自己做的计算器 思路跟老师差不多但是没有设置按钮参数都是用权重来做的  代码如下；

<LinearLayout
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:orientation="horizontal"
                    android:weightSum="3"
                    android:layout_marginTop="20dp" >

                    <Button
                        android:id="@+id/btn_0"
                        android:layout_width="fill_parent"
                        android:layout_height="wrap_content"
                       android:layout_weight="1"
                        android:gravity="bottom|right"
                        android:text="0" />

                    <Button
                        android:id="@+id/btn_point"
                        android:layout_width="fill_parent"
                        android:layout_height="wrap_content"
                        android:layout_weight="2"
                        android:gravity="bottom|right"
                        android:text="." />

那么问题来了 为啥0 和.权重设置和界面显示出来的相反 ？？？