[英]Android fragment toolbar text not changing
I am developing an app with Fragment
.我正在开发一个带有
Fragment
的应用程序。 When I open the Fragment
where not listed in navigation drawer.当我打开导航抽屉中未列出的
Fragment
。 For example, I have 8 fragments where 7 fragments is listed in navigation drawer and the other one is not listed ( Fragment
name is sub category Fragment
) in navigation drawer.例如,我有 8 个片段,其中 7 个片段在导航抽屉中列出,而另一个未在导航抽屉中列出(
Fragment
名称是子类别Fragment
)。 I can change toolbar title of 7 Fragment
using below code.我可以使用以下代码更改 7
Fragment
工具栏标题。 But I cannot change the toolbar tittle of Fragment
where not listed in navigation drawer.但是我无法更改导航抽屉中未列出的
Fragment
的工具栏标题。
My HomeActivity.java
我的
HomeActivity.java
public class HomeActivity extends AppCompatActivity implements FragmentDrawer.FragmentDrawerListener {
private Toolbar mToolbar;
private FragmentDrawer drawerFragment;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
mToolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(mToolbar);
getSupportActionBar().setDisplayShowHomeEnabled(true);
drawerFragment = (FragmentDrawer)
getSupportFragmentManager().findFragmentById(R.id.fragment_navigation_drawer);
drawerFragment.setUp(R.id.fragment_navigation_drawer, (DrawerLayout) findViewById(R.id.drawer_layout), mToolbar);
drawerFragment.setDrawerListener(this);
displayView(0);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public void onDrawerItemSelected(View view, int position) {
displayView(position);
}
public void displayView(int position) {
Fragment fragment = null;
String title = getString(R.string.app_name);
switch (position) {
case 0:
fragment = new HomeFragment();
title = getString(R.string.title_home);
Log.d("LOGTAG", "Home");
break;
case 1:
fragment = new CategoriesFragment();
title = getString(R.string.title_categories);
Log.d("LOGTAG", "Categories");
break;
case 2:
fragment = new MyOrdersFragment();
title = getString(R.string.title_myorders);
Log.d("LOGTAG", "My Orders");
break;
case 3:
fragment = new WalletFragment();
title = getString(R.string.title_wallet);
Log.d("LOGTAG", "Wallet");
break;
case 4:
fragment = new AccountSettingsFragment();
title = getString(R.string.title_account_settings);
Log.d("LOGTAG", "Account Settings");
break;
case 5:
fragment = new AboutUsFragment();
title = getString(R.string.title_aboutus);
Log.d("LOGTAG", "About Us");
break;
case 6:
fragment = new ContactUsFragment();
title = getString(R.string.title_contactus);
Log.d("LOGTAG", "Contact Us");
break;
case 7:
fragment = new LogOutFragment();
title = getString(R.string.title_logout);
Log.d("LOGTAG", "Log out");
break;
case 8:
fragment = new SubCategoryFragment();
title = getString(R.string.title_sub_categories);
Log.d("LOGTAG", "Sub Categories");
break;
default:
break;
}
if (fragment != null) {
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.container_body, fragment);
fragmentTransaction.commit();
// set the toolbar title
getSupportActionBar().setTitle(title);
}
}
public void loadFragment(int id, Fragment fragment) {
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(id, fragment, fragment.toString());
ft.addToBackStack(null);
ft.commit();
}
}
And the SubCategoryFragment.java
和
SubCategoryFragment.java
public class SubCategoryFragment extends android.support.v4.app.Fragment {
List<GetDataAdapter> GetDataAdapter1;
RecyclerView recyclerView;
RecyclerView.LayoutManager recyclerViewlayoutManager;
RecyclerView.Adapter recyclerViewadapter;
String GET_JSON_DATA_HTTP_URL;
String JSON_IMAGE_TITLE_NAME = "image_title";
String JSON_IMAGE_URL = "image_url";
String JSON_IMAGE_ID = "id";
JsonArrayRequest jsonArrayRequest ;
RequestQueue requestQueue ;
public SubCategoryFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_sub_category, container, false);
HomeActivity activity = new HomeActivity();
activity.displayView(8); //Occuring error
// Inflate the layout for this fragment
return rootView;
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
}
@Override
public void onDetach() {
super.onDetach();
}
}
When I add activity.displayView(8)
in sub category Fragment
it shows error.当我在子类别
Fragment
添加activity.displayView(8)
,它显示错误。
java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference
java.lang.NullPointerException:尝试在空对象引用上调用虚拟方法“android.content.res.Resources android.content.Context.getResources()”
So, how it possible to change Toolbar
text?那么,如何更改
Toolbar
文本?
you can use this你可以用这个
((AppCompatActivity)getActivity()).getSupportActionBar().setTitle("sub categories");
in place of代替
HomeActivity activity = new HomeActivity();
activity.displayView(8); //Occuring error
You can set title like this.您可以像这样设置标题。 In your subcategory fragment:
在您的子类别片段中:
Toolbar mtoolbar;工具栏 mtoolbar;
In oncreate view(){在 oncreate 视图(){
mtoolbar=(Toolbar)getActivity.findViewById(R.id.toolbarid); mtoolbar=(Toolbar)getActivity.findViewById(R.id.toolbarid);
setSupportAcrionbar(mtoolbar): setSupportAcrionbar(mtoolbar):
} }
Then in onActivityCreated(){然后在 onActivityCreated(){
((HomeActvity) getSupportAcrionbar.settitle("your title")); ((HomeActvity) getSupportAcrionbar.settitle("你的标题"));
} }
在 Kotlin 中,您可以使用以下内容:
(activity as AppCompatActivity).supportActionBar?.title = "Title here"
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