我有一个带有FrameLayout和菜单的ActionBar活动。当用户点击菜单项时,我使用相关的新片段替换片段。然而,我无法看到一种明显的方法来删除所选片段的菜单项。
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
StudyFragment startFragment = new StudyFragment();
startFragment.setArguments(getIntent().getExtras());
getSupportFragmentManager().beginTransaction().add
(R.id.container, startFragment).commit();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
switch (id) {
case R.id.action_study:
replaceFragment((Fragment)new StudyFragment());
break;
case R.id.action_list:
replaceFragment((Fragment)new ListFragment());
break;
// etc
}
return super.onOptionsItemSelected(item);
}
private void replaceFragment(Fragment f) {
FragmentTransaction transaction =
getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.container, f);
transaction.addToBackStack(null);
transaction.commit();
}
谷歌有关更改菜单的文档中建议在onPrepareOptionsMenu中禁用菜单,但我如何知道哪个项目已被选中?
--已实施的解决方案--
使用Muhammed Refaat的解决方案,在类中添加了两个新成员。
private Menu activityMenu;
private MenuItem curMenuItem;
将它们设置在onCreateOptionsMenu中
activityMenu = menu;
curMenuItem = activityMenu.findItem(R.id.action_study);
curMenuItem.setVisible(false);
并在onOptionsItemSelected中进行更改
curMenuItem.setVisible(true);
curMenuItem = activityMenu.findItem(id);
curMenuItem.setVisible(false);