[英]loading json array with volley library
我有一个片段,首先从JSON数组中的Web API获取一些数据,然后提取数组中的内容。 然后,我将这两个数组( names
, img_url
)提供给自定义网格视图以显示给用户。 但是,我使用volley库获取的JSON数组不起作用。 这是我的代码:
public class selectCategouryFragment extends Fragment {
public selectCategouryFragment() {
}
private ProgressDialog pDialog;
String[] names = { "amir", "imani" };
String[] imgURL = { "asdasd", "asd sad" };
List<Item> items = null;
CustomGrid gridAdapter;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_select_categoury,
container, false);
pDialog = new ProgressDialog(getActivity());
// Showing progress dialog before making http request
pDialog.setMessage("Loading...");
pDialog.show();
String url = "http://api.androidhive.info/json/movies.json";
JsonArrayRequest Jreq = new JsonArrayRequest(url,
new Response.Listener<JSONArray>() {
public void onResponse(JSONArray jsonArry) {
for (int i = 0; i < jsonArry.length(); i++) {
JSONObject obj = null;
hidePDialog();
try {
obj = jsonArry.getJSONObject(i);
} catch (JSONException e1) {
Log.d("json", "error in taking json obj");
}
try {
names[i] = obj.getString("title");
imgURL[i] = obj.getString("image");
Log.d("get", obj.getString("title"));
} catch (JSONException e) {
Log.d("json", "error in taking json obj value ");
}
}
gridAdapter = new CustomGrid(getActivity(), names,
imgURL);
}
}, new Response.ErrorListener() {
public void onErrorResponse(VolleyError arg0) {
}
});
AppController.getInstance().addToRequestQueue(Jreq);
GridView grid = (GridView) rootView
.findViewById(R.id.selectcat_gridView);
grid.setAdapter(gridAdapter);
grid.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
gotItemsFragment(names[position]);
}
});
return rootView;
}
private void hidePDialog() {
if (pDialog != null) {
pDialog.dismiss();
pDialog = null;
}
}
private void gotItemsFragment(String m) {
Fragment cardFragment = new CategouryItems(m);
FragmentManager FM = getFragmentManager();
FM.beginTransaction().replace(R.id.frame_container, cardFragment)
.commit();
}
}
长时间显示进度对话框后,它崩溃并在log cat中显示此错误:
02-01 07:37:17.342: E/AndroidRuntime(1282): FATAL EXCEPTION: main
02-01 07:37:17.342: E/AndroidRuntime(1282): Process: com.plusnet.tashrifat, PID: 1282
02-01 07:37:17.342: E/AndroidRuntime(1282): java.lang.ArrayIndexOutOfBoundsException: length=2; index=2
02-01 07:37:17.342: E/AndroidRuntime(1282): at plusnet.tashrifat.selectCategouryFragment$1.onResponse(selectCategouryFragment.java:69)
02-01 07:37:17.342: E/AndroidRuntime(1282): at plusnet.tashrifat.selectCategouryFragment$1.onResponse(selectCategouryFragment.java:1)
02-01 07:37:17.342: E/AndroidRuntime(1282): at com.android.volley.toolbox.JsonRequest.deliverResponse(JsonRequest.java:65)
02-01 07:37:17.342: E/AndroidRuntime(1282): at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:99)
02-01 07:37:17.342: E/AndroidRuntime(1282): at android.os.Handler.handleCallback(Handler.java:733)
02-01 07:37:17.342: E/AndroidRuntime(1282): at android.os.Handler.dispatchMessage(Handler.java:95)
02-01 07:37:17.342: E/AndroidRuntime(1282): at android.os.Looper.loop(Looper.java:136)
02-01 07:37:17.342: E/AndroidRuntime(1282): at android.app.ActivityThread.main(ActivityThread.java:5017)
02-01 07:37:17.342: E/AndroidRuntime(1282): at java.lang.reflect.Method.invokeNative(Native Method)
02-01 07:37:17.342: E/AndroidRuntime(1282): at java.lang.reflect.Method.invoke(Method.java:515)
02-01 07:37:17.342: E/AndroidRuntime(1282): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
02-01 07:37:17.342: E/AndroidRuntime(1282): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
02-01 07:37:17.342: E/AndroidRuntime(1282): at dalvik.system.NativeStart.main(Native Method)
您已经初始化
String[] names = { "amir", "imani" };
String[] imgURL = { "asdasd", "asd sad" };
它看起来jsonArry.length()> 2
所以您需要做的就是将这些更改为:
String[] names = null;
String[] imgURL = null;
并在onResponse()中: for loop
之前
names = new String[jsonArry.length()];
imgURL = new String[jsonArry.length()];
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