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Also, hier ist der Fall, in der OnPostExecute-Methode habe ich eine ListView verwendet und ich habe einen Listenadapter darin angepasst, um die Objekte anzuzeigen (Ereignisse) in einer Listenansicht. Das Problem besteht darin, dass der Adapter die Objekte erkennt, sie jedoch nicht in der ListView anzeigt. Ich habe untersucht, wie ich ein Array von Hashmaps mit einem List-Adapter füllen kann, und ich bin sicher, dass ich es in meinem Code richtig gemacht habe. Ich denke, dass das Problem in der XML-Datei sein könnte. Irgendwelche Ideen, die mich in die richtige Richtung lenken können?List Adapter empfängt die Objekte, aber es zeigt sie nicht in der Listenansicht
Dies ist meine XML-Datei:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ListView
android:id="@android:id/list"
android:layout_width="match_parent"
android:layout_height="match_parent">
</ListView>
<TextView
android:id="@+id/id"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingBottom="2dip"
android:paddingTop="6dip"
android:textSize="16sp"/>
<TextView
android:id="@+id/title"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingBottom="2dip" />
<TextView
android:id="@+id/date"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="start"/>
<TextView
android:id="@+id/time"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="start" />
<TextView
android:id="@+id/time_end"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="start" />
</LinearLayout>
Und die .java-Datei:
public class EventsJSONActivity extends ListActivity {
private static String url = "http://mob.students.acg.edu/json3.php";
public static final String TAG_EVENT_INFO = "eventsinfo";
public static final String TAG_ID = "id";
public static final String TAG_TITLE = "title";
public static final String TAG_DATE = "date";
public static final String TAG_TIME = "time";
public static final String TAG_TIME_END = "time_end";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_events_json);
new GetEvents().execute();
}
class GetEvents extends AsyncTask<Void,Void,Void> {
ArrayList<HashMap<String,String>> eventList;
ProgressDialog proDialog;
@Override
protected void onPreExecute() {
super.onPreExecute();
proDialog = new ProgressDialog(EventsJSONActivity.this);
Log.d("prodialog: ","Setting Message.");
proDialog.setMessage("Please wait...");
Log.d("prodialog: ","Setting cancellable.");
proDialog.setCancelable(false);
Log.d("prodialog: ","Showing...");
proDialog.show();
}
@Override
protected Void doInBackground(Void... arg0) {
WebRequest webreq = new WebRequest();
String url = "http://mob.students.acg.edu/json3.php";
String jsonStr = webreq.makeWebServiceCall(url,WebRequest.POSTRequest);
Log.d("Response: ", "> " + jsonStr);
eventList = ParseJSON(jsonStr);
Log.d("eventList info: " , eventList.toString());
return null;
}
//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
@Override
protected void onPostExecute(Void requestresult) {
super.onPostExecute(requestresult);
if (proDialog.isShowing()) {
proDialog.dismiss();
Log.d("prodialog: ","dismissing dialog.");
}
Log.d("Listadapter: ", "eventList: " + eventList.toString());
ListAdapter adapter = new SimpleAdapter(
EventsJSONActivity.this,eventList,
android.R.layout.simple_list_item_1,
new String[] {TAG_ID, TAG_TITLE, TAG_DATE, TAG_TIME, TAG_TIME_END},
new int[] {R.id.id,R.id.title,R.id.date,R.id.time,R.id.time_end});
Log.d("Listadapter: ","data fed");
ListView lv = (ListView)findViewById(android.R.id.list);
lv.setAdapter(adapter);
Log.d("Listadapter: ",adapter.getCount() + " items set");
}//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
private ArrayList<HashMap<String,String>> ParseJSON(String json) {
if (json != null) {
try {
ArrayList<HashMap<String,String>> eventList = new ArrayList<>();
JSONObject jsonObj = new JSONObject(json);
JSONArray events = jsonObj.getJSONArray(TAG_EVENT_INFO);
for (int i = 0; i < events.length(); i++) {
JSONObject j = events.getJSONObject(i);
String id = j.getString(TAG_ID);
String title = j.getString(TAG_TITLE);
String date = j.getString(TAG_DATE);
String time = j.getString(TAG_TIME);
String time_end = j.getString(TAG_TIME_END);
HashMap<String,String> event = new HashMap<String,String>();
event.put(TAG_ID,id);
event.put(TAG_TITLE,title);
event.put(TAG_DATE,date);
event.put(TAG_TIME,time);
event.put(TAG_TIME_END,time_end);
/*event.put(TAG_ID,"id");
event.put(TAG_TITLE,"title");
event.put(TAG_DATE,"date");
event.put(TAG_TIME,"time");
event.put(TAG_TIME_END,"time_end");*/
eventList.add(event);
}
Log.d("EventList > ", eventList.toString());
return eventList;
} catch (JSONException e) {
e.printStackTrace();
return null;
}
} else {
Log.e("ServiceHandler", "No data received from HTTP Request");
return null;
}
}
}
}