短视频源码安卓中的普通动画和属性动画的基本操作

透明度变化
1.普通动画

其中repeatCount为循环多少次,infinite为无限循环

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <alpha
        android:fromAlpha="0.1"
        android:repeatCount="infinite"
        android:duration="500"
        android:toAlpha="1" />
</set>

 Animation animation = AnimationUtils.loadAnimation(this, R.anim.alpha);
                animation.setDuration(1000);
                image.startAnimation(animation);

2.属性动画

 ObjectAnimator objectAnimator = ObjectAnimator.ofFloat(image, "alpha", 0f, 1.0f,0f);
                objectAnimator.setRepeatCount(ValueAnimator.INFINITE);
                objectAnimator.setDuration(1000);
                objectAnimator.start();
 

平移
1.普通动画

平移回来又回去,注意回去就已经变为负数,因为新的起点变为0

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
 
    <translate
        android:fromXDelta="0"
        android:duration="1000"
        android:toXDelta="500" />
 
    <translate
        android:fromXDelta="0"
        android:duration="1000"
        android:startOffset="1000"
        android:toXDelta="-500"/>
 
</set>

Animation animation1 = AnimationUtils.loadAnimation(this, R.anim.translation);
                image.startAnimation(animation1);

2.属性动画

 ObjectAnimator objectAnimator1 = ObjectAnimator.ofFloat(image, "translationX", 0, 300.0f, 0f);
                objectAnimator1.setRepeatCount(2);
                objectAnimator1.setDuration(1000);
                objectAnimator1.start();

旋转
普通动画

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

Animation animation3 = AnimationUtils.loadAnimation(this, R.anim.rotate);
                animation3.setDuration(1000);
                image.startAnimation(animation3);

属性动画

ObjectAnimator objectAnimator3 = ObjectAnimator.ofFloat(image, “rotation”, 0f, 360f);
objectAnimator3.setDuration(1000);
objectAnimator3.start();
大小
1.普通动画

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <scale
        android:fromXScale="0"
        android:fromYScale="0"
        android:toXScale="1"
        android:toYScale="1"
        android:pivotX="50%"
        android:pivotY="50%"/>
</set>

 Animation animation2 = AnimationUtils.loadAnimation(this, R.anim.scale);
                animation2.setDuration(1000);
                image.startAnimation(animation2);

2.属性动画

 ObjectAnimator objectAnimator2 = ObjectAnimator.ofFloat(image, "scaleX", 0f, 1.0f);
                ObjectAnimator objectAnimator4 = ObjectAnimator.ofFloat(image, "scaleY", 0f, 1.0f);
                //组合动画
                AnimatorSet animatorSet = new AnimatorSet();
                animatorSet.setDuration(1000);
                animatorSet.play(objectAnimator2).with(objectAnimator4);
                animatorSet.start();

组合动画
实现一个效果,就是先透明度变化并旋转一圈,然后平移一段距离又回来

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <alpha
        android:duration="1000"
        android:fromAlpha="0"
        android:toAlpha="1" />
 
    <rotate
        android:duration="1000"
        android:fromDegrees="0"
        android:pivotX="50%"
        android:pivotY="50%"
        android:toDegrees="360" />
    <translate
        android:duration="1000"
        android:fromXDelta="0"
        android:startOffset="1000"
        android:toXDelta="500" />
    <translate
        android:duration="1000"
        android:fromXDelta="0"
        android:startOffset="2000"
        android:toXDelta="-500" />
</set>

Animation animation4 = AnimationUtils.loadAnimation(this, R.anim.combination);
                image.startAnimation(animation4);

属性动画

 ObjectAnimator anim_alpha = ObjectAnimator.ofFloat(image, "alpha", 0f, 1.0f);
                ObjectAnimator anim_rotation = ObjectAnimator.ofFloat(image, "rotation", 0f, 360f);
                ObjectAnimator anim_translation = ObjectAnimator.ofFloat(image, "translationX", 0f, 500f);
                ObjectAnimator anim_translation1 = ObjectAnimator.ofFloat(image, "translationX", 500f, 0f);
                //用了两个set
                AnimatorSet animatorSet1 = new AnimatorSet();
                animatorSet1.play(anim_alpha).with(anim_rotation);
                animatorSet1.setDuration(1000);
                animatorSet1.start();
 
                AnimatorSet animatorSet2 = new AnimatorSet();
                animatorSet2.play(anim_translation).before(anim_translation1);
                animatorSet2.setDuration(1000).setStartDelay(1000);
                animatorSet2.start();