Initial commit

app/.gitignore

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+/build

app/build.gradle

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+apply plugin: 'com.android.application'
+
+apply plugin: 'kotlin-android'
+
+apply plugin: 'kotlin-android-extensions'
+
+android {
+    compileSdkVersion 28
+    defaultConfig {
+        applicationId "pl.marcin.androidviewstate"
+        minSdkVersion 21
+        targetSdkVersion 28
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    implementation "androidx.core:core-ktx:1.0.1"
+    implementation "androidx.appcompat:appcompat:1.0.2"
+}

app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

app/src/androidTest/java/pl/marcin/androidviewstate/ExampleInstrumentedTest.kt

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+package pl.marcin.androidviewstate
+
+import android.support.test.InstrumentationRegistry
+import android.support.test.runner.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getTargetContext()
+        assertEquals("pl.marcin.androidviewstate", appContext.packageName)
+    }
+}

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="pl.marcin.androidviewstate">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme">
+        <activity
+            android:name=".MainActivity"
+            android:windowSoftInputMode="stateHidden">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

app/src/main/java/pl/marcin/androidviewstate/CustomSwitchView.kt

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+package pl.marcin.androidviewstate
+
+import android.content.Context
+import android.content.res.TypedArray
+import android.os.Bundle
+import android.os.Parcelable
+import android.util.AttributeSet
+import android.util.Log
+import android.view.LayoutInflater
+import android.widget.FrameLayout
+
+class CustomSwitchView: FrameLayout {
+
+    constructor(context: Context) : super(context)
+    constructor(context: Context, attrs: AttributeSet?) : super(context, attrs)
+    constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int) : super(context, attrs, defStyleAttr)
+
+    init {
+        LayoutInflater.from(context).inflate(R.layout.view_custom_switch, this)
+    }
+
+    override fun onSaveInstanceState(): Parcelable? {
+        Log.i("Normal", "onSaveInstanceState")
+        return super.onSaveInstanceState()
+    }
+
+    override fun onRestoreInstanceState(state: Parcelable?) {
+        Log.i("Normal", "onRestoreInstanceState")
+        super.onRestoreInstanceState(state)
+    }
+}

app/src/main/java/pl/marcin/androidviewstate/CustomSwitchViewHandleState.kt

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+package pl.marcin.androidviewstate
+
+import android.content.Context
+import android.content.res.TypedArray
+import android.os.Bundle
+import android.os.Parcelable
+import android.util.AttributeSet
+import android.util.Log
+import android.util.SparseArray
+import android.view.LayoutInflater
+import android.widget.FrameLayout
+
+class CustomSwitchViewHandleState: FrameLayout {
+
+    constructor(context: Context) : super(context)
+    constructor(context: Context, attrs: AttributeSet?) : super(context, attrs)
+    constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int) : super(context, attrs, defStyleAttr)
+
+    init {
+        LayoutInflater.from(context).inflate(R.layout.view_custom_switch, this)
+    }
+
+    override fun dispatchSaveInstanceState(container: SparseArray<Parcelable>) {
+        dispatchFreezeSelfOnly(container)
+    }
+
+    override fun dispatchRestoreInstanceState(container: SparseArray<Parcelable>) {
+        dispatchThawSelfOnly(container)
+    }
+
+    override fun onSaveInstanceState(): Parcelable? {
+        Log.i("ByHand", "onSaveInstanceState")
+        return Bundle().apply {
+            Log.i("ByHand", "Writing children state to sparse array")
+            putParcelable(SUPER_STATE_KEY, super.onSaveInstanceState())
+            putSparseParcelableArray(SPARSE_STATE_KEY, saveChildViewStates())
+        }
+    }
+
+    override fun onRestoreInstanceState(state: Parcelable?) {
+        Log.i("ByHand", "onRestoreInstanceState")
+        var newState = state
+        if (newState is Bundle) {
+            Log.i("ByHand", "Reading children children state from sparse array")
+            val childrenState = newState.getSparseParcelableArray<Parcelable>(SPARSE_STATE_KEY)
+            childrenState?.let { restoreChildViewStates(it) }
+            newState = newState.getParcelable(SUPER_STATE_KEY)
+        }
+        super.onRestoreInstanceState(newState)
+    }
+
+    companion object {
+        private const val SPARSE_STATE_KEY = "SPARSE_STATE_KEY"
+        private const val SUPER_STATE_KEY = "SUPER_STATE_KEY"
+    }
+}

app/src/main/java/pl/marcin/androidviewstate/CustomSwitchViewHandleStateSavedState.kt

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+package pl.marcin.androidviewstate
+
+import android.content.Context
+import android.os.Parcel
+import android.os.Parcelable
+import android.util.AttributeSet
+import android.view.LayoutInflater
+import android.widget.FrameLayout
+import android.util.SparseArray
+import android.util.Log
+
+
+class CustomSwitchViewHandleStateSavedState: FrameLayout {
+
+    constructor(context: Context) : super(context)
+    constructor(context: Context, attrs: AttributeSet?) : super(context, attrs)
+    constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int) : super(context, attrs, defStyleAttr)
+
+    init {
+        LayoutInflater.from(context).inflate(R.layout.view_custom_switch, this)
+    }
+
+    public override fun onSaveInstanceState(): Parcelable? {
+        Log.i("SavedState", "onSaveInstanceState")
+        return SavedState(super.onSaveInstanceState()).apply {
+            childrenStates = saveChildViewStates()
+        }
+    }
+
+    public override fun onRestoreInstanceState(state: Parcelable) {
+        Log.i("SavedState", "onRestoreInstanceState")
+        when (state) {
+            is SavedState -> {
+                super.onRestoreInstanceState(state.superState)
+                state.childrenStates?.let { restoreChildViewStates(it) }
+            }
+            else -> super.onRestoreInstanceState(state)
+        }
+    }
+
+    override fun dispatchSaveInstanceState(container: SparseArray<Parcelable>) {
+        dispatchFreezeSelfOnly(container)
+    }
+
+    override fun dispatchRestoreInstanceState(container: SparseArray<Parcelable>) {
+        dispatchThawSelfOnly(container)
+    }
+
+    internal class SavedState : BaseSavedState {
+
+        internal var childrenStates: SparseArray<Parcelable>? = null
+
+        constructor(superState: Parcelable?) : super(superState)
+
+        @Suppress("UNCHECKED_CAST")
+        constructor(source: Parcel) : super(source) {
+            Log.i("SavedState", "Reading children children state from sparse array")
+            childrenStates = source.readSparseArray(javaClass.classLoader) as SparseArray<Parcelable>?
+        }
+
+        @Suppress("UNCHECKED_CAST")
+        override fun writeToParcel(out: Parcel, flags: Int) {
+            Log.i("SavedState", "Writing children state to sparse array")
+            super.writeToParcel(out, flags)
+            out.writeSparseArray(childrenStates as SparseArray<Any>)
+        }
+
+        companion object {
+            @Suppress("UNUSED")
+            @JvmField
+            val CREATOR = object : Parcelable.Creator<SavedState> {
+                override fun createFromParcel(source: Parcel) = SavedState(source)
+                override fun newArray(size: Int): Array<SavedState?> = arrayOfNulls(size)
+            }
+        }
+    }
+}

app/src/main/java/pl/marcin/androidviewstate/CustomSwitchViewNoId.kt

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+package pl.marcin.androidviewstate
+
+import android.content.Context
+import android.content.res.TypedArray
+import android.os.Bundle
+import android.os.Parcelable
+import android.util.AttributeSet
+import android.util.Log
+import android.view.LayoutInflater
+import android.widget.FrameLayout
+
+class CustomSwitchViewNoId: FrameLayout {
+
+    constructor(context: Context) : super(context)
+    constructor(context: Context, attrs: AttributeSet?) : super(context, attrs)
+    constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int) : super(context, attrs, defStyleAttr)
+
+    init {
+        LayoutInflater.from(context).inflate(R.layout.view_custom_switch_no_id, this)
+    }
+
+    override fun onSaveInstanceState(): Parcelable? {
+//        Log.i("Normal", "onSaveInstanceState")
+        return super.onSaveInstanceState()
+    }
+
+    override fun onRestoreInstanceState(state: Parcelable?) {
+//        Log.i("Normal", "onRestoreInstanceState")
+        super.onRestoreInstanceState(state)
+    }
+}

app/src/main/java/pl/marcin/androidviewstate/MainActivity.kt

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+package pl.marcin.androidviewstate
+
+import android.os.Bundle
+import android.util.Log
+import android.util.SparseArray
+import androidx.appcompat.app.AppCompatActivity
+
+class MainActivity : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+    }
+}

app/src/main/java/pl/marcin/androidviewstate/ViewGroupExtensions.kt

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+package pl.marcin.androidviewstate
+
+import android.os.Parcelable
+import android.util.SparseArray
+import android.view.ViewGroup
+import androidx.core.view.children
+
+fun ViewGroup.saveChildViewStates(): SparseArray<Parcelable> {
+    val childViewStates = SparseArray<Parcelable>()
+    children.forEach { child -> child.saveHierarchyState(childViewStates) }
+    return childViewStates
+}
+
+fun ViewGroup.restoreChildViewStates(childViewStates: SparseArray<Parcelable>) {
+    children.forEach { child -> child.restoreHierarchyState(childViewStates) }
+}

app/src/main/res/drawable-v24/ic_launcher_foreground.xml

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+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillType="evenOdd"
+        android:pathData="M32,64C32,64 38.39,52.99 44.13,50.95C51.37,48.37 70.14,49.57 70.14,49.57L108.26,87.69L108,109.01L75.97,107.97L32,64Z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="78.5885"
+                android:endY="90.9159"
+                android:startX="48.7653"
+                android:startY="61.0927"
+                android:type="linear">
+                <item
+                    android:color="#44000000"
+                    android:offset="0.0" />
+                <item
+                    android:color="#00000000"
+                    android:offset="1.0" />
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path
+        android:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        android:pathData="M66.94,46.02L66.94,46.02C72.44,50.07 76,56.61 76,64L32,64C32,56.61 35.56,50.11 40.98,46.06L36.18,41.19C35.45,40.45 35.45,39.3 36.18,38.56C36.91,37.81 38.05,37.81 38.78,38.56L44.25,44.05C47.18,42.57 50.48,41.71 54,41.71C57.48,41.71 60.78,42.57 63.68,44.05L69.11,38.56C69.84,37.81 70.98,37.81 71.71,38.56C72.44,39.3 72.44,40.45 71.71,41.19L66.94,46.02ZM62.94,56.92C64.08,56.92 65,56.01 65,54.88C65,53.76 64.08,52.85 62.94,52.85C61.8,52.85 60.88,53.76 60.88,54.88C60.88,56.01 61.8,56.92 62.94,56.92ZM45.06,56.92C46.2,56.92 47.13,56.01 47.13,54.88C47.13,53.76 46.2,52.85 45.06,52.85C43.92,52.85 43,53.76 43,54.88C43,56.01 43.92,56.92 45.06,56.92Z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000" />
+</vector>