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An Android view for displaying repeated continuous side scrolling images. This can be used to create a parallax animation effect.
Step 1. Add the JitPack repository to your project build.gradle file
allprojects {
repositories {
// ~~~
maven { url 'https://jitpack.io' }
}
}Step 2. Add the dependency in the form
dependencies {
implementation 'com.github.Q42:AndroidScrollingImageView:1.3.4'
}Please see the sample app for some examples
In your Android layout file add:
<com.q42.android.scrollingimageview.ScrollingImageView
android:id="@+id/scrolling_background"
android:layout_width="match_parent"
android:layout_height="wrap_content"
scrolling_image_view:speed="60dp"
scrolling_image_view:contiguous="false"
scrolling_image_view:source="@drawable/scrolling_background" />There are three attributes for the ScrollingImageView:
-
speed is the number of dp's to move the drawable per second (may be a negative number)
-
source is the drawable to paint. May refer to an array of drawables
-
contiguous When source is an array of drawables, contiguous determines their ordering.
false (default) for random ordering, true for the same order as in the array
Don't forget to add the namespace to your root XML element
xmlns:scrolling_image_view="http://schemas.android.com/apk/res-auto"In your Java code, you can start and stop the animation like this:
ScrollingImageView scrollingBackground = (ScrollingImageView) loader.findViewById(R.id.scrolling_background);
scrollingBackground.stop();
scrollingBackground.start();In order to achieve a parallax effect, you can stack multiple ScrollingImageView's in a FrameLayout with different speeds. For example:
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<com.q42.android.scrollingimageview.ScrollingImageView
android:id="@+id/scrolling_background"
android:layout_width="match_parent"
android:layout_height="wrap_content"
scrolling_image_view:speed="60dp"
scrolling_image_view:source="@drawable/scrolling_background" />
<com.q42.android.scrollingimageview.ScrollingImageView
android:id="@+id/scrolling_foreground"
android:layout_width="match_parent"
android:layout_height="wrap_content"
scrolling_image_view:speed="150dp"
scrolling_image_view:source="@drawable/scrolling_foreground" />
</FrameLayout>