TextView 设置下划线

 //下划线 

textView.getPaint().setFlags(Paint. UNDERLINE_TEXT_FLAG );

//抗锯齿

textView.getPaint().setAntiAlias(true);

//中划线
textview.getPaint().setFlags(Paint. STRIKE_THRU_TEXT_FLAG); 

// 设置中划线并加清晰 
textview.setFlags(Paint. STRIKE_THRU_TEXT_FLAG|Paint.ANTI_ALIAS_FLAG);  

//字体加粗

textView.getPaint().setFakeBoldText(true);

如需取消设置可以调用

textView.getPaint().setFlags(0);