How to Set a Viewpager Inside a Fragment

How to set a ViewPager inside a Fragment

Starting in Android 4.2, there are nested fragments.http://developer.android.com/about/versions/android-4.2.html#NestedFragments The support library now also includes support for this for older Android versions.

So you can do something like this:

@Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    ViewPager mViewPager = (ViewPager) view.findViewById(R.id.viewPager);
    mViewPager.setAdapter(new MyAdapter(getChildFragmentManager()));
    }

Full implementation available here: https://github.com/marcoRS/nested-fragments/tree/master/src/com/burnside/digital/nestedfragments

How to put viewpager inside fragment in android?

To have a ViewPager be in a fragment, and to have fragments be the pages in that ViewPager, you need to use nested fragments. If your minSdkVersion is 17 or higher, the native implementation of fragments supports nested fragments. Otherwise, you will need to use the support-v13 (or support-v4) backport of fragments.

Then, you just need to give getChildFragmentManager() to your FragmentPagerAdapter or FragmentStatePagerAdapter:

/***
  Copyright (c) 2012 CommonsWare, LLC
  Licensed under the Apache License, Version 2.0 (the "License"); you may not
  use this file except in compliance with the License. You may obtain a copy
  of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required
  by applicable law or agreed to in writing, software distributed under the
  License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
  OF ANY KIND, either express or implied. See the License for the specific
  language governing permissions and limitations under the License.

  From _The Busy Coder's Guide to Android Development_
    http://commonsware.com/Android
 */

package com.commonsware.android.pagernested;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class PagerFragment extends Fragment {
  @Override
  public View onCreateView(LayoutInflater inflater,
                           ViewGroup container,
                           Bundle savedInstanceState) {
    View result=inflater.inflate(R.layout.pager, container, false);
    ViewPager pager=(ViewPager)result.findViewById(R.id.pager);

    pager.setAdapter(buildAdapter());

    return(result);
  }

  private PagerAdapter buildAdapter() {
    return(new SampleAdapter(getActivity(), getChildFragmentManager()));
  }
}

(from this sample project)

Add ViewPager in Fragment in Android

In FirstFragment , Use this code and try

public View view; // declare view as global variable

@Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
        if(view == null){
              view = inflater.inflate(R.layout.first_fragment, null);
              mViewPager = (ViewPager) view.findViewById(R.id.view_pager);
              ViewPagerAdapter adapter = new ViewPagerAdapter(mainActivity.getSupportFragmentManager());
              mViewPager.setAdapter(adapter);
        }
        return view;
    }

As Divyesh comment has good suggestion there is also need to add

mViewPager.setOffscreenPageLimit(3);

ViewPager inside Fragment

That's a common bug with design support library related to ViewCompat.

@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);

    setupViewPager(viewPager);
    // after you set the adapter you have to check if view is laid out, i did a custom method for it
    if (ViewCompat.isLaidOut(tabLayout)) {
        setViewPagerListener();
    } else {
        tabLayout.addOnLayoutChangeListener(new View.OnLayoutChangeListener() {
           @Override
           public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) {
                setViewPagerListener();
                tabLayout.removeOnLayoutChangeListener(this);
           }
       });
    }
}

private void setViewPagerListener() {
    tabLayout.setupWithViewPager(viewPager);
    // use class TabLayout.ViewPagerOnTabSelectedListener
    // note that it's a class not an interface as OnTabSelectedListener, so you can't implement it in your activity/fragment
    // methods are optional, so if you don't use them, you can not override them (e.g. onTabUnselected)
    tabLayout.setOnTabSelectedListener(new TabLayout.ViewPagerOnTabSelectedListener(viewPager) {
        @Override
        public void onTabReselected(TabLayout.Tab tab) {
            super.onTabReselected(tab);
        }

        @Override
        public void onTabSelected(TabLayout.Tab tab) {
            super.onTabSelected(tab);
        }
    });
}

Also, holding onto a list of Fragment instances in a ViewPagerAdapter (especially FragmentPagerAdapter) will most likely cause crashes after process death in production, so your adapter should look like this:

public class ViewPagerAdapter extends FragmentPagerAdapter {
    public ViewPagerAdapter(FragmentManager fragmentManager) {
        super(fragmentManager);
    }

    @Override
    public Fragment getItem(int position) {
        if(position == 0) return new TopTracks();
        if(position == 1) return new WorldCharts();
        if(position == 2) return new NewMusic();
        if(position == 3) return new AfricaHot();
        if(position == 4) return new Playlists();
        if(position == 5) return new Recommended();
        throw new IllegalStateException("Unexpected position " + position);
    }

    @Override
    public int getCount() {
        return 6;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        if(position == 0) return "Top Tracks";
        if(position == 1) return "World Charts";
        if(position == 2) return "New Music";
        if(position == 3) return "Africa Hot";
        if(position == 4) return "Playlists";
        if(position == 5) return "Recommended";
        throw new IllegalStateException("Unexpected position " + position);
    }
}

How can I put a ViewPager inside a Fragment?

Option #1: Use nested fragments. That will require you to have your minSdkVersion set to 17 or higher, or you will have to use the fragments backport from the Android Support Package. This sample app demonstrates using the backport.

In short, your fragment that hosts the ViewPager will pass getChildFragmentManager() to your FragmentPagerAdapter or FragmentStatePagerAdapter:

/***
  Copyright (c) 2012 CommonsWare, LLC
  Licensed under the Apache License, Version 2.0 (the "License"); you may not
  use this file except in compliance with the License. You may obtain a copy
  of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required
  by applicable law or agreed to in writing, software distributed under the
  License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
  OF ANY KIND, either express or implied. See the License for the specific
  language governing permissions and limitations under the License.

  From _The Busy Coder's Guide to Android Development_
    http://commonsware.com/Android
 */

package com.commonsware.android.pagernested;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class PagerFragment extends Fragment {
  @Override
  public View onCreateView(LayoutInflater inflater,
                           ViewGroup container,
                           Bundle savedInstanceState) {
    View result=inflater.inflate(R.layout.pager, container, false);
    ViewPager pager=(ViewPager)result.findViewById(R.id.pager);

    pager.setAdapter(buildAdapter());

    return(result);
  }

  private PagerAdapter buildAdapter() {
    return(new SampleAdapter(getActivity(), getChildFragmentManager()));
  }
}

Option #2: Write your own PagerAdapter that does not use fragments (or have anything inside of it managed by fragments). Then, you do not need nested fragments anymore, and you can just use your custom PagerAdapter with a ViewPager that is hosted by a fragment.

How to implement a viewpager inside of a fragment?

I use this one hope it help you too : https://github.com/thecodepath/android_guides/wiki/ViewPager-with-FragmentPagerAdapter

So you can use this one: https://github.com/astuetz/PagerSlidingTabStrip

Calling ViewPager inside a Fragment

Root cause

In view_pager_fragment.xml file, you declare a ViewPager2 with id sliderViewPager but in ViewPagerFragment class, you use a ViewPager variable and assign a view with id viewPagerFragment to it.

Solution

Step 1. Change fragment_view_pager.xml to:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white"
    android:orientation="vertical">

    <androidx.viewpager.widget.ViewPager
        android:id="@+id/sliderViewPager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="center"
        android:layout_weight="1">

    </androidx.viewpager.widget.ViewPager>

    <LinearLayout
        android:id="@+id/dotsLayout"
        android:layout_width="wrap_content"
        android:layout_height="66dp"
        android:layout_gravity="center"
        android:layout_weight="1"
        android:orientation="horizontal">
    </LinearLayout>
</LinearLayout>

Step 2. In ViewPagerFragment class, change your code from

viewpager = (ViewPager) view.findViewById(R.id.viewPagerFragment);

to

viewpager = (ViewPager) view.findViewById(R.id.sliderViewPager);

---

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