How do i get listview's child?

Question

I want to change text in textview which is in a listview on click

listViewMessage = (ListView) rootview.findViewById(R.id.listView);      
listViewMessage.setOnItemClickListener(new AdapterView.OnItemClickListener() {
     public void onItemClick(AdapterView<?> parent, View view, final int position, long id) {
     txtViewMess = (TextView) listViewMessage.getChildAt(position).findViewById(R.id.textViewMessage); //error
     txtViewMess.setText("Paid");
    }
    });

Code worked for a couple of textview, but some turned to

 java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.View.findViewById(int)' on a null object reference

Possible duplicate of [What is a NullPointerException, and how do I fix it?](https://stackoverflow.com/questions/218384/what-is-a-nullpointerexception-and-how-do-i-fix-it) — KeLiuyue, Nov 09 '17 at 02:41

score 1 · Answer 1 · answered Nov 09 '17 at 05:05

1

just get it like this

TextView tv=adapterView.getSelectedView().findViewById(R.id.my_tv);

answered Nov 09 '17 at 05:05

himel

460
5
13

score 1 · Answer 2 · answered Nov 09 '17 at 05:57

1

You are using wrong view to initialize your text view:

listViewMessage = (ListView) rootview.findViewById(R.id.listView);      
listViewMessage.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, final int 
position, long id) {
txtViewMess = (TextView) 
view.getChildAt(position).findViewById(R.id.textViewMessage); //error
txtViewMess.setText("Paid");
}
});

answered Nov 09 '17 at 05:57

Muhammad Saad Rafique

3,030
1
11
21

This will work. Dont forget to mark this post as answer if it works as it will help others in future too.Happy Coding :) – Muhammad Saad Rafique Nov 09 '17 at 05:58

KeLiuyue · Accepted Answer · 2017-11-09T03:38:18.377

0

You can use callback in your code .

YourAdapter

@Override
public View getView(final int i, View view, ViewGroup viewGroup) {
    ViewHolder viewHolder = null;
    ...
    viewHolder.mTextView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            mTextClickListener.onTextClick(i);
        }
    });
    return view;
}

/**
 * text click
 */
public interface onItemTextClickListener {
    void onTextClick(int i);
}

private onItemTextClickListener mTextClickListener;

public void setOnItemTextClickListener(onItemTextClickListener mTextClickListener) {
    this.mTextClickListener = mTextClickListener;
}

class ViewHolder {
    TextView mTextView;
}

Call method

mAdapter.setOnItemTextClickListener(new onItemTextClickListener() {
        @Override
        public void onTextClick(int i) {
            // do something here
        }
});

edited Nov 09 '17 at 03:38

answered Nov 09 '17 at 02:45

KeLiuyue

7,831
4
23
39

This didn't work, but I tried txtViewMess = (TextView) listViewMessage.getChildAt(position).findViewById(R.id.textViewMessage); to view.findViewById(R.id.textViewMessage); and it's worked perfectly – AndyJJ Nov 09 '17 at 03:07
Good luck to you. – KeLiuyue Nov 09 '17 at 03:18
You can check my answer again. – KeLiuyue Nov 09 '17 at 05:27

How do i get listview's child?

3 Answers3