How to remove all listeners added with addTextChangedListener

Question

I have a ListView where each row has an EditText control. I want to add a TextChangedListener to each row; one that contains extra dat

Answer 1

There is no way to do this using current EditText interface directly. I see two possible solutions:

1. Redesign your application so you always know what TextWatcher are added to particular EditText instance.
2. Extend EditText and add possibility to clear all watchers.

Here is an example of second approach - ExtendedEditText:

public class ExtendedEditText extends EditText
{   
    private ArrayList mListeners = null;

    public ExtendedEditText(Context ctx)
    {
        super(ctx);
    }

    public ExtendedEditText(Context ctx, AttributeSet attrs)
    {
        super(ctx, attrs);
    }

    public ExtendedEditText(Context ctx, AttributeSet attrs, int defStyle)
    {       
        super(ctx, attrs, defStyle);
    }

    @Override
    public void addTextChangedListener(TextWatcher watcher)
    {       
        if (mListeners == null) 
        {
            mListeners = new ArrayList();
        }
        mListeners.add(watcher);

        super.addTextChangedListener(watcher);
    }

    @Override
    public void removeTextChangedListener(TextWatcher watcher)
    {       
        if (mListeners != null) 
        {
            int i = mListeners.indexOf(watcher);
            if (i >= 0) 
            {
                mListeners.remove(i);
            }
        }

        super.removeTextChangedListener(watcher);
    }

    public void clearTextChangedListeners()
    {
        if(mListeners != null)
        {
            for(TextWatcher watcher : mListeners)
            {
                super.removeTextChangedListener(watcher);
            }

            mListeners.clear();
            mListeners = null;
        }
    }
}

And here is how you can use ExtendedEditText in xml layouts: