//strategy1是一个TextView

    SpannableStringBuilder builder1 = new SpannableStringBuilder(strategy1.getText().toString());

 //设置前景色为蓝色

        ForegroundColorSpan blue=new ForegroundColorSpan(Color.BLUE);

 //改变第0-3个字体颜色为蓝色

        builder1.setSpan(blue,0,3, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

 //改变第0-3个字体大小

        builder1.setSpan(new AbsoluteSizeSpan(55),0,3,Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

        strategy1.setText(builder1);