I am trying to add a fragment, then find a view inside said fragment, and add a view into it. However I keep getting a NullPointerException on this statement
FrameLayout container2 = (FrameLayout) fragment.getActivity().findViewById(R.id.content_frame);
Here is my code. Can someone tell me how to fix this please? thanks
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
Fragment fragment = new FragmentNavigationDrawer();
ViewGroup decor = (ViewGroup) getActivity().getWindow().getDecorView();
View child = decor.getChildAt(0);
decor.removeView(child);
fragmentTransaction.add(decor.getId(), fragment);
fragmentTransaction.commit();
FrameLayout container2 = (FrameLayout) fragment.getActivity().findViewById(R.id.content_frame);
container2.addView(child);
Just use a getter. Set a tag on your fragment so you can access it later, then either call getView() on your fragment to return its root view, or use a getter to access a specific View:
public class MainActivity extends AppCompatActivity {
//In onCreate
if (getFragmentManager().findFragmentByTag(FragmentNavigationDrawer.TAG) == null) {
getFragmentManager()
.beginTransaction()
.add(android.R.id.content, new FragmentNavigationDrawer(), FragmentNavigationDrawer.TAG)
.commit();
}
//Later, when you want to add said View:
FragmentNavigationDrawer frag =
(FragmentNavigationDrawer) getFragmentManager().findFragmentByTag(FragmentNavigationDrawer.TAG)
//Return the root view:
View fragRootView = frag.getView();
//Return a specific view:
frag.getUpdatableViewGroup().addView(newViewToAdd):
}
For your Fragment:
public class FragmentNavigationDrawer extends Fragment {
public static final String TAG = FragmentNavigationDrawer.class.getSimpleName();
FrameLayout updatableViewGroup;
//Can do this inside onCreateView() whilst inflating your Fragment's Views
//That's up to you.
#Override
public void onViewCreated (View view, Bundle savedInstanceState) {
updateableViewGroup = view.findViewById(R.id.updateable_view_group);
}
public FrameLayout getUpdatableViewGroup() {
return updateableViewGroup;
}
Be conscious of the Activity and Fragment life cycles however, and be careful not to attempt to access the Fragment's Views until they have finished inflating - onStart() of your Activity and later should be ok.
Please see the javadoc for FragmentTransaction.commit(). It says it will schedule a change to the fragment back stack. It doesn't happen immediately. It looks like you're expecting the fragment and its views to be instantly available.
Also, I'm really confused why you're reaching in a decor view to make changes. Usually you call out a view by id in the host activity's layout and make changes inside it.
I am trying to access the parent viewpager from inside a fragment, but i have no idea how to do that.
I need to switch the currentItem on the ViewPager after a onClick event inside the fragment.
Any ideas?
EDIT:
I want access to the parent view(ViewPager View) so that i can change the currentItem which is visible, from inside one of my fragments.
From fragment, call getActivity() which will gives you the activity in which the fragment is hosted. Then call findViewById(ViewPagerId) to get the ViewPager.
ViewPager vp=(ViewPager) getActivity().findViewById(ViewPagerId);
Edit: I must add, even though Eldhose answer's works, I would defend my approach. Because the less the fragment knows about the Activity containing it, the better. By doing this, you can get the parent view without depending on IDs, and you can still get information from it even if it isn't a ViewPager.
You can get the in the Fragment's onCreateView method.
The container param is the parent View, in that case, a ViewPager.
In Java:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
ViewPager pager = (ViewPager) container;
//.... Rest of your method
}
Kotlin Version:
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup,
savedInstanceState: Bundle) {
val pager = container as ViewPager
//.... Rest of your method
}
The methods onCreateView and onViewCreated and onAttach are called too early.
The view is definitely attached to its parent view in the fragment's onResume method. This is a good place to then use getView().getParent()
Another way that helped me :
List<Fragment> fragment = getActivity().getSupportFragmentManager().getFragments();
for (Fragment f:fragment) {
if (f instanceof CreatCheckInFragment){
((ParentFragment) f).viewPager.arrowScroll(View.FOCUS_LEFT);
}
}
I have a fragment I am trying to add into a view.
FragmentManager fragMgr=getSupportFragmentManager();
feed_parser_activity content = (feed_parser_activity)fragMgr
.findFragmentById(R.id.feedContentContainer);
FragmentTransaction xaction=fragMgr.beginTransaction();
if (content == null || content.isRemoving()) {
content=new feed_parser_activity(item.getLink().toString());
xaction
.add(R.id.feedContentContainer, content)
.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN)
.addToBackStack(null)
.commit();
Log.e("Abstract", "DONE");
}
When this code is executed I get the following error in debug..
java.lang.IllegalArgumentException: No view found for id 0x7f080011
for fragment feed_parser_activity{41882f50 #2 id=0x7f080011}
feed_parser_activity is a Fragment that is set to Fragment layout in xml.
I am using a FragmentActivity to host the Fragment Layout holding the feed_parser_layout.
Am I coding this correctly above?
I was having this problem too, until I realized that I had specified the wrong layout in setContentView() of the onCreate() method of the FragmentActivity.
The id passed into FragmentTransaction.add(), in your case R.id.feedContentContainer, must be a child of the layout specified in setContentView().
You didn't show us your onCreate() method, so perhaps this is the same problem.
This error also occurs when having nested Fragments and adding them with getSupportFragmentManager() instead of getChildFragmentManager().
The solution was to use getChildFragmentManager()
instead of getFragmentManager()
when calling from a fragment. If you are calling the method from an activity, then use getFragmentManager().
That will solve the problem.
Another scenario I have met.
If you use nested fragments, say a ViewPager in a Fragment with it's pages also Fragments.
When you do Fragment transaction in the inner fragment(page of ViewPager), you will need
FragmentManager fragmentManager = getActivity().getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
getActivity() is the key here.
...
I had this problem (when building my UI in code) and it was caused by my ViewPager (that showed Fragments) not having an ID set, so I simply used pager.setID(id) and then it worked.
This page helped me figure that out.
In my case I was trying to show a DialogFragment containing a pager and this exception was thrown when the FragmentPagerAdapter attempted to add the Fragments to the pager. Based on howettl answer I guess that it was due to the Pager parent was not the view set in setContentView() in my FragmentActivity.
The only change I did to solve the problem was to create the FragmentPagerAdapter passing in a FragmentMager obtained by calling getChildFragmentManager(), not the one obtained by calling getFragmentManager() as I normally do.
public class PagerDialog extends DialogFragment{
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.pager_dialog, container, false);
MyPagerAdapter pagerAdapter = new MyPagerAdapter(getChildFragmentManager());
ViewPager pager = (ViewPager) rootView.findViewById(R.id.pager);
pager.setAdapter(pagerAdapter);
return rootView;
}
}
This exception can also happen if the layout ID which you are passing to FragmentTransaction.replace(int ID, fragment) exists in other layouts that are being inflated. Make sure the layout ID is unique and it should work.
With Nested fragments
For me by using getChildFragmentManager() instead of getActivity().getSupportFragmentManager() resolved crash
java.lang.IllegalArgumentException: No view found for id
An answer I read on another thread similar to this one that worked for me when I had this problem involved the layout xml.
Your logcat says "No view found for id 0x7f080011".
Open up the gen->package->R.java->id and then look for id 0x7f080011.
When I had this problem, this id belonged to a FrameLayout in my activity_main.xml file.
The FrameLayout did not have an ID (there was no statement android:id = "blablabla").
Make sure that all of your components in all of your layouts have IDs, particularly the component cited in the logcat.
I got this error when I upgraded from com.android.support:support-v4:21.0.0 to com.android.support:support-v4:22.1.1.
I had to change my layout from this:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/container_frame_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
To this:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:id="#+id/container_frame_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
</FrameLayout>
So the layout MUST have a child view. I'm assuming they enforced this in the new library.
I know this has already been answered for one scenario, but my problem was slightly different and I thought I'd share in case anybody else is in my shoes.
I was making a transaction within onCreate(), but at this point the view tree has not been inflated so you get this same error. Putting the transaction code in onResume() made everything run fine.
So just make sure your transaction code runs after the view tree has been inflated!
I was facing a Nasty error when using Viewpager within Recycler View.
Below error I faced in a special situation.
I started a fragment which had a RecyclerView with Viewpager (using FragmentStatePagerAdapter). It worked well until I switched to different fragment on click of a Cell in RecyclerView, and then navigated back using Phone's hardware Back button and App crashed.
And what's funny about this was that I had two Viewpagers in same RecyclerView and both were about 5 cells away(other wasn't visible on screen, it was down). So initially I just applied the Solution to the first Viewpager and left other one as it is (Viewpager using Fragments).
Navigating back worked fine, when first view pager was viewable . Now when i scrolled down to the second one and then changed fragment and came back , it crashed (Same thing happened with the first one). So I had to change both the Viewpagers.
Anyway, read below to find working solution.
Crash Error below:
java.lang.IllegalArgumentException: No view found for id 0x7f0c0098 (com.kk:id/pagerDetailAndTips) for fragment ProductDetailsAndTipsFragment{189bcbce #0 id=0x7f0c0098}
Spent hours debugging it. Read this complete Thread post till the bottom applying all the solutions including making sure that I am passing childFragmentManager.
Nothing worked.
Finally instead of using FragmentStatePagerAdapter , I extended PagerAdapter and used it in Viewpager without Using fragments. I believe some where there is a BUG with nested fragments. Anyway, we have options. Read ...
Below link was very helpful :
Viewpager Without Fragments
Link may die so I am posting my implemented Solution here below:
public class ScreenSlidePagerAdapter extends PagerAdapter {
private static final String TAG = "ScreenSlidePager";
ProductDetails productDetails;
ImageView imgProductImage;
ArrayList<Imagelist> imagelists;
Context mContext;
// Constructor
public ScreenSlidePagerAdapter(Context mContext,ProductDetails productDetails) {
//super(fm);
this.mContext = mContext;
this.productDetails = productDetails;
}
// Here is where you inflate your View and instantiate each View and set their values
#Override
public Object instantiateItem(ViewGroup container, int position) {
LayoutInflater inflater = LayoutInflater.from(mContext);
ViewGroup layout = (ViewGroup) inflater.inflate(R.layout.product_image_slide_cell,container,false);
imgProductImage = (ImageView) layout.findViewById(R.id.imgSlidingProductImage);
String url = null;
if (imagelists != null) {
url = imagelists.get(position).getImage();
}
// This is UniversalImageLoader Image downloader method to download and set Image onto Imageview
ImageLoader.getInstance().displayImage(url, imgProductImage, Kk.options);
// Finally add view to Viewgroup. Same as where we return our fragment in FragmentStatePagerAdapter
container.addView(layout);
return layout;
}
// Write as it is. I don't know much about it
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
/*super.destroyItem(container, position, object);*/
}
// Get the count
#Override
public int getCount() {
int size = 0;
if (productDetails != null) {
imagelists = productDetails.getImagelist();
if (imagelists != null) {
size = imagelists.size();
}
}
Log.d(TAG,"Adapter Size = "+size);
return size;
}
// Write as it is. I don't know much about it
#Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
}
Hope this was helpful !!
Just in case someone's made the same stupid mistake I did; check that you're not overwriting the activity content somewhere (i.e. look for additional calls to setContentView)
In my case, due to careless copy and pasting, I used DataBindingUtil.setContentView in my fragment, instead of DataBindingUtil.inflate, which messed up the state of the activity.
I had the same issue but my issue was happenning on orientation change. None of the other solutions worked. So it turns out that I forgot to remove setRetainInstance(true); from my fragments, when doing a two or one pane layout based on screen size.
My mistake was on the FragamentTransaction.
I was doing this t.replace(R.layout.mylayout); instead of t.replace(R.id.mylayout);
The difference is that one is the layout and the other is a reference to the layout(id)
This happens when you are calling from a fragment inside another one.
use :
getActivity().getSupportFragmentManager().beginTransaction();
I had this same issue, let me post my code so that you can all see it, and not do the same thing that I did.
#Override
protected void onResume()
{
super.onResume();
fragManager = getSupportFragmentManager();
Fragment answerPad=getDefaultAnswerPad();
setAnswerPad(answerPad);
setContentView(R.layout.abstract_test_view);
}
protected void setAnswerPad(AbstractAnswerFragment pad)
{
fragManager.beginTransaction()
.add(R.id.AnswerArea, pad, "AnswerArea")
.commit();
fragManager.executePendingTransactions();
}
Note that I was setting up fragments before I setContentView. Ooops.
This page seems to be a good central location for posting suggestions about the Fragment IllegalArgumentException. Here is one more thing you can try. This is what finally worked for me:
I had forgotten that I had a separate layout file for landscape orientation. After I added my FrameLayout container there, too, the fragment worked.
On a separate note, if you have already tried everything else suggested on this page (and the entire Internet, too) and have been pulling out your hair for hours, consider just dumping these annoying fragments and going back to a good old standard layout. (That's actually what I was in the process of doing when I finally discovered my problem.) You can still use the container concept. However, instead of filling it with a fragment, you can use the xml include tag to fill it with the same layout that you would have used in your fragment. You could do something like this in your main layout:
<FrameLayout
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<include layout="#layout/former_fragment_layout" />
</FrameLayout>
where former_fragment_layout is the name of the xml layout file that you were trying to use in your fragment. See Re-using Layouts with include for more info.
I fixed this bug, I use the commitNow() replace commit().
mFragment.getChildFragmentManager()
.beginTransaction()
.replace(R.id.main_fragment_container,fragment)
.commitNowAllowingStateLoss();
The commitNow is a sync method, the commit() method is an async method.
I use View Binding in my project and was inattentive to add setContentView() after inflating ActivityHelloWorldBinding class:
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityHelloWorldBinding.inflate(layoutInflater)
// Add this line.
setContentView(binding.root)
}
In my case I had a SupportMapFragment in a recycler view item (I was using the lower overhead "liteMode" which makes the map appear as non-interactive, almost like a static image). I was using the correct FragmentManager, and everything appeared to work fine... with a small list. Once the list of items exceeded the screen height by a bit then I started getting this issue when scrolling.
Turned out, it was because I was injecting a dynamic SupportMapFragment inside a view, which was inside another fragment, to get around some issues I was having when trying to declare it statically in my XML. Because of this, the fragment placeholder layout could only be replaced with the actual fragment once the view was attached to the window, i.e. visible on screen. So I had put my code for initialising the SupportMapFragment, doing the Fragment replace, and calling getMapAsync() in the onAttachedToWindow event.
What I forgot to do was ensure that my code didn't run twice. I.e. in onAttachedToWindow event, check if my dynamic SupportMapFragment was still null before trying to create a new instance of it and do a Fragment replace. When the item goes off the top of the RecyclerView, it is detached from the window, then reattached when you scroll back to it, so this event is fired multiple times.
Once I added the null check, it happened only once per RecyclerView item and issue went away! TL;DR!
This issue also happens when you don't put <include layout="#layout/your_fragment_layout"/> in your app_bar_main.xml
use childFragmentManager instead of activity!!.supportFragmentManager
I encountered this problem when I tried to replace view with my fragment in onCreateView(). Like this:
public class MyProjectListFrag extends Fragment {
private MyProjectListFragment myProjectListFragment;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
FragmentManager mFragmentManager = getFragmentManager();
myProjectListFragment = new MyProjectListFragment();
mFragmentManager
.beginTransaction()
.replace(R.id.container_for_my_pro_list,
myProjectListFragment, "myProjectListFragment")
.commit();
}
It told me
11-25 14:06:04.848: E/AndroidRuntime(26040): java.lang.IllegalArgumentException: No view found for id 0x7f05003f (com.example.myays:id/container_for_my_pro_list) for fragment MyProjectListFragment{41692f40 #2 id=0x7f05003f myProjectListFragment}
Then I fixed this issue with putting replace into onActivityCreated(). Like this:
public class MyProjectListFrag extends Fragment {
private final static String TAG = "lch";
private MyProjectListFragment myProjectListFragment;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater
.inflate(R.layout.frag_my_project_list, container, false);
}
#Override
public void onActivityCreated(#Nullable Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onActivityCreated(savedInstanceState);
FragmentManager mFragmentManager = getFragmentManager();
myProjectListFragment = new MyProjectListFragment();
mFragmentManager
.beginTransaction()
.replace(R.id.container_for_my_pro_list,
myProjectListFragment, "myProjectListFragment")
.commit();
}
You have to return a view in onCreateView() so that you can replace it later
You can put any operation towards this view in the following function in fragment liftcycle, like onActivityCreated()
Hope this helps!
In my case this exception was thrown when I used different ids for the same layout element (fragment placeholder) while having several of them for different Build Variants. For some reason it works perfectly well when you are replacing fragment for the first time, but if you try to do it again you get this exception.
So be sure you are using the same id if you have multiple layouts for different Build Variants.
I was having this problem. In my case I have forgotten to add FrameLayout in my Xml File, after adding frame layout, my problem has been solved.
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/wraper"
android:layout_above="#id/wraper"/>
If you are trying to replace a fragment within a fragment with the fragmentManager but you are not inflating the parent fragment that can cause an issue.
In BaseFragment.java OnCreateView:
if (savedInstanceState == null) {
getFragmentManager().beginTransaction()
.replace(R.id.container, new DifferentFragment())
.commit();
}
return super.onCreateView(inflater, container, savedInstanceState);
Replace super.onCreateView(inflater, container, savedInstanceState);
with inflating the correct layout for the fragment:
return inflater.inflate(R.layout.base_fragment, container, false);
I've had the same problem when was doing fragment transaction while activity creation.
The core problem is what Nick has already pointed out - view tree has not been inflated yet. But his solution didn't work - the same exception in onResume, onPostCreate etc.
The solution is to add callback to container fragment to signal when it's ready:
public class MyContainerFragment extends Fragment {
public static interface Callbacks {
void onMyContainerAttached();
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
Log.d(TAG, "--- onAttach");
((Callbacks) activity).onMyContainerAttached();
}
//... rest of code
}
And then in activity:
public class MainActivity extends Activity
implements MyContainerFragment.Callbacks
{
#Override
public void onMyContainerAttached() {
getFragmentManager()
.beginTransaction()
.replace(R.id.containerFrame, new MyFragment())
.commit();
}
//...
}
In my case, i was using a fragment class file to declare a listview adapter class.
I just used a different file for the public adapter class and the error was gone.
It happens also when you have two views in two fragments with the same ids