在for循环中暂停一下

Question

我在TextView中有一个文本，需要突出显示每个句子3秒钟。我尝试了Thraed计时器和handler.postDelayed。但是没有在循环中匆匆忙忙。

如何在FOR循环中实现延迟？

我的代码：

        Button btnPlay = (Button) findViewById(R.id.btnPlay);
    btnPlay.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {


            TextView txtMain = (TextView) findViewById(R.id.txtMain);
            String textString = txtMain.getText().toString();
            ArrayList<Integer> Sentences = new ArrayList<Integer>();

            // Save indexes of sentences in array
            Sentences.add(0);
            for (int i = 0; i < textString.length(); i++) {
                if (textString.charAt(i) == '.') {
                    Sentences.add(i);
                }
            }

            // Need 3 seconds delay at the end of this loop
            for (int j = 0; j < Sentences.size() - 1; j++) {
                Spannable spanText = Spannable.Factory.getInstance().newSpannable(textString);
                spanText.setSpan(new BackgroundColorSpan(0xFFFFFF00), Sentences.get(j), Sentences.get(j + 1), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
                txtMain.setText(spanText);
            }
        }

    });

提前致谢