findViewById in Fragment

Question

I am trying to create an ImageView in a Fragment which will refer to the ImageView element which I have created in the XML for the Fragment  However  the findViewById method only works if I extend an Activity class  Is there anyway of which I can use it in Fragment as well   public class TestClass extends Fragment       public View onCreateView LayoutInflater inflater  ViewGroup container  Bundle savedInstanceState            ImageView imageView    ImageView findViewById R id my image           return inflater inflate R layout testclassfragment  container  false             The findViewById method has an error on it which states that the method is undefined

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Using getView   returns the view of the fragment  then you can call findViewById   to access any view element in the fragment view

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You need to inflate the Fragment s view and call findViewById   on the View it returns   public View onCreateView LayoutInflater inflater                            ViewGroup container                            Bundle savedInstanceState         View view   inflater inflate R layout testclassfragment  container  false        ImageView imageView    ImageView  view findViewById R id my image        return view

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The best way to implement this is as follows       public View onCreateView LayoutInflater inflater  ViewGroup container  Bundle savedInstanceState     rootView   inflater inflate R layout testclassfragment  container  false           ImageView imageView    ImageView  rootView findViewById R id my image           return rootView     In this way  the rootView can be used for each control defined in the xml layout and the code is much cleaner in this way   Hope this helps

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1  first inflate layout of Fragment then you can  use findviewbyId    View view   inflater inflate R layout testclassfragment  container  false                ImageView imageView    ImageView  view findViewById R id my image                return view

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EditText name    EditText  getView   findViewById R id editText1   EditText add    EditText  getView   findViewById R id editText2

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Try this it works for me   public class TestClass extends Fragment       private ImageView imageView       public View onCreateView LayoutInflater inflater  ViewGroup container  Bundle savedInstanceState            View view   inflater inflate R layout testclassfragment  container  false           findViews view           return view             private void findViews View view            imageView    ImageView  view findViewById R id my image

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Timing of transaction after  commit   may also cause this issue I got the same issue  View in a  Fragment could not be reached   The reason turned out to be  that - immediately after  FragmentTransaction  commit   -  the  View had not been activated in the UI  There is no guarantee when  after  commit    the transaction takes place  it s only queued  So I added a  FragmentManager  executePendingTransactions   to force the transaction to be done  After that  referencing the View works as expected

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getView   will give the root view  View v   getView   findViewByID R id x

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The easiest way to use such things is to use butterknife By this you can add as many Onclciklisteners just by  OnClick   as described below   public class TestClass extends Fragment        BindView R id my image  ImageView imageView       OnClick R id my image      public void my image click            yourMethod              public View onCreateView LayoutInflater inflater  ViewGroup container  Bundle savedInstanceState            View view inflater inflate R layout testclassfragment  container  false           ButterKnife bind getActivity view           return view

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Inside onCreateView method  1  first you have to inflate the layout view you want to add eg  LinearLayout  LinearLayout ll   inflater inflate R layout testclassfragment  container  false     2  Then you can find your imageView id from layout  ImageView imageView    ImageView ll findViewById R id my image     3 return the inflated layout  return ll

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According to the documentation on API level 11  Reference  in Back Stack http   developer android com reference android app Fragment html  short code         The Fragment s UI is just a simple text view showing its    instance number       Override public View onCreateView LayoutInflater inflater  ViewGroup container          Bundle savedInstanceState        View v   inflater inflate R layout hello world  container  false       View tv   v findViewById R id text         TextView tv  setText  Fragment      mNum       tv setBackgroundDrawable getResources   getDrawable android R drawable gallery thumb        return v

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You can call findViewById   with the Activity Object you get inside your public void onAttach Activity activity  method inside your Fragment   Save the Activity into a variable for example   In the Fragment class  private Activity mainActivity  In the onAttach   method  this mainActivity activity   Finally execute every findViewById through the vairable  mainActivity findViewById R id TextView

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Note    From API Level 26  you also don t need to specifically cast the result of findViewById as it uses inference for its return type   So now you can simply do   public View onCreateView LayoutInflater inflater                            ViewGroup container                            Bundle savedInstanceState         View view   inflater inflate R layout testclassfragment  container  false        ImageView imageView    view findViewById R id my image     without casting the return type      return view

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There is one more method called onViewCreated    Override public void onViewCreated View view   Nullable Bundle savedInstanceState        super onViewCreated view  savedInstanceState       ImageView imageView    ImageView  view findViewById R id imageview1

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You could also do it in the onActivityCreated Method    public void onActivityCreated Bundle savedInstanceState           super onActivityCreated savedInstanceState       Like they do here  http   developer android com reference android app Fragment html  deprecated in API level 28   getView   findViewById R id foo     and  getActivity   findViewById R id foo     are possible

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Use gradle skeleton plugin  it will automatically generate the view holder classes with the reference to your layout   public class TestClass extends Fragment       public View onCreateView LayoutInflater inflater  ViewGroup container  Bundle savedInstanceState            MyLayout myLayout   new MyLayout inflater  container  false           myLayout myImage setImageResource R drawable myImage           return myLayout view            Now assuming you had an ImageView declared in your my layout xml file  it will automatically generate myLayout class for you

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You have to inflate the view  public class TestClass extends Fragment    public View onCreateView LayoutInflater inflater  ViewGroup container  Bundle savedInstanceState        View v   inflater inflate R layout testclassfragment  container  false       ImageView imageView    ImageView v findViewById R id my image       return v

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Use getView   or the View parameter from implementing the  onViewCreated method  It returns the root view for the fragment  the one returned by onCreateView   method   With this you can call findViewById      Override public void onViewCreated View view   Nullable Bundle savedInstanceState        ImageView imageView    ImageView  getView   findViewById R id foo          or   ImageView  view findViewById R id foo      As getView   works only after onCreateView    you can t use it inside onCreate   or onCreateView   methods of the fragment

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Use   imagebutton    ImageButton  getActivity   findViewById R id imagebutton1    imageview    ImageView  getActivity   findViewById R id imageview1     it will work

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agreed with calling findViewById   on the View   public View onCreateView LayoutInflater inflater  ViewGroup container  Bundle savedInstanceState        View V   inflater inflate R layout testclassfragment  container  false       ImageView imageView    ImageView  V findViewById R id my image        return V

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Very simple way to do       Nullable          Override         public View onCreateView  NonNull LayoutInflater inflater   Nullable ViewGroup container   Nullable Bundle savedInstanceState                View fragmentView   inflater inflate R layout testclassfragment  container  false               ImageView imageView    ImageView fragmentView findViewById R id my image               return fragmentView

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1  Declare your layout file       public View onCreateView LayoutInflater inflater ViewGroup container                                    Bundle savedInstanceState        return inflate R layout myfragment  container  false       2 Then  get the id of your view    Override public void onViewCreated View view   Nullable Bundle savedInstanceState        super onViewCreated view  savedInstanceState       TextView nameView    TextView  view findViewById R id textview1

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Inside Fragment class you will get onViewCreated   override method where you should always initialize your views as in this method you get view object using which you can find your views like     Override public void onViewCreated View view  Bundle savedInstanceState        super onViewCreated view  savedInstanceState       view findViewById R id yourId  setOnClickListener this           or     getActivity   findViewById R id yourId  setOnClickListener this       Always remember in case of Fragment that onViewCreated   method will not called automatically if you are returning null or super onCreateView   from onCreateView   method  It will be called by default in case of ListFragment as ListFragment return FrameLayout by default   Note  you can get the fragment view anywhere in the class by using getView   once onCreateView   has been executed successfully   i e   getView   findViewById  your view id

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getView   works only after onCreateView   completed  so invoke it from onPostCreate      Override public void onPostCreate Bundle savedInstanceState        super onPostCreate savedInstanceState       ImageView imageView    ImageView  getView   findViewById R id foo

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You can override onViewCreated   which is called right after all views had been inflated  It s the right place to fill in your Fragment s member View variables  Here s an example   class GalleryFragment extends Fragment       private Gallery gallery                   Override     public void onViewCreated View view  Bundle savedInstanceState            gallery    Gallery  view findViewById R id gallery           gallery setAdapter adapter           super onViewCreated view  savedInstanceState

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Try This   View v   inflater inflate R layout testclassfragment  container  false   ImageView img    ImageView  v findViewById R id my image    return v

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Inside Fragment class we get onViewCreated   override method where we should always initialize our views because in this method we get view object  Using this object we can find our views like below   class MyFragment extends Fragment       private ImageView imageView        Override     public View onCreateView LayoutInflater inflater  ViewGroup container  Bundle savedInstanceState            return inflater inflate R layout my fragment layout  container  false               Override     public void onViewCreated View view  Bundle savedInstanceState            super onViewCreated view  savedInstanceState              initialize your view here for use view findViewById  your view id           imageView    ImageView  view findViewById R id my image

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public View onCreateView LayoutInflater inflater  ViewGroup container  Bundle savedInstanceState         View view   inflater inflate R layout testclassfragment  container  false        ImageView imageView    ImageView  view findViewById R id my image        return view      Notice if you use getView   method it might cause nullPointerException because it returns the rootview and it will be some view after onCreateView   method

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Get first the fragment view and then get from this view your ImageView   public View onCreateView LayoutInflater inflater  ViewGroup container  Bundle savedInstanceState        View view   inflater inflate R layout testclassfragment  container  false       ImageView imageView    ImageView  view findViewById R id my image       return view

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try  private View myFragmentView    Override public View onCreateView LayoutInflater inflater  ViewGroup container  Bundle savedInstanceState     myFragmentView   inflater inflate R layout myLayoutId  container  false   myView   myFragmentView findViewById R id myIdTag  return myFragmentView

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I realise this is an old question  but the prevailing answer leaves something to be desired   The question is not clear what is required of imageView - are we passing it back as the view  or merely saving a reference for later   Either way  if the ImageView is coming from the inflated layout  the correct way to do this would be   public class TestClass extends Fragment       public View onCreateView LayoutInflater inflater  ViewGroup container  Bundle savedInstanceState            View v   inflater inflate R layout testclassfragment  container  false           ImageView imageView    ImageView v findViewById R id my image           return v

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I like everything to be structured  You can do in this way  First initialize view private ImageView imageView   Then override OnViewCreated  Override     public void onViewCreated View view   Nullable Bundle savedInstanceState            super onViewCreated view  savedInstanceState           findViews view          Then add a void method to find views private void findViews View v        imageView   v findViewById R id img

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The method getView   wont work on fragments outside OnCreate and similar methods   You have two ways  pass the view to the function on the oncreate  what means you can only run your functions when the view is being created  or set the view as a variable   private View rootView    Override public View onCreateView LayoutInflater inflater  ViewGroup container      Bundle savedInstanceState        rootView   inflater inflate R layout fragment contatos  container  false      public void doSomething          ImageView thumbnail    ImageView  rootView findViewById R id someId

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In fragments we need a view of that window so that we make a onCreateView of this Fragment    Then get the view and use it to access each and every view id of that view elements      class Demo extends Fragment                Override         public View onCreateView final LayoutInflater inflater ViewGroup container  Bundle savedInstanceState                        View view  inflater inflate R layout demo fragment  container false               ImageView imageview  ImageView view findViewById R id imageview1                return view

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Layout inflater comes into picture here  Layout inflater is a class that make us able to use the XML views in java code  So you can inflate the root xml view in variable v with the following code  And then using v  you can find the child views of the root view v   public class TestClass extends Fragment       public View onCreateView LayoutInflater inflater  ViewGroup container  Bundle savedInstanceState        View v   inflater inflate R layout testclassfragment  container  false       ImageView imageView    ImageView v findViewById R id my image       return v

[android] findViewById in Fragment

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