I'm trying to make a ExpandableListView in Android which shows a list of problems. When I'm running the app, nothing is displayed on the screen. I'm not sure why or how this happens. Can anyone help me with this.
I wan't to make clear that I get data from a server, which get saved in objects ( aka problems). I've tested this a lot and nothing is wrong with this code. So the data to show is available but won't show up in the app.
I'm using the following code:
PlaceHolderFragment:
public static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
// Progress dialog
private ProgressDialog pDialog;
private static String TAG = Problems.class.getSimpleName();
private ArrayList<Problem> myProblems = new ArrayList<Problem>();
private SparseArray<Group> groups = new SparseArray<Group>();
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
//Here comes code that handles data input from server ( which correctly works btw )
for(int i = 0; i < myProblems.size(); i++){
Group group = new Group(myProblems.get(i).getTitle());
group.children.add(myProblems.get(i).domainsToString());
group.children.add(myProblems.get(i).getDescription());
groups.append(i, group);
}
View rootView = inflater.inflate(R.layout.fragment_my_problems, container, false);
mMyProblems = (ExpandableListView) rootView.findViewById(R.id.my_problems);
//mMyProblems.setAdapter(adapterMyP);
MyProblemExpandableListViewAdapter adapter = new MyProblemExpandableListViewAdapter(this.getActivity(), groups);
mMyProblems.setAdapter(adapter);
return rootView;
}
private void showpDialog() {
if (!pDialog.isShowing())
pDialog.show();
}
private void hidepDialog() {
if (pDialog.isShowing())
pDialog.dismiss();
}
}
the adapter:
public class MyProblemExpandableListViewAdapter extends BaseExpandableListAdapter {
private final SparseArray<Group> groups;
public LayoutInflater inflater;
public Activity activity;
public MyProblemExpandableListViewAdapter(Activity act, SparseArray<Group> groups) {
activity = act;
this.groups = groups;
inflater = act.getLayoutInflater();
}
@Override
public Object getChild(int groupPosition, int childPosition) {
return groups.get(groupPosition).children.get(childPosition);
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return 0;
}
@Override
public View getChildView(int groupPosition, final int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
final String children = (String) getChild(groupPosition, childPosition);
TextView text = null;
if (convertView == null) {
convertView = inflater.inflate(R.layout.listrow_details, null);
}
text = (TextView) convertView.findViewById(R.id.textView1);
text.setText(children);
convertView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(activity, children,
Toast.LENGTH_SHORT).show();
}
});
return convertView;
}
@Override
public int getChildrenCount(int groupPosition) {
return groups.get(groupPosition).children.size();
}
@Override
public Object getGroup(int groupPosition) {
return groups.get(groupPosition);
}
@Override
public int getGroupCount() {
return groups.size();
}
@Override
public void onGroupCollapsed(int groupPosition) {
super.onGroupCollapsed(groupPosition);
}
@Override
public void onGroupExpanded(int groupPosition) {
super.onGroupExpanded(groupPosition);
}
@Override
public long getGroupId(int groupPosition) {
return 0;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = inflater.inflate(R.layout.listrow_group, null);
}
Group group = (Group) getGroup(groupPosition);
((CheckedTextView) convertView).setText(group.string);
((CheckedTextView) convertView).setChecked(isExpanded);
return convertView;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return false;
}
}
and the group class:
public class Group {
public String string;
public final List<String> children = new ArrayList<String>();
public Group(String string) {
this.string = string;
}
}
And the appropriate xml files:
fragementMyProblems.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.wsi.wesupportit.Problems$PlaceholderFragment" >
<ExpandableListView
android:id="@+id/my_problems"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ExpandableListView>
</LinearLayout>
listrow_group.xml
<CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="?android:attr/listPreferredItemHeight"
android:layout_marginLeft="8dp"
android:gravity="left"
android:paddingLeft="32dp"
android:paddingTop="8dp"
android:text="Test"
android:textSize="14sp"
android:textStyle="bold" />
listrow_details.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="40dp"
android:clickable="true"android:orientation="vertical"
android:paddingLeft="40dp">
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:drawablePadding="5dp"
android:gravity="center_vertical"
android:text="@string/hello_world"
android:textSize="14sp"
android:textStyle="bold" >
</TextView>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="@android:color/black" />
</LinearLayout>
Thanks in advance.
Make your MyProblemExpandableListViewAdapter final and place it on top of the class. And make sure you that you notify your adapter every time you change the contents of your groups