片段onBackPress的问题 [英] problems with Fragment onBackPress
问题描述
在我的导航抽屉中有5个菜单项.其中一个与我们有关已经不见了,但是它的文本仍然留在我的活动中.我该如何解决这个问题?它与什么有关?!
in my navigation drawer there are 5 menu items.one of them is about us item.when I click on this item, I call AboutUsFragment and show it(its content is just a text).but when I click onBackPress, fragment is gone but its texts remains on my activity.how can I solve this problem?what`s it related to?!
在我的活动中选择导航抽屉项:
select item of navigation drawer in my activity:
public void selectItem(int position) {
Fragment fragment = null;
switch (position) {
case 0:
if (!Constants.login_state) {
fragment = new LoginFragment();
} else {
Logout();
}
break;
case 1:
Constants.filter = false;
Constants.gender = "-1";
fragment = new HomeFragment();
break;
case 2:
Constants.filter = false;
Constants.gender = "2";
StyleFragment.SortingMode = 1;
fragment = new StyleFragment();
break;
case 3:
Constants.filter = false;
Constants.gender = "1";
StyleFragment.SortingMode = 1;
fragment = new StyleFragment();
break;
case 4:
fragment = new AboutUsFragment();
break;
default:
break;
}
if (fragment != null) {
FragmentTransaction fragmentManager = getSupportFragmentManager().beginTransaction();
fragmentManager.replace(R.id.rl_container, fragment);
fragmentManager.addToBackStack(null);
fragmentManager.commit();
mDrawerList.setItemChecked(position, true);
mDrawerList.setSelection(position);
setTitle(mNavigationDrawerItemTitles[position]);
mDrawerLayout.closeDrawer(Gravity.END);
} else {
Log.e("HomeActivity", "Error in creating fragment");
}
}
和AboutUsFragment:
and AboutUsFragment:
public class AboutUsFragment extends android.support.v4.app.Fragment{
private View view;
private TextView about_us_fragment_text_view;
public static AboutUsFragment newInstance() {
AboutUsFragment fragment = new AboutUsFragment();
Bundle args = new Bundle();
fragment.setArguments(args);
return fragment;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
view=inflater.inflate(R.layout.fragment_about_us, container, false);
Casting(view);
about_us_fragment_text_view.setText(getResources().getString(R.string.about_us));
ChangeUIFont.ChangeFont((ViewGroup) view, getContext());
return view;
}
//casting parameters
public void Casting(View v){
about_us_fragment_text_view= (TextView) v.findViewById(R.id.about_us_fragment_text_view);
}}
onBackPress我的活动中:
onBackPress in my activity:
@Override
public void onBackPressed() {
if (SearchOpened) {
lv_searchResult.setVisibility(View.GONE);
SearchOpened = false;
} else
super.onBackPressed();
}
--------------------------------------- AfterSearching ------- ------------------------------------
---------------------------------------AfterSearching-------------------------------------------
最后我找到了解决方案!
Finally I found the solution!
在我的片段中,我添加了以下代码:
in my fragment I added below code:
public static final String FRAGMENT_NAME = AboutUsFragment.class.getName();
在我的活动中,我在调用片段时设置了片段的标签,而不是null!
and in my activity,I set the tag of fragment when I call it,instead of null!
fragmentManager.replace(R.id.rl_container, fragment,fragmentName);
推荐答案
使用此方法代替onBackPressed
used this method instead of onBackPressed
如果您有工具栏,那么这是我的解决方案, 在工具栏下面的oncreate方法下键入
if you have toolbar then here is my solution, type under the oncreate method below toolbar,
assert getSupportActionBar() != null;
// getSupportActionBar().setHomeButtonEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
并在清单文件中为您的片段设置此代码
and set this code in your manifest file for your fragment
<activity android:name=".yourCurrentFragment">
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value=".whichActivityYouWantToGo" />
</activity>
这篇关于片段onBackPress的问题的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!