Android下载多个资料时的进度条

Android下载多个文件时的进度条

布局文件：

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"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <ListView         android:id="@+id/imageList"        android:layout_width="match_parent"        android:layout_height="wrap_content" /></RelativeLayout>

<?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"        android:contentDescription="@string/image" /> </LinearLayout>

RowItem.java

import android.graphics.Bitmap;public class RowItem {private Bitmap bitmapImage;public RowItem(Bitmap bitmap) {this.bitmapImage = bitmap;}public Bitmap getBitmap() {return bitmapImage;}public void setBitmap(Bitmap bitmap) {this.bitmapImage = bitmap;}}

FileUtils.java

import java.io.InputStream;import java.io.OutputStream;public class FileUtils {public static void close(InputStream in) {if (in != null) {try {in.close();} catch (Exception e) {e.printStackTrace();}}}public static void close(OutputStream out) {if (out != null) {try {out.close();} catch (Exception e) {e.printStackTrace();}}}}

CustomListViewAdapter.java

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 mContext;List<RowItem> rowItems;public CustomListViewAdapter(Context context, List<RowItem> items) {this.mContext = context;this.rowItems = items;}private class ViewHolder {ImageView imageView;}@Overridepublic int getCount() {return rowItems.size();}@Overridepublic Object getItem(int position) {return rowItems.get(position);}@Overridepublic long getItemId(int position) {return 0;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {ViewHolder holder = null;LayoutInflater inflater = (LayoutInflater)mContext.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);if (convertView == null) {convertView = inflater.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) rowItems.get(position);holder.imageView.setImageBitmap(rowItem.getBitmap());return convertView;}}

MainActivity.java

import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.ByteArrayOutputStream;import java.io.InputStream;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.view.Menu;import android.widget.ListView;//记得在manifest.xml中添加访问网络的权限public class MainActivity extends Activity {ProgressDialog progressDialog;CustomListViewAdapter listViewAdapter;ListView listView;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);listView = (ListView) findViewById(R.id.imageList);DownloadTask task = new DownloadTask(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.setCancelable(true);progressDialog.show();}private class DownloadTask extends AsyncTask<String, Integer, List<RowItem> > {private Activity context;List<RowItem> rowItems;int taskCount;public DownloadTask(Activity context) {this.context = context;}@Overrideprotected List<RowItem> doInBackground(String... urls) {taskCount = urls.length;rowItems = new ArrayList<RowItem>();Bitmap map = null;for (String url : urls) {map = downloadImage(url);rowItems.add(new RowItem(map));}return rowItems;}protected void onProgressUpdate(Integer... progress) {progressDialog.setProgress(progress[0]);if (rowItems != null) {progressDialog.setMessage("Loading " + (rowItems.size() + 1) + "/" + taskCount);}}@Overrideprotected void onPostExecute(List<RowItem> rowItems) {listViewAdapter = new CustomListViewAdapter(context, rowItems);listView.setAdapter(listViewAdapter);progressDialog.dismiss();}private Bitmap downloadImage(String urlString) {int count = 0;Bitmap bitmap = null;URL url;InputStream in = null;BufferedOutputStream out = null;try {url = new URL(urlString);URLConnection conn = url.openConnection();int lengthOfFile = conn.getContentLength();in = new BufferedInputStream(url.openStream());ByteArrayOutputStream dataStream = new ByteArrayOutputStream();out = new BufferedOutputStream(dataStream);byte[] data = new byte[512];long total = 0L;while ((count = in.read(data)) != -1) {total += count;publishProgress((int)((total * 100) / lengthOfFile));out.write(data, 0, count);}out.flush();BitmapFactory.Options options = new BitmapFactory.Options();options.inSampleSize = 1;byte[] bytes = dataStream.toByteArray();bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);} catch (Exception e) {e.printStackTrace();}return bitmap;}}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}//URL地址public static final String URL = "http://gdown.baidu.com/data/wisegame/60288c8f92238775/FruitNinja_1809.apk";public static final String URL1 ="http://gdown.baidu.com/data/wisegame/60288c8f92238775/FruitNinja_1809.apk";   public static final String URL2 = "http://gdown.baidu.com/data/wisegame/60288c8f92238775/FruitNinja_1809.apk";   }