java - 不能在 Intent 上附加额外的内容

Question

我正在尝试将一个对象作为 extra 放在一个 intent 上。该对象的类是我创建的，所以我将其设为 Parcelable。

public class NavigationDataSet implements Parcelable {

    private ArrayList<Placemark> placemarks = new ArrayList<Placemark>();
    private Placemark currentPlacemark;
    private Placemark routePlacemark;

    @Override
    public int describeContents() {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public void writeToParcel(Parcel out, int flags) {
        // TODO Auto-generated method stub
        out.writeList(placemarks);
        out.writeValue(currentPlacemark);
        out.writeValue(routePlacemark);
    }

    // this is used to regenerate your object. All Parcelables must have a CREATOR that implements these two methods
    public static final Parcelable.Creator<NavigationDataSet> CREATOR = new Parcelable.Creator<NavigationDataSet>() {
        public NavigationDataSet createFromParcel(Parcel in) {
            return new NavigationDataSet(in);
        }

        public NavigationDataSet[] newArray(int size) {
            return new NavigationDataSet[size];
        }
    };

    // example constructor that takes a Parcel and gives you an object populated with it's values
    private NavigationDataSet(Parcel in) {
        in.readTypedList(placemarks, Placemark.CREATOR);
        this.currentPlacemark = in.readParcelable((ClassLoader) Placemark.CREATOR);
        this.routePlacemark = in.readParcelable(Placemark.class.getClassLoader());
    }
}

在 Activity 中，我这样声明变量:

private List<NavigationDataSet> ds;

以及 Intent 创建:

public static Intent mapIntent(Context context){
        Intent i = new Intent(context, mapsView.class);
        i.putExtra("NavSet", ds);
        return i;
}

变量 ds 在 onCreate 方法上执行的 AsyncTask 上初始化。 我在 putExtra 指令上遇到预编译错误:

Cannot make a static reference to the non-static field ds

但是在这里http://developer.android.com/reference/android/content/Intent.html它并没有说它必须是静态变量。

如果我将其更改为静态，它会显示:

The method putExtra(String, boolean) in the type Intent is not applicable for the arguments (String, List)

但我没有传递一个 boolean 值，它是一个 Parcelable!!!那我该怎么办？我真的不明白这是怎么回事。

Answer 1

ArrayList<ParcelableObject> pointsExtra = new ArrayList<ParcelableObject>();
intent.putExtra("", pointsExtra);

http://developer.android.com/reference/android/content/Intent.html#putParcelableArrayListExtra%28java.lang.String