//得到TextView控件对象
TextView textView = (TextView)findViewById(R.id.custom);
//将字体文件保存在assets/fonts/目录下,创建Typeface对象
Typeface typeFace = Typeface.createFromAsset(getAssets(), "fonts/HandmadeTypewriter.ttf");
//应用字体
textView.setTypeface(typeFace);