A library for dynamic view-to-view transitions

Last update: Dec 23, 2022

Overview

Transitioner provides easy, dynamic and adjustable animations between two views with nested children.

App design feature here.

Usage

First you need to create a Transitioner object containing your original and ending views:

val transition = Transitioner(original_view, ending_view)

The view pairs must have matching "tag" attributes so that they can be bound together:

<ConstraintLayout
        android:id="@+id/original_view"
        android:tag="constrView"
        ...>

        <TextView
            android:id="@+id/text"
            android:tag="firstView"
            .../>
</ConstraintLayout>

<ConstraintLayout
        android:id="@+id/ending_view"
        android:tag="constrView"
        android:visibility="invisible"
        ...>

        <EditText
            android:id="@+id/text3"
            android:tag="firstView"
            .../>
 </ConstraintLayout>

I recommend you hide the second view layout, since it's only used as a placeholder for the end destination. The views can be of any type, you can mix and match them, the two layouts can have a different number of views and nested layouts are 100% supported. The only things to keep in mind are:

all views which you would want to match together must have the same tag attribute in both layouts
all unmatched views will remain at their original place inside the original layout
the second layout is just a placeholder. It doesn't hold any logic, it only shows where the original layout should move to.

Basic Usage

 transition.setProgress(0.5f)
 //or
 transition.setProgress(50)

Additional methods and tweaks

transition.duration = 500

transition.interpolator = AccelerateDecelerateInterpolator()

transition.animateTo(percent = 0f)

transition.onProgressChanged {
//triggered on every progress change of the transition
    seekBar.progress = (it * 100).toInt()
    }
    
val progress: Float = transition.currentProgress

Here is a preview of a simple application made using this library

This effect can be reproduced by placing the "Transitioner.setProgress(Float)" function inside a onTouch or a onProgressChanged method.

Download

Manually

The recommended way to download is to copy the single library class file and use it in your application.

Gradle

dependencies {
  compile 'bg.devlabs.transitioner:transitioner:<latest_version>'
}

Getting help

Dev Labs @devlabsbg

Radoslav Yankov @rado__yankov

Under MIT License.

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Comments

AnimateTo Bug?

Hello, I'm still trying to do some animations with transitioner: unfortunately, I'm experiencing a lot of issues.

For example, in code I linked below I can expand my cardview with a "scroll down gesture" but I can't reduce it with a swipe up (I debugged the code and the if clauses are correctly called):

https://gist.github.com/davidmarinangeli/7eec8455654850b3d3540ff9a9384bd6

You can find the XML here: https://gist.github.com/davidmarinangeli/a4d0724d0f0283096e81e7ecf357c788

opened by davidmarinangeli 8
How can I make a swipe transition?

Hello!

I really like your library and I'm trying to develop a transition like the weather app on your Readme: how could I make an up/down swipe?

I've tried with this but the result is VERY BAD. Do you know where I can find some examples? Thanks. var screenSize = size.y screen.setOnTouchListener { v, event -> when (event.action) { MotionEvent.ACTION_DOWN -> { oldY = event.y true } MotionEvent.ACTION_MOVE -> { transition.setProgress((event.y - oldY)/screenSize) true } else -> { true } } }

opened by davidmarinangeli 5
java.lang.NoClassDefFoundError: Failed resolution of: Lkotlin/jvm/internal/Intrinsics;

Caused by: java.lang.ClassNotFoundException: Didn't find class "kotlin.jvm.internal.Intrinsics" on path: DexPathList[[zip file "/data/app/**/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]

opened by krunalindrodiya 3