How to Handle Button Clicks Using the Xml Onclick Within Fragments

How to handle button clicks using the XML onClick within Fragments

You could just do this:

Activity:

Fragment someFragment;    

//...onCreate etc instantiating your fragments

public void myClickMethod(View v) {
    someFragment.myClickMethod(v);
}

Fragment:

public void myClickMethod(View v) {
    switch(v.getId()) {
        // Just like you were doing
    }
}    

---

In response to @Ameen who wanted less coupling so Fragments are reuseable

Interface:

public interface XmlClickable {
    void myClickMethod(View v);
}

Activity:

XmlClickable someFragment;    

//...onCreate, etc. instantiating your fragments casting to your interface.

public void myClickMethod(View v) {
    someFragment.myClickMethod(v);
}

Fragment:

public class SomeFragment implements XmlClickable {

//...onCreateView, etc.

@Override
public void myClickMethod(View v) {
    switch(v.getId()){
        // Just like you were doing
    }
}    

How to Handle onClick in Fragments

Better approach would be implementing OnClickListener to your fragment class and overriding onCreateView in your fragment where you assign the listener to your button.

By putting onClick attribute in your XML layout, your activity on load will look for the element in the activity, not in the fragment. This will throw exception.

I would suggest reading some fragment-activity hierarchy to understand when is it possible to access elements in your fragment.

public class StartFragment extends Fragment implements OnClickListener{

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    View v = inflater.inflate(R.layout.fragment_start, container, false);

    Button b = (Button) v.findViewById(R.id.save_keywords);
    b.setOnClickListener(this);
    return v;
}

@Override
public void onClick(View v) {
    switch (v.getId()) {
    case R.id.save_keywords:

        ...

        break;
    }
}
}

Reference from: here

Android Fragment onClick button Method

Your activity must have

public void insertIntoDb(View v) {
...
} 

not Fragment .

If you don't want the above in activity. initialize button in fragment and set listener to the same.

<Button
    android:id="@+id/btn_conferma" // + missing

Then

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

   View view = inflater.inflate(R.layout.fragment_rssitem_detail,
    container, false);
   Button button = (Button) view.findViewById(R.id.btn_conferma);
   button.setOnClickListener(new OnClickListener()
   {
             @Override
             public void onClick(View v)
             {
                // do something
             } 
   }); 
   return view;
}

Button OnClick in a fragment

Your TabLayout requires a new instance of PlaceholderFragment each time a new page is selected, so let's take a closer look at its onCreateView():

Depending on the value of getArguments().getInt(ARG_SECTION_NUMBER), a specific layout is inflated. If the value is 1, the layout will be the same as for SubPage02.

But this does not mean that an instance of SubPage02 will be created, they just happen to share the same layout file.

So the OnClickListener has to be set in the onCreateView() of PlaceholderFragment:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    if (getArguments().getInt(ARG_SECTION_NUMBER) == 2) {
        View rootView = inflater.inflate(R.layout.fragment_blank, container, false);
        return rootView;
    } else if (getArguments().getInt(ARG_SECTION_NUMBER) == 1) {
        View rootView = inflater.inflate(R.layout.fragment_sub_page02, container, false);

        Button mButton = (Button) rootView.findViewById(R.id.button);
        mButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // here you set what you want to do when user clicks your button,

            }
        });

        return rootView;
    } else {
        View rootView = inflater.inflate(R.layout.fragment_main, container, false);
        return rootView;
    }
}

Click Listener of button from the XML of a fragment that is MVVM based architecture not working

If you want to call viewmodel method from xml using data binding ,first you need to set viewmodel object for xml in your fragment.

profileViewModel =
            new ViewModelProvider(requireActivity()).get(ProfileViewModel.class);
    binding = FragmentProfileBinding.inflate(inflater, container, false);
    binding.setLifecycleOwner(this);
    binding.setProfileFragment(profileViewModel);

Fragment with buttons: onClick() vs. XML onClick

FWIW I never use the xml onClick attributes. Although they may save a couple of lines of typing, they make it more difficult to follow what's happening in your code.

If your class implements View.OnClickListener and you have correctly overriden the onClick method (which it looks like you have), then you can safely remove any onClicks in your layout files and instead assign methods to your widget clicks in the following way:

public class MainFragment extends Fragment implements View.OnClickListener {
    private Button viewOne, viewTwo, viewThree;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.your_layout, container, false);

        viewOne = (Button) rootView.findViewById(R.id.view_one);
        viewTwo = //etc...

        //"this" refers to the current object. As the object is of a class that implements OnClickListener, 
        //passing "this" satisfies the View.OnClickListener parameter required for the setOnClickListener() method.
        viewOne.setOnClickListener(this);
        viewTwo.setOnClickListener(this);
        viewThree.setOnClickListener(this);

        return rootView;
    }


   @Override
   public void onClick(View view) {
       //To identify the correct widget, use the getId() method on the view argument
       int id = view.getId();
       switch (id) {
           case R.id.view_one:
               //viewOne clicked
               break;
           case R.id.view_two:
               //And so on...
       }
   }
}

Android onClick inside Fragments not found

If used Fragment then try below code.
issue in your onRotateButtonClicked

public class SecondFragment extends Fragment implements OnClickListener{

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

        View v = inflater.inflate(R.layout.fragment_second, container, false);

        ImageButton button = (ImageButton) v.findViewById(R.id.button);
        button.setOnClickListener(this);
        return v;
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.button :
                // your button click 
                i1 = (ImageView) getView().findViewById(R.id.imageView4);
                Animation rotateAnimation = new RotateAnimation(
                0,
                360,
                Animation.RELATIVE_TO_SELF,
                0.5f,
                Animation.RELATIVE_TO_SELF,
                0.5f);
                rotateAnimation.setDuration(500);
                i1.startAnimation(rotateAnimation);
            break;
        }
    }
}

---

Related Topics