引用：http://www.pocketdigi.com/20100916/110.html

布局XML：

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<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:id="@+id/tv" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="" /> <ProgressBar android:id="@+id/down_pb" android:layout_width="fill_parent" android:layout_height="wrap_content" android:max="100" style="?android:attr/progressBarStyleHorizontal" /> </LinearLayout>

這個就不用解釋了吧，兩個控件，一個是TextView,一個是橫向條狀進度條
程序main.java:

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package com.pocketdigi.download;import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.net.URL; import java.net.URLConnection;import org.apache.http.client.ClientProtocolException; import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.util.Log; import android.widget.ProgressBar; import android.widget.TextView; import android.widget.Toast;public class main extends Activity {/** Called when the activity is first created. */ProgressBar pb;TextView tv;int fileSize;int downLoadFileSize;String fileEx,fileNa,filename;private Handler handler = new Handler(){@Overridepublic void handleMessage(Message msg){//定義一個Handler，用于處理下載線程與UI間通訊if (!Thread.currentThread().isInterrupted()){switch (msg.what){case 0:pb.setMax(fileSize);case 1:pb.setProgress(downLoadFileSize);int result = downLoadFileSize * 100 / fileSize;tv.setText(result + "%");break;case 2:Toast.makeText(main.this, "文件下載完成", 1).show();break;case -1:String error = msg.getData().getString("error");Toast.makeText(main.this, error, 1).show();break;}}super.handleMessage(msg);}};@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);pb=(ProgressBar)findViewById(R.id.down_pb);tv=(TextView)findViewById(R.id.tv);new Thread(){public void run(){try {down_file("http://wallpaper.pocketdigi.com/upload/1/bigImage/1284565196.jpg","/sdcard/");//下載文件，參數：第一個URL，第二個存放路徑} catch (ClientProtocolException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}.start();}public void down_file(String url,String path) throws IOException{//下載函數 filename=url.substring(url.lastIndexOf("/") + 1);//獲取文件名URL myURL = new URL(url);URLConnection conn = myURL.openConnection();conn.connect();InputStream is = conn.getInputStream();this.fileSize = conn.getContentLength();//根據響應獲取文件大小if (this.fileSize <= 0) throw new RuntimeException("無法獲知文件大小 ");if (is == null) throw new RuntimeException("stream is null");FileOutputStream fos = new FileOutputStream(path+filename);//把數據存入路徑+文件名byte buf[] = new byte[1024];downLoadFileSize = 0;sendMsg(0);do{//循環讀取int numread = is.read(buf);if (numread == -1){break;}fos.write(buf, 0, numread);downLoadFileSize += numread;sendMsg(1);//更新進度條} while (true);sendMsg(2);//通知下載完成try{is.close();} catch (Exception ex){Log.e("tag", "error: " + ex.getMessage(), ex);}}private void sendMsg(int flag){Message msg = new Message();msg.what = flag;handler.sendMessage(msg);} } 源代碼： Android DownloadFile (1966)

轉載于:https://www.cnblogs.com/sode/archive/2011/09/26/2191636.html

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