Image filtration with motion layout
In this blog, we are going to learn some cool features of motion layout. Image filtration is one of them.
MotionLayout:-
Motion Layout is a new class available in the ConstraintLayout 2.0 library. By using this class we can manage motion and widget animation in their application.
First of all, we have to implement dependency.
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implementation 'androidx.constraintlayout:constraintlayout:2.0.0-alpha2' |
Implement this in your build.greadle (app) file.
Lets’s start some code:-
Now open your layout file in my case it is activity_main.xml.
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<?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.motion.widget.MotionLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/motion_layout" android:layout_width="match_parent" android:layout_height="match_parent" app:layoutDescription="@xml/demo_motion" tools:context=".MainActivity"> <androidx.constraintlayout.utils.widget.ImageFilterView android:id="@+id/image" android:layout_width="100dp" android:layout_height="100dp" app:srcCompat="@drawable/sun_set" /> </androidx.constraintlayout.motion.widget.MotionLayout> |
In this layout file, We have MotionLayout as a view group and ImageFilterView as a child view. To perform Image filtration we need to use ImageFilterView.
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app:layoutDescription="@xml/demo_motion" |
In this layout file, we use layoutDescription attribute and parse a layout file motion demo_motion in it. Because layoutDesciption holds a reference of your motion_scene layout file.
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<?xml version="1.0" encoding="utf-8"?> <MotionScene xmlns:android="http://schemas.android.com/apk/res/android" xmlns:motion="http://schemas.android.com/apk/res-auto"> <Transition motion:constraintSetEnd="@id/end" motion:constraintSetStart="@id/start" motion:duration="1000" motion:interpolator="linear"> <OnSwipe motion:dragDirection="dragRight" motion:touchAnchorId="@+id/image" motion:touchAnchorSide="right" /> </Transition> <ConstraintSet android:id="@+id/start"> <Constraint android:id="@id/image" android:layout_width="100dp" android:layout_height="100dp" android:layout_marginStart="8dp" motion:layout_constraintBottom_toBottomOf="parent" motion:layout_constraintStart_toStartOf="parent" motion:layout_constraintTop_toTopOf="parent"> <CustomAttribute motion:attributeName="saturation" motion:customFloatValue="1" /> </Constraint> </ConstraintSet> <ConstraintSet android:id="@+id/end"> <Constraint android:id="@id/image" android:layout_width="100dp" android:layout_height="100dp" android:layout_marginEnd="8dp" motion:layout_constraintBottom_toBottomOf="parent" motion:layout_constraintEnd_toEndOf="parent" motion:layout_constraintTop_toTopOf="parent"> <CustomAttribute motion:attributeName="saturation" motion:customFloatValue="0" /> </Constraint> </ConstraintSet> </MotionScene> |
This is the file that defines the type of motion/animation we want and what the starting/ending constraints are.
Here we defined a Transition (the animation) with duration & a start/endpoint to the layouts. And also a swipe Trigger on the image (with up direction) — which adds interactivity.
Specifying the saturation can be done simply by using a CustomAttribute:
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<CustomAttribute motion:attributeName="saturation" motion:customFloatValue="1" /> |
Therefore we define saturation values 1 and 0 to get the filter effect.
As a result of saturation manipulation, we get a filter effect on our image.
We define two ConstraintSet children in our xml. Start and end positions of that image.
Finally, we have achieved Image filtration with motion layout.
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