It is illegal in Java to cast an array of a supertype into an array of
a subtype.
On Thu, Jul 2, 2009 at 11:42 PM, ade<a.wirayu...@gmail.com> wrote:
>
> Hello Android Developers,
>
> Why do I get java.lang.ClassCastException when I tried to cast back
> an array of custom object that implements Parcelable?
>
> Here is the custom class:
>
> public class Placemark implements Parcelable {
> public Double latitude;
> public Double longitude;
> public Double distanceFromUser;
> public int accuracy;
> public String address;
> private static final int earthRadius = 6371;
>
> public static final Parcelable.Creator<Placemark> CREATOR = new
> Parcelable.Creator<Placemark>() {
> public Placemark createFromParcel(Parcel in) {
> return new Placemark(in);
> }
>
> public Placemark[] newArray(int size) {
> return new Placemark[size];
> }
> };
>
> public Placemark(JSONObject jo) throws JSONException {
> this.address = jo.getString("address");
> JSONArray array = jo.getJSONObject("Point").getJSONArray(
> "coordinates");
> this.latitude = array.getDouble(1);
> this.longitude = array.getDouble(0);
> this.accuracy = array.getInt(2);
> }
>
> public Placemark(JSONObject jo, Location userLocation)
> throws JSONException {
> this.address = jo.getString("address");
> JSONArray array = jo.getJSONObject("Point").getJSONArray(
> "coordinates");
> this.latitude = array.getDouble(1);
> this.longitude = array.getDouble(0);
> this.accuracy = array.getInt(2);
>
> // based on Haversine formula
> // (http://www.movable-type.co.uk/scripts/latlong.html)
> Double dLat = Math.toRadians(userLocation.getLatitude()
> - this.latitude);
> Double dLon = Math.toRadians(userLocation.getLongitude()
> - this.longitude);
> Double a = Math.sin(dLat / 2) * Math.sin(dLat / 2)
> + Math.cos(Math.toRadians(this.latitude))
> *
> Math.cos(Math.toRadians(userLocation.getLatitude()))
> * Math.sin(dLon / 2) * Math.sin(dLon / 2);
> Double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
> this.distanceFromUser = earthRadius * c;
> }
>
> public Placemark(Parcel in) {
> readFromParcel(in);
> }
>
> �...@override
> public String toString() {
> return this.address
> + (this.distanceFromUser != null ? " ("
> +
> Math.rint(this.distanceFromUser) + " km)" : "");
> }
>
> public int describeContents() {
> // TODO Auto-generated method stub
> return 0;
> }
>
> public void writeToParcel(Parcel dest, int flags) {
> dest.writeDouble(latitude);
> dest.writeDouble(longitude);
> dest.writeInt(accuracy);
> dest.writeString(address);
> }
>
> public void readFromParcel(Parcel in) {
> latitude = in.readDouble();
> longitude = in.readDouble();
> accuracy = in.readInt();
> address = in.readString();
> }
> }
>
> ------------------------------------------------------------------------------
> and here's the code that throws the error:
>
> Bundle lastSearchBundle = extras.getBundle("lastSearch");
> mSearchResult= (Placemark[]) lastSearchBundle.getParcelableArray
> ("searchResult"); //-->this is the line that throws the error
>
> ------------------------------------------------------------------------------
> and here's the error detail:
>
> E/AndroidRuntime( 9449): java.lang.RuntimeException: Unable to start
> activity ComponentInfo{com.xxx/com.xxx.Search}:
> java.lang.ClassCastException: [Landroid.os.Parcelable;
> E/AndroidRuntime( 9449): at
> android.app.ActivityThread.performLaunchActivity(ActivityThread.java:
> 2268)
> E/AndroidRuntime( 9449): at
> android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:
> 2284)
> E/AndroidRuntime( 9449): at android.app.ActivityThread.access$1800
> (ActivityThread.java:112)
> E/AndroidRuntime( 9449): at android.app.ActivityThread$H.handleMessage
> (ActivityThread.java:1692)
> E/AndroidRuntime( 9449): at android.os.Handler.dispatchMessage
> (Handler.java:99)
> E/AndroidRuntime( 9449): at android.os.Looper.loop(Looper.java:123)
> E/AndroidRuntime( 9449): at android.app.ActivityThread.main
> (ActivityThread.java:3948)
> E/AndroidRuntime( 9449): at java.lang.reflect.Method.invokeNative
> (Native Method)
> E/AndroidRuntime( 9449): at java.lang.reflect.Method.invoke
> (Method.java:521)
> E/AndroidRuntime( 9449): at com.android.internal.os.ZygoteInit
> $MethodAndArgsCaller.run(ZygoteInit.java:782)
> E/AndroidRuntime( 9449): at com.android.internal.os.ZygoteInit.main
> (ZygoteInit.java:540)
> E/AndroidRuntime( 9449): at dalvik.system.NativeStart.main(Native
> Method)
> E/AndroidRuntime( 9449): Caused by: java.lang.ClassCastException:
> [Landroid.os.Parcelable;
> E/AndroidRuntime( 9449): at com.xxx.Search.onCreate(Search.java:96)
> E/AndroidRuntime( 9449): at
> android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:
> 1127)
> E/AndroidRuntime( 9449): at
> android.app.ActivityThread.performLaunchActivity(ActivityThread.java:
> 2231)
> E/AndroidRuntime( 9449): ... 11 more
>
> ---------------------------------------------------------------------
> Can somebody point my mistake? Thank you.
> >
>
--
Romain Guy
Android framework engineer
romain...@android.com
Note: please don't send private questions to me, as I don't have time
to provide private support. All such questions should be posted on
public forums, where I and others can see and answer them
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