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Null Pointer when adding header to ListView


Null Pointer when adding header to ListView

By : user2950668
Date : November 17 2020, 11:55 AM
wish helps you When you use convertViews, it means you are trying to recycle views. Imagine that when you get inside the getView and the location is a header.
It will check for the convertView and see it is not null, since it was recycled and it is from a row that is not a header.
code :


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Null pointer exception onFling on listview item in a fragment while trying to swipe delete in ListView

Null pointer exception onFling on listview item in a fragment while trying to swipe delete in ListView


By : Ajay Kumar Mohanty
Date : March 29 2020, 07:55 AM
wish helps you if you want to use Swipe delete feature, why don't you just use pre made libraries like this https://github.com/romannurik/Android-SwipeToDismiss and this https://github.com/timroes/SwipeToDismissUndoList
Adding a header to a ListView row or appending a header to group of items

Adding a header to a ListView row or appending a header to group of items


By : B.Balantes
Date : March 29 2020, 07:55 AM
I hope this helps you . Here is the solution customized for your problem: (Based on the Link you provided)
code :
private class CurAdapter extends CursorAdapter{


        private static final int VIEW_TYPE_GROUP_START = 0;
        private static final int VIEW_TYPE_GROUP_CONT = 1;
        private static final int VIEW_TYPE_COUNT = 2;

        LayoutInflater mInflater ;
        public CurAdapter(Context context, Cursor c, int flags) {
            super(context, c, flags);
            mInflater = LayoutInflater.from(context);


        }


        @Override
        public int getViewTypeCount() {
            return VIEW_TYPE_COUNT;
        }

        @Override
        public int getItemViewType(int position) {
            if (position == 0) {
                return VIEW_TYPE_GROUP_START;
            }
            Cursor cursor = getCursor();
            cursor.moveToPosition(position);
            boolean newGroup = isNewGroup(cursor, position);

            if (newGroup) {
                return VIEW_TYPE_GROUP_START;
            } else {
                return VIEW_TYPE_GROUP_CONT;
            }
        }

        @Override
        public void bindView(View view, Context context, Cursor c) {

            TextView tV = (TextView)view.findViewById(R.id.textView1); 
            TextView tV1 = (TextView)view.findViewById(R.id.textView2); 
            TextView tV2 = (TextView)view.findViewById(R.id.textView3);
            ImageView iM = (ImageView)view.findViewById(R.id.imageView2); 
            tV1.setTypeface(tf); 
            tV2.setTypeface(tf); 
            if(tV!=null)
                tV.setText(dateConvert(c.getString(c.getColumnIndexOrThrow("DateToNotify"))));


            String B = c.getString(c.getColumnIndexOrThrow("NotificationFor")); 
            tV1.setText(c.getString(c.getColumnIndexOrThrow("NotificationDateFor")));


            if(B.equalsIgnoreCase("1")){
                tV2.setText("Is "+c.getString(c.getColumnIndexOrThrow("NotificationData"))+" XXX");
                iM.setBackgroundResource(R.drawable.XXX); 

            }else if(B.equalsIgnoreCase("2")){
                tV2.setText("Is "+c.getString(c.getColumnIndexOrThrow("NotificationData"))+" XXX");
                iM.setBackgroundResource(R.drawable.icon_XXX); 

            }else if(B.equalsIgnoreCase("3")){

                tV2.setText("Is "+c.getString(c.getColumnIndexOrThrow("NotificationData"))+" XXX");

                iM.setBackgroundResource(R.drawable.icon_XXX); 

            }else if(B.equalsIgnoreCase("4")){

                tV2.setText("Is "+c.getString(c.getColumnIndexOrThrow("NotificationData"))+" XXX");
                iM.setBackgroundResource(R.drawable.icon_XXX); 

            }else if(B.equalsIgnoreCase("5")){

                tV2.setText("Is "+c.getString(c.getColumnIndexOrThrow("NotificationData"))+" XXX");
                iM.setBackgroundResource(R.drawable.icon_XXX); 

            }else if(B.equalsIgnoreCase("6")){
                tV2.setText("Is "+c.getString(c.getColumnIndexOrThrow("NotificationData"))+" XXX"); 
                iM.setBackgroundResource(R.drawable.icon_XXX); 

            }else if(B.equalsIgnoreCase("7")){

                tV2.setText("Is "+c.getString(c.getColumnIndexOrThrow("NotificationData"))+" XXX");
                iM.setBackgroundResource(R.drawable.icon_XXX); 
            }
        }

        @Override
        public View newView(Context context, Cursor cursor, ViewGroup parent) {

            int position = cursor.getPosition();
            int nViewType;

            if (position == 0) {
                nViewType = VIEW_TYPE_GROUP_START;
            } else {
                boolean newGroup = isNewGroup(cursor, position);
                if (newGroup) {
                    nViewType = VIEW_TYPE_GROUP_START;
                } else {
                    nViewType = VIEW_TYPE_GROUP_CONT;
                }
            }

            View v;

            if (nViewType == VIEW_TYPE_GROUP_START) {
                v = mInflater.inflate(R.layout.detail_list, parent, false);

                View vHeader = v.findViewById(R.id.relativeSecondary);
                vHeader.setOnClickListener(new OnClickListener() {
                    @Override
                    public void onClick(View v) {


                    }
                });
            } else {

                v = mInflater.inflate(R.layout.detail_list_no_header, parent, false);
            }
            return v;
        }


        private boolean isNewGroup(Cursor cursor, int position) {
            String ThisDate = dateConvert(cursor.getString(cursor.getColumnIndexOrThrow("DateToNotify"))); 
            cursor.moveToPosition(position - 1);
            String compareDate = dateConvert(cursor.getString(cursor.getColumnIndexOrThrow("DateToNotify"))); 
            cursor.moveToPosition(position);    
            if (!ThisDate.equalsIgnoreCase(compareDate)) {
                return true;
            }

            return false;
        }
    }
Why doesn't ListView.setAdapter(null) throw a null pointer exception?

Why doesn't ListView.setAdapter(null) throw a null pointer exception?


By : user2905598
Date : March 29 2020, 07:55 AM
wish of those help By chance I stumbled on this unique find. My code broke because I was getting a NullPointerException on my Adapter after implementing a LoaderManager when I didn't have the exception previously. ,
Why am I allowed to pass a null value into that function?
Adding addFooterView to Listview in Activity leads null pointer exception

Adding addFooterView to Listview in Activity leads null pointer exception


By : Lars H.
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Here I have to initialize listView before addFooterView.
First initialize
code :
footerView = getLayoutInflater().inflate(R.layout.listview_footer, null);
new FilesTask(baseurl, true).execute();
JavaFX ListView Null Pointer when Adding to List

JavaFX ListView Null Pointer when Adding to List


By : Rajaram
Date : March 29 2020, 07:55 AM
With these it helps Your @FXML annotated fields are static, which is not supported by JavaFX, as it is desinged to create/load multiple instances of the same fxml file/controller class. If you are unfamiliar with what 'static' actually means, you can refer to What is the difference between a static method and a non-static method?.
As for how you get the correct controller instance, you need to load the fxml file a little bit different.
code :
FXMLLoader loader = new FXMLLoader(getClass().getResource("IntelligentSystems.fxml"));
Parent root = loader.load(); // must be called before getting the controller!
GUIController controller = loader.getController();
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