先日 [メモリリークのついての質問](https://ja.stackoverflow.com/q/95522)
をさせていただき、その時点での問題は解決できたのですが、その後 Activity または Fragment のレイアウトXMLにて ScrollView
または RecyclerView を配置するとメモリリークが起きてしまうことが判明しました。

これについても、手元にある端末のうち AQUOS sense6s(SH-RM19s) でのみ発生するようです。

原因を探るため、試しに必要最低限の内容のみの Activity 2つで構成したアプリを作成しました。  
2つ目の Activity のレイアウトXMLに ScrollView を設置しています。  
これを起動し、1つ目の Activity から2つ目の Activity に遷移して戻るボタンで1つ目の Activity に戻ると、LeakCanary
でメモリリークが検出されます。

Android13 に起因するものかもしれないと考え Android13 のエミュレータでも実行してみましたが、メモリリークは起こりませんでした。

自分ではどこに原因があるのか全く見当がつかない状態ですので、何か少しでもわかる方がいらっしゃいましたらぜひよろしくお願いいたします。

~追記~  
ちなみに gradle:app の dependencies から LeakCanary
を削除して実行しても下画面のように結果は同じですので、LeakCanary の問題ではないようです。

[![画像の説明をここに入力](https://i.stack.imgur.com/X2T7j.png)](https://i.stack.imgur.com/X2T7j.png)

build.gradle(:app)

```

    plugins {
        id 'com.android.application'
        id 'org.jetbrains.kotlin.android'
    }
    
    android {
        namespace 'com.example.recyclerviewtestapplication'
        compileSdk 33
    
        defaultConfig {
            applicationId "com.example.recyclerviewtestapplication"
            minSdk 24
            targetSdk 33
            versionCode 1
            versionName "1.0"
    
            testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
            vectorDrawables {
                useSupportLibrary true
            }
        }
    
        buildTypes {
            release {
                minifyEnabled false
                proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
            }
        }
        compileOptions {
            sourceCompatibility JavaVersion.VERSION_1_8
            targetCompatibility JavaVersion.VERSION_1_8
        }
        kotlinOptions {
            jvmTarget = '1.8'
        }
        buildFeatures {
            compose true
        }
        composeOptions {
            kotlinCompilerExtensionVersion '1.3.2'
        }
        packagingOptions {
            resources {
                excludes += '/META-INF/{AL2.0,LGPL2.1}'
            }
        }
    }
    
    dependencies {
    
        implementation 'androidx.core:core-ktx:1.8.0'
        implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.4.1'
        implementation 'androidx.activity:activity-compose:1.6.1'
        implementation platform('androidx.compose:compose-bom:2022.10.00')
        implementation 'androidx.compose.ui:ui'
        implementation 'androidx.compose.ui:ui-graphics'
        implementation 'androidx.compose.ui:ui-tooling-preview'
        implementation 'androidx.compose.material3:material3'
        implementation 'androidx.recyclerview:recyclerview:1.3.0'
        implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
        implementation 'androidx.fragment:fragment:1.4.1'
        testImplementation 'junit:junit:4.13.2'
        androidTestImplementation 'androidx.test.ext:junit:1.1.5'
        androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
        androidTestImplementation platform('androidx.compose:compose-bom:2022.10.00')
        androidTestImplementation 'androidx.compose.ui:ui-test-junit4'
        debugImplementation 'androidx.compose.ui:ui-tooling'
        debugImplementation 'androidx.compose.ui:ui-test-manifest'
    
        debugImplementation 'com.squareup.leakcanary:leakcanary-android:2.9.1'
    }
    
    
```

マニフェスト

```

    <?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools">
    
        <application
            android:allowBackup="true"
            android:dataExtractionRules="@xml/data_extraction_rules"
            android:fullBackupContent="@xml/backup_rules"
            android:icon="@mipmap/ic_launcher"
            android:label="@string/app_name"
            android:roundIcon="@mipmap/ic_launcher_round"
            android:supportsRtl="true"
            android:theme="@style/Theme.RecyclerViewTestApplication"
            tools:targetApi="31">
            <activity android:name=".ui.theme.MainActivity"
                android:exported="true">
                <intent-filter>
                    <action android:name="android.intent.action.MAIN" />
    
                    <category android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
            </activity>
            <activity android:name=".ui.theme.TestActivity"
                android:exported="true">
            </activity>
        </application>
    
    </manifest>
    
```

遷移元のアクティビティ

```

    package com.example.recyclerviewtestapplication.ui.theme;
    
    import android.app.Activity;
    import android.content.Intent;
    import android.os.Bundle;
    import android.widget.Button;
    
    import androidx.annotation.Nullable;
    
    import com.example.recyclerviewtestapplication.R;
    
    public class MainActivity extends Activity {
    
        @Override
        protected void onCreate(@Nullable Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            Button button = findViewById(R.id.button);
    
            button.setOnClickListener(v -> {
                // TestActivity に遷移
                Intent intent = new Intent(this, TestActivity.class);
                startActivity(intent);
            });
        }
    }
    
```

遷移元のレイアウト

```

    <?xml version="1.0" encoding="utf-8"?>
    <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    
        <Button
            android:id="@+id/button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="32dp"
            android:text="Move"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />
    </androidx.constraintlayout.widget.ConstraintLayout>
    
```

遷移先のアクティビティ

```

    package com.example.recyclerviewtestapplication.ui.theme;
    
    import android.app.Activity;
    import android.os.Bundle;
    
    import androidx.annotation.Nullable;
    
    import com.example.recyclerviewtestapplication.R;
    
    public class TestActivity extends Activity {
    
        @Override
        public void onCreate(@Nullable Bundle savedInstanceState) {
    
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_test);
        }
    }
    
    
```

遷移先のレイアウト

```

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">
    
        <!--<FrameLayout
            android:id="@+id/fragment_container"
            android:layout_width="match_parent"
            android:layout_height="match_parent">
    
        </FrameLayout>-->
    
        <!-- メモリリーク発生 -->
        <ScrollView
            android:layout_width="match_parent"
            android:layout_height="match_parent">
    
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical" >
    
                <TextView
                    android:id="@+id/textView"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="TextView" />
    
                <TextView
                    android:id="@+id/textView2"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="TextView" />
            </LinearLayout>
        </ScrollView>
    
    </LinearLayout>
    
```

メモリリーク発生までのログ

```

    2023-07-11 04:23:44.852  9322-9361  LeakCanary              com...e.recyclerviewtestapplication  D  LeakCanary is running and ready to detect memory leaks.
    2023-07-11 04:23:51.804  9322-9344  System                  com...e.recyclerviewtestapplication  W  A resource failed to call close. 
    2023-07-11 04:23:51.968  9322-9425  ProfileInstaller        com...e.recyclerviewtestapplication  D  Installing profile for com.example.recyclerviewtestapplication
    2023-07-11 04:24:06.428  9322-9362  AdrenoGLES-0            com...e.recyclerviewtestapplication  I  QUALCOMM build                   : cac6e6f805, I5187d04b75
                                                                                                        Build Date                       : 11/22/21
                                                                                                        OpenGL ES Shader Compiler Version: EV031.35.01.10
                                                                                                        Local Branch                     : 
                                                                                                        Remote Branch                    : 
                                                                                                        Remote Branch                    : 
                                                                                                        Reconstruct Branch               : 
    2023-07-11 04:24:06.428  9322-9362  AdrenoGLES-0            com...e.recyclerviewtestapplication  I  Build Config                     : S P 10.0.7 AArch64
    2023-07-11 04:24:06.428  9322-9362  AdrenoGLES-0            com...e.recyclerviewtestapplication  I  Driver Path                      : /vendor/lib64/egl/libGLESv2_adreno.so
    2023-07-11 04:24:06.516  9322-9362  AdrenoGLES-0            com...e.recyclerviewtestapplication  I  PFP: 0x016ee201, ME: 0x00000000
    2023-07-11 04:24:07.034  9322-9362  Parcel                  com...e.recyclerviewtestapplication  W  Expecting binder but got null!
    2023-07-11 04:24:07.037  9322-9322  Choreographer           com...e.recyclerviewtestapplication  I  Skipped 38 frames!  The application may be doing too much work on its main thread.
    2023-07-11 04:24:07.053  9322-9347  OpenGLRenderer          com...e.recyclerviewtestapplication  I  Davey! duration=727ms; Flags=1, FrameTimelineVsyncId=131891258, IntendedVsync=1284455148176085, Vsync=1284455148176085, InputEventId=0, HandleInputStart=1284455160179027, AnimationStart=1284455160181631, PerformTraversalsStart=1284455160182412, DrawStart=1284455745678766, FrameDeadline=1284455164842751, FrameInterval=1284455160165121, FrameStartTime=16649441, SyncQueued=1284455761423089, SyncStart=1284455761603558, IssueDrawCommandsStart=1284455762601579, SwapBuffers=1284455873589339, FrameCompleted=1284455875854756, DequeueBufferDuration=24106562, QueueBufferDuration=359948, GpuCompleted=1284455875854756, SwapBuffersCompleted=1284455874544704, DisplayPresentTime=51011326586448, CommandSubmissionCompleted=1284455873589339, 
    2023-07-11 04:24:15.996  9322-9322  Compatibil...geReporter com...e.recyclerviewtestapplication  D  Compat change id reported: 171228096; UID 10437; state: ENABLED
    2023-07-11 04:24:16.106  9322-9362  Parcel                  com...e.recyclerviewtestapplication  W  Expecting binder but got null!
    2023-07-11 04:24:19.934  9322-9322  LeakCanary              com...e.recyclerviewtestapplication  D  Watching instance of com.example.recyclerviewtestapplication.ui.theme.TestActivity (com.example.recyclerviewtestapplication.ui.theme.TestActivity received Activity#onDestroy() callback) with key 136f7d8f-32a0-427d-8ead-9b5617359d00
    2023-07-11 04:24:27.341  9322-9361  testapplication         com...e.recyclerviewtestapplication  I  Explicit concurrent copying GC freed 7672(394KB) AllocSpace objects, 0(0B) LOS objects, 24% free, 2470KB/3293KB, paused 198us,40us total 40.057ms
    2023-07-11 04:24:27.451  9322-9361  LeakCanary              com...e.recyclerviewtestapplication  D  Found 1 object retained, dumping heap now (app is invisible)
    2023-07-11 04:24:27.556  9322-9361  LeakCanary              com...e.recyclerviewtestapplication  D  Removing 1 heap dumps
    2023-07-11 04:24:27.752  9322-9361  testapplication         com...e.recyclerviewtestapplication  I  hprof: heap dump "/storage/emulated/0/Download/leakcanary-com.example.recyclerviewtestapplication/2023-07-11_04-24-27_685.hprof" starting...
    2023-07-11 04:24:33.162  9322-9361  testapplication         com...e.recyclerviewtestapplication  I  hprof: heap dump completed (33MB) in 5.409s objects 478748 objects with stack traces 0
    2023-07-11 04:24:33.408  9322-9342  testapplication         com...e.recyclerviewtestapplication  I  WaitForGcToComplete blocked HeapTrim on Hprof for 1.066s
    2023-07-11 04:24:33.436  9322-10743 LeakCanary              com...e.recyclerviewtestapplication  D  Analysis in progress, 0% done, working on Parsing heap dump
    2023-07-11 04:24:41.157  9322-10743 LeakCanary              com...e.recyclerviewtestapplication  D  Analysis in progress, 10% done, working on Extracting metadata
    2023-07-11 04:24:47.993  9322-10743 LeakCanary              com...e.recyclerviewtestapplication  D  Analysis in progress, 20% done, working on Finding retained objects
    2023-07-11 04:24:48.001  9322-10743 LeakCanary              com...e.recyclerviewtestapplication  D  Analysis in progress, 30% done, working on Finding paths to retained objects
    2023-07-11 04:24:56.382  9322-10743 LeakCanary              com...e.recyclerviewtestapplication  D  Analysis in progress, 40% done, working on Finding dominators
    2023-07-11 04:25:24.152  9322-10743 LeakCanary              com...e.recyclerviewtestapplication  D  Found 1 paths to retained objects
    2023-07-11 04:25:24.153  9322-10743 LeakCanary              com...e.recyclerviewtestapplication  D  Analysis in progress, 50% done, working on Inspecting objects
    2023-07-11 04:25:24.170  9322-10743 LeakCanary              com...e.recyclerviewtestapplication  D  Analysis in progress, 60% done, working on Computing native retained size
    2023-07-11 04:25:24.175  9322-10743 LeakCanary              com...e.recyclerviewtestapplication  D  Analysis in progress, 70% done, working on Computing retained size
    2023-07-11 04:25:24.907  9322-10743 LeakCanary              com...e.recyclerviewtestapplication  D  Analysis in progress, 80% done, working on Building leak traces
    2023-07-11 04:25:24.923  9322-10743 LeakCanary              com...e.recyclerviewtestapplication  D  Analysis in progress, 90% done, working on Reporting heap analysis
    
    
```

LeakCanary のログ

```

    ====================================
    HEAP ANALYSIS RESULT
    ====================================
    1 APPLICATION LEAKS
    References underlined with "~~~" are likely causes.
    Learn more at https://squ.re/leaks.
    64948 bytes retained by leaking objects
    Signature: 1f48c2e3c9d42514de20b1df25c05a32d67be916
    ┬───
    │ GC Root: System class
    │
    ├─ com.qualcomm.qti.Performance class
    │    Leaking: NO (a class is never leaking)
    │    ↓ static Performance.mContext
    │                         ~~~~~~~~
    ╰→ com.example.recyclerviewtestapplication.ui.theme.TestActivity instance
    ​     Leaking: YES (ObjectWatcher was watching this because com.example.recyclerviewtestapplication.ui.t
    ​     TestActivity received Activity#onDestroy() callback and Activity#mDestroyed is true)
    ​     Retaining 64.9 kB in 854 objects
    ​     key = 136f7d8f-32a0-427d-8ead-9b5617359d00
    ​     watchDurationMillis = 7818
    ​     retainedDurationMillis = 2817
    ​     mApplication instance of android.app.Application
    ​     mBase instance of android.app.ContextImpl
    ====================================
    0 LIBRARY LEAKS
    A Library Leak is a leak caused by a known bug in 3rd party code that you do not have control over.
    See https://square.github.io/leakcanary/fundamentals-how-leakcanary-works/#4-categorizing-leaks
    ====================================
    0 UNREACHABLE OBJECTS
    An unreachable object is still in memory but LeakCanary could not find a strong reference path
    from GC roots.
    ====================================
    METADATA
    Please include this in bug reports and Stack Overflow questions.
    Build.VERSION.SDK_INT: 33
    Build.MANUFACTURER: SHARP
    LeakCanary version: 2.9.1
    App process name: com.example.recyclerviewtestapplication
    Class count: 22044
    Instance count: 167931
    Primitive array count: 120350
    Object array count: 21450
    Thread count: 19
    Heap total bytes: 22986679
    Bitmap count: 1
    Bitmap total bytes: 31945
    Large bitmap count: 0
    Large bitmap total bytes: 0
    Stats: LruCache[maxSize=3000,hits=106703,misses=166176,hitRate=39%]
    RandomAccess[bytes=8508532,reads=166176,travel=58166189200,range=27722169,size=34672205]
    Heap dump reason: 1 retained objects, app is not visible
    Analysis duration: 45342 ms
    Heap dump file path: /storage/emulated/0/Download/leakcanary-com.example.
    recyclerviewtestapplication/2023-07-11_04-24-27_685.hprof
    Heap dump timestamp: 1689017124920
    Heap dump duration: 5656 ms
    ====================================
    
```
CC BY-SA 4.0
2023-07-10T19:52:45.597
95557
2023-09-03T00:47:14.330
2023-07-11T06:26:16.533
57360
57360
question
java android android-layout
Android で、特定の端末でのみ ScrollView または RecyclerView を設置するとメモリリークが発生する