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【简答题】
设计一个简单的计算器,输入两个操作数后能进行加减乘除运算,界面如右图所示。具体要求如下: ( 1 )按照下图所示,设计程序界面,界面布局自拟 ; ( 2 )编写 MainActivity.java 事件处理代码,要求输入两个操作数,点击各按完成相应的运算,并以 Toast 提示框显示计算结果;需要注意,除法运算时,要求判断输入是否为零,如果为零,则将该操作数默认置为“ 1 ”。
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