Android中實現下載和解壓zip文件功能代碼分享

2020-04-11 11:38:55

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本文提供了2段Android代碼，實現了從Android客戶端下載ZIP文件并且實現ZIP文件的解壓功能，非常實用，有需要的Android開發者可以嘗試一下。

下載：

DownLoaderTask.java

package com.johnny.testzipanddownload;
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<Void, Integer, Long> {
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);
}

}
}

解壓：

ZipExtractorTask .java

復制代碼代碼如下:

package com.johnny.testzipanddownload;
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.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException;
import java.util.zip.ZipFile;
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 ZipExtractorTask extends AsyncTask<Void, Integer, Long> {
private final String TAG = "ZipExtractorTask";
private final File mInput;
private final File mOutput;
private final ProgressDialog mDialog;
private int mProgress = 0;
private final Context mContext;
private boolean mReplaceAll;
public ZipExtractorTask(String in, String out, Context context, boolean replaceAll){
super();
mInput = new File(in);
mOutput = new File(out);
if(!mOutput.exists()){
   if(!mOutput.mkdirs()){
    Log.e(TAG, "Failed to make directories:"+mOutput.getAbsolutePath());
   }
}
if(context!=null){
   mDialog = new ProgressDialog(context);
}
else{
   mDialog = null;
}
mContext = context;
mReplaceAll = replaceAll;
}
@Override
protected Long doInBackground(Void... params) {
// TODO Auto-generated method stub
return unzip();
}

@Override
protected void onPostExecute(Long result) {
// TODO Auto-generated method stub
//super.onPostExecute(result);
if(mDialog!=null&&mDialog.isShowing()){
   mDialog.dismiss();
}
if(isCancelled())
   return;
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
//super.onPreExecute();
if(mDialog!=null){
   mDialog.setTitle("Extracting");
   mDialog.setMessage(mInput.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 void onProgressUpdate(Integer... values) {
// TODO Auto-generated method stub
//super.onProgressUpdate(values);
if(mDialog==null)
   return;
if(values.length>1){
   int max=values[1];
   mDialog.setMax(max);
}
else
   mDialog.setProgress(values[0].intValue());
}
private long unzip(){
long extractedSize = 0L;
Enumeration<ZipEntry> entries;
ZipFile zip = null;
try {
   zip = new ZipFile(mInput);
   long uncompressedSize = getOriginalSize(zip);
   publishProgress(0, (int) uncompressedSize);

   entries = (Enumeration<ZipEntry>) zip.entries();
   while(entries.hasMoreElements()){
    ZipEntry entry = entries.nextElement();
    if(entry.isDirectory()){
     continue;
    }
    File destination = new File(mOutput, entry.getName());
    if(!destination.getParentFile().exists()){
     Log.e(TAG, "make="+destination.getParentFile().getAbsolutePath());
     destination.getParentFile().mkdirs();
    }
    if(destination.exists()&&mContext!=null&&!mReplaceAll){

    }
    ProgressReportingOutputStream outStream = new ProgressReportingOutputStream(destination);
    extractedSize+=copy(zip.getInputStream(entry),outStream);
    outStream.close();
   }
} catch (ZipException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
} catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
}finally{
   try {
    zip.close();
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
}
return extractedSize;
}
private long getOriginalSize(ZipFile file){
Enumeration<ZipEntry> entries = (Enumeration<ZipEntry>) file.entries();
long originalSize = 0l;
while(entries.hasMoreElements()){
   ZipEntry entry = entries.nextElement();
   if(entry.getSize()>=0){
    originalSize+=entry.getSize();
   }
}
return originalSize;
}

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);
}

}
}

Main Activity

MainActivity.java

復制代碼代碼如下:

package com.johnny.testzipanddownload;
import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.util.Log;
import android.view.Menu;
public class MainActivity extends Activity {
private final String TAG="MainActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.d(TAG, "Environment.getExternalStorageDirectory()="+Environment.getExternalStorageDirectory());
Log.d(TAG, "getCacheDir().getAbsolutePath()="+getCacheDir().getAbsolutePath());

showDownLoadDialog();
//doZipExtractorWork();
//doDownLoadWork();
}
@Override
public 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;
}

private void showDownLoadDialog(){
new AlertDialog.Builder(this).setTitle("確認")
.setMessage("是否下載？")
.setPositiveButton("是", new OnClickListener() {

   @Override
   public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    Log.d(TAG, "onClick 1 = "+which);
    doDownLoadWork();
   }
})
.setNegativeButton("否", new OnClickListener() {

   @Override
   public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    Log.d(TAG, "onClick 2 = "+which);
   }
})
.show();
}

public void showUnzipDialog(){
new AlertDialog.Builder(this).setTitle("確認")
.setMessage("是否解壓？")
.setPositiveButton("是", new OnClickListener() {

   @Override
   public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    Log.d(TAG, "onClick 1 = "+which);
    doZipExtractorWork();
   }
})
.setNegativeButton("否", new OnClickListener() {

   @Override
   public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    Log.d(TAG, "onClick 2 = "+which);
   }
})
.show();
}

public void doZipExtractorWork(){
//ZipExtractorTask task = new ZipExtractorTask("/storage/usb3/system.zip", "/storage/emulated/legacy/", this, true);
ZipExtractorTask task = new ZipExtractorTask("/storage/emulated/legacy/testzip.zip", "/storage/emulated/legacy/", this, true);
task.execute();
}

private void doDownLoadWork(){
DownLoaderTask task = new DownLoaderTask("http://192.168.9.155/johnny/testzip.zip", "/storage/emulated/legacy/", this);
//DownLoaderTask task = new DownLoaderTask("http://192.168.9.155/johnny/test.h264", getCacheDir().getAbsolutePath()+"/", this);
task.execute();
}
}

以上就是Android實現zip文件下載和解壓功能，希望對你有所幫助。

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