使用 java.util.zip 解壓 ZIP 壓縮檔案

Android API 提供 java.util.zip 包, 可以用來解壓 ZIP 壓縮檔案.

範例:
本程序解壓縮指定的 ZIP 壓縮檔案(/sdcard/test/ziptest.zip), 並儲存於指定的文件夾(/sdcard/test/).

package com.AndroidUnzip;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class AndroidUnzip extends Activity {
 
 TextView textMsg;
 static final int BUFFER_SIZE = 4096;
 String srcPath = "/sdcard/test/ziptest.zip";
 String destPath = "/sdcard/test/";

 String msg = "";
 
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
       textMsg = (TextView)findViewById(R.id.msg);
       unZip();
   }
  
   private void appendMsg(String tMsg){
    msg += tMsg + "\n";
    textMsg.setText(msg);
   }
  
   private void unZip(){
    BufferedOutputStream bufferedOutputStream = null;
    FileInputStream fileInputStream;
  try {
   fileInputStream = new FileInputStream(srcPath);
   ZipInputStream zipInputStream = new ZipInputStream(new BufferedInputStream(fileInputStream));
   ZipEntry zipEntry;
   

   while ((zipEntry = zipInputStream.getNextEntry()) != null){
    
    appendMsg(" ----- ");
    appendMsg("Zip Entry: " + zipEntry.toString());
    
    String zipEntryName = zipEntry.getName();
    appendMsg(destPath + zipEntryName);
    
    File file = new File(destPath + zipEntryName);

    if (file.exists()){
     appendMsg("Already exist! Skip");
    } else {
     if(zipEntry.isDirectory()){
      appendMsg("make dir: " + file.getPath());
      file.mkdirs();
     }else{
      appendMsg("unzip: " + file.getPath());
      
      byte buffer[] = new byte[BUFFER_SIZE];
                  FileOutputStream fileOutputStream = new FileOutputStream(file);
                  bufferedOutputStream = new BufferedOutputStream(fileOutputStream, BUFFER_SIZE);
                 
                  int count;
                  while ((count = zipInputStream.read(buffer, 0, BUFFER_SIZE)) != -1) {
                   bufferedOutputStream.write(buffer, 0, count);
      }
                  bufferedOutputStream.flush();
                  bufferedOutputStream.close();
     }
    }
   }
   
   zipInputStream.close();
   appendMsg(" ------------ ");
   appendMsg(" - Finished - ");
  } catch (FileNotFoundException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
   appendMsg(e.toString());
  }catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
   appendMsg(e.toString());
  }
   }
}

main.xml 佈局

<?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:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="@string/hello"
   />
<TextView
   android:id="@+id/msg" 
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   />
</LinearLayout>

因本程序需要把解壓後的文件寫回到 SD Card, 所以須修改 AndroidManifest.xml 授予"android.permission.WRITE_EXTERNAL_STORAGE"權限.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.AndroidUnzip"
     android:versionCode="1"
     android:versionName="1.0">
   <uses-sdk android:minSdkVersion="4" />
   <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>

   <application android:icon="@drawable/icon" android:label="@string/app_name">
       <activity android:name=".AndroidUnzip"
                 android:label="@string/app_name">
           <intent-filter>
               <action android:name="android.intent.action.MAIN" />
               <category android:name="android.intent.category.LAUNCHER" />
           </intent-filter>
       </activity>

   </application>
</manifest>