Android开发中怎么实现一个下载zip压缩文件的功能-创新互联

今天就跟大家聊聊有关Android开发中怎么实现一个下载zip压缩文件的功能，可能很多人都不太了解，为了让大家更加了解，小编给大家总结了以下内容，希望大家根据这篇文章可以有所收获。

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import java.io.BufferedInputStream; 
import java.io.BufferedOutputStream; 
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.net.MalformedURLException; 
import java.net.URL; 
import java.net.URLConnection; 
 
import android.app.ProgressDialog; 
import android.content.Context; 
import android.content.DialogInterface; 
import android.content.DialogInterface.OnCancelListener; 
import android.os.AsyncTask; 
import android.util.Log; 
 
public class DownLoaderTask extends AsyncTask { 
 private final String TAG = "DownLoaderTask"; 
 private URL mUrl; 
 private File mFile; 
 private ProgressDialog mDialog; 
 private int mProgress = 0; 
 private ProgressReportingOutputStream mOutputStream; 
 private Context mContext; 
 public DownLoaderTask(String url,String out,Context context){ 
  super(); 
  if(context!=null){ 
   mDialog = new ProgressDialog(context); 
   mContext = context; 
  } 
  else{ 
   mDialog = null; 
  } 
   
  try { 
   mUrl = new URL(url); 
   String fileName = new File(mUrl.getFile()).getName(); 
   mFile = new File(out, fileName); 
   Log.d(TAG, "out="+out+", name="+fileName+",mUrl.getFile()="+mUrl.getFile()); 
  } catch (MalformedURLException e) { 
   // TODO Auto-generated catch block 
   e.printStackTrace(); 
  } 
   
 } 
  
 @Override 
 protected void onPreExecute() { 
  // TODO Auto-generated method stub 
  //super.onPreExecute(); 
  if(mDialog!=null){ 
   mDialog.setTitle("Downloading..."); 
   mDialog.setMessage(mFile.getName()); 
   mDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); 
   mDialog.setOnCancelListener(new OnCancelListener() { 
     
    @Override 
    public void onCancel(DialogInterface dialog) { 
     // TODO Auto-generated method stub 
     cancel(true); 
    } 
   }); 
   mDialog.show(); 
  } 
 } 
 
 @Override 
 protected Long doInBackground(Void... params) { 
  // TODO Auto-generated method stub 
  return download(); 
 } 
 
 @Override 
 protected void onProgressUpdate(Integer... values) { 
  // TODO Auto-generated method stub 
  //super.onProgressUpdate(values); 
  if(mDialog==null) 
   return; 
  if(values.length>1){ 
   int contentLength = values[1]; 
   if(contentLength==-1){ 
    mDialog.setIndeterminate(true); 
   } 
   else{ 
    mDialog.setMax(contentLength); 
   } 
  } 
  else{ 
   mDialog.setProgress(values[0].intValue()); 
  } 
 } 
 
 @Override 
 protected void onPostExecute(Long result) { 
  // TODO Auto-generated method stub 
  //super.onPostExecute(result); 
  if(mDialog!=null&&mDialog.isShowing()){ 
   mDialog.dismiss(); 
  } 
  if(isCancelled()) 
   return; 
  ((MainActivity)mContext).showUnzipDialog(); 
 } 
 
 private long download(){ 
  URLConnection connection = null; 
  int bytesCopied = 0; 
  try { 
   connection = mUrl.openConnection(); 
   int length = connection.getContentLength(); 
   if(mFile.exists()&&length == mFile.length()){ 
    Log.d(TAG, "file "+mFile.getName()+" already exits!!"); 
    return 0l; 
   } 
   mOutputStream = new ProgressReportingOutputStream(mFile); 
   publishProgress(0,length); 
   bytesCopied =copy(connection.getInputStream(),mOutputStream); 
   if(bytesCopied!=length&&length!=-1){ 
    Log.e(TAG, "Download incomplete bytesCopied="+bytesCopied+", length"+length); 
   } 
   mOutputStream.close(); 
  } catch (IOException e) { 
   // TODO Auto-generated catch block 
   e.printStackTrace(); 
  } 
  return bytesCopied; 
 } 
 private int copy(InputStream input, OutputStream output){ 
  byte[] buffer = new byte[1024*8]; 
  BufferedInputStream in = new BufferedInputStream(input, 1024*8); 
  BufferedOutputStream out = new BufferedOutputStream(output, 1024*8); 
  int count =0,n=0; 
  try { 
   while((n=in.read(buffer, 0, 1024*8))!=-1){ 
    out.write(buffer, 0, n); 
    count+=n; 
   } 
   out.flush(); 
  } catch (IOException e) { 
   // TODO Auto-generated catch block 
   e.printStackTrace(); 
  }finally{ 
   try { 
    out.close(); 
   } catch (IOException e) { 
    // TODO Auto-generated catch block 
    e.printStackTrace(); 
   } 
   try { 
    in.close(); 
   } catch (IOException e) { 
    // TODO Auto-generated catch block 
    e.printStackTrace(); 
   } 
  } 
  return count; 
 } 
 private final class ProgressReportingOutputStream extends FileOutputStream{ 
 
  public ProgressReportingOutputStream(File file) 
    throws FileNotFoundException { 
   super(file); 
   // TODO Auto-generated constructor stub 
  } 
 
  @Override 
  public void write(byte[] buffer, int byteOffset, int byteCount) 
    throws IOException { 
   // TODO Auto-generated method stub 
   super.write(buffer, byteOffset, byteCount); 
   mProgress += byteCount; 
   publishProgress(mProgress); 
  } 
   
 } 
} 

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