Loop with delay period

问题

I have a TextView and I want each second to highlight another letter in the word.

For example: h e l l o - h e l l o - h e l l o - h e l l o - h e l l o

What I have done:

int i = 0;
String text;
Handler handler = new Handler();

public void spanText(String txt) {
    text = txt;
    for(int i=0; i<text.length(); i++) {
        handler.post(runnable);
    }

Runnable runnable = new Runnable() {
    @Override
    public void run() {
        Spannable spannable = Spannable.Factory.getInstance().newSpannable(text);
        StyleSpan style = new StyleSpan(Typeface.BOLD);
        spannable.setSpan(style, i, i+1, Spanned.SPAN_INCLUSIVE_INCLUSIVE);
        bestResult.setText(spannable, BufferType.SPANNABLE);
        i++;
        if(i < text.length())
            handler.postDelayed(runnable, 5000);
    }
};

Unfortunately it doesn't work and I can see only the last letter highlighted.

Thank you in advance.

回答1:

int i = 0;
String text;
Handler handler = new Handler();

public void spanText(String txt) {
    text = txt;
    handler.post(runnable);

Runnable runnable = new Runnable() {
    @Override
    public void run() {
        Spannable spannable = Spannable.Factory.getInstance().newSpannable(text);
        StyleSpan style = new StyleSpan(Typeface.BOLD);
        spannable.setSpan(style, i, i+1, Spanned.SPAN_INCLUSIVE_INCLUSIVE);
        bestResult.setText(spannable, BufferType.SPANNABLE);
        i++;
        if(i < text.length())
            handler.postDelayed(runnable, 5000);
    }
};

来源：https://stackoverflow.com/questions/17392046/loop-with-delay-period