[英]Android AsyncTask can not retrieve in JSON string from php-mysql
I can show data from an array stored in 'values', but when I try to get data from database, I am getting 我可以显示存储在'values'中的数组中的数据,但是当我尝试从数据库中获取数据时,我得到了
"E/Surface: getSlotFromBufferLocked: unknown buffer" “E / Surface:getSlotFromBufferLocked:未知缓冲区”
error. 错误。 I have php script and mysql database which has a 'question' column. 我有php脚本和mysql数据库,它有一个'问题'列。 I am not sure if I have problem in connection establishment or json parse or anywhere else. 我不确定我在连接建立或json解析或其他任何地方是否有问题。
My VersionsFragment.java 我的VersionsFragment.java
public class VersionsFragment extends ListFragment {
public VersionsFragment() {
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
//String[] versionName = getResources().getStringArray(R.array.version_names); //this works fine
new MyTask().execute();
}
class MyTask extends AsyncTask<String, Integer, String[]> {
@Override
protected String[] doInBackground(String... params) {
String[] versionName = new String[0];
ArrayList<String> scripts = new ArrayList<String>();
try {
URL url = new URL("http://192.168.1.105/android/phpcall.php");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
String strJson = "";
String line;
BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));
while ((line = br.readLine()) != null) {
strJson += line;
}
//Log.d(VersionsFragment.class.getSimpleName(), line);
JSONArray jArray = new JSONArray(strJson);
for (int i = 0; i < jArray.length(); i++) {
JSONObject jObject = jArray.getJSONObject(i);
String name = jObject.getString("question");
scripts.add(name);
}
versionName = scripts.toArray(new String[scripts.size()]);
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
return versionName;
}
protected void onPostExecute(String[] result){
//for(int i=0;i<result.length;i++)
//Log.d(VersionsFragment.class.getSimpleName(), result[i]);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, result);
setListAdapter(adapter);
}
}
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
OnVersionNameSelectionChangeListener listener = (OnVersionNameSelectionChangeListener) getActivity();
listener.OnSelectionChanged(position);
}
}
Edit above code as below: 编辑上面的代码如下:
JSONObject jsonObj = new JSONObject(strJson);
// Getting JSON Array node
JSONArray jArray = jsonObj.getJSONArray(YOUR_JSON_ARRAY_NAME);
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