Android动画，activity转场动画

1.activity转场动画

<item name="android:windowAnimationStyle">@style/MywindowAnim</item>
------------------------------------------------------------------------------   
<style name="MywindowAnim">
    <item name="android:activityOpenEnterAnimation">@anim/slide_in_left</item>
    <item name="android:activityOpenExitAnimation">@anim/slide_out_left</item>
    <item name="android:activityCloseEnterAnimation">@anim/slide_in_right</item>
    <item name="android:activityCloseExitAnimation">@anim/slide_out_right</item>
</style>

anim

slide_in_left

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate
        android:duration="300"
        android:fromXDelta="100%"
        android:toXDelta="0" />
</set>

slide_in_right

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate
        android:duration="300"
        android:fromXDelta="-100%"
        android:toXDelta="0" />
</set>

slide_out_left

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate
        android:duration="300"
        android:fromXDelta="0"
        android:toXDelta="-100%" />
</set>

slide_out_right

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate
        android:duration="300"
        android:fromXDelta="0"
        android:toXDelta="100%" />
</set>

2.帧动画(AnimationDrawable)

class FramAnimActivity : AppCompatActivity() {
    private val animationDrawable: AnimationDrawable by lazy { view.background as AnimationDrawable }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_fram_anim)

        animationDrawable.isOneShot = false

        btnStart.setOnClickListener { animationDrawable.start() }
        btnStop.setOnClickListener { animationDrawable.stop() }
    }
}
-----------------------------------------------------------------------------
<View
        android:id="@+id/view"
        android:layout_width="300dp"
        android:layout_height="300dp"
        android:layout_centerInParent="true"
        android:background="@drawable/loading" />
-----------------------------------------------------------------------------
        drawable/loading:
        
<?xml version="1.0" encoding="utf-8"?>
<animation-list android:oneshot="true"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:drawable="@drawable/frame_1"
        android:duration="100" />

    <item
        android:drawable="@drawable/frame_2"
        android:duration="100" />

    <item
        android:drawable="@drawable/frame_3"
        android:duration="100" />
</animation-list> 

3.视图动画（AnimationUtils.loadAnimation）

class ViewAnimActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_view_anim)
    }

    fun onClick(view: View) {
        when (view.id) {
            R.id.viewAlphaAnimation -> {
                val alphaAnimation = AnimationUtils.loadAnimation(this, R.anim.alpha)
                view.startAnimation(alphaAnimation)
            }
            R.id.viewScaleAnimation -> {
                val scaleAnimation = AnimationUtils.loadAnimation(this, R.anim.scale)
                view.startAnimation(scaleAnimation)
            }
            R.id.viewTranslateAnimation -> {
                val translateAnimation = AnimationUtils.loadAnimation(this, R.anim.translate)
                view.startAnimation(translateAnimation)
            }
            R.id.viewRotateAnimation -> {
                val rotateAnimation = AnimationUtils.loadAnimation(this, R.anim.rotate)
                view.startAnimation(rotateAnimation)
            }
            R.id.viewSetAnimation -> {
                val setAnimation = AnimationUtils.loadAnimation(this, R.anim.set)
                view.startAnimation(setAnimation)
            }
            R.id.viewAccelerate -> {
                val animationAccelerate = AnimationUtils.loadAnimation(this, R.anim.translate)
                animationAccelerate.interpolator = AccelerateInterpolator()//平移先慢后快的效果
                view.startAnimation(animationAccelerate)
            }
            R.id.viewLinear -> {
                val animationLinear = AnimationUtils.loadAnimation(this, R.anim.translate)
                animationLinear.interpolator = LinearInterpolator()
                view.startAnimation(animationLinear)
            }
        }
    }
}

anim

alpha:
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <alpha
        android:duration="1000"
        android:fromAlpha="1.0"
        android:toAlpha="0.1" />
</set>

rotate:
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:fillAfter="true">
    <rotate
        android:duration="300"
        android:pivotX="50%"
        android:pivotY="50%"
        android:repeatCount="6"
        android:fromDegrees="0"
        android:toDegrees="360" />
</set>

scale:
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <scale
        android:duration="1000"
        android:fromXScale="1.0"
        android:fromYScale="1.0"
        android:pivotX="50%"
        android:pivotY="50%"
        android:toXScale="2.0"
        android:toYScale="1.0" />
</set>

set:
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <rotate
        android:duration="1000"
        android:fromDegrees="0"
        android:pivotX="50%"
        android:pivotY="50%"
        android:toDegrees="720" />

    <translate
        android:duration="1000"
        android:fromXDelta="0"
        android:fromYDelta="0"
        android:startOffset="0"
        android:toXDelta="500"
        android:toYDelta="0" />
</set>

4.属性动画

class PropertyActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_property)
    }

    fun onClick(view: View) {
        when (view.id) {
            R.id.viewAlphaAnimation -> {
                val alphaAnimator = AnimatorInflater.loadAnimator(this, R.animator.alpha)
                alphaAnimator.setTarget(view)
                alphaAnimator.start()
            }
            R.id.viewScaleAnimation -> {
                ObjectAnimator.ofFloat(view, "scaleX", 1.0f, 3.0f).start()
            }
            R.id.viewTranslateAnimation -> {
                view.animate().translationX(500f).setDuration(1000).start()
            }
            R.id.viewRotateAnimation -> {
                view.animate().rotation(720f).start()
            }
            R.id.viewSetAnimation -> {
                view.animate().rotation(720f).setDuration(1000).start()
                view.animate().translationX(500f).setDuration(1000).setStartDelay(1000).start()
            }
        }
    }
}