Question

this is really strange, yesterday I asked the question Yesterdays question how to implement multiple editText listeners to avoid duplicating my code. I was kindly provided an answer (which I swear I tried out) but today I am getting no where with it. I am trying to do the following but am getting an Cannot instantiate the type TextWatcher error when trying to setup the tw Textwatcher.

**TextWatcher tw = new TextWatcher();**

intTextValue.addTextChangedListener(tw);

any help would be much appreciated. its starting to drive me a little crazy.

Ultimately I am trying to get to the following situation (which should be simple right??).

public class myClass extends Activity implements OnFocusChangeListener, TextWatcher {
private EditText et;
private EditText et1;
private EditText et2;
private int whoHasFocus= 0;

 public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.layout1);


        et = (EditText)findViewById(R.id.et);
        et.setOnFocusChangeListener(this);
        et.addTextChangedListener(tw);

        et1 = (EditText)findViewById(R.id.et);
        et1.setOnFocusChangeListener(this);
        et1.addTextChangedListener(tw);

        et2 = (EditText)findViewById(R.id.et);
        et2.setOnFocusChangeListener(this);
        et2.addTextChangedListener(tw);

}

        @Override
        public void onFocusChange(View v, boolean hasFocus) {

            switch (v.getId()) {
            case R.id.et:
                whoHasFocus =1;
                break;
            case R.id.et1:
                whoHasFocus =2;
                break;
            case R.id.et2:
                whoHasFocus=3;
                break;              
            }


        }

    @Override
    public void afterTextChanged(Editable s) {
        switch (whoHasFocus) {
            case 1:
                //do code
                break;
            case 2:
                //do code
                break;
            case 3:
                //do code
                break;              
            }

    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count,
            int after) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        // TODO Auto-generated method stub

    }

}

Answer 1

You don’t need a TextWatcher instance, just use “this”

et.addTextChangedListener(this);
et1.addTextChangedListener(this);
et2.addTextChangedListener(this);