TextView动态改变部分内容和颜色

很简单的东西，怕自己记不住，记录一下~

核验人数共计:%1$s人
tv_count.setText(String.format(getString(R.string.title_total_record), count));
// 改变数字颜色
SpannableStringBuilder builder = new SpannableStringBuilder(tv_count.getText().toString());  
int start = 7;
int end = tv_count.getText().length() - 1;
//ForegroundColorSpan 为文字前景色，BackgroundColorSpan为文字背景色  
ForegroundColorSpan blueSpan = new ForegroundColorSpan(Color.BLUE);
builder.setSpan(blueSpan, start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);  
tv_count.setText(builder);