Android对话框内AnimatorSet/ObjectAnimator动画卡顿问题求证

Problem Description #

我最近通过手动测试对比了动画在不同容器中的表现：在DialogFragment或AlertDialog内使用AnimatorSet.playTogether()和ObjectAnimator实现的动画，明显比直接在Activity或普通Fragment布局中运行的相同动画卡顿、运行缓慢。这个差异直接影响了用户体验，想请大家帮忙定位和确认这个问题的根源。

Reproduction Steps #

1. 创建一个简单的布局文件（命名为layout_anim_test.xml）：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical">

    <View
        android:id="@+id/test_view"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:background="#FF4081" />

    <Button
        android:id="@+id/start_anim_btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Start Animation" />
</LinearLayout>

2. 实现完全相同的动画逻辑，分别在三种容器中运行：

   • 场景1：Activity中直接加载布局

   class AnimTestActivity : AppCompatActivity() {
       override fun onCreate(savedInstanceState: Bundle?) {
           super.onCreate(savedInstanceState)
           setContentView(R.layout.layout_anim_test)
           findViewById<Button>(R.id.start_anim_btn).setOnClickListener {
               startAnimation(findViewById(R.id.test_view))
           }
       }
   
       private fun startAnimation(view: View) {
           val scaleX = ObjectAnimator.ofFloat(view, "scaleX", 1f, 2f, 1f)
           val scaleY = ObjectAnimator.ofFloat(view, "scaleY", 1f, 2f, 1f)
           val alpha = ObjectAnimator.ofFloat(view, "alpha", 1f, 0.5f, 1f)
           AnimatorSet().apply {
               playTogether(scaleX, scaleY, alpha)
               duration = 1000
               start()
           }
       }
   }
   

   • 场景2：普通Fragment中加载布局

   class AnimTestFragment : Fragment() {
       override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
           return inflater.inflate(R.layout.layout_anim_test, container, false)
       }
   
       override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
           super.onViewCreated(view, savedInstanceState)
           view.findViewById<Button>(R.id.start_anim_btn).setOnClickListener {
               startAnimation(view.findViewById(R.id.test_view))
           }
       }
   
       private fun startAnimation(view: View) {
           // 和Activity中完全一致的动画代码
           val scaleX = ObjectAnimator.ofFloat(view, "scaleX", 1f, 2f, 1f)
           val scaleY = ObjectAnimator.ofFloat(view, "scaleY", 1f, 2f, 1f)
           val alpha = ObjectAnimator.ofFloat(view, "alpha", 1f, 0.5f, 1f)
           AnimatorSet().apply {
               playTogether(scaleX, scaleY, alpha)
               duration = 1000
               start()
           }
       }
   }
   

   • 场景3：DialogFragment中加载布局

   class AnimTestDialogFragment : DialogFragment() {
       override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
           return inflater.inflate(R.layout.layout_anim_test, container, false)
       }
   
       override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
           super.onViewCreated(view, savedInstanceState)
           view.findViewById<Button>(R.id.start_anim_btn).setOnClickListener {
               startAnimation(view.findViewById(R.id.test_view))
           }
       }
   
       private fun startAnimation(view: View) {
           // 完全相同的动画实现
           val scaleX = ObjectAnimator.ofFloat(view, "scaleX", 1f, 2f, 1f)
           val scaleY = ObjectAnimator.ofFloat(view, "scaleY", 1f, 2f, 1f)
           val alpha = ObjectAnimator.ofFloat(view, "alpha", 1f, 0.5f, 1f)
           AnimatorSet().apply {
               playTogether(scaleX, scaleY, alpha)
               duration = 1000
               start()
           }
       }
   }
   

3. 分别运行三个场景，点击按钮启动动画，对比流畅度：

   • Activity和普通Fragment中的动画流畅无卡顿
   • DialogFragment/AlertDialog中的动画明显卡顿，播放速度偏慢

What I've Tried So Far #

• 确认所有场景的动画duration参数完全一致，没有在对话框中被意外修改
• 尝试关闭对话框的背景模糊、阴影效果，卡顿情况略有缓解但未彻底解决
• 在多款中高端Android设备上测试，均能复现此问题

Questions #

1. 为什么DialogFragment/AlertDialog中的AnimatorSet动画会出现卡顿、速度缓慢的情况？
2. 有没有可行的优化方案或修复方法，能让对话框内的动画达到和Activity中相同的流畅度？

内容的提问来源于stack exchange，提问作者raitucarp