How to handle button clicks using the xml onclick within fragments in android

In this android programming source code example, we are going to explore how to handle button clicks using the xml onclick within fragments in android.

Below is a step by step source code to handle button clicks using the xml onclick within fragments in android

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ededed">

    <FrameLayout
        android:id="@+id/frame"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</RelativeLayout>

MainActivity.java

import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;

import com.bluapp.androidview.R;

public class FragmentActivity20 extends AppCompatActivity {
    private Fragment20 fragment20;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_fragment20);
        fragment20 = new Fragment20();
        FragmentManager mFragmentManager = getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction();
        fragmentTransaction.replace(R.id.frame,fragment20).commit();

    }
    public void btnToast(View view){
        fragment20.btnToast(view);
    }
}

fragment_fragment20.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ededed">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="Xml OnClick For Fragment"
        android:gravity="center"
        android:textSize="20sp"/>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorAccent"
        android:layout_alignParentBottom="true"
        android:text="Show Toast"
        android:onClick="btnToast"/>

</RelativeLayout>

Fragment20.java

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

import com.bluapp.androidview.R;

public class Fragment20 extends Fragment{

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_fragment20, container, false);

        return view;
    }

    public void btnToast(View view){
        Toast.makeText(getActivity(),"Toast Hello",Toast.LENGTH_LONG).show();
    }

}

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