android shape 怎么在底部画横线

使用layer-list可以，画了两层

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< layer-list >              <!-- This is the line -->              < item  android:left = "8dp"  android:right = "8dp" >< shape >                      < solid  android:color = "@color/black"  />                  </ shape ></ item >              < item  android:bottom = "3dp" >< shape >                      < solid  android:color = "@color/white"  />                  </ shape ></ item >          </ layer-list >

优点 ：  可以控制宽度