Question

您好我无法获取JSONObject值标题并存储到数组中。

public class ViewPagerAdapter extends PagerAdapter 
{   
// JSON Node names
     private static final String TAG_CATEGORIESLIST = "categorylist";
     private static final String TAG_TITLE = "title";
     private static final String TAG_URL = "url";
     public static String[] titles;
     public final Context context;
     public int[] scrollPosition;
     JSONArray categories = null; 
     JSONObject json;
     {
         try {
                JSONFunction JSONFunction = new JSONFunction();
               json = JSONFunction.categorylist();
               // Getting Array of Categories
               categories = json.getJSONArray(TAG_CATEGORIESLIST);
                // looping through All Categories
               for(int i = 0; i < categories.length(); i++){
                JSONObject c = categories.getJSONObject(i);
                // Storing each json item in variable
                String title = c.getString(TAG_TITLE);
                String url = c.getString(TAG_URL); 
                titles = new String[] {title}; //only obtain one result
                scrollPosition = new int[titles.length];
            }

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

我的titles只获得一个值，需要你们的帮助。
附加组件：

我正在使用Viewpagerindicator库，显示标题的默认代码就像是

private static String [] titles = new String [] {＆＃34; Page 1＆＃34;，＆＃34; Page 2＆＃34;，＆＃34; Page 3＆＃34;，＆＃34; Page 4＆＃34;，＆＃34; Page 5＆＃34;};

我正在尝试将json数据输入到那里。感谢。

Answer 1

你没有递增标题数组

更改此

 titles = new String[] {title};//Because of this your last retrived  value will be stored in titles

到

 titles[i] = title;

Answer 2

public class ViewPagerAdapter extends PagerAdapter 
{   
// JSON Node names
     private static final String TAG_CATEGORIESLIST = "categorylist";
     private static final String TAG_TITLE = "title";
     private static final String TAG_URL = "url";
     public static String[] titles;
     public final Context context;
     public int[] scrollPosition;
     JSONArray categories = null; 
     JSONObject json;
     {
         try {
                JSONFunction JSONFunction = new JSONFunction();
               json = JSONFunction.categorylist();
               // Getting Array of Categories
               categories = json.getJSONArray(TAG_CATEGORIESLIST);
                // looping through All Categories
               for(int i = 0; i < categories.length(); i++){
                JSONObject c = categories.getJSONObject(i);
                // Storing each json item in variable
                String title = c.getString(TAG_TITLE);
                String url = c.getString(TAG_URL); 

change this line in your code

////////////////////////////////////////////// < / p>

                titles[i]=title;

////////////////////////////////////////////// scrollPosition = new int [titles.length]; }

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

将JSONObject获取为字符串数组值的麻烦

2 个答案: