ViewPager with dynamic height support and smooth animations

WrappingViewPager

ViewPager replacement with dynamic height support and smooth animations for the few edge cases where a standard ViewPager doesn't fulfill your needs.

This project is inactive. Pull requests are welcome!

Install

The library is available on jitpack.io.

Gradle dependency:

allprojects {
    repositories {
        maven { url 'https://jitpack.io' }
    }
}

dependencies {
	compile 'com.github.iffa:wrapping-viewpager:1.10'
}

Quick start

Integrating the library takes less than five minutes: below are the basic steps to get you started.

Use xyz.santeri.wvp.WrappingViewPager instead of android.support.v4.view.ViewPager and set the height to wrap_content in your layout file:

<xyz.santeri.wvp.WrappingViewPager
	android:id="@+id/viewpager"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

Replace your PagerAdapter with any one of the following adapters with wrapping-functionality built-in:

WrappingFragmentPagerAdapter
WrappingFragmentStatePagerAdapter

Implement the wrapping in your own adapter implementation by overriding PagerAdapter#setPrimaryItem(ViewGroup, int, Object) like so:

private int mCurrentPosition = -1; // Keep track of the current position

@Override
public void setPrimaryItem(ViewGroup container, int position, Object object) {
    super.setPrimaryItem(container, position, object);

    if (!(container instanceof WrappingViewPager)) {
        return; // Do nothing if it's not a compatible ViewPager
    }

    if (position != mCurrentPosition) { // If the position has changed, tell WrappingViewPager
        Fragment fragment = (Fragment) object;
        WrappingViewPager pager = (WrappingViewPager) container;
        if (fragment != null && fragment.getView() != null) {
            mCurrentPosition = position;
            pager.onPageChanged(fragment.getView());
        }
    }
}

(optional) Set the animation duration and interpolator to your liking with WrappingViewPager#setAnimationDuration(long) (default 100ms) and WrappingViewPager#setAnimationInterpolator(Interpolator).
Enjoy!

For a working demo see the sample module.

License

Copyright (C) 2016 Santeri Elo

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.

private int mCurrentPosition = -1; // Keep track of the current position @Override public void setPrimaryItem(ViewGroup container, int position, Object object) { super.setPrimaryItem(container, position, object); if (!(container instanceof WrappingViewPager)) { return; // Do nothing if it's not a compatible ViewPager } if (position != mCurrentPosition) { // If the position has changed, tell WrappingViewPager ImageView imageView = (ImageView) object; WrappingViewPager pager = (WrappingViewPager) container; if (imageView != null) { mCurrentPosition = position; pager.onPageChanged(imageView); } } }

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="wrap_content"> <xyz.santeri.wvp.WrappingViewPager android:id="@+id/customPager" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_gravity="top"> </xyz.santeri.wvp.WrappingViewPager> </FrameLayout>

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="200dp"> <xyz.santeri.wvp.WrappingViewPager android:id="@+id/customPager" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_gravity="top"> </xyz.santeri.wvp.WrappingViewPager> </FrameLayout>