Android 返回截击onRsponse外的修改arrayList
我需要在volley onResponse方法之外访问此arrayList。但它正在返回IndexOutOfBoundsException。Android 返回截击onRsponse外的修改arrayList,android,arraylist,android-volley,Android,Arraylist,Android Volley,我需要在volley onResponse方法之外访问此arrayList。但它正在返回IndexOutOfBoundsException。 public ArrayList<QuestionAnswer> arrayList; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); arr
public ArrayList<QuestionAnswer> arrayList;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
arrayList = new ArrayList<>();
JsonObjectRequest request = new JsonObjectRequest(Request.Method.POST, getTalkById, new JSONObject(params),
new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
JSONObject data = response.optJSONObject("data");
JSONArray highSchoolQuesAns = data.optJSONArray("questions").optJSONObject(0).optJSONArray("answers");
for (int i = 0; i < highSchoolQuesAns.length(); i++) {
String question = highSchoolQuesAns.optJSONObject(i).optString("question");
String answer = highSchoolQuesAns.optJSONObject(i).optString("answer");
arrayList.add(new QuestionAnswer(question, answer));
// adding new QuestionAnswer
}
Log.v("test",arrayList.get(0).question); // value is available here inside on response. And getting question of first arrayList element.
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d("Error", "Error: " + error.getMessage());
}
}
);
request.setRetryPolicy(new DefaultRetryPolicy(
VolleyApplication.TIMEOUT,
DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
VolleyApplication.getInstance().getRequestQueue().add(request);
Log.v("test",arrayList.get(0).question); //java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
//This is where the issue is. AND I REALLY NEED TO access this arraylist outside of volley onResponse method
}
公共ArrayList ArrayList;
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
arrayList=新的arrayList();
JsonObjectRequest=newJSONObjectRequest(request.Method.POST、getTalkById、newJSONObject(params),
新的Response.Listener(){
@凌驾
公共void onResponse(JSONObject响应){
JSONObject data=response.optJSONObject(“数据”);
JSONArray Highschool Quesans=data.optJSONArray(“问题”).optJSONObject(0).optJSONArray(“答案”);
对于(int i=0;i
正如您所见,我正在尝试登录两个地方。来自onResponse的日志确实返回了一些内容,但在onResponse之外,它只会给出IndexOutOfBoundException。我做了很多调试,并意识到onResponse arrayList的外部是空的(我正在尝试访问一个不存在的空元素)。在onResponse内部修改的ArrayList在外部无法访问。即使它是一个全局/类级别的变量我建议您在成功响应截击后使用单独的方法,如下所示
public ArrayList<QuestionAnswer> arrayList;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
arrayList = new ArrayList<>();
JsonObjectRequest request = new JsonObjectRequest(Request.Method.POST, getTalkById, new JSONObject(params),
new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
JSONObject data = response.optJSONObject("data");
JSONArray highSchoolQuesAns = data.optJSONArray("questions").optJSONObject(0).optJSONArray("answers");
for (int i = 0; i < highSchoolQuesAns.length(); i++) {
String question = highSchoolQuesAns.optJSONObject(i).optString("question");
String answer = highSchoolQuesAns.optJSONObject(i).optString("answer");
arrayList.add(new QuestionAnswer(question, answer));
// adding new QuestionAnswer
}
GetArrayValue();
Log.v("test",arrayList.get(0).question); // value is available here inside on response. And getting question of first arrayList element.
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d("Error", "Error: " + error.getMessage());
}
}
);
request.setRetryPolicy(new DefaultRetryPolicy(
VolleyApplication.TIMEOUT,
DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
VolleyApplication.getInstance().getRequestQueue().add(request);
}
private void GetArrayValue(){
Log.v("test",arrayList.get(0).question);
}
公共ArrayList ArrayList;
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
arrayList=新的arrayList();
JsonObjectRequest=newJSONObjectRequest(request.Method.POST、getTalkById、newJSONObject(params),
新的Response.Listener(){
@凌驾
公共void onResponse(JSONObject响应){
JSONObject data=response.optJSONObject(“数据”);
JSONArray Highschool Quesans=data.optJSONArray(“问题”).optJSONObject(0).optJSONArray(“答案”);
对于(int i=0;i
我建议您在截击成功后使用单独的方法,如下所示
public ArrayList<QuestionAnswer> arrayList;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
arrayList = new ArrayList<>();
JsonObjectRequest request = new JsonObjectRequest(Request.Method.POST, getTalkById, new JSONObject(params),
new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
JSONObject data = response.optJSONObject("data");
JSONArray highSchoolQuesAns = data.optJSONArray("questions").optJSONObject(0).optJSONArray("answers");
for (int i = 0; i < highSchoolQuesAns.length(); i++) {
String question = highSchoolQuesAns.optJSONObject(i).optString("question");
String answer = highSchoolQuesAns.optJSONObject(i).optString("answer");
arrayList.add(new QuestionAnswer(question, answer));
// adding new QuestionAnswer
}
GetArrayValue();
Log.v("test",arrayList.get(0).question); // value is available here inside on response. And getting question of first arrayList element.
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d("Error", "Error: " + error.getMessage());
}
}
);
request.setRetryPolicy(new DefaultRetryPolicy(
VolleyApplication.TIMEOUT,
DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
VolleyApplication.getInstance().getRequestQueue().add(request);
}
private void GetArrayValue(){
Log.v("test",arrayList.get(0).question);
}
公共ArrayList ArrayList;
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
arrayList=新的arrayList();
JsonObjectRequest=newJSONObjectRequest(request.Method.POST、getTalkById、newJSONObject(params),
新的Response.Listener(){
@凌驾
公共响应(JSO)