我想从一个活动传递一个对象MyItem的ArrayList到另一个。从我理解我需要在MyItem类中实现Parcable。因此,这是i'va迄今所做的:Android - Parcelable | putParcelableArrayListExtra(“ListItems”,listItems);
public class MyItem implements ClusterItem, Parcelable {
private LatLng mPosition=null;
private String aString;
public MyItem(double lat, double lng, String aString) {
mPosition = new LatLng(lat, lng);
this.aString= aString;
}
@Override
public LatLng getPosition() {
return mPosition;
}
public String getString(){
return aString;
}
public int describeContents() {
return 0;
}
public void writeToParcel(Parcel dest, int flags) {
//dest.writeLngLat ?
dest.writeString(postID);
}
public static final Parcelable.Creator<MyItem> CREATOR
= new Parcelable.Creator<MyItem>() {
public MyItem createFromParcel(Parcel in) {
return new MyItem(in);
}
public MyItem[] newArray(int size) {
return new MyItem[size];
}
};
private MyItem(Parcel in) {
//mPosition = in.readLngLat ?
aString = in.readString();
}
}
第一个问题:我怎么能写LngLat领域writeToParcel,我怎么能decleare它MyItem(包裹中)构造函数?
第二个问题:这是否足以让这段代码可以工作?
ArrayList<MyItem> listItems = new ArrayList<>();
Iterator<MyItem> items = cluster.getItems().iterator();
while (items.hasNext()) {
listItems.add(items.next());
}
Intent intent = new Intent(MapsActivity.this, ClusterPosts.class);
intent.putParcelableArrayListExtra("oO", listItems);
startActivity(intent);
,然后在CluserPosts:
Intent intent = getIntent();
ArrayList<MyItem> post = intent.getParcelableArrayListExtra("oO");
for(MyItem item : post){
Log.d("elaela", item.getString());
}
'LatLng'是'Parcelable',对不对? – pskink
LatLng是Google Maps API的“默认”对象,未由我实施。但是我认为它实际上可以是 –
,所以它是'Parcelable',然后直接从/到'Parcel'读/写它 – pskink