How to pass an array of Address objects to an other Acitvity

问题

I'm trying to pass an array of Address objects to another Activity through an Intent object.

As the Address class implements the Parcelable interface I try to do the following. I got a List Address object from a Geocoder object, which I convert into a array of Address objects. Then I put this array into the Intent and call the activity.

final Address[] addresses = addresseList.toArray(new Address[addresseList.size()]);

final Intent intent = new Intent(this, SelectAddress.class);
intent.putExtra(SelectAddress.INTENT_EXTRA_ADDRESSES, startAddresses);

startActivityForResult(intent, REQUEST_CODE_ACTIVITY_SELECT_ADDRESSES);

On the other activity I try to retrieve the Address[] from the Intent with the following piece of code. But the call of the last line ends with a ClassCastException Landroid.os.Parcelable.

Bundle bundle = getIntent().getExtras();            
Address[] addresses = (Address[]) bundle.getParcelableArray(INTENT_EXTRA_ADDRESSES);

What am I doing wrong? How do I have to retrieve the Address[].

回答1:

The problem is the casting. try:

Bundle bundle = getIntent().getExtras();
Parcelable[] parcels = bundle.getParcelableArray(INTENT_EXTRA_ADDRESSES);

Address[] addresses = new Address[parcels.length];
for (Parcelable par : parcels){
     addresses.add((Address) par);              
}

回答2:

or on java1.6:
    Parcelable[] x = bundle.getParcelableArray(KEY);
    addresses = Arrays.copyOf(x, x.length, Address[].class);

回答3:

The @LiorZ answer is completely true. I just merged his answer and this other in this handy function.

@SuppressWarnings("unchecked")
private static <T extends Parcelable> T[] castParcelableArray(Class<T> clazz, Parcelable[] parcelableArray) {
    final int length = parcelableArray.length;
    final T[] array = (T[]) Array.newInstance(clazz, length);
    for (int i = 0; i < length; i++) {
        array[i] = (T) parcelableArray[i];
    }
    return array;
}

来源：https://stackoverflow.com/questions/3647432/how-to-pass-an-array-of-address-objects-to-an-other-acitvity

标签

android

android-activity

android-intent

parcelable