我在我的Android应用程序中创建了一个ListView，我正在尝试使用Volley从我的服务器中显示我的JSON数组。我知道listview设置正确，因为当我创建如下所示的凌空请求时，它在ListView中正确显示（我在PHP中设置了phoneNoofUser="0123456789"，因此没有从Android端发布变量）：
这在ListView中正确显示：
// Creating volley request obj
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"));
// adding movie to movies array
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: " + error.getMessage());
hidePDialog();
}
});
// Adding request to request queue
AppController.getInstance().addToRequestQueue(movieReq);
}
但是当我从我的应用发布phoneNoofUser时（需要这样做，因为实际上它并不总是0123456789）我的应用中没有显示任何内容。但是，JSON数组响应在Toast中正确显示。你能告诉我如何解决这个问题吗？
ListView没有在ListView中显示每个JSON对象，但是在Toast中正确显示JSON数组响应：
StringRequest stringRequest = new StringRequest(Request.Method.POST, SelectUserReviews_URL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.d(TAG, response.toString());
//toast comes up with the correct JSON array response
//but can't get the JSON array to come up in my ListView
Toast.makeText(PopulistoListView.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 getting user: " + 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);
}
答案 0 :(得分：0)
我解决了我的问题 - 在列表视图中显示我的Json对象 - 另一种方式。我已经通过stringrequest凌空调用在我的php文件中获得了一个字符串响应。所以在那个响应中，我将字符串转换为json数组，然后将json数组转换为单个对象，然后在ListView中显示它们。
这是我使用的代码：
StringRequest stringRequest = new StringRequest(Request.Method.POST, SelectUserReviews_URL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
//hide the 'loading' box
hidePDialog();
Toast.makeText(PopulistoListView.this, response, Toast.LENGTH_LONG).show();
for (int i = 0; i < response.length(); i++) {
try {
JSONArray responseObject = new JSONArray(response);
JSONObject obj = responseObject.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"));
// Toast.makeText(PopulistoListView.this, responseObject.toString(), Toast.LENGTH_LONG).show();
reviewList.add(review);
}
catch (JSONException e) {
Log.e("MYAPP", "unexpected JSON exception", e);
// Do something to recover ... or kill the app.
}
}
// notifying list adapter about data changes
// so that it renders the list view with updated data
adapter.notifyDataSetChanged();
// System.out.println("size of reviewlist " + reviewList.size());
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(PopulistoListView.this, error.toString(), Toast.LENGTH_LONG).show();
}
}) {
@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);
}