1) Create class CustomListViewAdapter.java
==============================
package com.example.showdownloadprogression;
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
public class CustomListViewAdapter extends BaseAdapter {
Context context;
List<RowItem> rowItems;
public CustomListViewAdapter(Context context, List<RowItem> items) {
this.context = context;
this.rowItems = items;
}
private class ViewHolder {
ImageView imageView;
}
public int getCount() {
return rowItems.size();
}
public Object getItem(int position) {
return rowItems.get(position);
}
public long getItemId(int position) {
return 0;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
LayoutInflater mInflater = (LayoutInflater) context
.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
convertView = mInflater.inflate(R.layout.list_item, null);
holder = new ViewHolder();
holder.imageView = (ImageView) convertView
.findViewById(R.id.thumbnail);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
RowItem rowItem = (RowItem) getItem(position);
holder.imageView.setImageBitmap(rowItem.getBitmapImage());
return convertView;
}
}
2) Create class FileUtils.java
====================
package com.example.showdownloadprogression;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
public class FileUtils {
public static void close(InputStream stream) {
if(stream != null) {
try {
stream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public static void close(OutputStream stream) {
if(stream != null) {
try {
stream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
3) Create class MainActivity.java
=======================
package com.example.showdownloadprogression;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.app.ProgressDialog;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.widget.ListView;
public class MainActivity extends Activity {
ProgressDialog progressDialog;
CustomListViewAdapter listViewAdapter;
ListView listView;
public static final String URL =
"http://theopentutorials.com/totwp331/wp-content/uploads/totlogo.png";
public static final String URL1 =
"http://theopentutorials.com/totwp331/wp-content/uploads/totlogo.png";
public static final String URL2 =
"http://theopentutorials.com/totwp331/wp-content/uploads/totlogo.png";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.imageList);
/*Creating and executing background task*/
GetXMLTask task = new GetXMLTask(this);
task.execute(new String[] { URL, URL1, URL2 });
progressDialog = new ProgressDialog(this);
progressDialog.setTitle("In progress...");
progressDialog.setMessage("Loading...");
progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progressDialog.setIndeterminate(false);
progressDialog.setMax(100);
progressDialog.setIcon(R.drawable.arrow);
progressDialog.setCancelable(true);
progressDialog.show();
}
//
// @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;
// }
private class GetXMLTask extends AsyncTask<String, Integer, List<RowItem>> {
private Activity context;
List<RowItem> rowItems;
int noOfURLs;
public GetXMLTask(Activity context) {
this.context = context;
}
@Override
protected List<RowItem> doInBackground(String... urls) {
noOfURLs = urls.length;
rowItems = new ArrayList<RowItem>();
Bitmap map = null;
for (String url : urls) {
map = downloadImage(url);
rowItems.add(new RowItem(map));
}
return rowItems;
}
private Bitmap downloadImage(String urlString) {
int count = 0;
Bitmap bitmap = null;
URL url;
InputStream inputStream = null;
BufferedOutputStream outputStream = null;
try {
url = new URL(urlString);
URLConnection connection = url.openConnection();
int lenghtOfFile = connection.getContentLength();
inputStream = new BufferedInputStream(url.openStream());
ByteArrayOutputStream dataStream = new ByteArrayOutputStream();
outputStream = new BufferedOutputStream(dataStream);
byte data[] = new byte[512];
long total = 0;
while ((count = inputStream.read(data)) != -1) {
total += count;
/*publishing progress update on UI thread.
Invokes onProgressUpdate()*/
publishProgress((int)((total*100)/lenghtOfFile));
// writing data to byte array stream
outputStream.write(data, 0, count);
}
outputStream.flush();
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
bmOptions.inSampleSize = 1;
byte[] bytes = dataStream.toByteArray();
bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length,bmOptions);
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
FileUtils.close(inputStream);
FileUtils.close(outputStream);
}
return bitmap;
}
protected void onProgressUpdate(Integer... progress) {
progressDialog.setProgress(progress[0]);
if(rowItems != null) {
progressDialog.setMessage("Loading " + (rowItems.size()+1) + "/" + noOfURLs);
}
}
@Override
protected void onPostExecute(List<RowItem> rowItems) {
listViewAdapter = new CustomListViewAdapter(context, rowItems);
listView.setAdapter(listViewAdapter);
progressDialog.dismiss();
}
}
}
4) Create class RowItem.java
====================
package com.example.showdownloadprogression;
import android.graphics.Bitmap;
public class RowItem {
private Bitmap bitmapImage;
public RowItem(Bitmap bitmapImage) {
this.bitmapImage = bitmapImage;
}
public Bitmap getBitmapImage() {
return bitmapImage;
}
public void setBitmapImage(Bitmap bitmapImage) {
this.bitmapImage = bitmapImage;
}
}
5)activity_main.xml
=============
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<ListView
android:id="@+id/imageList"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</RelativeLayout>
6) list_item.xml
============
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="10dp" >
<ImageView
android:id="@+id/thumbnail"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
7) in values-v11 style.xml
=================
<resources>
<style name="AppBaseTheme" parent="android:Theme.Holo.Light">
<!-- API 11 theme customizations can go here. -->
</style>
</resources>
8) in values-v14 style.xml
==================
<resources>
<style name="AppBaseTheme" parent="android:Theme.Holo.Light.DarkActionBar">
<!-- API 14 theme customizations can go here. -->
</style>
</resources>
9) Don't forget to give permission of "Internet" & "Access_Network_State"
