Android中EditText如何去除边框添加下划线

<span style="font-family: Arial, Helvetica, sans-serif;"><?xml version="1.0" encoding="utf-8"?> 
</span> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
> 
<!--注意名称 --> 
<com.marine.study.LineEditText 
android:id="@+id/myEdit" 
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 
style="?android:attr/textViewStyle" 
android:background="@null" 
android:textColor="@null" 
/> 
</LinearLayout> 

public class LineEditText extends EditText { 
// 画笔 用来画下划线 
private Paint paint; 
public LineEditText(Context context, AttributeSet attrs) { 
super(context, attrs); 
paint = new Paint(); 
paint.setStyle(Paint.Style.STROKE); 
paint.setColor(Color.RED); 
// 开启抗锯齿 较耗内存 
paint.setAntiAlias(true); 
} 
@Override 
protected void onDraw(Canvas canvas) { 
super.onDraw(canvas); 
// 得到总行数 
int lineCount = getLineCount(); 
// 得到每行的高度 
int lineHeight = getLineHeight(); 
// 根据行数循环画线 
for (int i = 0; i < lineCount; i++) { 
int lineY = (i + 1) * lineHeight; 
canvas.drawLine(0, lineY, this.getWidth(), lineY, paint); 
} 
} 
}