封面动画_旋转

方法1

主函数

ObjectAnimator animator = ObjectAnimator.ofFloat(findViewById(R.id.image_view),
                "rotation", 0, 360);
animator.setRepeatCount(ValueAnimator.INFINITE);
animator.setInterpolator(new LinearInterpolator());
animator.setDuration(8000);
animator.setRepeatMode(ValueAnimator.RESTART);
animator.start();

layout里面的XML

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".animation.RotationPropertyActivity">

    <ImageView
        android:id="@+id/image_view"
        android:layout_gravity="center"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@mipmap/ic_launcher_round"/>

</FrameLayout>

方法2

主函数

Animator animator = AnimatorInflater.loadAnimator(this, R.animator.rotate);
animator.setTarget(findViewById(R.id.image_view));
animator.start();

res/animator/rotate.xml

<?xml version="1.0" encoding="utf-8"?>
<objectAnimator xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="8000"
    android:propertyName="rotation"
    android:interpolator="@android:anim/linear_interpolator"
    android:repeatCount="infinite"
    android:repeatMode="restart"
    android:valueFrom="0"
    android:valueTo="360" />

layout里xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".animation.RotationPropertyActivity">

    <ImageView
        android:id="@+id/image_view"
        android:layout_gravity="center"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@mipmap/ic_launcher_round"/>

</FrameLayout>