PageIndicatorView is light library to indicate ViewPager's selected page with different animations and ability to customise it as you need.

To add pageindicatorview to your project, first make sure in root build.gradle you have specified the following repository:

    repositories {
        jcenter()
    }

Note: by creating new project in Android Studio it will have jcenter repository specified by default, so you will not need to add it manually.

Once you make sure you have jcenter repository in your project, all you need to do is to add the following line in dependencies section of your project build.gradle.

See latest library version

implementation 'com.romandanylyk:pageindicatorview:X.X.X'

If your project already use appcompat-v7 support library, you can omit PageIndicatorView dependencies by adding a single .aar file to your project, that will decrease total amount of methods used in your project.

implementation 'com.romandanylyk:pageindicatorview:X.X.X@aar'

Keep in mind, that PageIndicatorView has min API level 14 and these dependencies:

implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.android.support:recyclerview-v7:27.1.1'
implementation 'com.android.support:support-core-ui:27.1.1'

Usage of PageIndicatorView is quite simple. All you need to do is to declare a view in your layout.xml and call setSelection method to select specific indicator - that's it!

PageIndicatorView pageIndicatorView = findViewById(R.id.pageIndicatorView);
        pageIndicatorView.setCount(5); // specify total count of indicators
        pageIndicatorView.setSelection(2);

But if you're as lazy as I'm - then there is another option to handle PageIndicatorView

     <com.rd.PageIndicatorView
        android:id="@+id/pageIndicatorView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        app:piv_animationType="scale"
        app:piv_dynamicCount="true"
        app:piv_interactiveAnimation="true"
        app:piv_selectedColor="@color/gray_50"
        app:piv_unselectedColor="@color/gray_300"
        app:piv_viewPager="@id/viewPager"
        attrs:piv_padding="12dp"
        attrs:piv_radius="8dp" />

All the piv_ attributes here are specific for PageIndicatorView so you can customise it as you want with attributes - pretty handy.

But what is more important here is app:piv_viewPager="@id/viewPager". What it actually do is catch up your ViewPager and automatically handles all the event's to selected the right page - so you don't need to call setSelection method on your own.

Another handy options here that works with your ViewPager as a whole is app:piv_dynamicCount="true" and app:piv_interactiveAnimation="true"

Dynamic count will automatically updates PageIndicatorView total count as you updates pages count in your ViewPager - so that's pretty useful.

While interactive animation will progress the animation process within your swipe position, which makes animation more natural and responsive to end user.

Note: Because setViewPagerId uses an instance of ViewPager, using it in recycler could lead to id conflicts, so PageIndicatorView will not know properly what is the right ViewPager to work with. Instead you should handle selected indicators on your own programatically.

  pager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {/*empty*/}

            @Override
            public void onPageSelected(int position) {
                pageIndicatorView.setSelection(position);
            }

            @Override
            public void onPageScrollStateChanged(int state) {/*empty*/}
        });

Here you can see all the animations PageIndicatorView support.

Name	Support version	Preview
AnimationType.NONE	0.0.1
AnimationType.COLOR	0.0.1
AnimationType.SCALE	0.0.1
AnimationType.SLIDE	0.0.1
AnimationType.WORM	0.0.1
AnimationType.FILL	0.0.6
AnimationType.THIN_WORM	0.0.7
AnimationType.DROP	0.1.0
AnimationType.SWAP	0.1.1

See release notes on github releases or Bintray release notes.

Copyright 2017 Roman Danylyk

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.