In my application, to populating a ListView i am using custom adapter, because one listitem consists of 3 TextViews and 1 ImageView.
Everytime images are fetched from url.
So when i am launching this activity its taking much time,because its downloading all images then populating the lists.
So i want without images list should populate first having only Textviews and after that only images should come.
How can i do that?
By loading your images with an AsyncTask
example directly from documentation:
public void onClick(View v) {
new DownloadImageTask().execute("http://example.com/image.png");
}
private class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
/** The system calls this to perform work in a worker thread and
* delivers it the parameters given to AsyncTask.execute() */
protected Bitmap doInBackground(String... urls) {
return loadImageFromNetwork(urls[0]);
}
/** The system calls this to perform work in the UI thread and delivers
* the result from doInBackground() */
protected void onPostExecute(Bitmap result) {
mImageView.setImageBitmap(result);
}
}
you have to create a lazy image loader using async task.
by doing that, all your list view will be populated. and when the images are fetched, they are updated into the list views asynchronously.
Here is a link - http://iamvijayakumar.blogspot.com/2011/06/android-lazy-image-loader-example.html
You can use lazy load images like this:
https://github.com/thest1/LazyList
Lazy load of images in ListView
The basic Idea is to have a loading image already within your app.
Then use an asyncTask or a thread to load image.
Some code to start with :
Adapter
public class ImageAdapter extends BaseAdapter {
private static final String TAG = "Image Adapter";
int mGalleryItemBackground;
private Context mContext;
private GridView mView;
/** URL-Strings to some remote images. */
private String[] mRemoteImagesURL ;
private Bitmap[] loadedImages;
public ImageAdapter(Context c,String[] remoteImagesURL,GridView v) {
mContext = c;
TypedArray attr = mContext.obtainStyledAttributes(R.styleable.HelloGallery);
mGalleryItemBackground = attr.getResourceId(R.styleable.HelloGallery_android_galleryItemBackground, 0);
attr.recycle();
mView = v;
mRemoteImagesURL=remoteImagesURL;
loadedImages = new Bitmap[mRemoteImagesURL.length];
}
public int getCount() {
return mRemoteImagesURL.length;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) mContext
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.gallery_item, null);
}
ImageView imageView = (ImageView) convertView.findViewById(R.id.FrontImageView);
/* when image is already down-loaded then load that image */
if(loadedImages[position]!=null)
imageView.setImageBitmap(loadedImages[position]);
else
imageView.setImageResource(R.drawable.loading);
imageView.setBackgroundResource(mGalleryItemBackground);
return convertView;
}
public void loadImage(int position){
Bitmap bm;
try {
/* Open a new URL and get the InputStream to load data from it. */
URL aURL = new URL(mRemoteImagesURL[position]);
URLConnection conn = aURL.openConnection();
conn.connect();
InputStream is = conn.getInputStream();
/* Buffered is always good for a performance plus. */
BufferedInputStream bis = new BufferedInputStream(is);
/* Decode url-data to a bitmap. */
bm = BitmapFactory.decodeStream(bis);
bis.close();
is.close();
loadedImages[position] =bm;
} catch (Exception e) {
Log.e(TAG, "Remote Image Load Exception"+e);
}
}
public void setLoadedImage(int position)
{
Log.d(TAG, "Position "+position);
View childView= mView.getChildAt(position);
if(loadedImages[position]!=null && childView != null)
{
ImageView imageView= (ImageView) childView.findViewById(R.id.FrontImageView);
imageView.setImageBitmap(loadedImages[position]);
}
}
}
private void updateImagesAsThread() {
Thread t = new Thread()
{
public void run()
{
try {
for(int i=0;i<imageAdapter.getCount();i++)
{
imageAdapter.loadImage(i);
listAdapterHandler.sendEmptyMessage(i);
}
}
catch (Exception e) {
// TODO: handle exception
Log.e(TAG,"UpdateImageAsThread "+e);
}
}
};
t.start();
}
private Handler listAdapterHandler = new Handler()
{
#Override
public void handleMessage(Message msg)
{
switch (msg.what)
{
case -1:
Log.d(TAG, "here in the handle...");
break;
default:
Log.d(TAG, "here in the handle default...");
imageAdapter.setLoadedImage(msg.what);
//imageAdapter.notifyDataSetChanged();
break;
}
}
};
Related
This is my code:
public class GetAllCategoriesListViewAdapter extends BaseAdapter{
private JSONArray dataArray;
private Activity activity;
private static final String baseUrlForCategoryImage = "link here";
private static LayoutInflater inflater = null;
public GetAllCategoriesListViewAdapter(JSONArray jsonArray, Activity a){
this.dataArray = jsonArray;
this.activity = a;
inflater = (LayoutInflater) this.activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public int getCount() {
return this.dataArray.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) {
final ListCell cell;
if(convertView == null){
convertView = inflater.inflate(R.layout.get_all_categories_list_view_cell, null);
cell = new ListCell();
cell.category_name = (TextView) convertView.findViewById(R.id.category_name);
cell.category_image = (ImageView) convertView.findViewById(R.id.category_image);
cell.category_image.setTag(cell);
convertView.setTag(cell);
}else{
cell = (ListCell) convertView.getTag();
}
try{
JSONObject jsonObject = this.dataArray.getJSONObject(position);
cell.category_name.setText(jsonObject.getString("category_name"));
String nameOfImage = jsonObject.getString("category_image");
String urlForImageInServer = baseUrlForCategoryImage + nameOfImage;
new AsyncTask<String, Void, Bitmap>(){
protected Bitmap doInBackground(String... params){
String url = params[0];
Bitmap icon = null;
try{
InputStream in = new java.net.URL(url).openStream();
icon = BitmapFactory.decodeStream(in);
}catch (MalformedURLException e){
e.printStackTrace();
}catch (IOException e){
e.printStackTrace();
}
return icon;
}
#Override
protected void onPostExecute(Bitmap result) {
cell.category_image.setImageBitmap(result);
}
}.execute(urlForImageInServer);
}catch (JSONException e){
e.printStackTrace();
}
return convertView;
}
private class ListCell{
private ImageView category_image;
private TextView category_name;
}
}
The code gets the images from my webhost and place it in every cell in my listvew. The problem is everytime I scroll, the images are shuffled and returns in few seconds. How to stop the images from changing when I scroll? I tried to use the solution on other post but it won't work. Please help.
Looks like you are new to android. So you are fetching the images in the getView method. The getView method is called every time a new list item is drawn. So For every image, a new request is made to internet. SO that will be a lot of requests . You should firstly get your images and get them in some ArryayList . Then pass that Arraylist to your adapter. Here is tutorial for you
Using AsyncTask
http://www.devexchanges.info/2015/04/android-custom-listview-with-image-and.html
Using Volley
https://www.androidhive.info/2014/07/android-custom-listview-with-image-and-text-using-volley/
Go for Volley for better performance. Cheers!
I am getting a big response from the server with data and image url. I need to display them on the List View. Images should be like thumbnails. To make it proper i have customized my Adapter and getting the images using Async Task. Here is my Adapter and Asynctask Code:
public class TalkofTownAdapter extends BaseAdapter{
private LayoutInflater inflater = null;
private Context context = null;
ImageView thumb_image = null;
private ProgressDialog progressbar = null;
ArrayList<String> items;
ArrayList<String> thumb_url;
public TalkofTownAdapter(Context c, ArrayList<String> list, ArrayList<String> thumb)
{
this.context = c;
this.items = list;
this.thumb_url = thumb;
progressbar = new ProgressDialog(c);
Log.d("Testing", "talk of town adapter constructor "+items.size());
inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return items.size();
}
#Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
#Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = inflater.inflate(R.layout.talkoftown, null);
Log.d("Testing", "before creating holder object");
holder = new ViewHolder();
holder.headlineView = (TextView) convertView.findViewById(R.id.list_title);
holder.duration = (TextView)convertView.findViewById(R.id.duration);
holder.imageView = (ImageView) convertView.findViewById(R.id.list_image_playlist);
Log.d("Testing", "image view created :::::::: ");
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
Log.d("Testing", "text::: "+items.get(position));
holder.headlineView.setText(items.get(position));
Log.d("Testing", "settting the text ");
holder.duration.setText("22/09/1987");
if (holder.imageView != null) {
Log.d("Testing", "getting the image "+thumb_url.get(position));
new ImageDownloaderTask(holder.imageView).execute(thumb_url.get(position));
}
return convertView;
}
static class ViewHolder {
TextView headlineView;
TextView duration;
ImageView imageView;
}
public static Bitmap getBitmapFromURL(String src) {
try {
URL url = new URL(src);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream input = connection.getInputStream();
Bitmap myBitmap = BitmapFactory.decodeStream(input);
Log.d("Testing", "image loaded "+myBitmap);
// myBitmap = Bitmap.createBitmap(100, 50, Config.ARGB_8888);
myBitmap = Bitmap.createScaledBitmap(myBitmap,(int)(myBitmap.getWidth()), (int)(myBitmap.getHeight()), true);
return myBitmap;
} catch (IOException e) {
Log.d("Testing", "exception is getting the image "+e.toString());
e.printStackTrace();
return null;
}
}
public void startProgress()
{
progressbar.setMessage("Please wait");
progressbar.show();
}
public void stopProgress()
{
progressbar.dismiss();
}
class ImageDownloaderTask extends AsyncTask<String, Void, Bitmap> {
private final WeakReference<ImageView> imageViewReference;
public ImageDownloaderTask(ImageView imageView) {
imageViewReference = new WeakReference<ImageView>(imageView);
}
#Override
// Actual download method, run in the task thread
protected Bitmap doInBackground(String... params) {
// params comes from the execute() call: params[0] is the url.
return getBitmapFromURL(params[0]);
}
#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) {
if (bitmap != null) {
imageView.setImageBitmap(bitmap);
} else {
imageView.setImageDrawable(imageView.getContext().getResources()
.getDrawable(R.drawable.rihanna));
}
}
}
}
}
Now the thumbnails are showing with the default image and then changing with downloaded images. But if i am scrolling down the list view, images are keep on changing and coming duplicates of those that appeared in the rows above that were already scrolled up. So i mean to say here, the images are coming on proper order for the corresponding rows. I know there are lots of tutorials and QA here also. But i have tried lots of solutions and it did not work properly.
Can any one help me on this?
The problem is with you if condition. Just remove the if condition if (holder.imageView != null) { the problem is each and everytime getView will check for your view is null or not and based on that it will execute and inflate the image.
Change your if condition like
if(thumb_url.get(position) !=null)
{
Log.d("Testing", "getting the image "+thumb_url.get(position));
new ImageDownloaderTask(holder.imageView).execute(thumb_url.get(position));
}
I have an application which allow to download 3 images and show them into a gallery
In order to do this , i use a thread in order to download the images and a handler in order to put the images into the gallery
The problem is that the images are not displayed(imageviews are empty) into the gallery (even if i see 3 imageview for my 3 images)
I do not know if this is because the connection is very slow (I develop on a mobile) or if it's because the ui is displayed before images are downloaded
Thank you very much for your help
public class ChoiceLanguage extends Activity {
private TextView nomLangue;
private ArrayList<Language> listeLangues;
private ArrayList<String> listImages;
private Gallery gallery;
private String URL="******************";
private Drawable mNoImage;
Bitmap bitmap;
ImageView imgView = null;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.choice_language);
listeLangues= getIntent().getParcelableArrayListExtra("listeLangues");
listImages=buildListImages();
gallery = (Gallery) findViewById(R.id.galleryImg);
gallery.setAdapter(new AddImgAdp(this));
gallery.setSpacing(10);
gallery.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView parent, View v, int position, long id) {
System.out.println("URL "+ listImages.get(position) );
}
});
}
private InputStream openHttpConnection(String urlString) throws IOException {
InputStream in = null;
URL url = new URL(urlString);
URLConnection conn = url.openConnection();
conn.connect();
in=conn.getInputStream();
return in;
}
private Bitmap downloadImage( ImageView iView, String url) {
Bitmap bitmap = null;
InputStream in = null;
BufferedInputStream bis ;
try {
in = openHttpConnection(url);
bis= new BufferedInputStream(in, 8192);
bitmap = BitmapFactory.decodeStream(bis);
bis.close();
in.close();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
return bitmap;
}
private ArrayList<String> buildListImages() {
ArrayList<String> listImg = new ArrayList<String>();
for(Language l : listeLangues) {
listImg.add(URL+l.getImagePath());
}
return listImg;
}
public class AddImgAdp extends BaseAdapter {
int GalItemBg;
private Context cont;
public AddImgAdp(Context c) {
cont = c;
TypedArray typArray = obtainStyledAttributes(R.styleable.GalleryTheme);
GalItemBg = typArray.getResourceId(R.styleable.GalleryTheme_android_galleryItemBackground, 0);
typArray.recycle();
}
public int getCount() {
return listImages.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(final int position, View convertView, ViewGroup parent) {
if (convertView == null) {
imgView = new ImageView(cont);
} else {
imgView = (ImageView)convertView;
}
ThreadDownload progressDl= new ThreadDownload(position);
progressDl.start();
imgView.setLayoutParams(new Gallery.LayoutParams(150, 150));
imgView.setScaleType(ImageView.ScaleType.FIT_XY);
imgView.setBackgroundResource(GalItemBg);
return imgView;
}
}
private class SetImg extends Handler {
public void handleMessage(Message msg) {
imgView.setImageBitmap(bitmap);
}
}
private class ThreadDownload extends Thread {
SetImg img= new SetImg();
int position ;
public ThreadDownload(int position)
{
super();
this.position=position;
}
public void run() {
bitmap = downloadImage(imgView,listImages.get(position));
img.sendEmptyMessage(0);
}
}
}
You can make use of SmartImageView, it is a drop-in replacement for Android’s standard ImageView which additionally allows images to be loaded from URLs or the user’s contact address book. Images are cached to memory and to disk for super fast loading.
https://github.com/loopj/android-smart-image-view
My code as follows:
public class wall extends Activity {
GridView webgridview;
Button web;
ProgressDialog pd;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.wall);
pd = ProgressDialog.show(wall.this,"Loading", "Please Wait...",true);
new Thread() {
public void run() {
try {
webgridview.setAdapter(new WebImageAdapter(wall.this));
}catch(Exception e)
{
}
handler.sendEmptyMessage(0);
pd.dismiss();
}
}.start();
private Handler handler = new Handler() {
public void handleMessage(Message msg) {
Toast.makeText(wall.this, "finished", 1).show();
}
};
And my adapter class as follows. I code progress dialog in above class only.
public class WebImageAdapter extends BaseAdapter {
private Context mContext;
public static String[] myRemoteImages = {
"http://www.evergreenhits.com/ad/wallpapers/3d_1.jpg",
"http://www.evergreenhits.com/ad/wallpapers/3d_2.jpg",
"http://www.evergreenhits.com/ad/wallpapers/3d_3.jpg",
"http://www.evergreenhits.com/ad/wallpapers/3d_4.jpg",
"http://www.evergreenhits.com/ad/wallpapers/3d_5.jpg"
};
public WebImageAdapter(Context c) {
mContext = c;
}
public int getCount() {
//return animals.length;
return this.myRemoteImages.length;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
// create a new ImageView for each item referenced by the Adapter
public ImageView getView(int position, View convertView, ViewGroup parent) {
ImageView imageView;
imageView = new ImageView(mContext);
if (convertView == null) {
imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(8, 8, 8, 8);
} else {
imageView = (ImageView) convertView;
}
try {
URL aURL = new URL(myRemoteImages[position]);
URLConnection conn = aURL.openConnection();
conn.connect();
InputStream is = conn.getInputStream();
BufferedInputStream bis = new BufferedInputStream(is);
Drawable d=Drawable.createFromStream(bis, "src Name");
bis.close();
is.close();
imageView.setImageDrawable(d);
} catch (IOException e) {
Log.e("DEBUGTAG", "Remote Image Exception", e);
}
imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
imageView.setLayoutParams(new GridView.LayoutParams(150, 150));
return imageView;
}
The progress Dialog doesnt work properly. It shows and suddenly gone before the images loaded in gridview. Please help me asap.
Use AsyncTask:
calling:
dialog=ProgressDialog.show(wall.this,"Loading", "Please Wait...",true);
doback dob=new doback();
dob.execute();
Class
class doback extends AsyncTask<URL, Integer, Long>
{
#Override
protected Long doInBackground(URL... arg0)
{
try
{
//getImagepaths from Server
}
catch(Exception e)
{
}
return null;
}
protected void onProgressUpdate(Integer... progress)
{
}
protected void onPostExecute(Long result)
{
try
{
webgridview.setAdapter(new WebImageAdapter(wall.this));
dialog.dismiss();
}
catch(Exception e)
{
e.printStackTrace();
dialog.dismiss();
}
}
}
Adapter Code is some like this:
class WebImageAdapter extends BaseAdapter{
// #Override
public int getCount() {
return names.length;
}
// #Override
public Object getItem(int position) {
return null;
}
// #Override
public long getItemId(int position) {
return 0;
}
// #Override
public View getView(int pos, View convertView, ViewGroup parent) {
View row=getLayoutInflater().inflate(R.layout.nameitem,null);
ImageView image=(ImageView)row.findViewById(R.id.image);
image.setImageBitmap(convertImage(myRemoteImages[position]))// convertImage is to convert url to bitmap
return row;
}
}
Edit - From the Android Developer Documentation:ProgressDialog
This class was deprecated in API level 26.
ProgressDialog is a modal
dialog, which prevents the user from interacting with the app. Instead
of using this class, you should use a progress indicator like
ProgressBar, which can be embedded in your app's UI. Alternatively,
you can use a notification to inform the user of the task's progress.
setAdapter(), do not take more time, its getView() of Adapter class on each time hit web and taking time. So using of progressDialog on setAdapter is not appropriate. On scroll of your grids it took lot of time by using your code, as getView() call automatically on scrolling view.
you should have a reference from LazyList for loading image from web and placing them in ImageView.
friends,
i am using following global variables in my activity
private String Session_ID;
private String uid;
// menu item starts
private final int Trash = 0x003;
private final int More = 0x005;
private final int SignOut = 0x006;
private final int SignIn = 0x007;
//menu item ends
private EfficientAdapter adap;
private String[] Msg_id;
private String[] Msg_body;
private String[] Sent_by;
private String[] Sent_on;
private String[] Is_my_message;
private String[] Photo_thumbnail;
private String[] Photo_full_path;
private String Conversation_id;
ProgressBar progressBar;
Button getMoreButton;
boolean callComplete = false;
private Handler mHandler = new Handler();
private int PageSize = Constants.pageSizeForMessages;
Object serviceData = null;
private String ConversationName;
private Uri selectedImage;
public class EfficientAdapter extends BaseAdapter implements Filterable {
private LayoutInflater mInflater;
private Context context;
public EfficientAdapter(Context context) {
mInflater = LayoutInflater.from(context);
this.context = context;
}
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder;
convertView = mInflater.inflate(R.layout.adaptor_contentmessagedetail, null);
holder = new ViewHolder();
holder.ImgPhoto = (ImageView)convertView.findViewById(R.id.ImgPhoto);
holder.lblMsgSentBy = (TextView) convertView.findViewById(R.id.lblSentBy);
holder.lblMsgBody = (TextView) convertView.findViewById(R.id.lblMessageBody);
holder.lblMsgSentOn = (TextView) convertView.findViewById(R.id.lblSentOn);
convertView.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
if (!((MessageDetail)v.getContext()).isConnected()) {
Constants.DisplayMessage(v.getContext(),
Constants.CONNECTION_ERROR_MESSAGE);
return;
}
if(!Photo_full_path[position].equals(""))
{
String str= Photo_full_path[position].substring(Photo_full_path[position].length() - 3);
if(str.equals("pdf"))
{
}else
{
Intent myIntent = new Intent(v.getContext(), ViewSingleImage.class);
Bundle b = new Bundle();
b.putString("single_image_path", Photo_full_path[position] );
myIntent.putExtras(b);
v.getContext().startActivity(myIntent);
}
}
}
});
convertView.setTag(holder);
// Bind the data efficiently with the holder.
if(Is_my_message[position].equals("1"))
holder.lblMsgSentBy.setTextColor(Color.BLACK);
else
holder.lblMsgSentBy.setTextColor(Color.rgb(255, 107, 1));
SimpleDateFormat fromUser = new SimpleDateFormat(Constants.SERVICE_DATE_FORMAT);
java.text.DateFormat df=new SimpleDateFormat(Constants.DATE_FORMAT);
Date dt=new Date();
try
{
dt = fromUser.parse(Sent_on[position]);
} catch (java.text.ParseException e) {
e.printStackTrace();
}
// display photo
if(!Photo_thumbnail[position].equals(""))
{
// resize it
holder.ImgPhoto.setImageBitmap(DisplayLiveImage(Photo_thumbnail[position]));
}else
{
holder.ImgPhoto.setVisibility(View.GONE);
}
// display photo
holder.lblMsgSentBy.setText(Constants.GetSpecialCharacters(Sent_by[position]));
holder.lblMsgBody.setText(Constants.GetSpecialCharacters(Msg_body[position]));
holder.lblMsgSentOn.setText(df.format(dt));
return convertView;
}
class ViewHolder {
ImageView ImgPhoto;
TextView lblMsgSentBy;
TextView lblMsgBody;
TextView lblMsgSentOn;
}
#Override
public Filter getFilter() {
// TODO Auto-generated method stub
return null;
}
#Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return Msg_id.length;
}
#Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return Msg_id[position];
}
}
public Bitmap DisplayLiveImage(String ImageSrc)
{
Bitmap bm;
try {
URL aURL = new URL(ImageSrc);
URLConnection conn = aURL.openConnection();
conn.connect();
InputStream is = null;
try
{
is= conn.getInputStream();
}catch(IOException e)
{
return null;
}
BufferedInputStream bis = new BufferedInputStream(is);
bm = BitmapFactory.decodeStream(bis);
bis.close();
is.close();
} catch (IOException e) {
return null;
}
return bm;
}
i have made them global in activity because i need them all in more than 1 functions
now my question is how to improve performance of my activity it is too slow
should i make them static or what?
any help would be appreciated.
Your global variables are almost certainly not the cause of your poor performance. Unless you're accessing them a million times, it must be something else. If you tell us what exactly is performing slower than you would expect and post the relevant code, we might be able to help.
You have a LOT of code in your getView() method. this method gets called every single time a new view gets displayed. So when the listview is created, it's called N times where N being the number of list elements that are seen. Then when you scroll, every time a new element comes onto the screen, getView() gets called again. Even if you then scroll back up, it calls getView() again.
You need to refactor your code that doesn't need to be run every time a view is created out of the view.
it is recommended to cache images and dont bring them all again and again from internet.
so my case while using custom adapter and scrolling it was again and again loading images from internet
which was causing poor performance.
and memory leakage problem too.
so what i did i followed following tutorial to load live images and my problem resolved
Answer: LazyList
http://mobilebitworks.wordpress.com/2010/11/05/android-listview-and-dynamically-loading-images-from-the-web