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POParcelable inside bundle which is added to Parcel
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  1. POParcelable inside bundle which is added to Parcel
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    copied!<p>In my project I have a model which holds basic information about model. For example lets say that the model is a Car. Then there are many different varieties of Cars and these have different data assigned to them. All models must be parcelables.</p> <p>The differences between different cars is very small, it might just be a few data fields. So this is solved by creating presenters (just a class that holds data) for the different cars. The presenter would then know which extra data it should hold. Because the the presenter itself is not parcelable it will have a Bundle for all its data which then the Car class will then add to the parcelable. I don't want to make the presenters into parcelables.</p> <p>So Car takes the Bundle from the presenter and puts it in its parcel:</p> <pre><code> public void writeToParcel(Parcel parcel, int flags) { parcel.writeBundle(getPresenter().getBundle()); } </code></pre> <p>And it will then unpack it with:</p> <pre><code> public Car(Parcel parcel) { getPresenter().setBundle(parcel.readBundle()); } </code></pre> <p>This works fine until a parcelable object is added to the bundle by the presenter. Then I get this error:</p> <pre><code>11-16 15:06:37.255: E/AndroidRuntime(15193): FATAL EXCEPTION: main 11-16 15:06:37.255: E/AndroidRuntime(15193): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example/com.example.activity}: android.os.BadParcelableException: ClassNotFoundException when unmarshalling: com.example.model.engine 11-16 15:06:37.255: E/AndroidRuntime(15193): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2185) 11-16 15:06:37.255: E/AndroidRuntime(15193): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2210) 11-16 15:06:37.255: E/AndroidRuntime(15193): at android.app.ActivityThread.access$600(ActivityThread.java:142) 11-16 15:06:37.255: E/AndroidRuntime(15193): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1208) 11-16 15:06:37.255: E/AndroidRuntime(15193): at android.os.Handler.dispatchMessage(Handler.java:99) 11-16 15:06:37.255: E/AndroidRuntime(15193): at android.os.Looper.loop(Looper.java:137) 11-16 15:06:37.255: E/AndroidRuntime(15193): at android.app.ActivityThread.main(ActivityThread.java:4931) 11-16 15:06:37.255: E/AndroidRuntime(15193): at java.lang.reflect.Method.invokeNative(Native Method) 11-16 15:06:37.255: E/AndroidRuntime(15193): at java.lang.reflect.Method.invoke(Method.java:511) 11-16 15:06:37.255: E/AndroidRuntime(15193): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791) 11-16 15:06:37.255: E/AndroidRuntime(15193): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558) 11-16 15:06:37.255: E/AndroidRuntime(15193): at dalvik.system.NativeStart.main(Native Method) 11-16 15:06:37.255: E/AndroidRuntime(15193): Caused by: android.os.BadParcelableException: ClassNotFoundException when unmarshalling: com.example.model.engine 11-16 15:06:37.255: E/AndroidRuntime(15193): at android.os.Parcel.readParcelable(Parcel.java:2077) 11-16 15:06:37.255: E/AndroidRuntime(15193): at android.os.Parcel.readValue(Parcel.java:1965) 11-16 15:06:37.255: E/AndroidRuntime(15193): at android.os.Parcel.readMapInternal(Parcel.java:2226) 11-16 15:06:37.255: E/AndroidRuntime(15193): at android.os.Bundle.unparcel(Bundle.java:223) 11-16 15:06:37.255: E/AndroidRuntime(15193): at android.os.Bundle.getString(Bundle.java:1055) 11-16 15:06:37.255: E/AndroidRuntime(15193): at com.example.cars.CarPresenter.getExtraString(CarPresenter.java:34) 11-16 15:06:37.255: E/AndroidRuntime(15193): ... 11 more </code></pre> <p>So it somehow fails to read anything from the Bundle.</p> <p>This can be solved by modifying the readBundle call to:</p> <pre><code> public Car(Parcel parcel) { getPresenter().setBundle(parcel.readBundle(engine.class.getClassLoader())); } </code></pre> <p>However, wouldn't this mean that I could only have one type of parcelables in my bundle? For example, what if another presenter wanted to add another parcelable object to the bundle?</p> <p>Could anyone shed some light on this?</p>
 

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