下角标样式。

示例1：

SubscriptSpan subscriptSpan = new SubscriptSpan();

String text = "打开百度";
SpannableString spannableString = new SpannableString(text);
spannableString.setSpan(subscriptSpan, 2, text.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);

TextView textView = (TextView) findViewById(R.id.text_view);
textView.setText(spannableString);

示例2：

Parcel parcel = Parcel.obtain();
SubscriptSpan subscriptSpan = new SubscriptSpan(parcel);

String text = "打开百度";
SpannableString spannableString = new SpannableString(text);
spannableString.setSpan(subscriptSpan, 2, text.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);

TextView textView = (TextView) findViewById(R.id.text_view);
textView.setText(spannableString);

示例3：

重写updateDrawState(TextPaint textPaint)方法，修改文本样式：

SubscriptSpan subscriptSpan = new SubscriptSpan() {
    @Override
    public void updateDrawState(TextPaint textPaint) {
        super.updateDrawState(textPaint);
        textPaint.setColor(Color.argb(255, 54, 92, 124));
    }
};

String text = "打开百度";
SpannableString spannableString = new SpannableString(text);
spannableString.setSpan(subscriptSpan, 2, text.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);

TextView textView = (TextView) findViewById(R.id.text_view);
textView.setText(spannableString);