我无法使用Volley Library在ListView中显示JSON数据。
费用等级
public class Fee extends Fragment /*implements View.OnClickListener */ {
LinearLayout receipt1, receipt2, receipt3, receipt4;
LinearLayout receipt1detail, receipt2detail, receipt3detail, receipt4detail;
TextView statustextView;
ListView listView;
List<StudentFeeInformation> yourData = new ArrayList<StudentFeeInformation>();
public static final String Navigation_URL = "http://192.168.100.5:84/Api/financeApi/getAllFees";
// public static final String Navigation_URL = "http://192.168.100.5:84/Api/financeApi/getAllFees?ID=111";
String master_id;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.student_fees_listview, container, false);
setHasOptionsMenu(true);
// receipt1 = (LinearLayout) view.findViewById(R.id.linear_receipt1_fee);
// receipt2 = (LinearLayout) view.findViewById(R.id.linear_receipt2_fee);
// receipt3 = (LinearLayout) view.findViewById(R.id.linear_receipt3_fee);
// receipt4 = (LinearLayout) view.findViewById(R.id.linear_receipt4_fee);
// receipt1detail = (LinearLayout) view.findViewById(R.id.receipt1_fee);
// receipt2detail = (LinearLayout) view.findViewById(R.id.receipt2_fee);
// receipt3detail = (LinearLayout) view.findViewById(R.id.receipt3_fee);
// receipt4detail = (LinearLayout) view.findViewById(R.id.receipt4_fee);
// receipt1.setOnClickListener(this);
// receipt2.setOnClickListener(this);
// receipt3.setOnClickListener(this);
// receipt4.setOnClickListener(this);
// receipt1detail.setVisibility(View.VISIBLE);
// receipt2detail.setVisibility(View.GONE);
// receipt3detail.setVisibility(View.GONE);
// receipt4detail.setVisibility(View.GONE);
statustextView = (TextView) view.findViewById(R.id.student_profile_fee_status);
SessionManagement sessionManagement = new SessionManagement(getContext());
master_id = sessionManagement.getMasterId();
listView = (ListView) view.findViewById(R.id.list_student_fees);
CustomFeeListStudentAdapter customFeeListStudentAdapter = new CustomFeeListStudentAdapter(getContext(), R.layout.fragment_fee, yourData);
listView.setAdapter(customFeeListStudentAdapter);
getUsersListData();
return view;
}
StudentFeeInformation studentFeeInformation;
private void getUsersListData() {
String URL = Navigation_URL + "?id=" + master_id;
StringRequest stringRequest = new StringRequest(Request.Method.GET, URL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONArray jArray = new JSONArray(response);
studentFeeInformation = new StudentFeeInformation();
for (int i = 0; i < jArray.length(); i++) {
JSONObject jsonObject = jArray.getJSONObject(i);
studentFeeInformation.Status = jsonObject.getString("Status");
System.out.println("This is Good");
System.out.print(studentFeeInformation.Status);
}
} catch (JSONException e) {
System.out.println("This is not good");
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
// Toast.makeText(view.Fee.this, error.toString(), Toast.LENGTH_LONG).show();
}
}) {
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String, String> headers = new HashMap<String, String>();
return headers;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(getContext());
requestQueue.add(stringRequest);
}
}
StudentFeeInformation
public class StudentFeeInformation implements Serializable {
public String Status;
public String getStatus() {
return Status;
}
public void setStatus(String status) {
Status = status;
}
}
CustomFeeListStudentAdapter
public class CustomFeeListStudentAdapter extends ArrayAdapter<StudentFeeInformation> {
private List<StudentFeeInformation> items;
public CustomFeeListStudentAdapter(Context context, int resource) {
super(context, resource);
}
public CustomFeeListStudentAdapter(Context context, int resource, List<StudentFeeInformation> items) {
super(context, resource, items);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
TextView tt = null;
if (v == null) {
LayoutInflater vi;
vi = LayoutInflater.from(getContext());
v = vi.inflate(R.layout.fragment_fee, null);
tt = (TextView) v.findViewById(R.id.student_profile_fee_status);
}
StudentFeeInformation p = items.get(position);
if (p != null) {
if (tt != null) {
tt.setText("" + p.getStatus());
}
}
return v;
}
}
student_fees_listview
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#2E353D"
android:orientation="vertical">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="40dp"
android:layout_gravity="center_horizontal"
android:orientation="horizontal">
<ImageView
android:layout_width="30dp"
android:layout_height="match_parent"
android:padding="3dp"
android:src="@mipmap/fee" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_marginLeft="8dp"
android:text="Fees"
android:textColor="#fff"
android:textSize="17dp"
android:textStyle="bold" />
</LinearLayout>
</LinearLayout>
<ListView
android:id="@+id/list_student_fees"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>
fragment_fee
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#DCE2E8"
android:orientation="horizontal"
android:padding="5dp">
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:paddingLeft="70dp"
android:text="Status"
android:textSize="10dp"
android:textStyle="bold" />
<TextView
android:id="@+id/student_profile_fee_status"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:paddingLeft="70dp"
android:text="Paid"
android:textColor="#108B89"
android:textSize="10dp"
android:textStyle="bold" />
</LinearLayout>
JSON
[
{
"MasterID": "E0017",
"StdID": 111,
"Status": "P",
"AmountPaid": 6645,
"Class": 8,
"DateOfReciept": "2017-01-01T00:00:00",
"Description": "[{\"des\":\"Admission\",\"Amount\":300},{\"des\":\"Monthly Fee\",\"Amount\":5400},{\"des\":\"Exam Fee\",\"Amount\":200},{\"des\":\"Extra Charge\",\"Amount\":400},{\"des\":\"Late Charge\",\"Amount\":345}]",
"RecieptNo": 1011,
"NAME": "Uzumaki Naruto",
"recivedDate": "2017-03-10T00:00:00",
"reciever": "Cynthia Irwin"
},
{
"MasterID": "E0017",
"StdID": 111,
"Status": "U",
"AmountPaid": 5600,
"Class": 8,
"DateOfReciept": "2017-03-01T00:00:00",
"Description": "[{\"des\":\"Exam Fee\",\"Amount\":200},{\"des\":\"Monthly Fee\",\"Amount\":5400}]",
"RecieptNo": 1012,
"NAME": "Uzumaki Naruto",
"recivedDate": "2017-03-06T00:00:00",
"reciever": "Cynthia Irwin"
}
]
如何使用JSON数据填充listView？请告诉我 我做错了。
答案 0 :(得分：1)
似乎您错过了将studentFeeInformation添加到yourData列表中。在studentFeeInformation中添加创建的getUsersListData()，在完成for循环后，调用适配器的notifyDataSetChanged()。
答案 1 :(得分：1)
费用等级
public class Fee extends Fragment /*implements View.OnClickListener */ {
LinearLayout receipt1, receipt2, receipt3, receipt4;
LinearLayout receipt1detail, receipt2detail, receipt3detail, receipt4detail;
TextView statustextView;
ListView listView;
List<StudentFeeInformation> yourData = new ArrayList<StudentFeeInformation>();
public static final String Navigation_URL = "http://192.168.100.5:84/Api/financeApi/getAllFees";
// public static final String Navigation_URL = "http://192.168.100.5:84/Api/financeApi/getAllFees?ID=111";
String master_id;
StudentFeeInformation studentFeeInformation;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.student_fees_listview, container, false);
setHasOptionsMenu(true);
statustextView = (TextView) view.findViewById(R.id.student_profile_fee_status);
SessionManagement sessionManagement = new SessionManagement(getContext());
master_id = sessionManagement.getMasterId();
listView = (ListView) view.findViewById(R.id.list_student_fees);
//CustomFeeListStudentAdapter customFeeListStudentAdapter = new CustomFeeListStudentAdapter(getContext(), R.layout.fragment_fee, yourData);
//listView.setAdapter(customFeeListStudentAdapter);
getUsersListData();
return view;
}
private void getUsersListData() {
String URL = Navigation_URL + "?id=" + master_id;
StringRequest stringRequest = new StringRequest(Request.Method.GET, URL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
ArrayList<StudentFeeInformation> student_list=new ArrayList<>();
JSONArray jArray = new JSONArray(response);
for (int i = 0; i < jArray.length(); i++) {
JSONObject jsonObject = jArray.getJSONObject(i);
String status = jsonObject.getString("Status");
System.out.println("status:"+status);
student_list.add(new StudentFeeInformation(status));
}
System.out.println("student_list size:"+student_list.size());
CustomFeeListStudentAdapter customFeeListStudentAdapter = new CustomFeeListStudentAdapter(getActivity(), student_list);
listView.setAdapter(customFeeListStudentAdapter);
} catch (JSONException e) {
System.out.println("This is not good");
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
// Toast.makeText(view.Fee.this, error.toString(), Toast.LENGTH_LONG).show();
}
}) {
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String, String> headers = new HashMap<String, String>();
return headers;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(getContext());
requestQueue.add(stringRequest);
}
}
StudentFeeInformation模型类：
public class StudentFeeInformation implements Serializable {
public String Status;
public StudentFeeInformation(String status) {
Status = status;
}
public String getStatus() {
return Status;
}
public void setStatus(String status) {
Status = status;
}
}
CustomFeeListStudentAdapter：
public class CustomFeeListStudentAdapter extends BaseAdapter {
Context mContext;
ArrayList<StudentFeeInformation>student_list;
String TAG="HomeTab_adapter";
public CustomFeeListStudentAdapter(Context mContext, ArrayList<StudentFeeInformation> student_list) {
super();
this.mContext = mContext;
this.student_list=student_list;
}
@Override
public int getCount() {
return student_list.size();
}
@Override
public Object getItem(int arg0) {
return arg0;
}
@Override
public long getItemId(int arg0) {
return arg0;
}
@Override
public View getView(final int postion, View convertView, ViewGroup parent)
{
final Holder viewHolder;
if(convertView==null)
{
// inflate the layout
LayoutInflater inflater=(LayoutInflater)mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView=inflater.inflate(R.layout.R.layout.fragment_fee, parent, false);
// well set up the ViewHolder
viewHolder = new Holder();
viewHolder.student_profile_fee_status = (TextView)convertView.findViewById(R.id.student_profile_fee_status);
}
else{
// we've just avoided calling findViewById() on resource everytime
// just use the viewHolder
viewHolder = (Holder) convertView.getTag();
}
viewHolder.student_profile_fee_status.setText(student_list.get(postion).getStatus());
convertView.setTag(viewHolder);
return convertView;
}
class Holder{
TextView student_profile_fee_status;
}
}