jakebonk / draggabletreeview Goto Github PK

In my case, I copied your example but all TreeNodes are always expanded I try to call set Expanded(False), but it has no effect the TreeNodes doesn't collapse. I also tried to call setExpanded(false) recursive but at all it change nothing. How can i use setExpanded to collapse my TreeNodes?

hello sir, i need your help with this,
i have problem when i implement on fragment, but its fine when i implement in activity.
what should i fill on adapter first parameter ?

this is my code :
public class CategorySubFragment extends Fragment {
private FloatingActionButton fabAddCategory;
public static ArrayList arrayCategory;
private DraggableTreeView draggableTreeView;

public CategorySubFragment() {
    // Required empty public constructor
}


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.fragment_category_sub, container, false);
}

@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    fabAddCategory = view.findViewById(R.id.fab_add_category);
    draggableTreeView = (DraggableTreeView)view.findViewById(R.id.d_tree_view);

    TreeNode root = new TreeNode(this);
    TreeNode item = new TreeNode("Item 1");
    TreeNode item2 = new TreeNode("Item 2");
    TreeNode subitem = new TreeNode("Sub Item 2");

    subitem.addChild(new TreeNode("Sub Sub Item 1"));

    item.addChild(subitem);
    item.addChild(new TreeNode("Sub Item 1"));
    root.addChild(new TreeNode("Item 3"));
    root.addChild(new TreeNode("Item 4"));
    root.addChild(new TreeNode("Item 5"));
    root.addChild(new TreeNode("Item 6"));
    root.addChild(new TreeNode("Item 7"));
    root.addChild(new TreeNode("Item 8"));
    root.addChild(new TreeNode("Item 9"));
    root.addChild(new TreeNode("Item 10"));
    root.addChild(new TreeNode("Item 11"));
    root.addChild(new TreeNode("Item 12"));
    root.addChild(item2);
    root.addChild(item);
    SimpleTreeViewAdapter adapter = new SimpleTreeViewAdapter(getActivity().getApplicationContext(), root);
    draggableTreeView.setAdapter(adapter);

    arrayCategory = new ArrayList<>();

    ((AppCompatActivity) getActivity()).getSupportActionBar().setTitle(getResources().getString(R.string.category));

    fabAddCategory.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //startActivityForResult(new Intent(getContext(), AddCategoryActivity.class), REQ_CODE_ADD_CAT);
            startActivityForResult(new Intent(getContext(), AddCategory.class), REQ_CODE_ADD_CAT);
        }
    });
}

and this is my error :

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.LinearLayout.addView(android.view.View)' on a null object reference
    at com.allyants.draggabletreeview.DraggableTreeView.createTreeItem(DraggableTreeView.java:445)
    at com.allyants.draggabletreeview.DraggableTreeView.inflateViews(DraggableTreeView.java:111)
    at com.allyants.draggabletreeview.DraggableTreeView.inflateViews(DraggableTreeView.java:117)
    at com.allyants.draggabletreeview.DraggableTreeView.notifyDataSetChanged(DraggableTreeView.java:105)
    at com.allyants.draggabletreeview.DraggableTreeView.setAdapter(DraggableTreeView.java:98)
    at com.batavianet.aipos.ui.main.item.category.CategorySubFragment.onViewCreated(CategorySubFragment.java:76)

this error showed on :
draggableTreeView.setAdapter(adapter);

thankyou, love your works

Hi, is it possible just to use drag and drop to reorder items? I mean is it possible to turn off the sub level item insertion?

I'm using MvvmCross for my android application. Is it possible to populate draggable tree view with data from viewmodel??

I am getting this NullPointerException error
2020-05-14 12:42:28.778 12251-12251/com.app.hardik.studypdf E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.app.hardik.studypdf, PID: 12251
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.LinearLayout.addView(android.view.View)' on a null object reference
at com.allyants.draggabletreeview.DraggableTreeView.createTreeItem(DraggableTreeView.java:369)
at com.allyants.draggabletreeview.DraggableTreeView.inflateViews(DraggableTreeView.java:83)
at com.allyants.draggabletreeview.DraggableTreeView.inflateViews(DraggableTreeView.java:89)
at com.allyants.draggabletreeview.DraggableTreeView.notifyDataSetChanged(DraggableTreeView.java:77)
at com.allyants.draggabletreeview.DraggableTreeView.setAdapter(DraggableTreeView.java:70)
at com.app.hardik.studypdf.ListFragment.onCreateView(ListFragment.kt:72)
at androidx.fragment.app.Fragment.performCreateView(Fragment.java:2600)
at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:881)
at androidx.fragment.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManagerImpl.java:1238)
at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:1303)
at androidx.fragment.app.BackStackRecord.executeOps(BackStackRecord.java:439)
at androidx.fragment.app.FragmentManagerImpl.executeOps(FragmentManagerImpl.java:2079)
at androidx.fragment.app.FragmentManagerImpl.executeOpsTogether(FragmentManagerImpl.java:1869)
at androidx.fragment.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManagerImpl.java:1824)
at androidx.fragment.app.FragmentManagerImpl.execPendingActions(FragmentManagerImpl.java:1727)
at androidx.fragment.app.FragmentManagerImpl$2.run(FragmentManagerImpl.java:150)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)