Develop Reference

Android - Listview adapter with asynctask to load images

I'm trying to handle an image loading at the background.
Now, I've look at the next link - here
And I've got few things I don't understand -
1) I've made the next CursorAdapter for the listview items-
public class ChatCursorAdapter extends CursorAdapter implements OnClickListener {
public ChatCursorAdapter(Context context, Cursor c) {
super(context, c, 0);
}
#Override
public int getCount() {
return getCursor() == null ? 0 : super.getCount();
}
#Override
public int getViewTypeCount() {
return 2;
}
#Override
public int getItemViewType(int _position) {
Cursor cursor = (Cursor) getItem(_position);
return getItemViewType(cursor);
}
private int getItemViewType(Cursor cursor) {
String sender = cursor.getString(2);
SharedPreferences userPref = PreferenceManager
.getDefaultSharedPreferences(MainChat.this);
String saveUser = userPref.getString("user", "");
if (saveUser.equalsIgnoreCase(sender)){
return 0;
}else{
return 1;
}
}
#Override
public void bindView(View view, Context context, Cursor cursor) {
holder = (ViewHolder) view.getTag();
holder.mesg.setText(getSmiledText(MainChat.this,msg));
holder.mesg2.setText(getSmiledText(MainChat.this,msg2));
holder.myImage.setTag(picPath);
holder.myImage.setImageBitmap(setImageToImageView(picPath));
}
#Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
ViewHolder holder = new ViewHolder();
View itemLayout = null;
switch(getItemViewType(cursor)){
case 0:
itemLayout = getLayoutInflater().inflate(R.layout.msg_item1,parent, false);
break;
case 1:
itemLayout = getLayoutInflater().inflate(R.layout.msg_item13, parent,false);
break;
}
itemLayout.setTag(holder);
holder.mesg = (TextView) itemLayout.findViewById(R.id.text_start);
holder.mesg2 = (TextView) itemLayout.findViewById(R.id.text_end);
holder.myImage = (ImageView) itemLayout.findViewById(R.id.imageView_msgpic);
return itemLayout;
}
Now i wnat to use the info from the link.
But i don't understand - What i need to pass into the and what to AsyncTask leave at CursorAdapter?
Also the sample code uses -
.execute(holder);
Can't I call to the AsyncTask like this -
new AsyncTask().execute();
And how and where should i call the AsyncTask, I don't understand it?
Thanks for any kind of help

You could always use an external lib like Universal-Image-Loader or Picasso to achieve what you are trying to do =)

Take a look at AsyncTask. You must Override doInBackground method. You may define a constructor to supply view in which you want to put downloaded image.
public class ImageDownloader extends AsyncTask<String, Void, List<Bitmap>> {
private ImageView ivImageHolder;
private Context context;
public ImageDownloader(Context context, ImageView imageHolder) {
this.ivImageHolder = imageHolder;
this.context = context;
}
...
#Override
protected List<Bitmap> doInBackground(String... params) {
//This happens in background
List<Bitmap> bitmaps = new ArrayList<Bitmap>();
for (String url : params) {
Bitmap bitmap = DownloadImage(url);
bitmaps.add(bitmap);
}
return bitmaps;
}
....
private Bitmap DownloadImage(String URL) {
Bitmap bitmap = null;
InputStream in = null;
try {
in = OpenHttpConnection(URL);
bitmap = BitmapFactory.decodeStream(in);
in.close();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
return bitmap;
}
...
private InputStream OpenHttpConnection(String urlString) throws IOException {
InputStream in = null;
int response = -1;
URL url = new URL(urlString);
URLConnection conn = url.openConnection();
if (!(conn instanceof HttpURLConnection))
throw new IOException("Not an HTTP connection");
try {
HttpURLConnection httpConn = (HttpURLConnection) conn;
httpConn.setAllowUserInteraction(false);
httpConn.setInstanceFollowRedirects(true);
httpConn.setRequestMethod("GET");
httpConn.connect();
response = httpConn.getResponseCode();
if (response == HttpURLConnection.HTTP_OK) {
in = httpConn.getInputStream();
}
} catch (Exception ex) {
throw new IOException("Error connecting");
}
return in;
}
#Override
protected void onPostExecute(List<Bitmap> bitmaps) {
super.onPostExecute(bitmaps);
for (int i = 0; i < bitmaps.size(); i++) {
final Bitmap bitmap = bitmaps.get(i);
ivImageHolder.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
new ImageViewActivity(context, bitmap).show();
}
});
// iv.setImageBitmap(bitmap);
ivImageHolder.setImageBitmap(bitmap);
ivImageHolder.setVisibility(ImageView.VISIBLE);
}
}

if you write your asyntask method I can say how can you use it, If it need to string value
you can use like this:
new your_async(context).execute(url) ;
But in my advice : you should use lazyadapter to use bitmaps on listview because there is a mermory issue if you do not pay attention properties of images.
here is link : stackoverfow

ListView Loading Images with AsyncTask

I have been reading through a lot of answers of questions that are similar to mine, but still having problem fixing my issue. I have a project that is an RSS Reader that loads in images in the background with an AsyncTask class. The program works, except if the user scrolls quickly then the images sometimes do not load in my rows. They never load in the incorrect spot, it just seems like they are skipped if the user scrolls quickly. Also, on start-up, only 2 or 1 of the images in my listview load out of the 4 rows that the user can see.
I know the problem has something to do with the WeakReference object that I use, but I am not sure how to implement it in a better way...
This is my RssListAdapter, which contains my Async class as well.
public class RssListAdapter extends ArrayAdapter<JSONObject>
{
TextView textView;
ImageView imageView;
JSONObject jsonImageText;
ProgressDialog progressDialog;
Activity activity2;
View rowView;
public RssListAdapter(Activity activity, List<JSONObject> imageAndTexts)
{
super(activity, 0, imageAndTexts);
activity2 = activity;
}
#Override
public View getView(int position, View convertView, ViewGroup parent)
{
Activity activity = (Activity) getContext();
LayoutInflater inflater = activity.getLayoutInflater();
// Inflate the views from XML
View rowView = (View) inflater
.inflate(R.layout.image_text_layout, null);
jsonImageText = getItem(position);
// ////////////////////////////////////////////////////////////////////////////////////////////////////
// The next section we update at runtime the text - as provided by the
// JSON from our REST call
// //////////////////////////////////////////////////////////////////////////////////////////////////
textView = (TextView) rowView.findViewById(R.id.job_text);
imageView = (ImageView) rowView.findViewById(R.id.feed_image);
BitmapDownloaderTask task = new BitmapDownloaderTask();
Spanned text;
try
{
text = (Spanned) jsonImageText.get("text");
textView.setText(text);
}
catch (JSONException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
task.execute();
return rowView;
}
public class BitmapDownloaderTask extends AsyncTask<String, Void, Bitmap>
{
private String url;
private RssListAdapter adapter;
private WeakReference<ImageView> imageViewReference = null;
#Override
// Actual download method, run in the task thread
protected Bitmap doInBackground(String... params)
{
imageViewReference = new WeakReference<ImageView>(imageView);
Bitmap img = null;
try
{
if (jsonImageText.get("imageLink") != null)
{
System.out.println("XXXX Link found!");
String url = (String) jsonImageText.get("imageLink");
URL feedImage = new URL(url);
HttpURLConnection conn = (HttpURLConnection) feedImage
.openConnection();
InputStream is = conn.getInputStream();
img = BitmapFactory.decodeStream(is);
}
}
catch (MalformedURLException e)
{
// handle exception here - in case of invalid URL being parsed
// from the RSS feed item
}
catch (IOException e)
{
// handle exception here - maybe no access to web
}
catch (JSONException e)
{
// textView.setText("JSON Exception");
}
return img;
}
#Override
// Once the image is downloaded, associates it to the imageView
protected void onPostExecute(Bitmap bitmap)
{
if (isCancelled())
{
bitmap = null;
}
if (imageViewReference != null)
{
ImageView imageView = imageViewReference.get();
if (imageView != null)
{
imageView.setImageBitmap(bitmap);
}
}
}
#Override
// Before images are loaded
protected void onPreExecute()
{
if (imageViewReference == null)
{
imageView.setImageResource(R.drawable.stub);
}
}
}
}

You should check the official Android "Displaying Bitmaps Efficiently" tutorial on how to load and display bitmaps efficiently. It comes with a ready to use piece of code.

image display as gridview

i want to display images from mysql server(testing in localhost) using imageurl,i have images in a filder on my server,in an android client app as gridview along with text.how do i use imageurl in my code?
mymainmenu.java
public class MainMenu extends Activity {
GridView gridView;
static final String[] MOBILE_OS = new String[] {
"Android", "iOS","Windows", "Blackberry" };
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mainmenu_list);
gridView = (GridView) findViewById(R.id.gridView1);
gridView.setAdapter(new ImageAdapter(this, MOBILE_OS));
gridView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {
Toast.makeText(
getApplicationContext(),
((TextView) v.findViewById(R.id.grid_item_label))
.getText(), Toast.LENGTH_SHORT).show();
}
});
}
}
my imageadapter.java:
public class ImageAdapter extends BaseAdapter {
private Context context;
private final String[] mobileValues;
public ImageAdapter(Context context, String[] mobileValues) {
this.context = context;
this.mobileValues = mobileValues;
}
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View gridView;
if (convertView == null) {
gridView = new View(context);
// get layout from list.xml
gridView = inflater.inflate(R.layout.list, null);
// set value into textview
TextView textView = (TextView) gridView
.findViewById(R.id.grid_item_label);
textView.setText(mobileValues[position]);
// set image based on selected text
ImageView imageView = (ImageView) gridView
.findViewById(R.id.grid_item_image);
String mobile = mobileValues[position];
if (mobile.equals("Windows")) {
imageView.setImageResource(R.drawable.imggrid);
} else if (mobile.equals("iOS")) {
imageView.setImageResource(R.drawable.imggrid);
} else if (mobile.equals("Blackberry")) {
imageView.setImageResource(R.drawable.imggrid);
} else {
imageView.setImageResource(R.drawable.imggrid);
}
} else {
gridView = (View) convertView;
}
return gridView;
}
#Override
public int getCount() {
return mobileValues.length;
}
#Override
public Object getItem(int position) {
return null;
}
#Override
public long getItemId(int position) {
return 0;
}
}
I dnt know how to use the following in my code:
try {
URL url = new URL(imageFileURL);
URLConnection conn = url.openConnection();
HttpURLConnection httpConn = (HttpURLConnection)conn;
httpConn.setRequestMethod("GET");
httpConn.connect();
if (httpConn.getResponseCode() == HttpURLConnection.HTTP_OK) {
InputStream inputStream = httpConn.getInputStream();
Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
inputStream.close();
img.setImageBitmap(bitmap);
}
} catch (MalformedURLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

Put the image downloading code in a AsyncTask. Here is the explanation.
Execute one instance of asynctask in your getView method, i.e to fetch one image everytime.
private class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
ImageView mImageView;
public void setImageView(ImageView img) {
mImageView = img;
}
protected Bitmap doInBackground(String... urls) {
return loadImageFromNetwork(urls[0]);
}
protected void onPostExecute(Bitmap result) {
mImageView.setImageBitmap(result);
}
}
Call task.setImageView(yourImageViewinGrid) before executing your AsyncTask to let it know where to set the image after downloading.

To get the image, you have to do something like :
URL new_url = new URL("your url");
Bitmap image_bitmap = BitmapFactory.decodeStream(newurl.openConnection() .getInputStream()); ImageView image_view = new ImageView(this);
image_view.setImageBitmap(image_bitmap);
Anyway, it's better to download the image as background task. What I actually do is to create a custom view with one private inner class that extend AsyncTask to download the image for you.

I dnt know how to use the following in my code:
that code will download the image for you, you can place in separate thread either AsyncTask or Thread and set the downloaded image in the imageview... simple as that. There are so many example on the web you can google it out
EIDTED
code to download the image
public class AsyncFetchImage extends AsyncTask<String, Void, Bitmap>{
private WeakReference<ImageView> imageReference;
// private WeakReference<Dialog> dialogReferance;
public AsyncFetchImage(ImageView imageview) {
imageReference = new WeakReference<ImageView>(imageview);
// dialogReferance = new WeakReference<Dialog>(dialog);
}
#Override
protected Bitmap doInBackground(String... s) {
return downloadImage(s[0]);
}
private Bitmap downloadImage(String url) {
final AndroidHttpClient client = AndroidHttpClient.newInstance("Nixit");
final HttpGet getRequest = new HttpGet(url);
try {
HttpResponse response = client.execute(getRequest);
final int statusCode = response.getStatusLine().getStatusCode();
if(statusCode != HttpStatus.SC_OK){
Log.w("ImageDownloader", "Error " + statusCode + " while retrieving bitmap from " + url);
return null;
}
final HttpEntity entity = response.getEntity();
if(entity != null){
InputStream is = null;
try{
is = entity.getContent();
final Bitmap bit = BitmapFactory.decodeStream(is);
return bit;
}finally{
if(is != null)
is.close();
entity.consumeContent();
}
}
} catch (IOException e) {
e.printStackTrace();
return null;
} finally{
if(client != null){
client.close();
}
}
Log.i("Image Fetch","Image Fetch Complete");
return null;
}
#Override
protected void onPostExecute(Bitmap result) {
if(isCancelled()){
result = null;
}
if(imageReference != null){
ImageView imageView = imageReference.get();
// Dialog di = dialogReferance.get();
if (imageView != null) {
imageView.setImageBitmap(result);
// di.show();
}
}
}
}
How to use:-
imageView = (ImageView)dialog.findViewById(R.id.imageView1);
AsyncFetchImage fetchImage = new AsyncFetchImage(imageView);
fetchImage.execute(url);
You can use this in getview method of adapter
Hope that help

Android - GridView's onResume

I am developing Android apps,
once part of this apps is creating a GridView that contain some image (the image is loaded from URL),
then another activity that show the selected image in full screen will be appeared when one of image in GridView is onClick.
Problem:
When I enter the GridView activity, it takes some second to load all image in gridview normally.
Then I click one of image to enter the full screen activity and click back button to go back to GridView,
but, it takes some second to loading when go back to gridview, just like loading all image again.
I wonder why the gridview activity will loading for a few second when onResume?
For example, in Google Play, the full screen view of sample image in any apps can be back to previous view immediately.
Enclosed code:
GridView:
public class ManagePhoto extends Activity {
ImageAdapter ia;
GridView gridview;
InputStream inputStream;
private static final int SELECT_PICTURE = 1;
private String selectedImagePath;
TextView tvRunningMark;
boolean bRunning;
String[] purl;
Bitmap[] bm;
String the_string_response;
TouchImageView touch;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.photo_manage);
//gv is Gobal Value
final Gvalue gv = ((Gvalue) getApplicationContext());
gridview = (GridView) findViewById(R.id.gv_photo);
gridview.setOnItemClickListener(new GridView.OnItemClickListener() {
public void onItemClick(AdapterView adapterView, View view,int position, long id) {
gv.setbm(bm[position]);
Intent myIntent = new Intent(adapterView.getContext(), FullScreenImage.class);
startActivityForResult(myIntent, 0);
}
});
new GridTask().execute();
}
public class ImageAdapter extends BaseAdapter {
private Context mContext;
public ImageAdapter(Context c) {
mContext = c;
}
public int getCount() {
return purl.length;
}
public Object getItem(int position) {
return null;
}
public long getItemId(int position) {
return 0;
}
// create a new ImageView for each item referenced by the Adapter
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView;
if (convertView == null) { // if it's not recycled, initialize some
// attributes
imageView = new ImageView(mContext);
imageView.setLayoutParams(new GridView.LayoutParams(200,200));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(8, 8, 8, 8);
} else {
imageView = (ImageView) convertView;
}
try {
bm[position] = loadBitmap(purl[position]);
imageView.setImageBitmap(bm[position]);
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return imageView;
}
}
class GridTask extends AsyncTask<Void, String, Void> {
#Override
protected void onPostExecute(Void result) {
gridview.setAdapter(ia);
final LinearLayout llo_probar = (LinearLayout)findViewById(R.id.llo_probar);
llo_probar.setVisibility(LinearLayout.GONE);
gridview.setVisibility(GridView.VISIBLE);
}
#Override
protected void onPreExecute() {
}
#Override
protected void onProgressUpdate(String... values) {
}
#Override
protected Void doInBackground(Void... params) {
getphoto();
bm = new Bitmap[purl.length];
ia = new ImageAdapter(ManagePhoto.this);
return null;
}
}
private Bitmap loadBitmap(String url) throws MalformedURLException,IOException {
return BitmapFactory.decodeStream(new FlushedInputStream(
(InputStream) new URL(url).getContent()));
}
class FlushedInputStream extends FilterInputStream {
public FlushedInputStream(final InputStream inputStream) {
super(inputStream);
}
#Override
public long skip(final long n) throws IOException {
long totalBytesSkipped = 0L;
while (totalBytesSkipped < n) {
long bytesSkipped = in.skip(n - totalBytesSkipped);
if (bytesSkipped == 0L) {
int bytesRead = read();
if (bytesRead < 0) { // we reached EOF
break;
}
bytesSkipped = 1;
}
totalBytesSkipped += bytesSkipped;
}
return totalBytesSkipped;
}
}
public void getphoto(){
final Gvalue gv = ((Gvalue) getApplicationContext());
final TextView tv_fn = (TextView) findViewById(R.id.tv_fn);
String result = "";
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("sql",
("select * from personal_photo where member_id = " + gv.getuid())));
InputStream is = null;
// http post
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://" + gv.getserverIP()
+ "/android_getdata.php");
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
} catch (Exception e) {
Log.e("log_tag", "Error in http connection " + e.toString());
}
// convert response to string
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result = sb.toString();
} catch (Exception e) {
Log.e("log_tag", "Error converting result " + e.toString());
}
// parse json data
try {
List url = new ArrayList();
JSONArray jArray = new JSONArray(result);
for (int i = 0; i < jArray.length(); i++) {
JSONObject json_data = jArray.getJSONObject(i);
url.add(json_data.getString("save_location"));
}
int size = url.size();
purl = new String[size];
for (int j = 0; j < size; j++) {
purl[j] = (String) url.get(j);
}
} catch (JSONException e) {
Log.e("log_tag", "Error parsing data " + e.toString());
}
}
public void toast(String text) {
Toast.makeText(ManagePhoto.this, text, 5).show();
}
}
Full screen:
public class FullScreenImage extends Activity {
TouchImageView touch;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
requestWindowFeature(Window.FEATURE_NO_TITLE);
new ShowPhotoTask().execute();
}
class ShowPhotoTask extends AsyncTask<Void, String, Void> {
#Override
protected void onPostExecute(Void result) {
setContentView(touch);
}
#Override
protected void onPreExecute() {
setContentView(R.layout.full_image);
}
#Override
protected void onProgressUpdate(String... values) {
}
#Override
protected Void doInBackground(Void... params) {
final Gvalue gv = ((Gvalue) getApplicationContext());
touch = new TouchImageView(FullScreenImage.this);
touch.setMaxZoom(4f); // change the max level of zoom, default is 3f
touch.setImageBitmap(gv.getbm());
return null;
}
}
}

From your getView code in your ImageAdapter, everytime you will load the image from the internet again.
You should download the image to local, next time, when your set the image, you try to get it from local firstly.
As well you should put the get bitmap in the thread as you have putting the parse JSON in the thread.
Here is an demo, i think it will help you.

In your gridview onclick you are starting activity with startActivityForResults(intent,0); replace it with startActivity(intent);
also when you are finishing the FullScreenActivity just use finish();
might solve your problem

It's so slow because you don't perform your operations with background threads, caching..
A simple and better solution could be a collection that contains all your bitmaps inserted by AsyncTasks that you'll execute to download the pictures.
There are better solutions but they are more difficult to implement.
For example you can consider the possibility to keep a thread pool that resolves your runnables represented by "download the http://jhon.doe.jpg" and then "show now on the UI thread".

As you have written below function inside the getView() method:
bm[position] = loadBitmap(purl[position]);
I would say you should implement code to load Image Asynchronously. In this logic, image is synced in your memory card once its downloading is done. So next time it will load directly from memory card instead of loading it from web again.
Here is a code example you can give a try: Android - Universal Image Loader

Remote images repeats in listview

I am trying to parse remote images and text in listview. the code is shown below:
public class ParseImagesActivity extends ListActivity {
String myURL;
String xml;
Document doc;
NodeList nodes;
int equal=1;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
xml = XmlParser.getXML("http://www.myurl.com");
doc = XmlParser.XMLfromString(xml);
nodes = doc.getElementsByTagName("item");
for ( int i = 0; i < nodes.getLength(); i++) {
Element e = (Element)nodes.item(i);
myURL = XmlParser.getValue(e, "thumb");
startParsing(myURL);
}
}
private void startParsing(String url) {
new backgroundLoadListView().execute(url);
}
public class backgroundLoadListView extends
AsyncTask<String, String, String> {
#Override
protected void onPostExecute(String unused) {
// TODO Auto-generated method stub
setListAdapter(new MyCustomAdapter(ParseImagesActivity.this,
R.layout.row, month));
}
#Override
protected void onPreExecute() {
}
#Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
String url = params[0];
preLoadSrcBitmap(url);
return null;
}
}
public class MyCustomAdapter extends ArrayAdapter<String> {
Bitmap bm;
public MyCustomAdapter(Context context, int textViewResourceId,
String[] objects) {
super(context, textViewResourceId, objects);
// TODO Auto-generated constructor stub
bm = srcBitmap;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
if(row==null){
LayoutInflater inflater=getLayoutInflater();
row=inflater.inflate(R.layout.row, parent, false);
}
TextView label=(TextView)row.findViewById(R.id.weekofday);
label.setText(month[position]);
ImageView icon=(ImageView)row.findViewById(R.id.icon);
icon.setImageBitmap(bm);
return row;
}
}
Bitmap srcBitmap;
private void preLoadSrcBitmap(String url){
BitmapFactory.Options bmOptions;
bmOptions = new BitmapFactory.Options();
bmOptions.inSampleSize = 1;
srcBitmap = LoadImage(url, bmOptions);
}
String[] month = {
"January", "February", "March", "April",
"May", "June", "July", "August",
"September", "October", "November", "December"
};
#Override
protected void onListItemClick(ListView l, View v, int position, long id) {
// TODO Auto-generated method stub
//super.onListItemClick(l, v, position, id);
String selection = l.getItemAtPosition(position).toString();
Toast.makeText(this, selection, Toast.LENGTH_LONG).show();
}
private Bitmap LoadImage(String URL, BitmapFactory.Options options)
{
Bitmap bitmap = null;
InputStream in = null;
try {
in = OpenHttpConnection(URL);
bitmap = BitmapFactory.decodeStream(in, null, options);
in.close();
} catch (IOException e1) {
}
return bitmap;
}
private InputStream OpenHttpConnection(String strURL) throws IOException{
InputStream inputStream = null;
URL url = new URL(strURL);
URLConnection conn = url.openConnection();
try{
HttpURLConnection httpConn = (HttpURLConnection)conn;
httpConn.setRequestMethod("GET");
httpConn.connect();
if (httpConn.getResponseCode() == HttpURLConnection.HTTP_OK) {
inputStream = httpConn.getInputStream();
}
}
catch (Exception ex){
}
return inputStream;
}
I have also xmlparser class. There are different images to be parsed in listview. When i run app images repeats in listview means 1st image displays in all rows of listview than disappear than 2nd appears in all rows and disappear and continuesly images are displaying and disappearing and last image displays in all rows of listview and doesn't disappears.
I think i am doing some thing wrong in getView() method in MyCustomadapter class. I can't figure it out that how should solve that problem? I want 1st image in 1st row and 2nd in 2nd row etc. How to correct it? Anybody can help?
Thanks in advance.

It looks to be like you're creating a new AsyncTask (BackgroundLostListView) for every "item" in the XML. As each of these AsyncTasks finish, you are setting a new ListAdapter (MyCustomAdapter) for each one and having one Bitmap associated with that Adapter. You want to have one Adapter for the whole ListView that has a complete data set (for all the rows, including either the Bitmaps themselves or perhaps URLs to download them in the background).
Also note, your AsyncTask seems to only be using one of the three parameters, but you've set them all to Strings. For any parameter you aren't using, you should use "Void" instead.