Simple summary of Android animation

Simple summary of Android animation

1. Android animation includes attribute animation and traditional animation (frame animation and tween animation)
2. There are two ways to implement Android animation: XML settings and Java (Kotlin) code implementation
3. Common animation implementation examples

<1> Zoom

<scale
    android:duration="2000"
    android:fillAfter="false"
    android:fromXScale="0.0"
    android:fromYScale="0.0"
    android:interpolator="@android:anim/accelerate_decelerate_interpolator"
    android:pivotX="50%"
    android:pivotY="50%"
    android:toXScale="1.0"
    android:toYScale="1.0"
    />

(1) Transparency

<alpha
    android:duration="5000"
    android:fromAlpha="0"
    android:toAlpha="1"
    />

<1> Rotation

<rotate
    android:duration="500"
    android:fromDegrees="0"
    android:interpolator="@android:anim/accelerate_decelerate_interpolator"
    android:pivotX="50%"
    android:pivotY="50%"
    android:toDegrees="+360"
    />

<1> Displacement

<translate
    android:duration="10000"
    android:fromXDelta="500"
    android:fromYDelta="0"
    android:toXDelta="0"
    android:toYDelta="0"
    />

Kotlin code: apply the above XML file to the image

val loadAnimation : Animation

when(view?.id) {
    /** 缩放 */
    R.id.btnScales -> {
        loadAnimation = AnimationUtils.loadAnimation(mContext, R.anim.scales)
        imgView.startAnimation(loadAnimation)
    }
    /** 透明度 */
    R.id.btnAlpha -> {
        loadAnimation = AnimationUtils.loadAnimation(mContext, R.anim.alpha)
        imgView.startAnimation(loadAnimation)
    }
    /** 旋转 */
    R.id.btnRotate -> {
        loadAnimation = AnimationUtils.loadAnimation(mContext, R.anim.rotate)
        imgView.startAnimation(loadAnimation)
    }
    /** 位移 */
    R.id.btnTranslate -> {
        loadAnimation = AnimationUtils.loadAnimation(mContext, R.anim.translate)
        imgView.startAnimation(loadAnimation)
    }
    /** 切换 */
    R.id.btnChange -> {
        val intent = Intent(mContext, SecondActivity::class.java)
        mContext.startActivity(intent)
        overridePendingTransition(R.anim.alpha, R.anim.rotate)
    }
    /** 闪烁 */
    R.id.btnFlash -> {
        val alphaAnimation = AlphaAnimation(0f, 0.5f)
        alphaAnimation.duration = 100
        alphaAnimation.repeatCount = 50
        alphaAnimation.repeatMode = Animation.REVERSE
        imgView.startAnimation(alphaAnimation)
    }
}

frame animation

<animation-list xmlns:android="http://schemas.android.com/apk/res/android">

    <item
        android:drawable="@drawable/ic_1"
        android:duration="100" />
    <item
        android:drawable="@drawable/ic_2"
        android:duration="100" />
    <item
        android:drawable="@drawable/ic_3"
        android:duration="100" />
    <item
        android:drawable="@drawable/ic_4"
        android:duration="100" />
    <item
        android:drawable="@drawable/ic_5"
        android:duration="100" />
    <item
        android:drawable="@drawable/ic_6"
        android:duration="100" />
    <item
        android:drawable="@drawable/ic_7"
        android:duration="100" />
    <item
        android:drawable="@drawable/ic_8"
        android:duration="100" />

</animation-list>

Kotlin code

imgAnimation.setImageResource(R.drawable.loading)
val animationDrawable : AnimationDrawable = imgAnimation.drawable as AnimationDrawable
animationDrawable.start()

The above is the code (Kotlin, not Java) implementation of Android animation implementation. If you have any questions, you can tell me by E-mail, and I will try my best to correct it.
In addition , I have put the code on Github: https:// github.com/fengwenyi/android-animation