Android 往自己的APP加入文件

/** @author  xuxin
*down load tht simotun file
*/
private void loadSimotunFile(){
if(!isFileExist(mexeFilePath))
try {
InputStream in=getAssets().open("simotun") ;
saveToFile(mexeFilePath,in);
} catch (IOException e1) {
e1.printStackTrace();
}
}

/** @author  xuxin
* get inputStream,and write it to a new file
*/
public void saveToFile(String fileName, InputStream in) throws IOException {
FileOutputStream fos = null;
BufferedInputStream bis = null;
int BUFFER_SIZE = 1024;
byte[] buf = new byte[BUFFER_SIZE];
int size = 0;
bis = new BufferedInputStream(in);
fos = new FileOutputStream(fileName);
while ( (size = bis.read(buf)) != -1)
fos.write(buf, 0, size);
fos.close();
bis.close();
}