DEPRECATED - Use the project for more of guide and ideas how to apply parallax techniques. I will not support this library anymore.

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.

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.

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

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.

Currently I only support Gradle

Temporary steps from @therealkris.

• First, I cloned the library into myproject/libs/paralloid.
• In my settings.gradle, I added include ':libs:paralloid:paralloid', ':libs:paralloid:paralloidviews'.
• In my build.gradle, I added compile project(':libs:paralloid:paralloid'), project(':libs:paralloid:paralloidviews').
• In libs/paralloid/paralloid, I removed the uploadArchives {} block.
• In libs/paralloid/paralloidviews, I removed the uploadArchives {} block AND changed the dependency to read: compile project(':libs:paralloid:paralloid') instead of compile project(':paralloid')

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

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>

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.

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).
• Implement the Parallaxor interface.
• Job done! See below for an example

Example implementation:

public class MyScrollView extends ScrollView implements Parallaxor {
  //...
  ParallaxViewController mParallaxViewController;

  // Call init() in constructors
  private void init() {
    mParallaxViewController = ParallaxViewController.wrap(this);
  }

  @Override
  protected void onScrollChanged(int l, int t, int oldl, int oldt) {
    super.onScrollChanged(l, t, oldl, oldt);
    mParallaxViewController.onScrollChanged(this, l, t, oldl, oldt);
  }

  // region Implementation of Parallaxor

  @Override
  public void parallaxViewBy(View view, float multiplier) {
    mParallaxViewController.parallaxViewBy(view, multiplier);
  }

  @Override
  public void parallaxViewBy(View view, Transformer transformer, float multiplier) {
    mParallaxViewController.parallaxViewBy(view, transformer, multiplier);
  }

  @Override
  public void parallaxViewBackgroundBy(View view, Drawable drawable, float multiplier) {
    mParallaxViewController.parallaxViewBackgroundBy(view, drawable, multiplier);
  }

  // endregion
}