Android - 如何在 fragment 类中访问操作栏的菜单项

Question

我应该如何访问 fragment 中操作栏的菜单项？ 我试过了，但什么也没发生

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // TODO Auto-generated method stub

    switch (item.getItemId()) {
    case R.id.menu_refresh:
        Toast.makeText(getActivity().getApplicationContext(), "clicked", Toast.LENGTH_SHORT).show();
        return true;
    default:
        return super.onOptionsItemSelected(item);
    }
}

@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    // TODO Auto-generated method stub
    super.onCreateOptionsMenu(menu, inflater);
}

Answer 1

按照以下步骤操作:

• 在 Fragment 中添加 setHasOptionsMenu(true) 方法。

• 覆盖 onCreateOptionsMenu(Menu menu, MenuInflater inflater) 和 fragment 中的 onOptionsItemSelected(MenuItem item) 方法。

• 在 onOptionsItemSelected(MenuItem item) Activity 的方法中， 确保在菜单项操作为时返回 false 在 onOptionsItemSelected(MenuItem item) Fragment 中实现 方法。

例子:

Activity

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getSupportMenuInflater();
    inflater.inflate(R.menu.main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case R.id.activity_menu_item:
        // Do Activity menu item stuff here
        return true;
    case R.id.fragment_menu_item:
        // Not implemented here
        return false;
    default:
        break;
    }

    return false;
}

fragment

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setHasOptionsMenu(true);
    ....
}

@Override
public void onCreateOptionsMenu(Menu menu,MenuInflater inflater) {
    // Do something that differs the Activity's menu here
    super.onCreateOptionsMenu(menu, inflater);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case R.id.activity_menu_item:
        // Not implemented here
        return false;
    case R.id.fragment_menu_item:
        // Do Fragment menu item stuff here
        return true;
    default:
        break;
    }

    return false;
}