Android - Generate Random no between x and y whose sum is m

I want to generate n no of random no whose sum should be m and these no should always be between x and y.

For eg :- If i say I need 20 no, between 3 and 9 inclusive, whose sum should be 100.

I want to specify the sum and required amount of no as well as the limit between which random no should be generated and it should give me the random no of specified amount. Below is my code which do generates no which are greater than 2 but i am not able to put the max limit. Also, the sum which comes out and the sum of no. which it generates is not equal to specified sum. I am totally confused Please help me out.

TextView textView,randomTotaltxt;
int count0 = 0;
int count1 = 0;
int targetSum = 100;
int numberofDraws = 20;

    textView = (TextView) findViewById(R.id.textview);
    randomTotaltxt = (TextView) findViewById(R.id.randomTptalText);

    Random r = new Random();
    ArrayList<Integer> load = new ArrayList<>();

    //random no
    int sum = 0;
    for (int i=0; i<numberofDraws;i++){
        int next = r.nextInt(targetSum)+1;
        Log.d("No",""+next);
        load.add(next);
        sum += next;
    }

    //scale it
    double scale = 1d*targetSum/sum;
    sum=0;
    for (int i=0; i<numberofDraws;i++){
        load.set(i, (int)(load.get(i)*scale));
        sum += load.get(i);
    }

   while (load.contains(0)|| load.contains(1)){
       for (int i=0; i<load.size();i++) {
           if (load.get(i).equals(0)) {
               load.set(i, load.get(i) + 2);
               count0++;
               sum = sum+1;
           }
           if (load.get(i).equals(1)) {
               load.set(i, load.get(i) + 2);
               sum += load.get(i);
               count1++;
              sum = sum+1;
           }
       }
   }

    // take rounding
    while (sum++ <targetSum){
        int i = r.nextInt(numberofDraws);
        load.set(i, load.get(i) + 1);
    }

    textView.setText(""+load);
    randomTotaltxt.setText(""+(sum-1));