Android复制Assets中大于1M的Zip压缩包，并解压到SD卡中 

  1 package com.demo.asset;
  2 
  3 import java.io.File;
  4 import java.io.FileOutputStream;
  5 import java.io.IOException;
  6 import java.io.InputStream;
  7 import java.io.OutputStream;
  8 import java.util.Enumeration;
  9 import java.util.zip.ZipEntry;
 10 import java.util.zip.ZipException;
 11 import java.util.zip.ZipFile;
 12 
 13 import android.app.Activity;
 14 import android.os.Bundle;
 15 import android.os.Environment;
 16 
 17 public class MainActivity extends Activity {
 18     /** Called when the activity is first created. */
 19 
 20     private String ASSETS_NAME = "SETTING.zip";
 21     private String DB_PATH = Environment.getExternalStorageDirectory() + "/word/rar/";
 22     private String DB_TOPATH = Environment.getExternalStorageDirectory() + "/word/db/";
 23     private String DB_NAME = "SETTING.zip";
 24 
 25     @Override
 26     public void onCreate(Bundle savedInstanceState) {
 27         super.onCreate(savedInstanceState);
 28         setContentView(R.layout.main);
 29         
 30         //拷贝文件
 31         try {
 32             copyDataBase();
 33         } catch (IOException e) {
 34             // TODO Auto-generated catch block
 35             e.printStackTrace();
 36         }
 37         
 38         //解压文件
 39         String path= DB_PATH + DB_NAME;
 40         File zipFile= new File(path);
 41         try {
 42             upZipFile(zipFile, DB_TOPATH);
 43         } catch (ZipException e) {
 44             // TODO Auto-generated catch block
 45             e.printStackTrace();
 46         } catch (IOException e) {
 47             // TODO Auto-generated catch block
 48             e.printStackTrace();
 49         }
 50         
 51     }
 52 
 53     private void copyDataBase() throws IOException {
 54         // Path to the just created empty db
 55         String outFileName = DB_PATH + DB_NAME;
 56         // 判断目录是否存在。如不存在则创建一个目录
 57         File file = new File(DB_PATH);
 58         if (!file.exists()) {
 59             file.mkdirs();
 60         }
 61         file = new File(outFileName);
 62         if (!file.exists()) {
 63             file.createNewFile();
 64         }
 65         // Open your local db as the input stream
 66         InputStream myInput = this.getAssets().open(ASSETS_NAME);
 67         // Open the empty db as the output stream128
 68         OutputStream myOutput = new FileOutputStream(outFileName);
 69         // transfer bytes from the inputfile to the outputfile130
 70         byte[] buffer = new byte[1024];
 71         int length;
 72         while ((length = myInput.read(buffer)) > 0) {
 73             myOutput.write(buffer, 0, length);
 74         }
 75         // Close the streams136
 76         myOutput.flush();
 77         myOutput.close();
 78         myInput.close();
 79     }
 80 
 81     /**
 82      * 解压缩一个文件
 83      * 
 84      * @param zipFile
 85      *            要解压的压缩文件
 86      * @param folderPath
 87      *            解压缩的目标目录
 88      * @throws IOException
 89      *             当解压缩过程出错时抛出
 90      */
 91     public void upZipFile(File zipFile, String folderPath) throws ZipException, IOException {
 92         File desDir = new File(folderPath);
 93         if (!desDir.exists()) {
 94             desDir.mkdirs();
 95         }
 96 
 97         ZipFile zf = new ZipFile(zipFile);
 98         for (Enumeration<?> entries = zf.entries(); entries.hasMoreElements();) {
 99             ZipEntry entry = ((ZipEntry) entries.nextElement());
100             InputStream in = zf.getInputStream(entry);
101             String str = folderPath + File.separator + entry.getName();
102             str = new String(str.getBytes("8859_1"), "GB2312");
103             File desFile = new File(str);
104             if (!desFile.exists()) {
105                 File fileParentDir = desFile.getParentFile();
106                 if (!fileParentDir.exists()) {
107                     fileParentDir.mkdirs();
108                 }
109                 desFile.createNewFile();
110             }
111             OutputStream out = new FileOutputStream(desFile);
112             byte buffer[] = new byte[1024];
113             int realLength;
114             while ((realLength = in.read(buffer)) > 0) {
115                 out.write(buffer, 0, realLength);
116             }
117             in.close();
118             out.close();
119         }
120     }
121 
122 }

 

posted on 2012-04-24 12:44  simpleceo  阅读(1860)  评论(0)  编辑  收藏  举报

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