Why is onKey() called twice?

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I am using this code:

public boolean onKey(View v, int keyCode, KeyEvent event) {
msg = (EditText)findViewById(R.id.msg);
String message = msg.getText().toString();
            if(keyCode == 66)
            {
                //It's hitting here twice.          
            }
            return false;
        };

Can anyone please tell me why it's hitting twice when I press enter?

3 Answers
 itemView.setOnKeyListener(new View.OnKeyListener() {
  @Override
  public boolean onKey(View v, int keyCode, KeyEvent event) {
    int pos = getAdapterPosition();
    if (event.getAction() == KeyEvent.ACTION_DOWN && event.getKeyCode() == KeyEvent.KEYCODE_MENU){
     //code here
    }
    return false;
  }
 });
edittext.setOnKeyListener(new View.OnKeyListener() {
        @Override
        public boolean onKey(View view, int i, KeyEvent keyEvent) {
            if (keyEvent.getAction() == KeyEvent.ACTION_DOWN || keyEvent.getAction() == KeyEvent.ACTION_UP) {
                switch (i) {
                    case KeyEvent.KEYCODE_ENTER:
                        if (!HelperFunction.isStringEmpty(edittext.getText().toString())) {

                            if (loadCount == 0) {

                                loadCount ++;


                            }
                        }
                    default:
                        return false;
                }
            }
            return false;
        }

this code block prevents calling the code twice. I use loadCount String value , if loadCount == 0 run my code block and i am doing loadCount ++ in my if block. So My Code block work on time.

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