android SpannableString

对于TextView的设置，有时候可能会遇到对一段话中的某一段文字进行设置，这时候就用到了SpannableString

/**
* 超链接
*/
private void addUrlSpan() {
    SpannableString spanString = new SpannableString("超链接");
    URLSpan span = new URLSpan("tel:0123456789");
    spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    tv.append(spanString);
}


/**
* 文字背景颜色
*/
private void addBackColorSpan() {
    SpannableString spanString = new SpannableString("颜色2");
    BackgroundColorSpan span = new BackgroundColorSpan(Color.YELLOW);
    spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    tv.append(spanString);
}


/**
* 文字颜色
*/
private void addForeColorSpan() {
    SpannableString spanString = new SpannableString("颜色1");
    ForegroundColorSpan span = new ForegroundColorSpan(Color.BLUE);
    spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    tv.append(spanString);
}


/**
* 字体大小
*/
private void addFontSpan() {
    SpannableString spanString = new SpannableString("36号字体");
    AbsoluteSizeSpan span = new AbsoluteSizeSpan(36);
    spanString.setSpan(span, 0, 5, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    tv.append(spanString);
}


/**
* 粗体，斜体
*/
private void addStyleSpan() {
    SpannableString spanString = new SpannableString("BIBI");
    StyleSpan span = new StyleSpan(Typeface.BOLD_ITALIC);
    spanString.setSpan(span, 0, 2, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    tv.append(spanString);
}


/**
* 删除线
*/
private void addStrikeSpan() {
    SpannableString spanString = new SpannableString("删除线");
    StrikethroughSpan span = new StrikethroughSpan();
    spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    tv.append(spanString);
}

/**
* 下划线
*/
private void addUnderLineSpan() {
    SpannableString spanString = new SpannableString("下划线");
    UnderlineSpan span = new UnderlineSpan();
    spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    tv.append(spanString);
}



/**
* 图片
*/
private void addImageSpan() {
    SpannableString spanString = new SpannableString(" ");
    Drawable d = getResources().getDrawable(R.drawable.ic_launcher);
    d.setBounds(0, 0, d.getIntrinsicWidth(), d.getIntrinsicHeight());
    ImageSpan span = new ImageSpan(d, ImageSpan.ALIGN_BASELINE);
    spanString.setSpan(span, 0, 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    tv.append(spanString);
}