Hi,
I am using lazy list example i.e., image loader class. but
the progress bar is not showing..
package com.self
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Collections;
import java.util.Map;
import java.util.WeakHashMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.view.View;
import android.widget.ImageView;
import android.widget.ProgressBar;
import com.self.R;
public class ImageLoader {
MemoryCache memoryCache = new MemoryCache();
FileCache fileCache;
private Map<ImageView, String> imageViews =
Collections.synchronizedMap(new WeakHashMap<ImageView, String>());
ExecutorService executorService;
ProgressBar progDialog;
public ImageLoader(Context context) {
fileCache = new FileCache(context);
executorService = Executors.newFixedThreadPool(5);
progDialog = new ProgressBar(context);
progDialog.setBackgroundColor(Color.WHITE);
}
final int stub_id = R.drawable.blank_image;
public void displayImage(String url, ImageView imageView) {
imageViews.put(imageView, url);
Bitmap bitmap = memoryCache.get(url);
if (bitmap != null) {
progDialog.setVisibility(View.GONE);
imageView.setImageBitmap(bitmap);
}
else {
queuePhoto(url, imageView);
imageView.setImageResource(stub_id);
}
}
private void queuePhoto(String url, ImageView imageView) {
PhotoToLoad p = new PhotoToLoad(url, imageView);
executorService.submit(new PhotosLoader(p));
}
private Bitmap getBitmap(String url) {
File f = fileCache.getFile(url);
// from SD cache
Bitmap b = decodeFile(f);
if (b != null)
return b;
// from web
try {
Bitmap bitmap = null;
URL imageUrl = new URL(url);
HttpURLConnection conn = (HttpURLConnection) imageUrl
.openConnection();
conn.setConnectTimeout(30000);
conn.setReadTimeout(30000);
conn.setInstanceFollowRedirects(true);
InputStream is = conn.getInputStream();
OutputStream os = new FileOutputStream(f);
Utils.CopyStream(is, os);
os.close();
bitmap = decodeFile(f);
return bitmap;
} catch (Exception ex) {
ex.printStackTrace();
return null;
}
}
// decodes image and scales it to reduce memory consumption
private Bitmap decodeFile(File f) {
try {
// decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(f),
null, o);
// Find the correct scale value. It should be the power
of 2.
final int REQUIRED_SIZE = 70;
int width_tmp = o.outWidth, height_tmp = o.outHeight;
int scale = 1;
while (true) {
if (width_tmp / 2 < REQUIRED_SIZE
|| height_tmp / 2 <
REQUIRED_SIZE)
break;
width_tmp /= 2;
height_tmp /= 2;
scale *= 2;
}
// decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
return BitmapFactory.decodeStream(new
FileInputStream(f), null,
o2);
} catch (FileNotFoundException e) {
}
return null;
}
// Task for the queue
private class PhotoToLoad {
public String url;
public ImageView imageView;
public PhotoToLoad(String u, ImageView i) {
url = u;
imageView = i;
}
}
class PhotosLoader implements Runnable {
PhotoToLoad photoToLoad;
PhotosLoader(PhotoToLoad photoToLoad) {
this.photoToLoad = photoToLoad;
}
@Override
public void run() {
if (imageViewReused(photoToLoad))
return;
Bitmap bmp = getBitmap(photoToLoad.url);
memoryCache.put(photoToLoad.url, bmp);
if (imageViewReused(photoToLoad))
return;
BitmapDisplayer bd = new BitmapDisplayer(bmp,
photoToLoad);
Activity a = (Activity)
photoToLoad.imageView.getContext();
a.runOnUiThread(bd);
}
}
boolean imageViewReused(PhotoToLoad photoToLoad) {
String tag = imageViews.get(photoToLoad.imageView);
if (tag == null || !tag.equals(photoToLoad.url))
return true;
return false;
}
// Used to display bitmap in the UI thread
class BitmapDisplayer implements Runnable {
Bitmap bitmap;
PhotoToLoad photoToLoad;
public BitmapDisplayer(Bitmap b, PhotoToLoad p) {
bitmap = b;
photoToLoad = p;
}
public void run() {
if (imageViewReused(photoToLoad))
return;
if (bitmap != null) {
progDialog.setVisibility(View.GONE);
photoToLoad.imageView.setImageBitmap(bitmap);
}
else
photoToLoad.imageView.setImageResource(stub_id);
}
}
public void clearCache() {
memoryCache.clear();
fileCache.clear();
}
}
can u please tell how to do...
On Mar 5, 5:52 pm, ANKUR GOEL <ankur1...@gmail.com> wrote:
> just put progress bar before imageView in xml and hide the progress bar as
> the image downloads
>
> ProgressBar progressBar = (ProgressBar)
> layout.findViewById(R.id.progressbar_default);
>
> if(bitmap != null){
> imageView.setImageBitmap(bitmap);
> imageView.setVisibility(View.VISIBLE);
> progressBar.setVisibility(View.GONE);
> }else{
> imageView.setVisibility(View.GONE);
> progressBar.setVisibility(View.VISIBLE);
> }
>
>
>
>
>
>
>
> On Mon, Mar 5, 2012 at 6:17 PM, Seshu <s.seshu...@gmail.com> wrote:
> > Hi all,
> > I am using grid view and i am downloading the images from
> > internet and need to place in gridview. when images are downloading means i
> > need to show the progress dialog for each photo downloading in gridview.
> > for reference i am attached the image. Can any one help me how to achieve
> > this task.
>
> > Thanks and Regards,
> > S.Seshu.
> > s.seshu143(at)gmail(dot)com
>
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