Question

When I’m pressing a key i want to execute an instruction and when I stop pressing the key i want to execute another instruction. (Like the buttons on the android making setOnClickListener -> instruction for example). You can do in Java with the keys?

Sorry for my bad english.

Answer 1

Your question is really hard to understand because you seem to be talking about keys and buttons at the same time. To detect that a button is pressed and then released you will need to override the onTouchEvent() method for the button. For keys/physical buttons on the device there are two methods to override:

public boolean onKeyDown(int keyCode, KeyEvent msg)
public boolean onKeyUp(int keyCode, KeyEvent msg)

update: a more detailed explanation

boolean bKeyIsPressed;

@Override public boolean onKeyDown(int keyCode, KeyEvent msg)
{
   switch (keyCode)
   {
     case THE_KEY_I_WANT:
        bKeyIsPressed = true;
        break;
   }
}

@Override public boolean onKeyUp(int keyCode, KeyEvent msg)
{
   switch (keyCode)
   {
     case THE_KEY_I_WANT:
        bKeyIsPressed = false;
        break;
   }
}