Generating Unique Random number JAVA

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I'm trying to get shuffle character from String Question. But the character is repeated.

Random Method

public ArrayList<Integer> Random(int length) {
        ArrayList<Integer> list = new ArrayList<Integer>();
        for (int i=0; i<length; i++) {
            list.add(new Integer(i));
        }
        Collections.shuffle(list);
        return list;
    }

MainActivity

    strQuestion = c.getString("question");
    int length = strQuestion.length();
    str_buff.getChars(0, length, char_text, 0);

 for(int i=0;i<length;i++){
            int k = Random(length).get(i);
                TextView tv = new TextView(this);
                tv.setText(String.valueOf(char_text[k]));
                tv.setId(k);
                tv.setTextSize(30);
                tv.setBackgroundColor(0xff00ff00);
                tv.setPadding(5, 5, 5, 5);
                tv.setOnTouchListener(new MyTouchListener());
                layout.addView(tv);
        }

asked 34 secs ago

user3651158

3

Generating Unique Random number JAVA