JSON数据未正确显示在MP Android图表中？
我能够解析JSON数据并在日志中显示信息，但数据在图形中没有正确显示。我添加了要显示的标签，但不幸的是标签也没有显示 仪表板JSON数据未正确显示在MP Android图表中？,android,json,mpandroidchart,Android,Json,Mpandroidchart,我能够解析JSON数据并在日志中显示信息，但数据在图形中没有正确显示。我添加了要显示的标签，但不幸的是标签也没有显示 仪表板 public class Dashboard extends Fragment { ListView listViewNotice, listviewpendingbills; String Navigation_URL = "http://192.168.100.5:84/api/academics/getNotices"; String Na
public class Dashboard extends Fragment {
ListView listViewNotice, listviewpendingbills;
String Navigation_URL = "http://192.168.100.5:84/api/academics/getNotices";
String Navigation_URL_BIlls = "http://192.168.100.5:84/Api/financeApi/getAllFees";
String Navigation_URL_CHART = "http://192.168.100.5:84/api/academics/getSingleStudentsMarks";
String access_token;
String Notice, BillNumber, Status, AmountPaid, ReceiptIssueDate;
String master_id;
TextView pendingbills, NoNotice;
BarChart lineChart;
LineChart chart;
private static final String TAG = "Test";
ArrayList<Entry> entries;
ArrayList<String> labels;
LineDataSet set;
LineData data;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_dashboard, container, false);
// getActivity().setTitle("St. Xavier's High School");
setHasOptionsMenu(true);
listViewNotice = (ListView) view.findViewById(R.id.list_student_notice_dashboard);
listviewpendingbills = (ListView) view.findViewById(R.id.student_dashboard_pendingbills);
pendingbills = (TextView) view.findViewById(R.id.textpendingbills);
NoNotice = (TextView) view.findViewById(R.id.textnoticedashboard);
// lineChart = (BarChart) view.findViewById(R.id.chart1);
chart = (LineChart) view.findViewById(R.id.chart1);
SessionManagement session = new SessionManagement(getContext());
session.checkLogin();
access_token = session.getAccesstToken();
master_id = session.getMasterId();
makeJsonObjectRequest();
makeJsonObjectRequestBills();
makeJsonObjectRequestGraph();
entries = new ArrayList<Entry>();
// set = new LineDataSet(entries, "Valuesl");
// data = new LineData(set);
entries.add(new Entry(0f, 30f));
entries.add(new Entry(1f, 80f));
entries.add(new Entry(2f, 36f));
entries.add(new Entry(3f, 40f));
entries.add(new Entry(23.00f, 0));
entries.add(new Entry(40.00f, 1));
// entries.add(new Entry(00.00f, 2)); // want to skip this index 2(Mar)
// entries.add(new Entry(00.00f, 3)); // want to skip this index 3 (Apr)
entries.add(new Entry(94.00f, 4));
entries.add(new Entry(20.00f, 5));
// entries.add(new Entry(4f, 0));
//entries.add(new Entry(8f, 1));
//entries.add(new Entry(6f, 2));
//entries.add(new Entry(2f, 3));
//entries.add(new Entry(18f, 4));
//entries.add(new Entry(9f, 5));
// chart.invalidate();
labels = new ArrayList<>();
labels = new ArrayList<>();
labels.add("Nepali");
labels.add("English");
labels.add("Math");
labels.add("Science");
// Collections.sort(entries, new EntryXComparator());
return view;
}
private void makeJsonObjectRequestGraph() {
RequestQueue requestQueue = Volley.newRequestQueue(getContext());
String URL1 = Navigation_URL_CHART + "?StdID=" + master_id;
StringRequest stringRequest = new StringRequest(Request.Method.GET, URL1,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONArray jArray = new JSONArray(response);
for (int i = 0; i < jArray.length(); i++) {
JSONObject jsonObject = jArray.getJSONObject(i);
String Marks = jsonObject.getString("Marks");
String examDescription = jsonObject.getString("examDescription");
if (examDescription.equals("First Term")) {
entries.add(new BarEntry(Float.parseFloat(Marks), i));
System.out.println(new BarEntry(Float.parseFloat(Marks), i));
// chart.getXAxis().setValueFormatter(new IndexAxisValueFormatter(labels));
}
}
set = new LineDataSet(entries, "");
data = new LineData(set);
chart.setData(data);
chart.notifyDataSetChanged();
chart.invalidate();
set.setColor(Color.RED);
Collections.sort(entries, new EntryXComparator());
} catch (JSONException e) {
Toast.makeText(getContext(), "Fetch failed!", Toast.LENGTH_SHORT).show();
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getContext(), error.toString(), LENGTH_LONG).show();
}
}) {
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String, String> headers = new HashMap<String, String>();
headers.put("Authorization", "Bearer " + access_token);
headers.put("Content-Type", "application/x-www-form-urlencoded");
return headers;
}
/*
@Override
protected Map<String, String> getParams() throws com.android.volley.AuthFailureError {
Map<String, String> map = new HashMap<String, String>();
map.put("id", master_id);
map.put("accessID", accessID);
map.put("currentUser", master_id);
return map;
} */
};
requestQueue.add(stringRequest);
}
}
更改x轴和Y轴的值。标记将根据您的要求绘制
private void makeJsonObjectRequestGraph() {
RequestQueue requestQueue = Volley.newRequestQueue(getContext());
String URL1 = Navigation_URL_CHART + "?StdID=" + master_id;
StringRequest stringRequest = new StringRequest(Request.Method.GET, URL1,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONArray jArray = new JSONArray(response);
for (int i = 0; i < jArray.length(); i++) {
JSONObject jsonObject = jArray.getJSONObject(i);
String Marks = jsonObject.getString("Marks");
String examDescription = jsonObject.getString("examDescription");
if (examDescription.equals("First Term ")) {
entries.add(new BarEntry(i, Float.parseFloat(Marks)));
System.out.println(new BarEntry(i, Float.parseFloat(Marks)));
}
}
set = new LineDataSet(entries, "Wow");
data = new LineData(set);
chart.setData(data);
chart.notifyDataSetChanged();
chart.invalidate();
set.setColor(Color.RED);
//Collections.sort(entries, new EntryXComparator());
} catch (JSONException e) {
Toast.makeText(getContext(), "Fetch failed!", Toast.LENGTH_SHORT).show();
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getContext(), error.toString(), LENGTH_LONG).show();
}
}) {
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String, String> headers = new HashMap<String, String>();
headers.put("Authorization", "Bearer " + access_token);
headers.put("Content-Type", "application/x-www-form-urlencoded");
return headers;
}
/*
@Override
protected Map<String, String> getParams() throws com.android.volley.AuthFailureError {
Map<String, String> map = new HashMap<String, String>();
map.put("id", master_id);
map.put("accessID", accessID);
map.put("currentUser", master_id);
return map;
} */
};
requestQueue.add(stringRequest);
}
chart.getXAxis（）.setValueFormatter（新的IndexaxiValueFormatter（标签）） 也许试着把问题简化成一个小问题。在您的问题中有两个子任务，解析JSON和在图表上显示JSON。首先，请尝试并成功执行解析。为此，您需要包含您试图解析的JSON。我解析得很好，能够在图中显示，但信息设置不正确。编辑请检查您是否输入错误-输入构造函数中的第一个参数是x值，第二个是y值。这应该从您的logcat中清楚地看到，其中有5个条目都是x值80。您希望“标记”是y值而不是x值，因此在将条目添加到图表后不要对其进行排序，这将导致问题。此外，您还需要使用
IValueFormatter private void makeJsonObjectRequestGraph() {
RequestQueue requestQueue = Volley.newRequestQueue(getContext());
String URL1 = Navigation_URL_CHART + "?StdID=" + master_id;
StringRequest stringRequest = new StringRequest(Request.Method.GET, URL1,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONArray jArray = new JSONArray(response);
for (int i = 0; i < jArray.length(); i++) {
JSONObject jsonObject = jArray.getJSONObject(i);
String Marks = jsonObject.getString("Marks");
String examDescription = jsonObject.getString("examDescription");
if (examDescription.equals("First Term ")) {
entries.add(new BarEntry(i, Float.parseFloat(Marks)));
System.out.println(new BarEntry(i, Float.parseFloat(Marks)));
}
}
set = new LineDataSet(entries, "Wow");
data = new LineData(set);
chart.setData(data);
chart.notifyDataSetChanged();
chart.invalidate();
set.setColor(Color.RED);
//Collections.sort(entries, new EntryXComparator());
} catch (JSONException e) {
Toast.makeText(getContext(), "Fetch failed!", Toast.LENGTH_SHORT).show();
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getContext(), error.toString(), LENGTH_LONG).show();
}
}) {
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String, String> headers = new HashMap<String, String>();
headers.put("Authorization", "Bearer " + access_token);
headers.put("Content-Type", "application/x-www-form-urlencoded");
return headers;
}
/*
@Override
protected Map<String, String> getParams() throws com.android.volley.AuthFailureError {
Map<String, String> map = new HashMap<String, String>();
map.put("id", master_id);
map.put("accessID", accessID);
map.put("currentUser", master_id);
return map;
} */
};
requestQueue.add(stringRequest);
}
add this