String categotry_id="";
public Services()
{
}
public Services(String name)
{
this.name = name;
}
public Services(String name, boolean checked,String categotry_id)
{
this.name = name;
this.categotry_id = categotry_id;
this.checked = checked;
}
public Services(String name,String categotry_id)
{
this.name = name;
this.categotry_id = categotry_id;
}
public String getCategory_id(String id)
{
return categotry_id;
}
public void setcategotry_id(String categotry_id)
{
this.name = categotry_id;
}
public String getName()
{
return name;
}
public void setName(String name)
{
this.name = name;
}
public boolean isChecked()
{
return checked;
}
public void setChecked(boolean checked)
{
this.checked = checked;
}
public String toString()
{
return name;
}
public void toggleChecked()
{
checked = !checked;
}
}
View holder class for storing views
public class ViewHolder
{
private CheckBox checkBox;
private TextView textView;
public ViewHolder()
{
}
public ViewHolder(TextView textView, CheckBox checkBox)
{
this.checkBox = checkBox;
this.textView = textView;
}
public CheckBox getCheckBox()
{
return checkBox;
}
public void setCheckBox(CheckBox checkBox)
{
this.checkBox = checkBox;
}
public TextView getTextView()
{
return textView;
}
public void setTextView(TextView textView)
{
this.textView = textView;
}
}
my xml class where list view is there
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#3F51B5">
<ListView
android:id="#+id/listView4"
android:layout_width="match_parent"
android:layout_height="0px"
android:background="#fff"
android:layout_weight="1" >
</ListView>
<Button
android:id="#+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginLeft="313dp"
android:text="Continue" />
</LinearLayout>
Please help me through this I need to submit this by tomorrow.

Use this
convertView = inflater.inflate(R.layout.customlist_massage,null ,false );
Instead this
convertView = inflater.inflate(R.layout.customlist_massage,null );

Why you are extending the adapter class ArrayAdapter.
If You want to show something on listview you have to extend it to BaseAdapter OR Recyclerview Adapter.
You dont have any getCount() method in ArrayAdapter see this example::
public class Adapter extends BaseAdapter {
LayoutInflater li;
ArrayList<String> title, details;
Context con;
DataBaseHelper db;
TextView txttitle, txtdetails, txtDate;
Intent in;
public static int i = 1;
View view;
public Adapter (Context cont, ArrayList<String> news_id, ArrayList<String> news) {
this.title = news_id;
this.details = news;
this.con = cont;
li = (LayoutInflater) con.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public int getCount() {
System.out.println("title.size() " + title.size());
return title.size();
}
#Override
public Object getItem(int arg0) {
return arg0;
}
#Override
public long getItemId(int arg0) {
return arg0;
}
#Override
public View getView(int arg0, View arg1, ViewGroup arg2) {
if (arg1 == null) {
arg1 = li.inflate(R.layout.adapter_daycare, null);
txttitle = (TextView) arg1.findViewById(R.id.title);
txtdetails = (TextView) arg1.findViewById(R.id.details);
txtDate = (TextView) arg1.findViewById(R.id.txtdate);
view = (View) arg1.findViewById(R.id.view);
}
String date = new SimpleDateFormat("dd/MM/yyyy").format(new Date());
System.out.println(" formattedDate " + date);
txttitle.setText(title.get(arg0).toString());
txtdetails.setText(details.get(arg0).toString());
txtDate.setText(date);
return arg1;
}
}

Issues with Filtering listview with edittext

Hello I'm working on an app which has an edittext to search for items on the listview. If the user types a letter in the edittext the listview is getting filtered perfectlty.Have used Adapter also.Now i have following issues:
1)when i m clearing letters edittext my listview is not getting Updated..
2) if i enter wrong letter or letter which does not corrorsponds to any item of a listview the listview is getting clear.
Have gone thorugh exmaples in SO
Android filter listview custom adapter
And googled also for same problem but not getting solved it..Plz anybody help me..
Here is my code:
package com.AAAAA.AAAAA;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Locale;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.Dialog;
import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v4.widget.SwipeRefreshLayout.OnRefreshListener;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.AdapterView.OnItemClickListener;
import com.AAAAA.adapter.UpdateSingleItemViewActivity;
import com.AAAAA.adapter.UpdatesAdapterList;
import com.AAAAA.local.database.DBController;
import com.AAAAA.AAAAA.AAAAA.constant.Constant;
import com.AAAAA.AAAAA.AAAAA.utils.Utility;
public class Cardiology_updates extends Activity implements OnClickListener,
OnRefreshListener {
EditText et ;
private Context appContext;
// ProgressDialog mProgressDialog;
private Dialog dialog;
private boolean isFinish = false;
String result = "";
JSONObject jsonobject;
JSONArray jsonArray;
ArrayList<HashMap<String, String>> UpdatesHmList;
public static ArrayList<HashMap<String, String>> FinalLocalDataList;
ArrayList<HashMap<String, String>> LocalDataList;
DBController controller = new DBController(this);
HashMap<String, String> queryValues;
ListView list;
UpdatesAdapterList adapter;
public static String UpdateID = "UpdateID";
public static String UpdateTitle = "Title";
/*
* public static String UpdateDescription = "Description"; public static
* String POPULATION = "UpdateDate"; public static String UpdateImage =
* "Photo";
*/
public static String UpdateDescription = "Description";
public static String POPULATION = "Title";
public static String UpdateImage = "Complete_imagePath";
public static String Complete_imagePath;
public static String Title;
public static String Description;
SwipeRefreshLayout swipeLayout;
private ProgressBar progressbar;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cardiology_updates);
// controller.deleteAllJsonData();
appContext = this;
animationView();
initComponent();
}
private void animationView() {
// TODO Auto-generated method stub
progressbar = (ProgressBar) findViewById(R.id.loading);
}
private void initComponent() {
// TODO Auto-generated method stub
swipeLayout = (SwipeRefreshLayout) findViewById(R.id.swipe_container);
swipeLayout.setOnRefreshListener(this);
swipeLayout.setColorScheme(android.R.color.holo_blue_bright,
android.R.color.holo_green_light,
android.R.color.holo_orange_light,
android.R.color.holo_red_light);
dialog = new Dialog(appContext);
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.alert_dialog);
((Button) findViewById(R.id.Button01)).setOnClickListener(this);
((Button) dialog.findViewById(R.id.btnOk)).setOnClickListener(this);
new GetUpdatesInfo().execute();
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (v.getId() == R.id.Button01) {
finish();
// finishActivity() ;
} else if (v.getId() == R.id.btnOk) {
dialog.dismiss();
if (isFinish) {
this.finish();
}
}
}
public class GetUpdatesInfo extends AsyncTask<String, Void, String> {
protected void onPreExecute() {
super.onPreExecute();
if (progressbar.getVisibility() != View.VISIBLE) {
progressbar.setVisibility(View.VISIBLE);
}
}
#Override
protected String doInBackground(String... params) {
// Create an array
UpdatesHmList = new ArrayList<HashMap<String, String>>();
// Retrieve JSON Objects from the given URL address
String url = null;
url = Constant.serverUrl + "/GetUpdateList";
result = Utility.postParamsAndfindJSON(url);
Log.e("result doInBackground", "" + result);
if (!(result == null)) {
try {
controller.deleteAllJsonData();
// Locate the array name in JSON
jsonArray = new JSONArray(result);
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("UpdateID", jsonobject.getString("UpdateID"));
map.put("Title", jsonobject.getString("Title"));
String Upadates_Photo = jsonobject.optString("Photo")
.toString();
String Complete_imagePath = Constant.prifixserverUrl
+ Upadates_Photo;
String Title = jsonobject.getString("Title").toString();
String Description = jsonobject
.getString("Description").toString();
String noHtml = Description.replaceAll("<[^>]*>", "");
String parseResponse = noHtml.replaceAll(" ", "");
map.put("Photo", Complete_imagePath);
map.put("Description", Description);
map.put("UpdateDate",
jsonobject.getString("UpdateDate"));
Log.e("UpdateID ",
" "
+ jsonobject.getString("UpdateID")
.toString());
Log.e("Title ", " "
+ jsonobject.getString("Title").toString());
Log.e("Complete_imagePath ",
" " + Complete_imagePath.toString());
Log.e("Description ", " " + parseResponse);
Log.e("UpdateDate ",
" "
+ jsonobject.getString("UpdateDate")
.toString());
queryValues = new HashMap<String, String>();
queryValues.put("Complete_imagePath",
Complete_imagePath);
queryValues.put("Title", Title);
queryValues.put("Description", Description);
controller.insertAllJsonData(queryValues);
// Set the JSON Objects into the array
UpdatesHmList.add(map);
}
} catch (JSONException e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
}
return result;
}
#Override
protected void onPostExecute(String result) {
// Locate the listview in listview_main.xml
if (progressbar.getVisibility() == View.VISIBLE) {
progressbar.setVisibility(View.GONE);
}
/*
* if (result == null) { //mProgressDialog.dismiss();
* localalldata();
*
* }
*/
localalldata();
/*
* list = (ListView) findViewById(R.id.list_Upadates); // Pass the
* results into ListViewAdapter.java adapter = new
* UpdatesAdapterList(Cardiology_updates.this, FinalLocalDataList);
* // Set the adapter to the ListView list.setAdapter(adapter);
*/
// Close the progressdialog
// mProgressDialog.dismiss();
}
}
#Override
public void onRefresh() {
// TODO Auto-generated method stub
// TODO Auto-generated method stub
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
getSomeData();
// localalldata();
swipeLayout.setRefreshing(false);
}
}, 5000);
}
protected void getSomeData() {
// TODO Auto-generated method stub
// localalldata();
new GetUpdatesInfo().execute();
adapter.notifyDataSetChanged();
/*
* if (LocalDataList == null) { Log.e("LocalDataList inside if ",
* "LocalDataList inside if "); new GetUpdatesInfo().execute();
*
* } else { // adapter.imageLoader.clearCache();
* Log.e("LocalDataList else ", "LocalDataList else ");
*
* adapter.notifyDataSetChanged(); }
*/
}
private void localalldata() {
// TODO Auto-generated method stub
LocalDataList = controller.getAllJsonData();
FinalLocalDataList = new ArrayList<HashMap<String, String>>();
for (HashMap<String, String> hashMap : LocalDataList) {
System.out.println(hashMap.keySet());
HashMap<String, String> map = new HashMap<String, String>();
for (String key : hashMap.keySet()) {
System.out.println(hashMap.get(key));
Complete_imagePath = hashMap.get("Complete_imagePath");
Title = hashMap.get("Title");
Description = hashMap.get("Description");
map.put("Complete_imagePath", Complete_imagePath);
map.put("Title", Title);
map.put("Description", Description);
Log.v("All Json CodiateUpdate Title", "" + Complete_imagePath);
Log.v("All Json CodiateUpdate Title", "" + Title);
}
FinalLocalDataList.add(map);
}
list = (ListView) findViewById(R.id.list_Upadates);
// Pass the results into ListViewAdapter.java
adapter = new UpdatesAdapterList(Cardiology_updates.this,
FinalLocalDataList);
// Set the adapter to the ListView
list.setTextFilterEnabled(true);
list.setAdapter(adapter);
// adapter.notifyDataSetChanged();
et = (EditText) findViewById(R.id.search);
// Capture Text in EditText
et.addTextChangedListener(new TextWatcher() {
#Override
public void afterTextChanged(Editable arg0) {
adapter.filter(arg0.toString());
}
#Override
public void beforeTextChanged(CharSequence arg0, int arg1,
int arg2, int arg3) {
// TODO Auto-generated method stub
}
#Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) {
//String text = et.getText().toString().toLowerCase(Locale.getDefault());
//adapter.getFilter().filter(arg0);
}
});
}
}
Here is my Adapter:
package com.AAAA.adapter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Locale;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.ImageView;
import android.widget.TextView;
import com.AAAA.AAAA.Cardiology_updates;
import com.AAAA.AAAA.R;
import com.AAAA.imageloader.ImageLoader;
public class UpdatesAdapterList extends BaseAdapter {
// Declare Variables
Context context;
LayoutInflater inflater;
ArrayList<HashMap<String, String>> data;
public ImageLoader imageLoader;
private Activity activity;
//HashMap<String, String> resultp = new HashMap<String, String>();
private ArrayList<HashMap<String,String>> filterData;
public UpdatesAdapterList(Context context,
ArrayList<HashMap<String, String>> arraylist) {
this.context = context;
data = arraylist;
imageLoader = new ImageLoader(context.getApplicationContext());
filterData = new ArrayList<HashMap<String,String>>();
filterData.addAll(this.data);
}
#Override
public int getCount() {
return filterData.size();
}
#Override
public Object getItem(int position) {
return filterData.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = LayoutInflater.from(context).inflate(R.layout.listview_updateitem, null);
holder.UpdateTitle = (TextView) convertView.findViewById(R.id.txtUpdatetitle);
holder.UpdateImage = (ImageView) convertView.findViewById(R.id.list_UpdateImage);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
holder.UpdateTitle.setText(filterData.get(position).get(Cardiology_updates.UpdateTitle));
imageLoader.DisplayImage(filterData.get(position).get(Cardiology_updates.UpdateImage), holder.UpdateImage);
// Capture ListView item click
convertView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
// Get the position
//resultp = data.get(position);
Intent intent = new Intent(context, UpdateSingleItemViewActivity.class);
// Pass all data rank
intent.putExtra("UpdateTile", filterData.get(position).get(Cardiology_updates.UpdateTitle));
// Pass all data country
intent.putExtra("UpdateDescription", filterData.get(position).get(Cardiology_updates.UpdateDescription));
// Pass all data population
intent.putExtra("population",filterData.get(position).get(Cardiology_updates.POPULATION));
// Pass all data flag
intent.putExtra("UpdateImage", filterData.get(position).get(Cardiology_updates.UpdateImage));
// Start SingleItemView Class
intent.putExtra("position", position);
context.startActivity(intent);
}
}); return convertView;
}
class ViewHolder{
TextView UpdateTitle;
ImageView UpdateImage;
}
public void filter(String constraint) {
filterData.clear();
if (constraint.length() == 0) {
filterData.addAll(data);
}else{
for (HashMap<String,String> row: data) {
if(row.get(Cardiology_updates.UpdateTitle).toUpperCase().startsWith(constraint.toString().toUpperCase())){
filterData.add(row);
}
}
}
notifyDataSetChanged();
}
}
Activity opens on cliking listview items:
package com.AAAAA.adapter;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import com.AAAAA.AAAAA.Cardiology_updates;
import com.AAAAA.AAAAA.R;
public class UpdateSingleItemViewActivity extends Activity {
int position;
String UpdateTile;
String UpdateDescription;
String population;
String UpdateImage;
//String position;
ViewPager viewPager;
PagerAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_update_single_item_view);
Log.e("UpdateSingleItemViewActivity class",
"UpdateSingleItemViewActivity class");
/*
* WebView webview = new WebView(this); setContentView(webview);
*/
Button btnback = (Button) findViewById(R.id.Button01);
btnback.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
finish();
}
});
//WebView webview = (WebView) findViewById(R.id.webview);
Intent i = getIntent();
// Get the result of rank
UpdateTile = i.getStringExtra("UpdateTile");
// Get the result of country
UpdateDescription = i.getStringExtra("UpdateDescription");
// Get the result of population
population = i.getStringExtra("population");
// Get the result of flag
UpdateImage = i.getStringExtra("UpdateImage");
//i.putExtra("POSITION_KEY", position);
position = i.getExtras().getInt("position");
//webview.loadData(UpdateDescription, "text/html", null);
viewPager = (ViewPager) findViewById(R.id.viewpager_layout);
// Pass results to ViewPagerAdapter Class
adapter = new ViewPagerAdapter(UpdateSingleItemViewActivity.this, Cardiology_updates.FinalLocalDataList);
// Binds the Adapter to the ViewPager
viewPager.setAdapter(adapter);
viewPager.setCurrentItem(position);
}
}
its Corrosponding adapter:
package com.AAAAA.adapter;
import java.util.ArrayList;
import java.util.HashMap;
import com.AAAAA.AAAAA.Cardiology_updates;
import com.AAAAA.AAAAA.R;
import com.AAAAA.imageloader.ImageLoader;
import android.app.Activity;
import android.content.Context;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebView;
import android.widget.LinearLayout;
public class ViewPagerAdapter extends PagerAdapter {
String UpdateTile;
String UpdateDescription;
//String population;
String UpdateImage;
String position;
LayoutInflater inflater;
Context context;
ArrayList<HashMap<String, String>> data;
public ImageLoader imageLoader;
private Activity activity;
//HashMap<String, String> resultp = new HashMap<String, String>();
ArrayList<HashMap<String,String>> filterData;
public ViewPagerAdapter(Context context, ArrayList<HashMap<String, String>> arraylist) {
this.context = context;
data = arraylist;
filterData = new ArrayList<HashMap<String,String>>();
filterData.addAll(this.data);
}
#Override
public int getCount() {
return filterData.size();
}
public Object getItem(int position) {
return filterData.get(position);
}
public long getItemId(int position) {
return position;
}
#Override
public boolean isViewFromObject(View view, Object object) {
return view == ((LinearLayout) object);
}
#Override
public Object instantiateItem(ViewGroup container, int position) {
WebView webview;
inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View itemView = inflater.inflate(R.layout.viewpager_item, container,
false);
//resultp =data.get(position);
webview=(WebView)itemView.findViewById(R.id.webview1);
//webview.setText(webview[position]);
webview.loadData(filterData.get(position).get(Cardiology_updates.UpdateDescription), "text/html", null);
((ViewPager) container).addView(itemView);
return itemView;
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
// Remove viewpager_item.xml from ViewPager
((ViewPager) container).removeView((LinearLayout) object);
}
}

When used custom adapter always try to implement ViewHolder design pattern for ListView performance and use custom filter function instead Filterable implementation :
Custom filter funcation required two array list one is filterable data list and another one is for orignal data list :
public void filter(String constraint) {
filterData.clear();
if (constraint.length() == 0) {
filterData.addAll(orignalData);
}else{
for (HashMap<String,String> row: orignalData) {
if(row.get(Cardiology_updates.UpdateTitle).toUpperCase().startsWith(constraint.toString().toUpperCase())){
filterData.add(row);
}
}
}
notifyDataSetChanged();
}
Example :
et.addTextChangedListener(new TextWatcher() {
#Override
public void afterTextChanged(Editable arg0) {
adapter.filter(arg0.toString());
}
#Override
public void beforeTextChanged(CharSequence arg0, int arg1,int arg2, int arg3) {
}
#Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2,int arg3) {
}
});
public class UpdatesAdapterList extends BaseAdapter {
private Context context;
private ArrayList<HashMap<String,String>> filterData;
private ArrayList<HashMap<String,String>> orignalData;
public ImageLoader imageLoader;
public UpdatesAdapterList(Context context,ArrayList<HashMap<String, String>> orignalData) {
this.context = context;
this.orignalData = orignalData;
filterData = new ArrayList<HashMap<String,String>>();
filterData.addAll(this.orignalData);
imageLoader = new ImageLoader(this.context);
}
#Override
public int getCount() {
return filterData.size();
}
#Override
public Object getItem(int position) {
return filterData.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = LayoutInflater.from(context).inflate(R.layout.listview_updateitem, null);
holder.UpdateTitle = (TextView) convertView.findViewById(R.id.txtUpdatetitle);
holder.UpdateImage = (ImageView) convertView.findViewById(R.id.list_UpdateImage);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
holder.UpdateTitle.setText(filterData.get(position).get(Cardiology_updates.UpdateTitle));
imageLoader.DisplayImage(filterData.get(position).get(Cardiology_updates.UpdateImage), holder.UpdateImage);
// Capture ListView item click
convertView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
Intent intent = new Intent(context, UpdateSingleItemViewActivity.class);
// Pass all data rank
intent.putExtra("UpdateTile", filterData.get(position).get(Cardiology_updates.UpdateTitle));
// Pass all data country
intent.putExtra("UpdateDescription", filterData.get(position).get(Cardiology_updates.UpdateDescription));
// Pass all data population
intent.putExtra("population",filterData.get(position).get(Cardiology_updates.POPULATION));
// Pass all data flag
intent.putExtra("UpdateImage", filterData.get(position).get(Cardiology_updates.UpdateImage));
// Start SingleItemView Class
intent.putExtra("position", position);
context.startActivity(intent);
}
});
return convertView;
}
class ViewHolder{
TextView UpdateTitle;
ImageView UpdateImage;
}
public void filter(String constraint) {
filterData.clear();
if (constraint.length() == 0) {
filterData.addAll(orignalData);
}else{
for (HashMap<String,String> row: orignalData) {
if(row.get(Cardiology_updates.UpdateTitle).toUpperCase().startsWith(constraint.toString().toUpperCase())){
filterData.add(row);
}
}
}
notifyDataSetChanged();
}
}

Android: Display image in imageview by SimpleAdapter

I am new android now I want to display image from an url. I am using imageview in listview. I want to add the list of images into the each row of the list item. I used SimpleAdapter but the imageview shows blank.
Here's the main activity:
package com.example.mysqltest;
import java.util.ArrayList;
import java.util.HashMap;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
public class ReadComments extends ListActivity {
// Progress Dialog
private ProgressDialog pDialog;
// testing on Emulator:
private static final String READ_COMMENTS_URL = "http://192.168.30.198/test/webservice/comments.php";
// JSON IDS:
private static final String TAG_SUCCESS = "success";
private static final String TAG_TITLE = "title";
private static final String TAG_POSTS = "posts";
private static final String TAG_POST_ID = "post_id";
private static final String TAG_USERNAME = "username";
private static final String TAG_MESSAGE = "message";
private static final String TAG_IMAGE = "image";
// An array of all of our comments
private JSONArray mComments = null;
// manages all of our comments in a list.
private ArrayList<HashMap<String, String>> mCommentList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// note that use read_comments.xml instead of our single_post.xml
setContentView(R.layout.read_comments);
}
#Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
// loading the comments via AsyncTask
new LoadComments().execute();
}
public void addComment(View v) {
Intent i = new Intent(ReadComments.this, AddComment.class);
startActivity(i);
}
/**
* Retrieves recent post data from the server.
*/
public void updateJSONdata() {
mCommentList = new ArrayList<HashMap<String, String>>();
JSONParser jParser = new JSONParser();
JSONObject json = jParser.getJSONFromUrl(READ_COMMENTS_URL);
try {
mComments = json.getJSONArray(TAG_POSTS);
for (int i = 0; i < mComments.length(); i++) {
JSONObject c = mComments.getJSONObject(i);
// gets the content of each tag
String title = c.getString(TAG_TITLE);
String content = c.getString(TAG_MESSAGE);
String username = c.getString(TAG_USERNAME);
String image = c.getString(TAG_IMAGE);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_TITLE, title);
map.put(TAG_MESSAGE, content);
map.put(TAG_USERNAME, username);
map.put(TAG_IMAGE, image);
// adding HashList to ArrayList
mCommentList.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
/**
* Inserts the parsed data into the listview.
*/
private void updateList() {
ListAdapter adapter = new SimpleAdapter(this, mCommentList,
R.layout.single_post, new String[] { TAG_TITLE, TAG_MESSAGE,
TAG_USERNAME,TAG_IMAGE }, new int[] { R.id.title, R.id.message,
R.id.username, R.id.imageView1 });
// I shouldn't have to comment on this one:
setListAdapter(adapter);
ListView lv = getListView();
lv.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {}
});
}
public class LoadComments extends AsyncTask<Void, Void, Boolean> {
#Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(ReadComments.this);
pDialog.setMessage("Loading Comments...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
#Override
protected Boolean doInBackground(Void... arg0) {
updateJSONdata();
return null;
}
#Override
protected void onPostExecute(Boolean result) {
super.onPostExecute(result);
pDialog.dismiss();
updateList();
}
}
}

Okay. So I assume here that you insist on using SimpleAdapter. No probem, problem solved, just follow the steps:
First lets create our custom row.xml for our ListView which will consist of only one ImageView.(You can add whatever you like to it later on but now i'll assume that you only wanna load the ImageView)
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="5dp"
android:layout_marginTop="5dp"
android:src="#drawable/ic_launcher" />
</RelativeLayout>
Second lets create our custom SimpleAdapter
package com.example.helpstack;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.SimpleAdapter;
public class MySimpleAdapter extends SimpleAdapter {
private Context mContext;
public LayoutInflater inflater = null;
public MySimpleAdapter(Context context,
List<? extends Map<String, ?>> data, int resource, String[] from,
int[] to) {
super(context, data, resource, from, to);
mContext = context;
inflater = (LayoutInflater) mContext
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View vi = convertView;
if (convertView == null)
vi = inflater.inflate(R.layout.row, null);
HashMap<String, Object> data = (HashMap<String, Object>) getItem(position);
new DownloadTask((ImageView) vi.findViewById(R.id.imageView1))
.execute((String) data.get("uri"));
return vi;
}
}
Third lets create our DownloadTask, this class will download the image:
package com.example.helpstack;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.widget.ImageView;
public class DownloadTask extends AsyncTask<String, Void, Boolean> {
ImageView v;
String url;
Bitmap bm;
public DownloadTask(ImageView v) {
this.v = v;
}
#Override
protected Boolean doInBackground(String... params) {
url = params[0];
bm = loadBitmap(url);
return true;
}
#Override
protected void onPostExecute(Boolean result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
v.setImageBitmap(bm);
}
public static Bitmap loadBitmap(String url) {
try {
URL newurl = new URL(url);
Bitmap b = BitmapFactory.decodeStream(newurl.openConnection()
.getInputStream());
return b;
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
}
Now the DownloadTask is being used from inside the getView() in SimpleAdapter
Fourth lets run our amazing small project from our MainActivity.java
package com.example.helpstack;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;
public class MainActivity extends Activity {
ListView lv;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv = (ListView) findViewById(R.id.listView1);
List<Map<String, Object>> data = new ArrayList<Map<String, Object>>();
Map<String, Object> map = new HashMap<String, Object>();
map.put("uri",
"http://upload.wikimedia.org/wikipedia/commons/thumb/f/f9/Wiktionary_small.svg/350px-Wiktionary_small.svg.png");
//here u can add as many uri as u want
data.add(map);
MySimpleAdapter adapter = new MySimpleAdapter(MainActivity.this, data,
R.layout.row, new String[] {}, new int[] {});
lv.setAdapter(adapter);
}
}

You can use any image cache library. Example, Picasa, Universal Image Loader..
You can cache the images from the URL and then you can use the images in your app.
You can find the libraries in the following links
http://square.github.io/picasso/ and https://github.com/nostra13/Android-Universal-Image-Loader

You can use multiple thread to download and decode bitmap .please follow this website and try to learn how android Developer use thread pool executer to execute different image in thread.
http://developer.android.com/training/multiple-threads/create-threadpool.html

1) To set the image Uri to the ImageView you can use a ViewBinder
You have to implement the abstract class and override setViewValue
2) You can use Picasso to load the images in a background thread and cache them.
The setViewValue method would look like this:
boolean setViewValue (View view, Object data, String textRepresentation) {
if(view.getId() == R.id.imageView1) {
Picasso.with(view.getContext()).load(textRepresentation).into((ImageView) view);
return true;
}
return false;
}
You return true if you want to take care of the binding. You return false for the default behavior.
3) Set your adapter to use the ViewBinder by calling adapter.setViewBinder(ViewBinder);

for now, my suggestion for you is:
1. download the image from url
2. save it as drawable in the storage
3. set this drawable to the image src of imageview
(I didn't see you do this part of job from your code...)

This tutorial is the best example to parse image using json parsing and show it in a listview: http://www.androidbegin.com/tutorial/android-json-parse-images-and-texts-tutorial/
Some other:
http://imagelistviewdynamic.blogspot.in/2012/12/image-parsed-from-json-using-async-into.html
http://www.java2s.com/Open-Source/Android_Free_Code/JSON/Download_Free_code_Android_JSON_Parse_Images_and_Texts_Tutorial.htm

I suggest you use Universal Image Loader, it uses asynchronous image downloading, caching and displaying, there you can find examples how to implement it. After you do it you dont have to concern about the number of images, or its size.
If you download the project you will find this example that does all the work you want:
/**
* #author Sergey Tarasevich (nostra13[at]gmail[dot]com)
*/
public class ImageListActivity extends AbsListViewBaseActivity {
DisplayImageOptions options;
String[] imageUrls;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.ac_image_list);
// here you get a String array with images URL
Bundle bundle = getIntent().getExtras();
imageUrls = bundle.getStringArray(Extra.IMAGES);
options = new DisplayImageOptions.Builder()
.showImageOnLoading(R.drawable.ic_stub)
.showImageForEmptyUri(R.drawable.ic_empty)
.showImageOnFail(R.drawable.ic_error)
.cacheInMemory(true)
.cacheOnDisc(true)
.considerExifParams(true)
.displayer(new RoundedBitmapDisplayer(20))
.build();
listView = (ListView) findViewById(android.R.id.list);
((ListView) listView).setAdapter(new ItemAdapter());
listView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
startImagePagerActivity(position);
}
});
}
#Override
public void onBackPressed() {
AnimateFirstDisplayListener.displayedImages.clear();
super.onBackPressed();
}
// it gets the position of listView and opens that image in a new Activity
private void startImagePagerActivity(int position) {
Intent intent = new Intent(this, ImagePagerActivity.class);
intent.putExtra(Extra.IMAGES, imageUrls);
intent.putExtra(Extra.IMAGE_POSITION, position);
startActivity(intent);
}
class ItemAdapter extends BaseAdapter {
private ImageLoadingListener animateFirstListener = new AnimateFirstDisplayListener();
private class ViewHolder {
public TextView text;
public ImageView image;
}
#Override
public int getCount() {
return imageUrls.length;
}
#Override
public Object getItem(int position) {
return position;
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
View view = convertView;
final ViewHolder holder;
if (convertView == null) {
view = getLayoutInflater().inflate(R.layout.item_list_image, parent, false);
holder = new ViewHolder();
holder.text = (TextView) view.findViewById(R.id.text);
holder.image = (ImageView) view.findViewById(R.id.image);
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
holder.text.setText("Item " + (position + 1));
// here is the place where is loaded the image using Universal ImageLoader , imageUrls[position] is a list of images URL
imageLoader.displayImage(imageUrls[position], holder.image, options, animateFirstListener);
return view;
}
}
private static class AnimateFirstDisplayListener extends SimpleImageLoadingListener {
static final List<String> displayedImages = Collections.synchronizedList(new LinkedList<String>());
#Override
public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
if (loadedImage != null) {
ImageView imageView = (ImageView) view;
boolean firstDisplay = !displayedImages.contains(imageUri);
if (firstDisplay) {
FadeInBitmapDisplayer.animate(imageView, 500);
displayedImages.add(imageUri);
}
}
}
}
}

Slow Application performance

I have developed a Contacts application. It does everything that a normal contacts application should does. There is always a chance of improvement. I had noticed in Android Emulator that loading for contact images starts when user has settled, he has scrolled the contact list to the area where there are chances are good that he would get contact he is searching for. So, I tried to implement the same thing on my app copy. I have implemented it. Its running very very slow. As I presume, I believe that application is running the thread multiple time even if it has retrieved the image which leads to big lagging. I am aware of the ASync task but just out of curiosity and to check whether it can be done, I don't wish to implement it here. Here is the source code for MainActivity.
package com.example.contact;
import java.io.InputStream;
import java.util.ArrayList;
import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.provider.ContactsContract.Contacts;
import android.app.ListActivity;
import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.AbsListView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
public class MainActivity extends ListActivity {
ListView listview;
private boolean mPaused;
private MyAdapter mAdapter;
private View view;
private boolean running = false;
final private ArrayList<String> con_ids = new ArrayList<String>();
private Context context;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
listview = getListView();
context = this;
Cursor c = getContentResolver().query(ContactsContract.Contacts.CONTENT_URI,
null,
null,
null,
ContactsContract.Contacts.DISPLAY_NAME+" ASC");
if(c!=null)
{
for(c.moveToFirst();!c.isAfterLast();c.moveToNext()){
con_ids.add(c.getString(c.getColumnIndex(ContactsContract.Contacts._ID)));
}
}
mAdapter = new MyAdapter(this, android.R.layout.simple_list_item_1, con_ids);
listview.setAdapter(mAdapter);
listview.setOnScrollListener(makeScrollListener());
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
public void setEnabled(boolean enabled) {
mPaused = !enabled;
}
private AbsListView.OnScrollListener makeScrollListener() {
return new AbsListView.OnScrollListener() {
#Override
public void onScrollStateChanged(AbsListView absListView, int scrollState) {
setEnabled(scrollState != AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL);
running = false;
}
#Override
public void onScroll(AbsListView absListView, int i, int i1, int i2) {
String log = "";
Log.d(log, "Scroll First Item" + i);
Log.d(log, ""+ listview.getChildCount());
final int want = i;
running = true;
runOnUiThread(new Thread(new Runnable() {
int totalChild = listview.getChildCount();
int first = listview.getFirstVisiblePosition() - listview.getHeaderViewsCount();
int toRetrieve = want-first;
int id;
long con_id;
Bitmap thumbnail;
final ListView list = listview;
#Override
public void run() {
// TODO Auto-generated method stub
while(running)
{
if(!(toRetrieve<0||toRetrieve>=totalChild))
{
id = want+toRetrieve;
con_id = Long.valueOf(con_ids.get(id));
Uri ContactUri = ContentUris.withAppendedId(Contacts.CONTENT_URI, con_id);
InputStream stream = ContactsContract.Contacts.openContactPhotoInputStream(context.getContentResolver(), ContactUri);
thumbnail = BitmapFactory.decodeStream(stream);
if(thumbnail == null)
{
toRetrieve++;
continue;
}
else
{
View view = list.getChildAt(toRetrieve);
if(view == null)
{
toRetrieve++;
continue;
}
else
{
ImageView iamge = (ImageView) view.findViewById(R.id.contact_iamge);
iamge.setImageBitmap(thumbnail);
}
toRetrieve++;
}
}
else
{
running = false;
}
}
}
}));
}
};
}
}
Code for MyAdapter,
package com.example.contact;
import java.util.ArrayList;
import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.provider.ContactsContract;
import android.provider.ContactsContract.Contacts;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebView.FindListener;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
public class MyAdapter extends ArrayAdapter<String> {
private Context context;
private ListView listview;
private ArrayList<String> ids;
private LayoutInflater infl;
private String displayname;
private String maindetail;
private SimplifiedContact contact;
private Drawable drawable;
public MyAdapter(Context context, int ResourceId, ArrayList<String> list)
{
super(context, ResourceId, list);
this.context = context;
ids = list;
infl = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
drawable = context.getResources().getDrawable(R.drawable.person);
}
static class ViewHolder
{
public ImageView image;
public TextView display_name;
public TextView main_detail;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
contact = new SimplifiedContact(context, Long.valueOf(ids.get(position)));
if(row == null)
{
row = infl.inflate(R.layout.single_cell, parent, false);
ViewHolder viewHolder = new ViewHolder();
viewHolder.display_name =(TextView) row.findViewById(R.id.disp_name);
viewHolder.main_detail = (TextView) row.findViewById(R.id.main_detail);
viewHolder.image = (ImageView)row.findViewById(R.id.contact_iamge);
row.setTag(viewHolder);
}
ViewHolder holder = (ViewHolder) row.getTag();
holder.display_name.setText(contact.getDisplayName());
holder.main_detail.setText(contact.getMainDetail());
holder.image.setBackgroundDrawable(drawable);
return row;
}
}
I wish to know, how this lag can be reduced. Thanks in advance.

Why don't you try to take that Thread instance that you are making in runOnUiThread and put It in a field, initializing It in the onCreate. I think that you are creating several thread instaces with no use.
public class MainActivity extends ListActivity {
ListView listview;
private boolean mPaused;
private MyAdapter mAdapter;
private View view;
private boolean running = false;
final private ArrayList<String> con_ids = new ArrayList<String>();
private Context context;
Thread uiThread;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
listview = getListView();
context = this;
Cursor c = getContentResolver().query(ContactsContract.Contacts.CONTENT_URI,
null,
null,
null,
ContactsContract.Contacts.DISPLAY_NAME+" ASC");
if(c!=null)
{
for(c.moveToFirst();!c.isAfterLast();c.moveToNext()){
con_ids.add(c.getString(c.getColumnIndex(ContactsContract.Contacts._ID)));
}
}
uiThread = new Thread(new Runnable() {
int totalChild = listview.getChildCount();
int first = listview.getFirstVisiblePosition() - listview.getHeaderViewsCount();
int toRetrieve = want-first;
int id;
long con_id;
Bitmap thumbnail;
final ListView list = listview;
#Override
public void run() {
// TODO Auto-generated method stub
while(running)
{
if(!(toRetrieve<0||toRetrieve>=totalChild))
{
id = want+toRetrieve;
con_id = Long.valueOf(con_ids.get(id));
Uri ContactUri = ContentUris.withAppendedId(Contacts.CONTENT_URI, con_id);
InputStream stream = ContactsContract.Contacts.openContactPhotoInputStream(context.getContentResolver(), ContactUri);
thumbnail = BitmapFactory.decodeStream(stream);
if(thumbnail == null)
{
toRetrieve++;
continue;
}
else
{
View view = list.getChildAt(toRetrieve);
if(view == null)
{
toRetrieve++;
continue;
}
else
{
ImageView iamge = (ImageView) view.findViewById(R.id.contact_iamge);
iamge.setImageBitmap(thumbnail);
}
toRetrieve++;
}
}
else
{
running = false;
}
}
}
});
mAdapter = new MyAdapter(this, android.R.layout.simple_list_item_1, con_ids);
listview.setAdapter(mAdapter);
listview.setOnScrollListener(makeScrollListener());
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
public void setEnabled(boolean enabled) {
mPaused = !enabled;
}
private AbsListView.OnScrollListener makeScrollListener() {
return new AbsListView.OnScrollListener() {
#Override
public void onScrollStateChanged(AbsListView absListView, int scrollState) {
setEnabled(scrollState != AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL);
running = false;
}
#Override
public void onScroll(AbsListView absListView, int i, int i1, int i2) {
String log = "";
Log.d(log, "Scroll First Item" + i);
Log.d(log, ""+ listview.getChildCount());
final int want = i;
running = true;
runOnUiThread(uiThread);
}
};
}
}