AndroidX : Parcelable encountered IOException writing serializable object only in Android version 10 devices

Question

I got Parcelable encountered IOException writing serializable object and it caused by java.io.NotSerializableException: androidx.appcompat.widget.Toolbar error only in Android Version 10 devices.

I've searched many results for getting solutions to this problem but every solution I got, was telling to define implement serializable in both inner class and sub inner class and I've done it, still, I got this error only in Android version 10 devices.

If I will use transient this keyword to define View or object then this error will fix but this same error comes with another view, adapter, and class.

Logcat

java.lang.RuntimeException: Parcelable encountered IOException writing serializable object (name = com.android.ui.fragment.CustomViewFragment)
        at android.os.Parcel.writeSerializable(Parcel.java:1850)
        at android.os.Parcel.writeValue(Parcel.java:1797)
        at android.os.Parcel.writeArrayMapInternal(Parcel.java:945)
        at android.os.BaseBundle.writeToParcelInner(BaseBundle.java:1584)
        at android.os.Bundle.writeToParcel(Bundle.java:1253)
        at android.os.Parcel.writeBundle(Parcel.java:1014)
        at android.content.Intent.writeToParcel(Intent.java:11155)
        at android.app.IActivityTaskManager$Stub$Proxy.startAppLockService(IActivityTaskManager.java:8468)
        at android.app.Activity.startAppLockService(Activity.java:8950)
        at android.app.Activity.performStart(Activity.java:8022)
        at android.app.ActivityThread.handleStartActivity(ActivityThread.java:3512)
        at android.app.servertransaction.TransactionExecutor.performLifecycleSequence(TransactionExecutor.java:221)
        at android.app.servertransaction.TransactionExecutor.cycleToPath(TransactionExecutor.java:201)
        at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:173)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2175)
        at android.os.Handler.dispatchMessage(Handler.java:107)
        at android.os.Looper.loop(Looper.java:237)
        at android.app.ActivityThread.main(ActivityThread.java:7860)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1075)
     Caused by: java.io.NotSerializableException: androidx.appcompat.widget.Toolbar
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1240)
        at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1604)
        at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1565)
        at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1488)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1234)
        at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1604)
        at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1565)
        at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1488)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1234)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:354)
        at android.os.Parcel.writeSerializable(Parcel.java:1845)
        at android.os.Parcel.writeValue(Parcel.java:1797) 
        at android.os.Parcel.writeArrayMapInternal(Parcel.java:945) 
        at android.os.BaseBundle.writeToParcelInner(BaseBundle.java:1584) 
        at android.os.Bundle.writeToParcel(Bundle.java:1253) 
        at android.os.Parcel.writeBundle(Parcel.java:1014) 
        at android.content.Intent.writeToParcel(Intent.java:11155) 
        at android.app.IActivityTaskManager$Stub$Proxy.startAppLockService(IActivityTaskManager.java:8468) 
        at android.app.Activity.startAppLockService(Activity.java:8950) 
        at android.app.Activity.performStart(Activity.java:8022) 
        at android.app.ActivityThread.handleStartActivity(ActivityThread.java:3512) 
        at android.app.servertransaction.TransactionExecutor.performLifecycleSequence(TransactionExecutor.java:221) 
        at android.app.servertransaction.TransactionExecutor.cycleToPath(TransactionExecutor.java:201) 
        at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:173) 
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2175) 
        at android.os.Handler.dispatchMessage(Handler.java:107) 
        at android.os.Looper.loop(Looper.java:237) 
        at android.app.ActivityThread.main(ActivityThread.java:7860) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1075) 

Activity.java

   public class BaseFragmentActivity extends AppCompatActivity implements Serializable, View.OnClickListener {
    
        private static final String TAG = "BaseFragmentActivity";
        private Toolbar mToolbar;
        private ImageView tBtnSave, tBtnBack;
        private TextView tTxtTitle;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_base_fragment);
    
            mToolbar = findViewById(R.id.toolbar);
            tBtnSave = findViewById(R.id.toolbar_btn_save);
            tBtnBack = findViewById(R.id.toolbarBtnBack);
            tTxtTitle = findViewById(R.id.toolbar_title);
        }

        ...
}

build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    defaultConfig {
        applicationId "com.android.app"
        minSdkVersion 21
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        vectorDrawables.useSupportLibrary = true
        multiDexEnabled true
    }
    buildTypes {
        debug {
            debuggable true
            buildConfigField "Boolean", "DEBUG_MODE", "true"
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:support-annotations:28.0.0'
    annotationProcessor 'com.android.support:support-annotations:28.0.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'com.google.android.material:material:1.1.0'

    implementation 'com.google.code.gson:gson:2.8.5'
    implementation 'com.github.bumptech.glide:glide:4.11.0'
    annotationProcessor 'com.github.bumptech.glide:compiler:4.11.0'
    implementation 'com.android.volley:volley:1.1.1'
    implementation 'androidx.palette:palette:1.0.0'

    //External Animation Library
    implementation 'com.airbnb.android:lottie:3.4.1'

    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
}

Edit and Fixed.

public class BaseFragmentActivity extends AppCompatActivity implements Serializable, View.OnClickListener {
    
        // By using `transient` keyword to define view or class to say it's not serialized view or class.

        private static final String TAG = "BaseFragmentActivity";
        private transient Toolbar mToolbar;
        private transient AppCompatImageView tBtnSave, tBtnBack;
        private transient AppCompatTextView tTxtTitle;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_base_fragment);
    
            mToolbar = findViewById(R.id.toolbar);
            tBtnSave = findViewById(R.id.toolbar_btn_save);
            tBtnBack = findViewById(R.id.toolbarBtnBack);
            tTxtTitle = findViewById(R.id.toolbar_title);
        }

        ...
}

Answer 1

Here Is Your Solution :

transient is a variables modifier used in serialization. At the time of serialization, if we don't want to save value of a particular variable in a file, then we use transient keyword. When JVM comes across transient keyword, it ignores original value of the variable and save default value of that variable data type.

So, it uses quite rare in order to say to your compiler that this variable is not a part of serializable mathod.

Answer 2

Looks like somewhere in your code, you are trying to write a whole Fragment (looks like it is CustomViewFragment) to parcel:

java.lang.RuntimeException: Parcelable encountered IOException writing serializable object (name = com.android.ui.fragment.CustomViewFragment)

To be serializable your class and all its members have to implement Serializable. Because Fragment's context is Activity (that is probably a subclass of BaseFragmentActivity) it also goes through the process of serialization. But neither Fragment nor Activity implements Serializable interface.