拷貝資料夾的程式碼：

 public boolean copy(String file1,String file2) {
                   File in=new File(file1);
                   File out=new File(file2);
                   if(!in.exists()){
                           return false;
                   }
                   else {
                   }
                   if(!out.exists())
                           out.mkdirs();
                   File[] file=in.listFiles();
                   FileInputStream fin=null;
                   FileOutputStream fout=null;
                   for(int i=0;i<file.length;i++){
                   if(file[i].isFile()){
                           try {
                                   fin=new FileInputStream(file[i]);
                           } catch (FileNotFoundException e) {
                                   // TODO Auto-generated catch block
                                   e.printStackTrace();
                           }

                           try {
                                   File f = new File(file2+"/"+file[i].getName());
                                   fout=new FileOutputStream(f);
                           } catch (FileNotFoundException e) {
                                   // TODO Auto-generated catch block
                                   e.printStackTrace();
                           }

                           int c;
                           byte[] b=new byte[1024*5];
                           try {
                                   while((c=fin.read(b))!=-1){
                                           fout.write(b, 0, c);
                                   }
                                   fin.close();
                                   fout.flush();
                                   fout.close();
                           } catch (IOException e) {
                                   // TODO Auto-generated catch block
                                   e.printStackTrace();
                           }
   //              return true;
                   }
                   else copy(file1+"/"+file[i].getName(),file2+"/"+file[i].getName());
                   }

                   return false;

}

android上設定資料夾許可權有兩種方法

1：

  try {
                    String command = "chmod 644 " + f.getAbsolutePath();
                    Runtime runtime = Runtime.getRuntime();
                    java.lang.Process proc = runtime.exec(command);
                    } catch (IOException e) {
                       e.printStackTrace();
                    }

2：

使用FileUtils，這個類預設是隱藏的，官方sdk中不包含這個類，所以程式碼如果要使用這個類，需要將工程放到android原始碼中編譯
          FileUtils.setPermissions(f.getAbsolutePath(), FileUtils.S_IRUSR | FileUtils.S_IWUSR | FileUtils.S_IRGRP | FileUtils.S_IROTH, -1, -1) ;