小编and*_*per的帖子

我正在创建一个应用程序,其中我需要将库中的所有图像放入我的应用程序中,其中包含girdview.我希望所有文件夹中的所有图像都出现在gridview中.

String[] proj = { MediaStore.Images.Media.DATA, MediaStore.Images.Media._ID };
actualimagecursor = managedQuery(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, proj,
                      null, null, MediaStore.Images.Media.DEFAULT_SORT_ORDER);

actual_image_column_index = actualimagecursor.getColumnIndexOrThrow(MediaStore.Images.Media._ID);
actualimagecursor.moveToPosition(position);
String i = actualimagecursor.getString(actual_image_column_index);

我已将此代码添加到我的代码中,但我只获得了SD卡图像,没有获得其他文件夹图像.如何从画廊中获取所有图像？

提前致谢.

我是Android开发的新手,也是第一次使用可扩展的listview.我正在创建一个应用程序,在其中我从webservice获取d expandable listview的所有内容.我从wevservice获取所有内容,但是当可扩展listview中没有父节点的子节点时,可扩展listview的自定义适配器merhod getchildcount()返回null并给出空指针异常如何在列表中仅显示父节点没有孩子,两者都可用？

谢谢

public View getChildView(int p_id, int c_id, boolean bln1, View view,ViewGroup viewgroup) {
    // TODO Auto-generated method stub

     if (view == null) {
            view = inflater.inflate(com.example.eventlive.R.layout.homescreen_list_item_child, viewgroup,false);
        }

        TextView textView = (TextView) view.findViewById(R.id.list_item_text_child);
        //"i" is the position of the parent/group in the list and 
        //"i1" is the position of the child
        textView.setText(mParent.get(p_id).getArrayChildren().get(c_id));
        view.setBackgroundResource(R.drawable.child_bg);
        //return the entire view
        return view;
}

//counts the number of children items so the list knows how many times calls getChildView() method …

         try 
         {

            url= new URL(ConstantsClass.VENDOR_FOLLOW + "?UID=" +android_id+"&URL='"+resultfinal+"'&device=android");


                connection = (HttpURLConnection) url.openConnection();
                connection.setDoOutput(true);
                connection.setRequestMethod("POST");

                request = new OutputStreamWriter(connection.getOutputStream());
                request.flush();
                request.close();
                request.write("Hello!!!");

                String line = "";
                InputStreamReader isr = new InputStreamReader(connection.getInputStream());
                BufferedReader reader = new BufferedReader(isr);

                StringBuffer sb = new StringBuffer();

                while((line=reader.readLine())!=null) {
                    sb.append(line + "&");
                }

                response = sb.toString();
                //response.getEntity().getContent();

                Log.i("Test", "updated response: " + response);



            }
         catch (IOException e) {
              e.printStackTrace();
          }

            Log.i("Test", "**************url list********************" + url);
         tag_text.setOnClickListener(new OnClickListener() {
                public void onClick(View v) {
                    // TODO Auto-generated method …

我试图将json值解析为我的Android应用程序.在这里,我被困在一个地方,我需要在json arraylist中有对象长度.

下面是我的json:

    "events": { //json object
            "2012-11-30": [ // json array
                {
                    "privacy": "OPEN",
                    "name": "LOGDGE"   
                }
            ],
            "2013-08-17": [
                {
                    "privacy": "OPEN",
                    "name": "Party: Dinner and Dancing"
                }
            ],
            "2013-09-14": [
                {
                    "privacy": "OPEN",
                    "name": "Party: Dinner and Dancing"
                }
            ],
            "2013-09-27": [
                {
                    "privacy": "OPEN",
                    "name": "Salsa Party!"  
                }

            {
             "privacy": "OPEN",
                     "name": "Dance Performance Course",
            }       
            ],
            "2013-10-23": [
                {
                    "privacy": "OPEN",
                    "name": "Dance Performance Course"
                }
            ]
    }

现在我的问题是我如何解析以获得json数组的长度:

• 2012-11-30计数= 1
• 2013-08-17计数= 1
• 2013-09-27计数= 2 …