在我的代码中，我需要使用JSON在文本视图中显示普通文本。我正在使用volley库来解析JSON。我的代码是
public class PrincipalSpeechFragment extends Fragment implements OnClickListener {
public PrincipalSpeechFragment(){}
private String urlJsonArry = "http://imaginetventures.net/sample/everwin_vidhyashram/webservice/rest/?module=speech&from=1-9-2014&to=30-9-2014";
private static String TAG = PrincipalSpeechFragment.class.getSimpleName();
// JSON Node names
private static final String TAG_PRINCIPAL_SPEECH ="Principal Speech";
private static final String TAG_SPEECH= "speech";
private static final String TAG_DESC = "desc";
String tag_json_obj = "json_obj_req";
private Button getPrincipalSpeech;
// Progress dialog
//private ProgressDialog pDialog;
private TextView txtResponse;
// temporary string to show the parsed response
private String jsonResponse;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_principal_speech, container, false);
return rootView;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onActivityCreated(savedInstanceState);
getPrincipalSpeech = (Button) getActivity().findViewById(R.id.idForPrinciSpeech);
txtResponse = (TextView) getActivity().findViewById(R.id.txtResponse);
getPrincipalSpeech.setOnClickListener(this);
}
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
makeJsonArrayRequest();
}
private void makeJsonArrayRequest() {
JsonArrayRequest req = new JsonArrayRequest(urlJsonArry,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
Log.d(TAG, response.toString());
try {
// Parsing json array response
// loop through each json object
jsonResponse = "";
for (int i = 0; i < response.length(); i++) {
JSONObject speechobj = (JSONObject) response
.get(i);
/*String speech = speechobj.getString("speech");
String email = speech.getString("email");
JSONObject phone = speech
.getJSONObject("speech");
String home = phone.getString("home");
String mobile = phone.getString("mobile");*/
/*jsonResponse += "Speech: " + speech + "\n\n";
/*jsonResponse += "Email: " + email + "\n\n";*/
/*jsonResponse += "Home: " + home + "\n\n";
jsonResponse += "Mobile: " + mobile + "\n\n\n";*/
}
txtResponse.setText(jsonResponse);
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(getActivity().getApplicationContext(),
"Error: " + e.getMessage(),
Toast.LENGTH_LONG).show();
}
//hidepDialog();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
Toast.makeText(getActivity().getApplicationContext(),
error.getMessage(), Toast.LENGTH_SHORT).show();
//hidepDialog();
}
});
// Adding request to request queue
AppController.getInstance().addToRequestQueue(req);
}
}
当我点击按钮获取结果时，它只显示＆＃34; org.json.JSON.EXCEPTION。和值：-------- Json对象无法转换为jsonarray＆＃34;
我不知道自己犯了什么错误。我只是在吐司中得到这些错误。 请告诉我。
答案 0 :(得分：0)
private String urlJsonArry = "http://imaginetventures.net/sample/everwin_vidhyashram/webservice/rest/?module=speech&from=1-9-2014&to=30-9-2014";
您正在对代码中所述的网址发出请求，如果我将其粘贴到浏览器中：
响应：
{
"Principal Speech": [
{
"speech": "Lorem (... et cetera)."
}
]
}
这是JSONObject，而不是JSONArray。因此，您可以将代码中的JSONArray设为JSONObject，然后提取您可能需要的JSONArray：jsonObject.getJSONArray("Principal Speech");
编辑：添加代码
private void makeJSONObjectRequest() {
JsonObjectRequest req = new JsonObjectRequest(urlJsonArry, //Dont know where that came from, but JsonArrayRequest as classname will probably still work. Custom/your own class, I guess. As long as the type JSONArray is changed to JSONObject
new Response.Listener<JSONObject>() { //JSONObject instead of JSONArray
@Override
public void onResponse(JSONObject response) {//JSONObject instead of JSONArray
JSONArray speechArray = response.getJSONArray("Principal Speech"); //get the array from the JSONObject
Log.d(TAG, response.toString());
// The rest is the same
try {
// Parsing json array response
// loop through each json object
jsonResponse = "";
for (int i = 0; i < response.length(); i++) {
JSONObject speechobj = (JSONObject) response
.get(i);
/*String speech = speechobj.getString("speech");
String email = speech.getString("email");
JSONObject phone = speech
.getJSONObject("speech");
String home = phone.getString("home");
String mobile = phone.getString("mobile");*/
/*jsonResponse += "Speech: " + speech + "\n\n";
/*jsonResponse += "Email: " + email + "\n\n";*/
/*jsonResponse += "Home: " + home + "\n\n";
jsonResponse += "Mobile: " + mobile + "\n\n\n";*/
}
txtResponse.setText(jsonResponse);
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(getActivity().getApplicationContext(),
"Error: " + e.getMessage(),
Toast.LENGTH_LONG).show();
}
//hidepDialog();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
Toast.makeText(getActivity().getApplicationContext(),
error.getMessage(), Toast.LENGTH_SHORT).show();
//hidepDialog();
}
});
// Adding request to request queue
AppController.getInstance().addToRequestQueue(req);
}
EDIT2：重写：
所以JsonArrayObjectRequest与JsonObjectRequest
略有不同JSONArrayRequest
public JsonArrayRequest(String url, Listener<JSONArray> listener, ErrorListener errorListener) {
super(Method.GET, url, null, listener, errorListener);
}
JsonObjectRequest只有一个构造函数，你在super调用中看到5个参数（还有一个有4个参数，但仍然超过jsonarrayrequest中的3个）
所以我们必须改变一下
private void makeJSONObjectRequest() {
Response.Listener<JSONObject> oklistener = new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
JSONArray speechArray = response.getJSONArray("Principal Speech");
Log.d(TAG, response.toString());
// The rest is the same
try {
// Parsing json array response
// loop through each json object
jsonResponse = "";
for (int i = 0; i < speechArray.length(); i++) {
JSONObject speechobj = (JSONObject) speechArray.get(i);
/*String speech = speechobj.getString("speech");
String email = speech.getString("email");
JSONObject phone = speech
.getJSONObject("speech");
String home = phone.getString("home");
String mobile = phone.getString("mobile");*/
/*jsonResponse += "Speech: " + speech + "\n\n";
/*jsonResponse += "Email: " + email + "\n\n";*/
/*jsonResponse += "Home: " + home + "\n\n";
jsonResponse += "Mobile: " + mobile + "\n\n\n";*/
}
txtResponse.setText(jsonResponse);
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(getActivity().getApplicationContext(),
"Error: " + e.getMessage(),
Toast.LENGTH_LONG).show();
}
//hidepDialog();
}
};
Response.ErrorListener errorlistener = new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
Toast.makeText(getActivity().getApplicationContext(),
error.getMessage(), Toast.LENGTH_SHORT).show();
//hidepDialog();
}
};
//Above instantiated the listeners, to make it a little more understandable. Here the second param => null. That sets the method to GET
JsonObjectRequest req = new JsonObjectRequest(urlJsonArry, null, oklistener, errorlistener);
// Adding request to request queue
AppController.getInstance().addToRequestQueue(req);
}
答案 1 :(得分：0)
在您的回复中，您获得了JSONObject，因此请使用下面的代码。
JSONObject jsnobject = new JSONObject(response);
之后
JSONArray jsonArray = jsnobject.getJSONArray("Principal Speech");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject explrObject = jsonArray.getJSONObject(i);
}
答案 2 :(得分：0)
Response.Listener<JSONArray> listener = new Response.Listener<JSONArray>()
{
@Override
public void onResponse(JSONArray response) {
// TODO Auto-generated method stub
}
};
Response.ErrorListener errorListener = new Response.ErrorListener()
{
@Override
public void onErrorResponse(VolleyError error) {
// TODO Auto-generated method stub
}
};
并使用
JsonArrayRequest jr =new JsonArrayRequest(Request.Method.GET,url, listener, errorListener) ;
编辑2：
我查看来源，看起来如下
public JsonArrayRequest(String url, Listener<JSONArray> listener, ErrorListener errorListener) {
super(Method.GET, url, null, listener, errorListener);
}