Android之Menu的操作

在res/menu下建立一个menu画布:

mune.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >
      
    <item android:id="@+id/help"
        android:title="帮助"
    />
    <item android:id="@+id/our"
        android:title="联系我们"/>
   

</menu>

public class MainActivity extends Activity {

 private static final int OK=1;
 private static final int CANCLE=2;
 private static final int ABOUT=3;
 
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
@Override
 public boolean onPrepareOptionsMenu(Menu menu)
{
 menu.add(0, OK, 0, "开始");
 menu.add(0, CANCLE, 0, "取消");
 Menu file=menu.addSubMenu(0,ABOUT,0,"关于");
 MenuInflater inflater=getMenuInflater();
 inflater.inflate(R.menu.mune, file);
 return true;
 
 
}
@Override
 public boolean onOptionsItemSelected(MenuItem item)
{
 switch(item.getItemId())
 {
 case OK:
  this.setTitle("开始");
  return true;
 case CANCLE:
  this.setTitle("取消");
  return true;
 case ABOUT:
  this.setTitle("关于");
  return true;
 case R.id.help:
  this.setTitle("帮助信息");
  return true;
 case R.id.our:
  this.setTitle("联系我们");
  return true;
 }
 return false;
}
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
}