package com.demo.asset;
import java.io.File;
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.Activity;
import android.os.Bundle;
import android.os.Environment;
public class MainActivity extends Activity {
/** Called when the activity is first created. */
private String ASSETS_NAME = "SETTING.zip";
private String DB_PATH = Environment.getExternalStorageDirectory() + "/word/rar/";
private String DB_TOPATH = Environment.getExternalStorageDirectory() + "/word/db/";
private String DB_NAME = "SETTING.zip";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//拷贝文件
try {
copyDataBase();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//解压文件
String path= DB_PATH + DB_NAME;
File zipFile= new File(path);
try {
upZipFile(zipFile, DB_TOPATH);
} catch (ZipException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void copyDataBase() throws IOException {
// Path to the just created empty db
String outFileName = DB_PATH + DB_NAME;
// 判断目录是否存在。如不存在则创建一个目录
File file = new File(DB_PATH);
if (!file.exists()) {
file.mkdirs();
}
file = new File(outFileName);
if (!file.exists()) {
file.createNewFile();
}
// Open your local db as the input stream
InputStream myInput = this.getAssets().open(ASSETS_NAME);
// Open the empty db as the output stream128
OutputStream myOutput = new FileOutputStream(outFileName);
// transfer bytes from the inputfile to the outputfile130
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer)) > 0) {
myOutput.write(buffer, 0, length);
}
// Close the streams136
myOutput.flush();
myOutput.close();
myInput.close();
}
/**
* 解压缩一个文件
*
* @param zipFile
* 要解压的压缩文件
* @param folderPath
* 解压缩的目标目录
* @throws IOException
* 当解压缩过程出错时抛出
*/
public void upZipFile(File zipFile, String folderPath) throws ZipException, IOException {
File desDir = new File(folderPath);
if (!desDir.exists()) {
desDir.mkdirs();
}
ZipFile zf = new ZipFile(zipFile);
for (Enumeration<?> entries = zf.entries(); entries.hasMoreElements();) {
ZipEntry entry = ((ZipEntry) entries.nextElement());
InputStream in = zf.getInputStream(entry);
String str = folderPath + File.separator + entry.getName();
str = new String(str.getBytes("8859_1"), "GB2312");
File desFile = new File(str);
if (!desFile.exists()) {
File fileParentDir = desFile.getParentFile();
if (!fileParentDir.exists()) {
fileParentDir.mkdirs();
}
desFile.createNewFile();
}
OutputStream out = new FileOutputStream(desFile);
byte buffer[] = new byte[1024];
int realLength;
while ((realLength = in.read(buffer)) > 0) {
out.write(buffer, 0, realLength);
}
in.close();
out.close();
}
}
}
posted on 2012-06-08 13:37
汪杰 阅读(686)
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