Intent intent = new Intent(this, FileSelectorActivity.class);
  intent.putExtra(FileSelectorActivity.ACTIVITY_KEY_MULTI, true);  //是否多选模式
  intent.putExtra(FileSelectorActivity.ACTIVITY_KEY_MAX_COUNT, 5);//限定文件选择数，默认为3
  intent.putExtra(FileSelectorActivity.ACTIVITY_KEY_FILEROOT, ""); //初始路径
  intent.putExtra(FileSelectorActivity.ACTIVITY_KEY_FILE_TYPE, ""); //筛选文件类型，数组字符串形式，例如["video","image","doc"]或[FileSelectorActivity.FILE_TYPE_IMAGE,FileSelectorActivity.FILE_TYPE_VIDEO]
//intent.putExtra(FileSelectorActivity.ACTIVITY_KEY_FILE_TYPE, FileSelectorActivity.FILE_TYPE_IMAGE);//只展示图片
  startActivityForResult(intent, 100);

    //文件类型筛选
   ArrayList<String> filters = new ArrayList<String>();
   filters.add(FileSelectorActivity.FILE_TYPE_IMAGE);//图片
   filters.add(FileSelectorActivity.FILE_TYPE_VIDEO);//视频
   filters.add(FileSelectorActivity.FILE_TYPE_DOC);//文档
   filters.add(FileSelectorActivity.FILE_TYPE_AUDIO);//音频

   FileSelector.Builder builder = new FileSelector.Builder(this);
   Intent intent = builder.setFileRoot("")//初始路径  init file root
               .setIsMultiple(true)//是否多选模式 whether is multiple select
               .setMaxCount(3)//限定文件选择数 max file count
               .setFilters(filters)//筛选文件类型  file filter
               .getIntent();
   startActivityForResult(intent, 100);

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode == Activity.RESULT_OK && requestCode == 100 && data != null) {
             ArrayList<String> pathList = data.getStringArrayListExtra(FileSelectorActivity.ACTIVITY_KEY_RESULT_PATHLIST);
             for (String path : pathList) {
                 Log.i(TAG, path);
             }
        }
    }