We Keep Coding

loading GestureLibrary inside Fragment Activity not working

how to load Gesturelibrary inside Fragment Activity ...Please help me
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view =inflater.inflate(R.layout.fragment_a, container, false);
//error is here..."this" is not working
mLibrary = GestureLibraries.fromRawResource(this, R.raw.gestures);
gestureOverlayView = (GestureOverlayView)view.findViewById(R.id.gestureOverlayView);
return view;
}

It may be asking for context and it's throwing error because fragment doesn't have context.
Try to use like this:
mLibrary = GestureLibraries.fromRawResource(getActivity(), R.raw.gestures);

Adding calculator to navigation drawer

I've got a problem. For school project I have to create app in Android Studio with few activities so i decided to add Navigation Drawer, but when i try to create simple calculator to app i can't even reference button or textview. This is code for activity where I want to create calculator. Also I have to add Map Activity and SQLite Database.
public class Calculator_main extends Fragment {
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootview = inflater.inflate(R.layout.calculator, container, false);
return rootview;
}
}

Use rootView to find your item when referencing in a Fragment:
public class Calculator_main extends Fragment {
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootview = inflater.inflate(R.layout.calculator, container, false);
//Notice the TextView being referenced with rootView in front of the findViewById statement
TextView namefield = (TextView) rootView.findViewById(R.id.namefield);
return rootview;
}
}
You need to do this when using Fragment, as this is the only way your app can reference an item in your Fragment's XML view
This is however not necessary in an Activity and should not be confused with the method of referencing in a Fragment

Are Android Fragments View or ViewGroup

As the question reads, Fragments in android are View or ViewGroup. Can anyone explain
Here is the onCreateView method of Fragment from docs
public static class ExampleFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.example_fragment, container, false);
}
}
The container parameter passed to onCreateView() is the parent
ViewGroup (from the activity's layout) in which your fragment layout
will be inserted
And
To draw a UI for your fragment, you must return a View from this
method that is the root of your fragment's layout.

You cannot define fragments as views or viewgroups.Fragments are more than that.The easiest way to visualize fragment is to think of them as chunks of an activity having own xml appearance,own behaviour with own life cycle callbacks.They always run on top of an activity allowing you to perform operations such as add,replace etc on them at run time.This way you can switch between your layouts effectively and efficiently.
To understand onCreateView method,consider the following explanation:
public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState){
View view =inflater.inflate(R.layout.example_fragment, container, false);
return view;
}
this returns a single View object, always a ViewGroup, with the set of View object that defines the Fragment's UI. The Activity calls this event handler when it is time for the Fragment to provide its UI for display.

Neither. Fragment is a base class.
From https://developer.android.com/guide/components/fragments.html
A Fragment represents a behavior or a portion of user interface in
an Activity
Fragment contains a field:
// The View generated for this fragment.
View mView;
that is generated in onCreateView which has the implementation:
#Nullable
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container,
Bundle savedInstanceState) {
return null;
}
So if you want a Fragment with a View then #Override that method. And then the Fragment can be shown to the user if you use the appropriate fragment transaction from an Activity or nested Fragment.

fragment is a wrapper over a custom view thats tied to host activity lifecycle.

Fragments are a kind of Activity that don't take full screen,it can just split the screen into many fragments,so it is well used for phone and tablet .

i think is no,activity(fragment) control what the view shows,viewGroup extends view and implements ViewManger.Only Activity loads related Views can the phone show the layout.Activity is a Group,view can work normally in this container

FragmentStatePagerAdapter NullException

I have two fragments that contains ViewPager. The first fragment that contain viewPager works very well. As I come to second fragment that contain ViewPager, I start to get FragmentStatePagerAdapter NullException. I knew what is the problem, I need to implement onDetach function to get rid this problem. I search around the internet, there is a lots of solutions. And I'm currently using API 19. So maybe this solution very suitable for me. But I don't know how to use the solution.
getSupportFragmentManager().beginTransaction().detach(mFragment1).replace(R.id.main, mFragment2).attach(mFragment2).addToBackStack(null).commit();
What is exactly mFragment1 and mFragment2 and R.id.main ?
Fragment 1
public class fragment1 extends fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
View v = inflater.inflate(R.layout.fragment_restaurantprocess, container, false);
adapter = new RestaurantProcessPageAdapter(getActivity().getSupportFragmentManager());
...
}
}
Fragment 2
public class fragment2 extends fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
View v = inflater.inflate(R.layout.fragment_feedpage, container, false);
adapter = new RestaurantFeedPageFragment(getActivity().getSupportFragmentManager());
...
}
}
I'm using slide animation to fragment
public void changeFragment_toRight(Fragment frag) /* Slide to right screen */ {
if (getSupportFragmentManager().findFragmentByTag("frag")!=null)
getSupportFragmentManager().beginTransaction().setCustomAnimations(R.anim.right_slide_in, R.anim.right_slide_out).replace(R.id.container, frag, "frag").commit();
else
getSupportFragmentManager().beginTransaction().add(R.id.container, frag, "frag").commit();
}
changeFragment_toRight(new fragment1());
changeFragment_toRight(new fragment2());
Source: Click here to view the source

It looks like the problem is that you are manually using a FragmentTransaction to change fragments. A ViewPager will do this automatically when you supply it with an adapter, so when you change fragments, you are trying to remove a fragment that has already been removed.

Android, Java: Bundles & Views for Fragments

I have a fragment, that i want to put a textview which will have a 3 strings stored in it from the 'Main Activity'
The strings that I need to pass will come from the Main Activity and will be passed into FragmentClass
The issue is that its not recognising findViewById, i understand this is something to do with the views? Could someone advise me on how i could get this editText working and then how i can pass a bundle of strings from the MainActivity to the FragmentClass.
#SuppressLint("NewApi")
public class FragmentClass extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
//Inflate the layout for this fragment
return inflater.inflate(
R.layout.new_fragment, container, false);
// View rootView = inflater.inflate(R.layout.get_data, container, false);
TextView FragmentTextView = (TextView)findViewById(R.id.FragmentTextView);
}
}

Change to
#Override
public View onCreateView(LayoutInflater inflater,ViewGroup container, Bundle savedInstanceState) {
View view =inflater.inflate(R.layout.new_fragment, container, false);
TextView FragmentTextView = (TextView)view.findViewById(R.id.FragmentTextView);
return view;
}
Also you have #SuppressLint("NewApi") you have suppressed lint warning. Probably indicates that some features are available in new api's only. Do check your min sdk version in manifest