EditText, OnKeyListener or TextWatcher (barcode scan)

Question

I am using a barcode scanner that inserts a barcode line into an EditText in this format "12345 \ n". Instead of using the search button, I want to trigger a search event with the character "\ n". I used TextEdit addTextChangedListener and inside this function that I execute:

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

 }

 @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
  char lastCharacter = s.charAt(s.length() - 1);

  if (lastCharacter == '\n') {
   String barcode = s.subSequence(0, s.length() - 1).toString();
   searchBarcode(barcode);
  }
 }
};

It works very well for the first time, but I also want to clear the EditText after each scan. But this cannot be done inside the afterTextChanged event, because it goes into a recursive loop or something like that.

Here is another solution that works pretty well:

editBarcode.setOnKeyListener(new OnKeyListener() {

@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
    // TODO Auto-generated method stub
    String barcode = editBarcode.getText().toString();

    if (keyCode == KeyEvent.KEYCODE_ENTER && barcode.length() > 0) {
        editBarcode.setText("");
        searchBarcode(barcode);
        return true;
    }

    return false;
}
});

Actually, I'm not sure if this is the right way to do this. Maybe I can use the EditText OnKeyListener event. Any suggestions?

thank

Answer 1

EditText afterTextChanged(), .

 @Override 
 public void afterTextChanged(Editable s) { 
  if (s.length > 0) {

      char lastCharacter = s.charAt(s.length() - 1); 

      if (lastCharacter == '\n') { 
       String barcode = s.subSequence(0, s.length() - 1).toString();
       myEditText.setString("");
       searchBarcode(barcode); 
      }
  } 

Answer 2

@Hrk , myEditText.setString() .

:

editText.addTextChangedListener(new TextWatcher() {

  ...

  @Override
  public void afterTextChanged(Editable s) {
    if (s.toString().trim().length() == 0)
      return;

    //do your work, then clear the text here
    s.clear();
  }
});