implementing OnClickListener for a fragment on android

Question

I have a sliding menu project and inside home layout another layout is called as a fragment :

this is the HomeFragment.java :

package info.androidhive.slidingmenu;

import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class HomeFragment extends Fragment {

    public HomeFragment(){}

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

        View rootView = inflater.inflate(R.layout.fragment_home, container, false);

        return rootView;
    }
}

I need to import this click listener inside my java class in order to submit a form .

//CheckFal:
            btnCheckFalAction = (Button) findViewById(R.id.btnCheckFal);
            btnCheckFalAction.setOnClickListener(new OnClickListener() {           

                  @Override
                  public void onClick(View v) 
                  {
                      Toast.makeText(this, "Hello World", Toast.LENGTH_LONG).show();
                  }    
                }

But when I add the above code snippet it throws me an error on undefined methods such as findViewById , OnClickListener , onClick

The button is inside this layout fragment_home.xml

  <Button
      android:id="@+id/btnCheckFal"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_below="@+id/relativeLayout1"
      android:layout_centerHorizontal="true"
      android:layout_marginTop="19dp"
      android:text="@string/CheckFal" />

Answer 1

While working with Fragment, you have to inflate view.

So when you want to use any widget you have to use view object with findViewById().

Simply Do like this...

public class HomeFragment extends Fragment {

    public HomeFragment(){}

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

        View rootView = inflater.inflate(R.layout.fragment_home, container, false);

            btnCheckFalAction = (Button) rootView.findViewById(R.id.btnCheckFal); // you have to use rootview object..
            btnCheckFalAction.setOnClickListener(new OnClickListener() {           

                  @Override
                  public void onClick(View v) 
                  {
                      Toast.makeText(getActivity(), "Hello World", Toast.LENGTH_LONG).show();
                  }    
                });

        return rootView;
    }
}

OR try other way..

public class HomeFragment extends Fragment implements OnClickListener{

    public HomeFragment(){}

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

        View rootView = inflater.inflate(R.layout.fragment_home, container, false);

            btnCheckFalAction = (Button) rootView.findViewById(R.id.btnCheckFal); // you have to use rootview object..
            btnCheckFalAction.setOnClickListener(this);

        return rootView;
    }
    @Override
    public void onClick(View v) {
     // TODO Auto-generated method stub
     switch(v.getId()){

     case R.id.btnCheckFal :
         //your code...
     break;

    default:
        break;

     }

    }
}