Making TextView scrollable on Android

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I am displaying text in a TextView that appears to be too long to fit
into one screen. I need to make my TextView scrollable. How can I do
that?

Here is the code:

final TextView tv = new TextView(this);
tv.setBackgroundResource(R.drawable.splash);
tv.setTypeface(face);
tv.setTextSize(18);
tv.setTextColor(R.color.BROWN);
tv.setGravity(Gravity.CENTER_VERTICAL| Gravity.CENTER_HORIZONTAL);
tv.setOnTouchListener(new OnTouchListener() {
    public boolean onTouch(View v, MotionEvent e) {
        Random r = new Random();
        int i = r.nextInt(101);
        if (e.getAction() == e.ACTION_DOWN) {
            tv.setText(tips[i]);
            tv.setBackgroundResource(R.drawable.inner);
        }
        return true;
    }
});
setContentView(tv);

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