Question

I am creating a runnable typewriter effect using a textview inside a scrollview.

this is what I did…

    final ScrollView sv = new ScrollView(this);
    sv.setLayoutParams(new LinearLayout.LayoutParams((int)display.getWidth()/2, (int)((display.getHeight()/4))*3));
    sv.setPadding(0, px2DP(10), px2DP(10), px2DP(10));

    final CharSequence text = getResources().getText(R.string.longstring);

    final TextView content = new TextView(this);
    content.setBackgroundColor(getResources().getColor(R.color.Black));
    content.setTextColor(getResources().getColor(R.color.White));
    content.setTextSize(TypedValue.COMPLEX_UNIT_SP,20);
    content.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT));

    sv.addView(content);

    content.postDelayed(new Runnable(){
        @Override
        public void run() {
            content.append(text.subSequence(0, index++));
            sv.fullScroll(View.FOCUS_DOWN);     
        }

    },70);

I am only getting a black box and no text.

What am I doing wrong? Please help.

PS. I already found the solution!

Answer 1

Solution found. I am using the handler-runnable concept wrong. Based on what Jonas pointed out, Runnable only runs once. Therefore a loop is necessary.

As suggested on this link:
How to run a Runnable thread in Android?

The answer is something similar to recursion.

Anyway thanks guys! Android is so cool.