Android: 100 - Random number instead the 100 became random

Im trying to subtract 100 and a random number but instead the 100 became a random number itself.
Below is a block of code which I used to generate random number and subtract the life which is a 100. Where did I go wrong I really thought my do-while statement works

public void run() {
  Random r1 = new Random();
  Random r2 = new Random();
  int n1 = r1.nextInt(10 - 1) + 1;
  int n2 = r2.nextInt(10 - 1) + 1;
  damage1.setText(String.valueOf(n1));
  damage2.setText(String.valueOf(n2));

  int life1 = 100, life2 = 100;

  if(life1 == 0 || life2 == 0){

      gameOver();

  } else {

      do {
          bar2.setProgress(life1);
          percent2.setText(String.valueOf(life1));
          life1-=n1;
      }
      while(life1 > 0);

      do {
          bar1.setProgress(life2);
          percent1.setText(String.valueOf(life2));
          life2-=n2;
      }
      while(life2 > 0);

  }
}