Keep soft keyboard open when enter key is pressed

Well, I'm trying to prevent the soft keyboard from closing when the user press the "ok" button after editing a text field. Actually, what i'm trying to achieve is : when "ok" button is pressed, the field is parsed and if valid, it starts another activity. That is easy enough.

But, when the field is not valid, I want the soft keyboar开发者_运维问答d to stay open. And that's... a hell more complicated. If anyone know how to achieve such a thing...

Thanks in advance.

EDIT : what I mean by the OK button is the OK button from the soft keyboard.

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Attach OnEditorActionListener to your text field and return true from its onEditorAction method, when actionId is equal to IME_ACTION_DONE. This will prevent soft keyboard from hiding:

EditText txtEdit = (EditText) findViewById(R.id.txtEdit);
txtEdit.setOnEditorActionListener(new OnEditorActionListener() {

  public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
    if (actionId == EditorInfo.IME_ACTION_DONE) {
      // your additional processing... 
      return true;
    } else {
      return false;
    }
  }

});