嗨,我无法从我的PHP的Json输出中解析单个json元素。
我的Json输出看起来像这样。

 {"success":1,"question":[{"question":"Question2"}]}


我的代码是

try {
    // Checking for SUCCESS TAG
    int success = json.getInt(TAG_SUCCESS);

    if (success == 1)
    {
        Questions = json.getJSONArray(TAG_Questions);
        Log.d("users_list.length() : ", String.valueOf( Questions.length()));

        for (int i = 0; i <  Questions.length(); i++)
        {
            JSONObject c = Questions.getJSONObject(i);
            Quensstring[i] =  c.getString("question" + i);
            System.out.println("Exception : " + Quensstring[i]);
        }
    } else {
        // no products found
        // Launch Add New product Activity
        Intent i = new Intent(getApplicationContext(), day1q1.class);
        // Closing all previous activities
        i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        startActivity(i);
    }
} catch (JSONException e) {
    e.printStackTrace();
}

return null;


protected void onPostExecute(String file_url)
{
    dialog.dismiss();
    runOnUiThread(new Runnable()
    {
        public void run()
        {
            System.out.println("usersMap.get(User1) : " + Quensstring[0]);
            Question.setText(Quensstring[0]);
        }
    });


请帮助我,我找不到错误。
这是我的日志

09-13 05:46:08.459: D/All :(1353): {"success":1,"question":[{"question":"Question2"}]}
09-13 05:46:08.459: D/users_list.length() :(1353): 1
09-13 05:46:08.499: W/System.err(1353): org.json.JSONException: No value for question0
09-13 05:46:08.499: W/System.err(1353):     at org.json.JSONObject.get(JSONObject.java:354)
09-13 05:46:08.539: W/System.err(1353):     at org.json.JSONObject.getString(JSONObject.java:510)
09-13 05:46:08.589: W/System.err(1353):     at com.example.newairways.day1q1$Question.doInBackground(day1q1.java:474)
09-13 05:46:08.589: W/System.err(1353):     at com.example.newairways.day1q1$Question.doInBackground(day1q1.java:1)
09-13 05:46:08.589: W/System.err(1353):     at android.os.AsyncTask$2.call(AsyncTask.java:264)
09-13 05:46:08.589: W/System.err(1353):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
09-13 05:46:08.589: W/System.err(1353):     at java.util.concurrent.FutureTask.run(FutureTask.java:137)
09-13 05:46:08.589: W/System.err(1353):     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
09-13 05:46:08.599: W/System.err(1353):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
09-13 05:46:08.599: W/System.err(1353):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
09-13 05:46:08.626: W/System.err(1353):     at java.lang.Thread.run(Thread.java:856)
09-13 05:46:08.649: I/System.out(1353): usersMap.get(User1) : null

最佳答案

{“成功”:1,“问题”:[{“问题”:“问题2”}]}}。您的JSONArray只有一个JSONObject,而该JSONObject只有1个标记是“ question”。因此,替换您的代码

Quensstring[i] =  c.getString("question" + i);




String quensString =  c.getString("question");


希望这能解决问题。

关于android - android无法解析单个json元素,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/18781622/

10-10 13:36