Sceneform - 如何修复泄漏的 SceneView？
Sceneform - How to fix leaking SceneView?
我使用 SceneView 加载 3D 模型已经将近一年了，但我一直不明白是什么导致了这种泄漏。我会实现 LeakCanary，但只有这一次泄漏，因为我不知道如何解决这个问题。
但现在我想弄清问题的根源并尝试解决它。我已经在 Sceneform 的两个版本上对其进行了测试——1.15.0 以及被 Google 1.17.1 弃用之前的最后一个版本，这两个版本都出现了这个问题。
当您在 Activity 或 Fragment 中使用 SceneView 加载模型（我都试过了）并且您通过执行 System home navigation 或通过 Recent tasks list.
切换到不同的应用程序
泄漏日志：
┬───
│ GC Root: System class
│
├─ android.app.ActivityThread class
│ Leaking: NO (MainActivity↓ is not leaking and a class is never leaking)
│ ↓ static ActivityThread.sCurrentActivityThread
├─ android.app.ActivityThread instance
│ Leaking: NO (MainActivity↓ is not leaking)
│ mInitialApplication instance of android.app.Application
│ ↓ ActivityThread.mActivities
├─ android.util.ArrayMap instance
│ Leaking: NO (MainActivity↓ is not leaking)
│ ↓ ArrayMap.mArray
├─ java.lang.Object[] array
│ Leaking: NO (MainActivity↓ is not leaking)
│ ↓ Object[].[1]
├─ android.app.ActivityThread$ActivityClientRecord instance
│ Leaking: NO (MainActivity↓ is not leaking)
│ activity instance of com.example.a3dmodeltester.MainActivity with
│ mDestroyed = false
│ ↓ ActivityThread$ActivityClientRecord.activity
├─ com.example.a3dmodeltester.MainActivity instance
│ Leaking: NO (SceneView↓ is not leaking and Activity#mDestroyed is false)
│ mApplication instance of android.app.Application
│ mBase instance of android.app.ContextImpl
│ ↓ MainActivity.sceneView
├─ com.google.ar.sceneform.SceneView instance
│ Leaking: NO (View attached)
│ View is part of a window view hierarchy
│ View.mAttachInfo is not null (view attached)
│ View.mID = R.id.sceneview
│ View.mWindowAttachCount = 1
│ mContext instance of com.example.a3dmodeltester.MainActivity with
│ mDestroyed = false
│ ↓ SceneView.renderer
│ ~~~~~~~~
├─ com.google.ar.sceneform.rendering.Renderer instance
│ Leaking: UNKNOWN
│ Retaining 2.9 kB in 38 objects
│ ↓ Renderer.viewAttachmentManager
│ ~~~~~~~~~~~~~~~~~~~~~
├─ com.google.ar.sceneform.rendering.ViewAttachmentManager instance
│ Leaking: UNKNOWN
│ Retaining 2.2 kB in 19 objects
│ ↓ ViewAttachmentManager.frameLayout
│ ~~~~~~~~~~~
╰→ android.widget.FrameLayout instance
Leaking: YES (ObjectWatcher was watching this because android.widget.
FrameLayout received View#onDetachedFromWindow() callback)
Retaining 1.9 kB in 15 objects
key = 10550463-895e-443a-898f-11c5131da209
watchDurationMillis = 5165
retainedDurationMillis = 157
View not part of a window view hierarchy
View.mAttachInfo is null (view detached)
View.mWindowAttachCount = 1
mContext instance of com.example.a3dmodeltester.MainActivity with
mDestroyed = false
METADATA
Build.VERSION.SDK_INT: 27
Build.MANUFACTURER: Google
LeakCanary version: 2.7
App process name: com.example.a3dmodeltester
Stats: LruCache[maxSize=3000,hits=892,misses=24408,hitRate=3%]
RandomAccess[bytes=1232425,reads=24408,travel=6462427001,range=8963521,size=1161
0814]
Heap dump reason: 1 retained objects, app is not visible
Analysis duration: 5411 ms
重现漏洞：
弃用前的最后一个版本：
implementation 'com.google.ar.sceneform.ux:sceneform-ux:1.17.1'
debugImplementation 'com.squareup.leakcanary:leakcanary-android:2.7'
我也试过 1.15.0
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.ar.sceneform.SceneView
android:id="@+id/sceneview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/white"/>
</RelativeLayout>
MainActivity（也测试过片段）
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
private static final Vector3 STARTING_CAMERA_POSITION = new Vector3(0f, 1f, 3f);
private SceneView sceneView;
private Node node;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sceneView = findViewById(R.id.sceneview);
Scene scene = sceneView.getScene();
node = new Node();
scene.addChild(node);
ModelRenderable.builder()
.setSource(this, Uri.parse("Andy.sfb"))
.build()
.thenAccept(renderable -> node.setRenderable(renderable))
.exceptionally(
throwable -> {
Log.e(TAG, "Unable to load Renderable.", throwable);
return null;
});
Camera camera = scene.getCamera();
camera.setWorldPosition(STARTING_CAMERA_POSITION);
}
@Override
public void onPause() {
super.onPause();
sceneView.pause();
}
@Override
public void onResume() {
super.onResume();
try {
sceneView.resume();
} catch (CameraNotAvailableException e) {
e.printStackTrace();
}
}
@Override
public void onDestroy() {
super.onDestroy();
sceneView.destroy();
}
}
.sfb 文件
https://drive.google.com/file/d/1NchJ2NGNM7NZzRZkq4fewALc7m4dnGG3/view?usp=sharing
要重现，请在 SceneView 为 运行
时按 Home 或 Recent task list 按钮
我也只用 SceneView 测试过它，但它也会泄漏。
我该如何解决这个漏洞？
我还在多个 API、模拟器和真实设备上对其进行了测试，并且它发生在所有这些设备上。
正如你所说的最后一个版本1.17.1
一些爱好者正在研究 maintained version。也许这个版本修复了您的内存泄漏问题。
我尝试了这些选项来阻止泄漏，但它们没有任何作用：
Scene scene = sceneView.getScene();
scene = null;
sceneView = null;
sceneView.destroy();
Renderer.destroyAllResources();
Renderer.reclaimReleasedResources();
然而，这为我修复了漏洞：
从
中删除sceneView.pause();
@Override
public void onPause()
在执行系统主页导航或通过“最近的任务”列表切换到其他应用程序时停止泄漏。 （OP 中的问题）
将 sceneView.pause(); 添加到
@Override
public void onDestroy()
在 activity 或片段被销毁时防止泄漏。
@Override
public void onDestroy() {
super.onDestroy();
sceneView.pause();
}
我使用 SceneView 加载 3D 模型已经将近一年了，但我一直不明白是什么导致了这种泄漏。我会实现 LeakCanary，但只有这一次泄漏，因为我不知道如何解决这个问题。
但现在我想弄清问题的根源并尝试解决它。我已经在 Sceneform 的两个版本上对其进行了测试——1.15.0 以及被 Google 1.17.1 弃用之前的最后一个版本，这两个版本都出现了这个问题。
当您在 Activity 或 Fragment 中使用 SceneView 加载模型（我都试过了）并且您通过执行 System home navigation 或通过 Recent tasks list.
泄漏日志：
┬───
│ GC Root: System class
│
├─ android.app.ActivityThread class
│ Leaking: NO (MainActivity↓ is not leaking and a class is never leaking)
│ ↓ static ActivityThread.sCurrentActivityThread
├─ android.app.ActivityThread instance
│ Leaking: NO (MainActivity↓ is not leaking)
│ mInitialApplication instance of android.app.Application
│ ↓ ActivityThread.mActivities
├─ android.util.ArrayMap instance
│ Leaking: NO (MainActivity↓ is not leaking)
│ ↓ ArrayMap.mArray
├─ java.lang.Object[] array
│ Leaking: NO (MainActivity↓ is not leaking)
│ ↓ Object[].[1]
├─ android.app.ActivityThread$ActivityClientRecord instance
│ Leaking: NO (MainActivity↓ is not leaking)
│ activity instance of com.example.a3dmodeltester.MainActivity with
│ mDestroyed = false
│ ↓ ActivityThread$ActivityClientRecord.activity
├─ com.example.a3dmodeltester.MainActivity instance
│ Leaking: NO (SceneView↓ is not leaking and Activity#mDestroyed is false)
│ mApplication instance of android.app.Application
│ mBase instance of android.app.ContextImpl
│ ↓ MainActivity.sceneView
├─ com.google.ar.sceneform.SceneView instance
│ Leaking: NO (View attached)
│ View is part of a window view hierarchy
│ View.mAttachInfo is not null (view attached)
│ View.mID = R.id.sceneview
│ View.mWindowAttachCount = 1
│ mContext instance of com.example.a3dmodeltester.MainActivity with
│ mDestroyed = false
│ ↓ SceneView.renderer
│ ~~~~~~~~
├─ com.google.ar.sceneform.rendering.Renderer instance
│ Leaking: UNKNOWN
│ Retaining 2.9 kB in 38 objects
│ ↓ Renderer.viewAttachmentManager
│ ~~~~~~~~~~~~~~~~~~~~~
├─ com.google.ar.sceneform.rendering.ViewAttachmentManager instance
│ Leaking: UNKNOWN
│ Retaining 2.2 kB in 19 objects
│ ↓ ViewAttachmentManager.frameLayout
│ ~~~~~~~~~~~
╰→ android.widget.FrameLayout instance
Leaking: YES (ObjectWatcher was watching this because android.widget.
FrameLayout received View#onDetachedFromWindow() callback)
Retaining 1.9 kB in 15 objects
key = 10550463-895e-443a-898f-11c5131da209
watchDurationMillis = 5165
retainedDurationMillis = 157
View not part of a window view hierarchy
View.mAttachInfo is null (view detached)
View.mWindowAttachCount = 1
mContext instance of com.example.a3dmodeltester.MainActivity with
mDestroyed = false
METADATA
Build.VERSION.SDK_INT: 27
Build.MANUFACTURER: Google
LeakCanary version: 2.7
App process name: com.example.a3dmodeltester
Stats: LruCache[maxSize=3000,hits=892,misses=24408,hitRate=3%]
RandomAccess[bytes=1232425,reads=24408,travel=6462427001,range=8963521,size=1161
0814]
Heap dump reason: 1 retained objects, app is not visible
Analysis duration: 5411 ms
重现漏洞：
弃用前的最后一个版本：
implementation 'com.google.ar.sceneform.ux:sceneform-ux:1.17.1'
debugImplementation 'com.squareup.leakcanary:leakcanary-android:2.7'
我也试过 1.15.0
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.ar.sceneform.SceneView
android:id="@+id/sceneview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/white"/>
</RelativeLayout>
MainActivity（也测试过片段）
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
private static final Vector3 STARTING_CAMERA_POSITION = new Vector3(0f, 1f, 3f);
private SceneView sceneView;
private Node node;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sceneView = findViewById(R.id.sceneview);
Scene scene = sceneView.getScene();
node = new Node();
scene.addChild(node);
ModelRenderable.builder()
.setSource(this, Uri.parse("Andy.sfb"))
.build()
.thenAccept(renderable -> node.setRenderable(renderable))
.exceptionally(
throwable -> {
Log.e(TAG, "Unable to load Renderable.", throwable);
return null;
});
Camera camera = scene.getCamera();
camera.setWorldPosition(STARTING_CAMERA_POSITION);
}
@Override
public void onPause() {
super.onPause();
sceneView.pause();
}
@Override
public void onResume() {
super.onResume();
try {
sceneView.resume();
} catch (CameraNotAvailableException e) {
e.printStackTrace();
}
}
@Override
public void onDestroy() {
super.onDestroy();
sceneView.destroy();
}
}
.sfb 文件
https://drive.google.com/file/d/1NchJ2NGNM7NZzRZkq4fewALc7m4dnGG3/view?usp=sharing
要重现，请在 SceneView 为 运行
Home 或 Recent task list 按钮
我也只用 SceneView 测试过它，但它也会泄漏。
我该如何解决这个漏洞？
我还在多个 API、模拟器和真实设备上对其进行了测试，并且它发生在所有这些设备上。
正如你所说的最后一个版本1.17.1 一些爱好者正在研究 maintained version。也许这个版本修复了您的内存泄漏问题。
我尝试了这些选项来阻止泄漏，但它们没有任何作用：
Scene scene = sceneView.getScene();
scene = null;
sceneView = null;
sceneView.destroy();
Renderer.destroyAllResources();
Renderer.reclaimReleasedResources();
然而，这为我修复了漏洞：
从
中删除sceneView.pause();
@Override
public void onPause()
在执行系统主页导航或通过“最近的任务”列表切换到其他应用程序时停止泄漏。 （OP 中的问题）
将 sceneView.pause(); 添加到
@Override
public void onDestroy()
在 activity 或片段被销毁时防止泄漏。
@Override
public void onDestroy() {
super.onDestroy();
sceneView.pause();
}