Adding Listeners to EditText in a Custom Array Adapter in Android

Question

In an activity I have a CustomListAdapter that contains two EditText fields for each row in the CustomListAdapter. Currently, I have OnFocusChangeListeners that updates the values taken from the EditText, and saves them into a database. However, the last changed value never gets updated. All changed values are saved, but the last one doesn't get saved because the focus was never changed after it was modified. The user changes the last value, clicks "back", and the OnFocusChangeListener never gets called again; therefore, the last value doesn't get saved.

So I tried to use an AddOnTextChangedListener ... however, I can only update the first element in the CustomListAdapter. Not only that, whenever I update the first element, it propagates to all the rest of the elements in the CustomListAdapter, setting the values of the EditText of all other rows to the first EditText field's value. Whenever I change any other row, nothing happens. I saw that the TextChangeListener gets called for every position in the list adapter, even if the text was not changed.

Is there a way to add a listener to each EditText in the CustomListAdapter so that it updates each individual EditText element corresponding to the correct data[position] in the CustomListAdapter?

Code snippet:

public class CustomListAdapter extends ArrayAdapter {
    ArrayList data;

    [...]

    class MyTextWatcher implements TextWatcher {
        private int position;

        public MyTextWatcher(int position) {
            this.position = position;
        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {

        }

        public void afterTextChanged(Editable s) {
            arraymap.put(position, Double.valueOf(s.toString()));
        }
    }

    [...]

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

    final EditText editText1 = (EditText) convertView.findViewById(R.id.edit_text1);
    final EditText editText2 = (EditText) convertView.findViewById(R.id.edit_text2);

    editText1.setOnFocusChangeListener(new View.OnFocusChangeListener() {
        public void onFocusChange(View v, boolean hasFocus) {
                    data[position].save();
                }
            }
        }
    });

    editText2.setOnFocusChangeListener(new View.OnFocusChangeListener() {
        public void onFocusChange(View v, boolean hasFocus) {
                    data[position].save();
                }
            }
        }
    });

    [...]

    //----------------------ALSO TRIED----------------------------
    editText1.addTextChangedListener(new MyTextWatcher(position));

    [...]

    }
}

Answer 1

Okay. So as per my comment, I suggested to simply create a variable that temporarily stores the values when they are changed, then just send it to your DB afterwards.

But as I see your code, you are trying to have this inside the your Adapter class, which I think complicates things. So I went and looked around on how to implement this in a much more simpler way.

You're Adapter class, presuming that this is being used by a ListView, you can actually iterate over the listview items and read the values of the EditTexts from the Activity where the ListView is by creating a simple function, like so:

private List<SampleObj> retrieveTexts() {
        List<SampleObj> sampleObjs = new ArrayList<>();
        for (int i = 0; i < lv.getCount(); i++) {
            View item = lv.getChildAt(i);
            EditText et1 = (EditText) item.findViewById(R.id.et1);
            EditText et2 = (EditText) item.findViewById(R.id.et2);

            SampleObj so = new SampleObj(et1.getText().toString(), et2.getText().toString());
            sampleObjs.add(so);
        }
        return sampleObjs;
    }

The SampleObj here is just a class I made as a sample. It's simply an object with two String values (referring to the two EditText in your listview item).

public class SampleObj {

    String text1;
    String text2;

    public SampleObj() {
    }

    public SampleObj(String text1, String text2) {
        this.text1 = text1;
        this.text2 = text2;
    }

    public void setText1(String text1) {
        this.text1 = text1;
    }

    public void setText2(String text2) {
        this.text2 = text2;
    }

    public String getText1() {
        return text1;
    }

    public String getText2() {
        return text2;
    }

    @Override
    public String toString() {
        return "SampleObject { text1 = " + text1 + ", text2 = " + text2 + "}";
    }
}

So calling retrieveTexts() will return a list of SampleObjs that has the values you need. I made a log on what I was able to do and this is it's result:

D/SAMPLE: [SampleObject { text1 = 50, text2 = 0}, SampleObject { text1 = 50, text2 = 0}, SampleObject { text1 = 50, text2 = 0}, SampleObject { text1 = 50, text2 = 0}]

It would always retrieve the current value of the EditTexts. What you do with the data collected is now up to you (send it to DB). Just call it whenever you need it. Cheers! :D

Here's a post I used as reference for this. :)