Paralloid

Paralloid - (Pah-rah-loid) The Android Parallax library

Compatible back to API 7

An example application, Paralloid Library Example, can be downloaded from the Play Store.

ParallaxScrollView is dead..

I originally wrote ParallaxScrollView a while back as proof of concept, people took surprisingly well to it; but from the get-go it was a fundamentally flawed.

Tightly-coupled and inflexible, made it difficult to maintain and confusing for people to use.

Features

Currently limited but will expand when requests.

• Parallax another view when the parent scrolls.
• Parallax multiple backgrounds.
• Transformers, Parallax in different ways and directions

Supports:

• ListView
• ScrollView
• HorizontalScrollView

Modular

Paralloid is designed to be modular and very loosely coupled (to an extent).

Two high level modules exist

• paralloid - which is the library which everything extends from.
• paralloidviews - which extends the library with a couple of pre-extended ScrollableViews.
• paralloidexamples - which is of course the examples App.

Generally use paralloidviews as it contains everything you need to get going.

Getting Started

Dependency

Currently I only support Gradle

Locally:

dependencies {
    compile project(':paralloidviews')
}

Or Repository (coming soon):

dependencies {
    compile 'uk.co.chrisjenx.paralloid:paralloid:0.1.+'
}

Layout

ScrollView

This is an example, please refer to the paralloidexample App for full code.

<FrameLayout ..>
<FrameLayout 
		android:id="@+id/top_content"
           	android:layout_width="match_parent"
           	android:layout_height="192dp"/>

<uk.co.chrisjenx.paralloid.views.ParallaxScrollView
        android:id="@+id/scroll_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fillViewport="true">

    <LinearLayout
    	android:id="@+id/scroll_content"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:paddingTop="192dp"/>
            
</uk.co.chrisjenx.paralloid.views.ParallaxScrollView>
</FrameLayout>

Fragment

Inside your onViewCreated() or onCreateView().

//...
FrameLayout topContent = (FrameLayout) rootView.findViewById(R.id.top_content);
ScrollView scrollView = (ScrollView) rootView.findViewById(R.id.scroll_view);
if (scrollView instanceof Parallaxor) {
        ((Parallaxor) scrollView).parallaxViewBy(topContent, 0.5f);
}
// TODO: add content to top/scroll content

Thats it!

Have a look at the Parallaxor interface for applicable Parallax methods.

Custom View's

I tried to keep this as simple as possible, you can nearly copy and paste this.

• Extend the Scrollable view (or the one you allready have).
• Impliment the Parallaxor interface.
• Job done! See below for an example

Example implementation:

public class MyScrollView extends ScrollView implements Parallaxor {
  //...
  ParallaxScrollController mParallaxScrollController;
  
  private void init() {
    mParallaxScrollController = ParallaxScrollController.wrap(this);
  }
  
  @Override
  public void parallaxViewBy(View view, float factor) {
    mParallaxScrollController.parallaxViewBy(view, factor);
  }
  
  @Override
  public void parallaxBackgroundBy(Drawable drawable, float factor) {
    mParallaxScrollController.parallaxBackgroundBy(drawable, factor);
  }
  
  @Override
  protected void onScrollChanged(int l, int t, int oldl, int oldt) {
    super.onScrollChanged(l, t, oldl, oldt);
    mParallaxScrollController.onScrollChanged(this, l, t, oldl, oldt);
  }
}