这段代码用途是什么？？

Question

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

}

Answer 1

onCreate Activity的生命周期第一步，创建。setContentView(R.layout.activity_main);加载你要的布局文件，也就是你看到的页面.onCreateOptionsMenu就菜单，你按手机menu按键时出现的那个菜单getMenuInflater().inflate(R.menu.main, menu);布局填充气，填充你自己设计的menu