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();

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