Android TextView部分字体变色或字体变大小

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A. 

SpannableStringBuilder style=new SpannableStringBuilder(str);
//SpannableStringBuilder实现CharSequence接口
style.setSpan(new ForegroundColorSpan(Color.RED), 0, 2,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE );
style.setSpan(new ForegroundColorSpan(Color.YELLOW), 2, 4,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE );
style.setSpan(new ForegroundColorSpan(Color.GREEN), 4, 6,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE );
tv.setText(style);//将其添加到tv中 


String html = "预计收益<font color='#ff0000'>"+et_buy_sum.getText().toString()+"</font>";tv_profit_think.setText(Html.fromHtml(html));






B


TextView textView1 = (TextView) findViewById(R.id.textView1);        TextView textView2 = (TextView) findViewById(R.id.textView2);        TextView textView3 = (TextView) findViewById(R.id.textView3);        TextView textView4 = (TextView) findViewById(R.id.textView4);        //两次加大字体,设置字体为红色(big会加大字号,font可以定义颜色)        textView1.setText(Html.fromHtml("北京市发布霾黄色预警,<font color='#ff0000'><big><big>外出携带好</big></big></font>口罩"));        //设置字体大小为3级标题,设置字体为红色        textView2.setText(Html.fromHtml("北京市发布霾黄色预警,<h3><font color='#ff0000'>外出携带好</font></h3>口罩"));        //设置字体大小为58(单位为物理像素),设置字体为红色,字体背景为黄色        textView3.setText("北京市发布霾黄色预警,外出携带好口罩");        Spannable span = new SpannableString(textView3.getText());        span.setSpan(new AbsoluteSizeSpan(58), 11, 16, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);        span.setSpan(new ForegroundColorSpan(Color.RED), 11, 16, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);        span.setSpan(new BackgroundColorSpan(Color.YELLOW), 11, 16, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);        textView3.setText(span);        //两次缩小字体,设置字体为红色(small可以减小字号)        textView4.setText(Html.fromHtml("北京市发布霾黄色预警,<font color='#ff0000'><small><small>外出携带好</small></small></font>口罩"));

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