I have an ArrayList of type GeoPoint.
private List<GeoPoint> points = new ArrayList<GeoPoint>();
I want to pass points
to another Activity and retrive the data in that activity. How do I do it? I know I have to use the parcelable
but I searched, but could not find a way to pass ArrayLists.
This function will help you: http://developer.android.com/reference/android/content/Intent.html#putParcelableArrayListExtra(java.lang.String, java.util.ArrayList<? extends android.os.Parcelable>)
But the problem is, that GeoPoint is not Parcelable. Well, you can do a workaround here:
1) Create a class, that implements Parcelable:
public class ParcelableGeoPoint implements Parcelable { private GeoPoint geoPoint; public ParcelableGeoPoint(GeoPoint point) { geoPoint = point; } public GeoPoint getGeoPoint() { return geoPoint; } public int describeContents() { return 0; } public void writeToParcel(Parcel out, int flags) { out.writeInt(geoPoint.getLatitudeE6()); out.writeInt(geoPoint.getLongitudeE6()); } public static final Parcelable.Creator<ParcelableGeoPoint> CREATOR = new Parcelable.Creator<ParcelableGeoPoint>() { public ParcelableGeoPoint createFromParcel(Parcel in) { return new ParcelableGeoPoint(in); } public ParcelableGeoPoint[] newArray(int size) { return new ParcelableGeoPoint[size]; } }; private ParcelableGeoPoint(Parcel in) { int lat = in.readInt(); int lon = in.readInt(); geoPoint = new GeoPoint(lat, lon); } }
2) when sending to the other activity (points is your List<GeoPoint>:
ArrayList<ParcelableGeoPoint> pointsExtra = new ArrayList<ParcelableGeoPoint>(); foreach(GeoPoint point: points) { pointsExtra.add(new ParcelableGeoPoint(point)); } intent.putExtra("geopoints", pointsExtra);
3) in the called activity:
ArrayList<ParcelableGeoPoint> pointsExtra = getIntent().getParcelableArrayListExtra("geopoints"); ArrayList<GeoPoint> points = new ArrayList<GeoPoint>(); foreach(ParcelableGeoPoint point: pointsExtra) { points.add(point.getGeoPoint()); }
code should work, but is untested.
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