[英]Android: Object.list is empty after passing it as parcelable
我是java / android的新手。 我試圖將實現Parcelable的自定義對象(Raffle)傳遞給另一個活動。
在接收活動中,我可以訪問該對象的字符串屬性,但是列表有時會被清空。 在第一個活動中烘烤list.size()會得到3,但在接收活動中相同的祝酒會得到0。
相關代碼如下。 如果我遺漏了任何東西,請告訴我。
發送活動(HomeActivity)中的onCLickListener
raffleListView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> a, View v, int position, long id) {
Intent intent = new Intent(HomeActivity.this,RafflePurchaseActivity.class);
Raffle selectedRaffle = (Raffle) allRaffles.get(position);
Toast.makeText(getApplicationContext(), "1: " + selectedRaffle.Description + ": " + Integer.toString(selectedRaffle.getTicketTiers().size()), Toast.LENGTH_SHORT).show();
//Toast.makeText(getApplicationContext(), "TEST: " + Integer.toString(selectedRaffle.ticketTiers.size()), Toast.LENGTH_SHORT).show();
intent.putExtra("raffle", selectedRaffle);
startActivity(intent);
}
});
接收活動(RafflePurchaseActivity)
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_raffle_purchase);
Bundle bundle = this.getIntent().getExtras();
Raffle theRaffle = bundle.getParcelable("raffle");
List<RaffleTicketTier> xticketTiers = theRaffle.getTicketTiers();
Toast.makeText(getApplicationContext(), "2:" + theRaffle.Description + ": " + Integer.toString(xticketTiers.size()), Toast.LENGTH_SHORT).show();
}
抽獎班
public class Raffle implements Parcelable {
public String Title;
public String Description;
public int TicketLimit;
public int numPrizes;
public String prize1;
public String prize2;
public String prize3;
public String prize4;
private List<RaffleTicketTier> ticketTiers = new ArrayList<RaffleTicketTier>();
public Raffle() {
Title = "Art Union";
Description = "THIS IS A RAFFLE DESCRIPTION";
ticketTiers.add(new RaffleTicketTier(1,10.00));
ticketTiers.add(new RaffleTicketTier(3,20.00));
ticketTiers.add(new RaffleTicketTier(8,50.00));
ticketTiers.add(new RaffleTicketTier(15,100.00));
testList.add("Test1");
testList.add("Test2");
testList.add("Test3");
}
//================================================================================
// Getters/Setters
//================================================================================
public List<RaffleTicketTier> getTicketTiers() {
return ticketTiers;
}
//================================================================================
// Parcelable methods
//================================================================================
//Constructor to use when re-constructing object from a parcel
public Raffle(Parcel in) {
readFromParcel(in);
}
@Override
public int describeContents() {
// TODO Auto-generated method stub
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(Title);
dest.writeString(Description);
dest.writeInt(TicketLimit);
dest.writeInt(numPrizes);
dest.writeString(prize1);
dest.writeString(prize2);
dest.writeString(prize3);
dest.writeString(prize4);
}
private void readFromParcel(Parcel in) {
Title= in.readString();
Description= in.readString();
TicketLimit= in.readInt();
numPrizes= in.readInt();
prize1= in.readString();
prize2= in.readString();
prize3= in.readString();
prize4= in.readString();
}
public static final Parcelable.Creator<Raffle> CREATOR = new Parcelable.Creator<Raffle>() {
public Raffle createFromParcel(Parcel in) {
return new Raffle(in);
}
public Raffle[] newArray(int size) {
return new Raffle[size];
}
};
}
您似乎並沒有在包裹中寫tickerTiers
。 像這樣的答案https://stackoverflow.com/a/10781119/156708用於打包自定義類型的數組。
其他答案的相關代碼
public void writeToParcel(Parcel out, int arg1) {
out.writeInt(mObjList.length);
out.writeTypedArray(mObjList, arg1);
}
private void readFromParcel(Parcel in) {
int size = in.readInt();
mObjList = in.readTypedArray(new MyClass[size], MyClass.CREATOR);
}
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