How to determine when Fragment becomes visible in Viewpager

In this android programming source code example, we are going to determine when fragment becomes visible in viewpager.

Below is a step by step source code to determine when fragment becomes visible in viewpager.

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">

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</RelativeLayout>

MainActivity.java

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;


public class FragmentActivity10 extends AppCompatActivity {
    private ViewPager viewPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_fragment10);
        viewPager = (ViewPager)findViewById(R.id.viewpager);
        viewPager.setAdapter(new MyAdapter(getSupportFragmentManager()));
    }
    public class MyAdapter extends FragmentPagerAdapter {
        private MyAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int position){
            switch (position){
                case 0 : return new Fragment10();
            }
            return null;
        }

        @Override
        public int getCount() {
            return 1;
        }
    }

}

fragment_fragment10.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="Current visible viewpager fragment"
        android:gravity="center"
        android:textSize="20sp"/>

</RelativeLayout>

Fragment10.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;


public class Fragment10 extends Fragment{

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_fragment10, container, false);

        return view;
    }

    @Override
    public void setUserVisibleHint(boolean visible){
        super.setUserVisibleHint(visible);
        if(visible && isResumed()){
            onResume();
        }
    }

    @Override
    public void onResume(){
        super.onResume();
        if(!getUserVisibleHint()){
            return;
        }
        Toast.makeText(getActivity(),"Viewpager fragment is visible",Toast.LENGTH_LONG).show();
    }
}

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