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Ich habe diesen Code geschrieben. Irgendwie, wenn ich notifyDatasetChanged auf meinem Adapter anrufe, funktioniert es nicht. Kann mir jemand erklären, warum das nicht funktioniert?adapter.notifyDataSetChanged() funktioniert nicht
Auch ich habe eine andere Frage (ich denke damit verwandt) Ich gebe bei der Erstellung der Klasse eine HoodID = 27 aber wie kann ich das anders machen, denn wenn ich das mache kann ich nicht das erste Element in meinem Spinner auswählen . Deklarieren
package com.example.sander.app;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.content.Context;
import android.location.Location;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout;
import android.widget.Spinner;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import com.jjoe64.graphview.GraphView;
import com.jjoe64.graphview.LegendRenderer;
import com.jjoe64.graphview.helper.StaticLabelsFormatter;
import com.jjoe64.graphview.series.BarGraphSeries;
import com.jjoe64.graphview.series.DataPoint;
import com.jjoe64.graphview.series.DataPointInterface;
import com.jjoe64.graphview.series.LineGraphSeries;
import com.jjoe64.graphview.series.OnDataPointTapListener;
import com.jjoe64.graphview.series.Series;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import android.R.layout.*;
import android.widget.Toast;
/**
* Created by Sander on 8-4-2017.
*/
public class GraphFrame extends Fragment implements AdapterView.OnItemSelectedListener {
Integer hoodSelector = 27;
ArrayList<HoodData> hoodDataList = new ArrayList<>();
ArrayList<String> hoodList = new ArrayList<>();
Context mContext;
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
public void refreshFragment(){
hoodDataList.clear();
FragmentTransaction transaction = getFragmentManager().beginTransaction();
transaction.detach(this).attach(this).commit();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
final View view = inflater.inflate(R.layout.fragment_graph,
container, false);
//API Request for all the hoods
getDataFromApi((GraphView) view.findViewById(R.id.graph));
getDataForSpinner((Spinner) view.findViewById(R.id.spinner));
return view;
}
public void setHoodId(Integer hood){
hoodSelector = hood;
}
public void getDataFromApi(final GraphView graph) {
RequestQueue rq = Volley.newRequestQueue(getActivity().getApplicationContext());
String url= "http://test.dontstealmywag.ga/api/damage_or_theft_car_wijk.php?hood_id=" + hoodSelector;
StringRequest stringRequest = new StringRequest(Request.Method.GET, url,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
// Do something with the response
try{
JSONObject o = new JSONObject(response);
JSONArray values=o.getJSONArray("");
for (int i = 0; i < values.length(); i++) {
JSONObject jsonObject = values.getJSONObject(i);
hoodDataList.add(new HoodData(jsonObject.getDouble("percentage"), jsonObject.getInt("hood_id"), jsonObject.getInt("year"), jsonObject.getString("hood_name")));
}
} catch (JSONException ex){}
StaticLabelsFormatter staticLabelsFormatter = new StaticLabelsFormatter(graph);
LineGraphSeries<DataPoint> series = new LineGraphSeries<>(new DataPoint[] {
new DataPoint(1, hoodDataList.get(0).getPercentage()),
new DataPoint(2, hoodDataList.get(1).getPercentage()),
new DataPoint(3, hoodDataList.get(2).getPercentage()),
new DataPoint(4, hoodDataList.get(3).getPercentage()),
new DataPoint(5, hoodDataList.get(4).getPercentage())
//new DataPoint(12, 0)
});
// set manual x bounds
staticLabelsFormatter.setHorizontalLabels(new String[] {"2006", "2007","2008","2009","2011"});
//creates custom x-axis
graph.getGridLabelRenderer().setLabelFormatter(staticLabelsFormatter);
graph.setTitle("Wijk " + hoodSelector + " - " + hoodDataList.get(0).getHood_name());
//set nice background color :)
series.setDrawBackground(true);
//shows points at datapoints
series.setDrawDataPoints(true);
//size of the points
series.setDataPointsRadius(10.0f);
series.setOnDataPointTapListener(new OnDataPointTapListener() {
@Override
public void onTap(Series series, DataPointInterface dataPoint) {
Toast.makeText(getActivity(), "Punt "+ dataPoint, Toast.LENGTH_SHORT).show();
}
});
series.setTitle("%");
series.setAnimated(true);
graph.getLegendRenderer().setVisible(true);
graph.getLegendRenderer().setAlign(LegendRenderer.LegendAlign.TOP);
graph.addSeries(series);
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
// Handle error
}
});
rq.add(stringRequest);
}
public void getDataForSpinner(final Spinner spinner){
RequestQueue rq = Volley.newRequestQueue(getActivity().getApplicationContext());
String url= "http://test.dontstealmywag.ga/api/damage_or_theft_car_wijk.php";
StringRequest stringRequest = new StringRequest(Request.Method.GET, url,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
// Do something with the response
try{
JSONObject o = new JSONObject(response);
JSONArray values=o.getJSONArray("");
for (int i = 0; i < values.length(); i++) {
JSONObject jsonObject = values.getJSONObject(i);
if (!hoodList.contains(jsonObject.getString("hood_name"))) {
hoodList.add(jsonObject.getString("hood_name"));
}
}
} catch (JSONException ex){}
final ArrayAdapter<String> adapter = new ArrayAdapter<String>(spinner.getContext(), android.R.layout.simple_spinner_item, hoodList);
// Specify the layout to use when the list of choices appears
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// Apply the adapter to the spinner
spinner.setPrompt("Title");
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String item = parent.getItemAtPosition(position).toString();
// Showing selected spinner item
for(int i = 1; i < hoodList.size(); i++) {
if (item.equals(hoodList.get(i))) {
setHoodId(i + 27);
adapter.notifyDataSetChanged();
}
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
// Handle error
}
});
rq.add(stringRequest);
}
}
Sie können adapter.notifyItemChanged versuchen (Position); –
Was erwartest du zu passieren? Das heißt, wie soll das funktionieren? Wenn Sie 'notifyDataSetChanged()' aufrufen, haben Sie im 'Adapter' nichts geändert, daher gibt es nichts zu aktualisieren. –
@Mike M. Ich erwarte, dass es die Werte meines Graphen beim Drücken des Spinner aktualisiert –