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The first step is to override the writeToParcel() method and write all object members into parcel objects. If a developer wants to convert a Java object into Parcelable, then the best way to do so is by implementing the Parcelable interface and overriding the writeToParcel() methods in its own class. Here’s why:Īndroid Parcelable implementation allows objects to read and write from Parcels which can contain flattened data inside message containers.
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The fact that Parcelable is faster than Serialization makes it a preferred choice of approach while passing an object. Developers can opt from the two types of object passing techniques, i.e.
#JAVA REFLECTION TO SERIALIZE ANDROID#
Serialization, on the other hand, is a Java interface that allows users to implement the interface which gets marked as Serializable.ĭuring the Android application development process, developers often have to send Java class objects from one activity to another activity using the intent. If a user wants to send Java objects through intent, Java class should be implemented using the Parcelable interface. All you have to do is put the data with unique key in intents and send it to another activity. through intents is quite easy in Android. Passing primitive data types like string, integer, float, etc. This blog is my attempt to compare the two techniques and cite an example to help decide which one of these is the best approach for passing an object from one activity to another.
#JAVA REFLECTION TO SERIALIZE HOW TO#
In this article, we’ve learned why and how to use Parcelable or Serializable objects in case of sending data between Android components.Android developers often face a predicament while passing object references to activities of whether to go with the Java Serialization method or opt for Android Parcelable. As such, it is not appropriate to place any Parcel data in to persistent storage: changes in the underlying implementation of any of the data in the Parcel can render older data unreadable. This class (and the corresponding Parcelable API for placing arbitrary objects into a Parcel) is designed as a high-performance IPC transport. Parcel is not a general-purpose serialization mechanism. Note this extract from the documentation: But keep in mind that if you want to save an object in a file or save the state of your game into a file on the storage you still must use Serializable instead of Parcelable. On the other side, Parcelable is faster and more optimized than Serialization because it’s the developer’s responsibility to build the parcel object, so there is no need to use reflection. But in Serializable, reflection is used and through the process, many temporary objects will be created. Now that we know how to create Parcelable and Serializable objects, in case of transferring objects between Android components which one is a better choice? As we learned, in comparison with Serializable, making a Parcelable object requires a lot of boilerplate code, especially for java developers. Isn’t it cool? it’s just one reason why we must use Kotlin instead of Java :D Conclusion
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And by returning back the user to the app, the OS creates a new process for the application. “In case of transferring objects between Android components, why do we have to convert them to the Serializable or Parcelable?” When an application is in the background, its process may be killed by the OS in case of low memory. Before comparing Java Serializable and Android Pacelable together, let’s find the answer to this question.