Click on image inside ArrayAdapter to remove item in listview

Question

I have Fragment...

    public class MyFragment extends Fragment {...

which calls adapter...

    MyArrayAdapter adapter = new MyArrayAdapter...
    my.setAdapter(adapter);

adapter has image for delete item. I can listen image click but cannot remove item from listview which is in fragment.

public class MyArrayAdapter extends ArrayAdapter<String> {...

public View getView(final int position, View convertView, ViewGroup parent) {...

    ImageView imageView = (ImageView) rowView.findViewById(R.id.icon);
    imageView.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
        // ???????????
        ...}

Simple remove object from data of adapter and call `notifyDatasetChnaged()` of adapter in `ImageView's onClick()` — user370305, Feb 27 '15 at 20:09
On imageView onClick to use "this"... I don't understand well. Sorry. — Arnes, Feb 27 '15 at 20:19
@Arnes your class `extends ArrayAdapter`. you can use `MyArrayAdapter.this.notifyDatasetChnaged()` — Hamidreza Samadi, Feb 27 '15 at 20:19

score 2 · Accepted Answer · answered Feb 27 '15 at 20:21

2

Because your click is inside an OnClickListener inner class you must specify MyArrayAdapter.this to access the functions of the adapter from inside the click listener. If you just use this you will be referring to the OnClickListener and will only have access to methods on that class.

Like so:

public View getView(final int position, View convertView, ViewGroup parent) {

    ImageView imageView = (ImageView) rowView.findViewById(R.id.icon);
    imageView.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            MyArrayAdapter.this.remove(getItem(position));
            MyArrayAdapter.this.notifyDataSetChanged();
        }
}

answered Feb 27 '15 at 20:21

Bobbake4

24,509
9
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this one crashes the app, also :( – Arnes Feb 27 '15 at 20:44
02-27 21:25:31.781: E/AndroidRuntime(11332): FATAL EXCEPTION: main 02-27 21:25:31.781: E/AndroidRuntime(11332): java.lang.UnsupportedOperationException 02-27 21:25:31.781: E/AndroidRuntime(11332): at java.util.AbstractList.remove(AbstractList.java:638) 02-27 21:25:31.781: E/AndroidRuntime(11332): at java.util.AbstractList$SimpleListIterator.remove(AbstractList.java:75) 02-27 21:25:31.781: E/AndroidRuntime(11332): at java.util.AbstractCollection.remove(AbstractCollection.java:229) 02-27 21:25:31.781: E/AndroidRuntime(11332): at android.widget.ArrayAdapter.remove(ArrayAdapter.java:244) – Arnes Feb 27 '15 at 21:27
It's probably because you initialize your adapter with an array ie: String[] instead of a list ie: ArrayList. Without seeing the entire MyArrayAdapter constructor it's hard to tell. – Bobbake4 Feb 28 '15 at 02:44

score 0 · Answer 2 · answered Feb 27 '15 at 20:06

0

Has been a long time since I did Java, but as far I can remember you can use this:

this.remove(position);
this.notifyDataSetChanged();

answered Feb 27 '15 at 20:06

laurens

1

This is the current object, you are calling a static that might or might not be initialized yet, probably not. – laurens Feb 28 '15 at 18:21

score 0 · Answer 3 · answered Feb 27 '15 at 20:28

You could write a method inside your adapter:

private boolean removeItemByPosition(int position){
    try{
        items.remove(position);
        this.notifyDataSetChanged();
        return true;
    } catch (Exception e){
        e.printStackTrace();
        return false;
    }   
}

In some cases, id the notifyDataSetChanged() method doesn't work, try with re-setting the ListView Adapter, you shuould be able to do this inside the Fragment.

score -1 · Answer 4 · answered Feb 27 '15 at 20:12

-1

simply call convertView.setVisibility(View.GONE);

answered Feb 27 '15 at 20:12

OWADVL

10,704
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Click on image inside ArrayAdapter to remove item in listview

4 Answers4