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计算器的布局设计，用layout布局界面的格式。用网格布局的格式设计计算器按键模式。

菜单布局 public boolean onCreateOptionsMenu Menu menu { Inflate the menu; this adds items to the action bar if it is present getMenuInflater inflate R men

public boolean onOptionsItemSelected MenuItem item { Handle action bar item clicks here The action bar will automatically handle clicks on the Home Up