How to make generic arraylist parcelable in Android?

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I have such a Class: (full definition can be found here)

public class AList<T> {
    private ArrayList<T> list = new ArrayList<>();
}

It is a C#-like generic list.

How should I implement AList as a Parcelable? I have found examples online but their data types are determined. How should I deal with generic types?

This is my current try:

@Override
public int describeContents() {
    return 0;
}

@Override
public void writeToParcel(Parcel dest, int flags) {
    dest.writeList(list);
}

protected AList(Parcel in) {
    list = in.readArrayList(null);
}

public static final Creator<AList> CREATOR = new Creator<AList>() {
    @Override
    public AList createFromParcel(Parcel in) {
        return new AList(in);
    }

    @Override
    public AList[] newArray(int size) {
        return new AList[size];
    }
};

but the constructor would give me BadParcelableException.

I have also tried this:

protected AList(Parcel in) {
    in.readList(list, T.class.getClassLoader());
}

but T cannot be used as a variable so I don't know how to fix this syntax.

In order for your List to be parcelable, each element of that List should implement Parcelable. So basically you would define your List as ArrayList<Parcelable> list = new ArrayList<>()

SomeClass implements Parcelable {
...
}

A couple of tests:

list.add("test"); // error, String doesn't implement Parcelable
list.add(new SomeClass()); // fine
list.add(new android.location.Address(Locale.getDefault())); // fine

This is commonly used to attach data to Intents, example:

Intent i = new Intent(this, SomeActivity.class)
i.putParcelableArrayListExtra("key", list);

Android example - Parcel.java, Android example source code file: Parcel.java (arraylist, n, parcel, parcelable, These methods * do not write the class information of the original object: instead, Flatten a generic SparseArray into the parcel at the current * dataPosition(),� Creating a Parcelable class is a vital skill for Android Developers because it allows you to pass an object from one Activity to another. This series will walk you through step by step in the

I have given up implementing AList as a Parcelable. However, since AList is ArrayList-like, I can treat it exactly as an ArrayList when I need to write AList<T> to Parcel.

For example, I have a AList<Tag> Tags declared in Food class. So in protected Food(Parcel in), I can write:

    ArrayList<Tag> tags = new ArrayList<>();
    in.readTypedList(tags, Tag.CREATOR);
    Tags = new AList<>(tags);

Of course, I have implemented Tag as a Parcelable. And I can have such writeToParcel:

@Override
public void writeToParcel(Parcel dest, int flags) {
    dest.writeString(Name);
    dest.writeString(ImagePath);
    dest.writeTypedList(Tags.ToArrayList());
    dest.writeString(Note);
    dest.writeByte((byte) (IsFavorite ? 1 : 0));
    if (DateAdded == null) {
        dest.writeByte((byte) 0);
    } else {
        dest.writeByte((byte) 1);
        dest.writeLong(DateAdded);
    }
}

My source code for Food class is here.

Parcelable, Classes implementing the Parcelable interface must also have a non-null static field called CREATOR of a type that implements the Parcelable. android,dynamic,android-arrayadapter,android-spinner @Haresh Chhelana example is good, However if you want to show both name and code in spinner after selecting, check this out.

public class  Sample<T> implements Parcelable {
ArrayList<T> list;

@Override
public int describeContents() {
    return 0;
}

@Override
public void writeToParcel(Parcel dest, int flags) {
    dest.writeList(this.list);
}

public Sample() {
}

protected Sample(Parcel in) {
    this.list = new ArrayList<T>();
    in.readList(this.list, T.class.getClassLoader());
}

public static final Parcelable.Creator<Sample> CREATOR = new Parcelable.Creator<Sample>() {
    @Override
    public Sample createFromParcel(Parcel source) {
        return new Sample(source);
    }

    @Override
    public Sample[] newArray(int size) {
        return new Sample[size];
    }
};

}

Parcel, This class (and the corresponding Parcelable API for placing arbitrary objects into a Parcel) is ClassLoader) methods which define the types of objects allowed. Read and return a new ArrayList object from the parcel at the current dataPosition(). Unit Write a generic serializable object in to a Parcel. First, your Product object must implements Parcelable. And then, use dest.writeTypedList(products) in writeToParcel() method. Finally, use following code to parse the list: products = new ArrayList<Product>(); in.readTypedList(products, Product.CREATOR); For more infomation, please reference the Official Document:

android.os.Parcel.writeTypedList java code examples, This class (and the corresponding Parcelable API for placing arbitrary objects into a Parcel) is ClassLoader) methods which define the types of objects allowed. Read and return a new ArrayList object from the parcel at the current dataPosition(). Write a generic serializable object in to a Parcel. I have seen many parcelable examples so far, but for some reason I can't get it to work when it gets a bit more complex. I have a Movie object, which implements Parcelable. This book object contains some properties, such as ArrayLists. Running my app results in a NullPointerException when executing the ReadTypedList ! I'm really out of ideas here

how to properly implement Parcelable with an ArrayList<Parcelable>?, public void writeToParcel(Parcel dest, int flags) { dest. android.os. writeTypedList(mObjList); } private ClassABC(Parcel in) { mObjList = new ArrayList<ClassABC>(); in. rehydrated.size()); assertEquals(23, rehydrated.get( 0).contents); } Unlike the generic writeList() method, however, only the raw data of the objects is� A Parcelable is the Android implementation of the Java Serializable. It assumes a certain structure and way of processing it. This way a Parcelable can be processed relatively fast, compared to the standard Java serialization.

A study of the Parcelize feature from Kotlin Android Extensions, how to pass arraylist using parcelable in android android parcelable list of custom objects android. I am having trouble making my class Parcelable . The idea of a parcelable object Android is similar to Serialization in core Java. The differences are the parcelable is more optimized to pass data between activties or fragments in Android, so it is much faster than serialization. A parcelable object does the marshaling and unmarshaling of the data to avoid creating garbage objects.

Comments
  • T.class.getClassLoader() will not compile as explained in the question.