15.Menu在活动中的使用

<menu xmlns:android="http://schemas.android.com/apk/res/android">    <item        android:id="@+id/add_item"        android:title="Add"/>    <item        android:id="@+id/remove_item"        android:title="Remove"/></menu>

public boolean onCreateOptionMenu(Menu menu){        getMenuInflater().inflate(R.menu.main,menu);        return true;    }

public boolean onOptionsItemSelected(MenuItem item){        switch (item.getItemId()){            case R.id.add_item:                Toast.makeText(this,"You clicked Add",Toast.LENGTH_SHORT).show();                break;            case R.id.remove_item:                Toast.makeText(this,"You clicked Remove",Toast.LENGTH_SHORT).show();                break;            default:        }        return true;    }