在我的应用中，我发布了用户的电话号码并获取了一个JSON数组作为响应，格式为[{"category" : "category", "name" : "name", "phone" : "phone", "comment" : "comment"}, etc etc ..... ]
我正在尝试在ListView中格式化此JSON数组响应但我收到此错误并且我的应用程序关闭。帮助将不胜感激。
java.lang.NullPointerException
at appname.onResponse(ListView.java:130)
at appname.onResponse(ListView.java:83)
以下是我的代码：
StringRequest stringRequest = new StringRequest(Request.Method.POST, SelectUserReviews_URL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Toast.makeText(ListView.this, response, Toast.LENGTH_LONG).show();
JsonArrayRequest movieReq = new JsonArrayRequest(SelectUserReviews_URL,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
Log.d(TAG, response.toString());
hidePDialog();
// Parsing json
for (int i = 0; i < response.length(); i++) {
try {
JSONObject obj = response.getJSONObject(i);
Review review = new Review();
review.setCategory(obj.getString("category"));
review.setName(obj.getString("name"));
review.setPhone(obj.getString("phone"));
review.setComment(obj.getString("comment"));
reviewList.add(review);
} catch (JSONException e) {
e.printStackTrace();
}
}
// notifying list adapter about data changes
// so that it renders the list view with updated data
adapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error geting user info: " + error.getMessage());
hidePDialog();
}
});
// Adding request for getting user info to request queue
AppController.getInstance().addToRequestQueue(movieReq);
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error getting user: " + error.getMessage());
hidePDialog();
}
}) {
@Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
params.put(KEY_PHONENUMBER_USER, phoneNoofUser);
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
第130行是：
AppController.getInstance().addToRequestQueue(movieReq);
第83行是：
new Response.Listener<String>() {