Can you tell me how to use textwatcher

check this:

public void addKeyListener() {

// get edittext component
edittext = (EditText) findViewById(R.id.editText);
edittext1 = (EditText) findViewById(R.id.editText1);



// add a keylistener to keep track user input
edittext.setOnEditorActionListener(new TextView.OnEditorActionListener() {
@Override
public boolean onEditorAction(TextView v, int keyCode, KeyEvent event) {

// if keydown and "enter" is pressed
if(keyCode == EditorInfo.IME_ACTION_GO)
{
edittext1.requestFocus();
return true;
}


return false;
} });

edittext1.addTextChangedListener(new TextWatcher() {

@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
// TODO Auto-generated method stub
// if keydown and "enter" is pressed
if(b == EditorInfo.IME_ACTION_GO) {

//hide the keyboard
InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(edittext.getWindowToken(), 0);
imm.hideSoftInputFromWindow(edittext1.getWindowToken(), 0);
// display a floating message
Toast.makeText(MyAndroidAppActivity.this, edittext.getText().toString() + " " + edittext1.getText().toString(), Toast.LENGTH_SHORT).show();
return true;
}

return false;
}

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

}

@Override
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub

}
});
}