Android : setting text of text view in java -android

So I don't get any compiler errors but when I press the button that calls the method the app crashes. I'm just trying set the text of the text view to the variable level.

Activity:

public void newGame(View view){
    int level=1;
    int XP=0;
    TextView ltxt = (TextView) findViewById(R.id.trainLvl);
    ltxt.setText(level);
}