Android - setOnKeyListener only works if I hold the button

Question

Well, I got an EditText on my adapter that I want to clear his focus when I press button back of the soft-key bar. But the problem is: it just works if I hold that button and not when I make it quickly. What am I supposed to do? Here's the code:

holder.comprimento.setOnKeyListener(View.OnKeyListener { v, keyCode, event ->
     if (keyCode == KeyEvent.KEYCODE_BACK) {
          v.clearFocus()
          return@OnKeyListener true
     }
     false
 })

Answer 1

Use KeyEvent.KEYCODE_DEL instead of KeyEvent.KEYCODE_BACK.

 holder.comprimento.setOnKeyListener(View.OnKeyListener { v, keyCode, event ->
 if (keyCode == KeyEvent.KEYCODE_DEL) {
      v.clearFocus()
      return@OnKeyListener true
 }
 false
 })

UPDATE KeyEvent will be triggered only with softkeyboard. https://developer.android.com/reference/android/view/View.OnKeyListener