Android 下载文件 显示进度条

加入两个权限

一个是联网，另一个是读写SD卡

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1 2	<uses-permission android:name="android.permission.INTERNET"></uses-permission> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>

 

下载地址是本人的另外一台主机，现在当服务器了，路径可以测试

http://210.30.12.1:8080/mp3/DJ.mp3

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import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.io.RandomAccessFile; import java.net.MalformedURLException; import java.net.URL; import java.net.URLConnection;   import android.app.Activity; import android.os.Bundle; import android.os.Environment; import android.os.Handler; import android.os.Message; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.ProgressBar; import android.widget.TextView; import android.widget.Toast;   public class FileDownProcessBarActivity extends Activity {     /** Called when the activity is first created. */     private static final String Path="http://210.30.12.1:8080/mp3/DJ.mp3";     private ProgressBar progressBar;     private TextView textView;     private Button button;     private int FileLength;     private int DownedFileLength=0;     private InputStream inputStream;     private URLConnection connection;     private OutputStream outputStream;     @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);         progressBar=(ProgressBar) findViewById(R.id.progressBar1);         textView=(TextView) findViewById(R.id.textView2);         button=(Button) findViewById(R.id.button1);         button.setOnClickListener(new ButtonListener());     }     class ButtonListener implements OnClickListener{           @Override         public void onClick(View v) {             DownedFileLength=0;             // TODO Auto-generated method stub            Thread thread=new Thread(){              public void run(){                  try {                     DownFile(Path);                 } catch (Exception e) {                     // TODO: handle exception                 }              }            };            thread.start();         }       }     private Handler handler=new Handler()     {          public void handleMessage(Message msg)         {         if (!Thread.currentThread().isInterrupted()) {             switch (msg.what) {             case 0:                 progressBar.setMax(FileLength);                 Log.i("文件长度----------->", progressBar.getMax()+"");                  break;             case 1:                 progressBar.setProgress(DownedFileLength);                 int x=DownedFileLength*100/FileLength;                 textView.setText(x+"%");                 break;             case 2:                 Toast.makeText(getApplicationContext(), "下载完成", Toast.LENGTH_LONG).show();                 break;                               default:                 break;             }         }           }                };       private void DownFile(String urlString)     {                   /*          * 连接到服务器          */                   try {              URL url=new URL(urlString);              connection=url.openConnection();              if (connection.getReadTimeout()==5) {                 Log.i("---------->", "当前网络有问题");                 // return;                }              inputStream=connection.getInputStream();                       } catch (MalformedURLException e1) {             // TODO Auto-generated catch block             e1.printStackTrace();         } catch (IOException e) {             // TODO Auto-generated catch block             e.printStackTrace();         }                   /*          * 文件的保存路径和和文件名其中Nobody.mp3是在手机SD卡上要保存的路径，如果不存在则新建          */         String savePAth=Environment.getExternalStorageDirectory()+"/DownFile";         File file1=new File(savePAth);         if (!file1.exists()) {             file1.mkdir();         }         String savePathString=Environment.getExternalStorageDirectory()+"/DownFile/"+"DJ.mp3";         File file =new File(savePathString);         if (!file.exists()) {             try {                 file.createNewFile();             } catch (IOException e) {                 // TODO Auto-generated catch block                 e.printStackTrace();             }           }         /*          * 向SD卡中写入文件,用Handle传递线程          */         Message message=new Message();         try {             outputStream=new FileOutputStream(file);             byte [] buffer=new byte[1024*4];             FileLength=connection.getContentLength();             message.what=0;             handler.sendMessage(message);             while (DownedFileLength<FileLength) {                 outputStream.write(buffer);                 DownedFileLength+=inputStream.read(buffer);                 Log.i("-------->", DownedFileLength+"");                 Message message1=new Message();                 message1.what=1;                 handler.sendMessage(message1);             }             Message message2=new Message();             message2.what=2;             handler.sendMessage(message2);         } catch (FileNotFoundException e) {             // TODO Auto-generated catch block             e.printStackTrace();         } catch (IOException e) {             // TODO Auto-generated catch block             e.printStackTrace();         }     }         }