assets文件夹下文件目录复制到SD卡下

    private void copyDir(String path) {  

     String[] files;
     try {
     files = this.getAssets().list(path);
     if (files.length == 0) {
     copyFile(path);
     } else {
     String filePath = "mnt/sdcard" + "/" + path;
     File file = new File(filePath);
     file.mkdirs();
     for (int i = 0; i < files.length; i++) {
     String[] files2 = this.getAssets().list(path+"/"+files[i]);
     if (files2.length == 0) {
     copyFile(path + "/" + files[i]);
     } else {
     copyDir(path + "/" + files[i]);
     }
     }  

     }  

     } catch (IOException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
     }  

     }  

    private void copyFile(String path) {
     Log.v("file", path);
     InputStream in = null;
     FileOutputStream out = null;
     try {  

     String filePath = "mnt/sdcard" + "/" + path;  

     File file = new File(filePath);  

     if (!file.exists()) {
     in = this.getAssets().open(path);
     out = new FileOutputStream(file);
     int length = -1;
     byte[] buf = new byte[1024];
     while ((length = in.read(buf)) != -1) {
     out.write(buf, 0, length);
     }
     out.flush();
     in.close();
     out.close();
     }
     } catch (IOException e) {
     e.printStackTrace();
    } finally {
     try {
     if (in != null) {
     in.close();
     }
     if (out != null) {
     out.close();
     }
     } catch (IOException e) {
     e.printStackTrace();
     }
     }  

     }