写作parcelables的阵列来一个包裹在Android中 [英] Writing arrays of Parcelables to a Parcel in Android

问题描述

我想写实现 Parcelable 成<一个对象的数组HREF =htt​​p://developer.android.com/reference/android/os/Parcel.html>包裹使用<一个href="http://developer.android.com/reference/android/os/Parcel.html#writeParcelableArray%28T%5B%5D,%20int%29">writeParcelableArray.

我想写的对象定义（如你所期望）为：

The objects I'm trying to write are defined (as you'd expect) as:

public class Arrival implements Parcelable {
    /* All the right stuff in here... this class compiles and acts fine. */
}

和我想他们写成'包裹'有：

And I'm trying to write them into a `Parcel' with:

@Override
public void writeToParcel(Parcel dest, int flags) {
    Arrival[] a;
    /* some stuff to populate "a" */
    dest.writeParcelableArray(a, 0);
}

在Eclipse中尝试编译这个我得到的错误：

When Eclipse tries to compile this I get the error:

约束不匹配：通用方法   类型writeParcelableArray（T []，INT）   包裹是不适用于   参数（港[]，INT）。该   推断的类型到达不是有效   代替界参数   ＆LT;牛逼扩展Parcelable>

Bound mismatch: The generic method writeParcelableArray(T[], int) of type Parcel is not applicable for the arguments (Arrival[], int). The inferred type Arrival is not a valid substitute for the bounded parameter < T extends Parcelable >

我完全不明白此错误消息。 Parcelable 是一个接口（而不是类），所以你不能扩展它。任何人有什么想法？

I completely don't understand this error message. Parcelable is an interface (not a class) so you can't extend it. Anyone have any ideas?

更新：我把一个的ArrayList Parcelable s转换为意图：

UPDATE: I'm having basically the same problem when putting an ArrayList of Parcelables into an Intent:

Intent i = new Intent();
i.putParcelableArrayListExtra("locations", (ArrayList<Location>) locations);

收益率：

该方法putParcelableArrayListExtra（字符串，ArrayList的＆LT;延伸Parcelable>）的类型意图是不适用的参数（字符串，ArrayList的＆LT;位置>）

The method putParcelableArrayListExtra(String, ArrayList< ? extends Parcelable >) in the type Intent is not applicable for the arguments (String, ArrayList< Location >)

这可能是因为位置是我的工作上面（封装了抵达 S）类，但我不这么认为。

This may be because Location was the class I was working on above (that wraps the Arrivals), but I don't think so.

推荐答案

事实证明，它只是想让我打造parcelables的数组。要使用示例的问题：

It turns out it just wanted me to build an array of Parcelables. To use the example from the question:

@Override
public void writeToParcel(Parcel dest, int flags) {
    Parcelable[] a;
    /* 
        some stuff to populate "a" with Arrival 
        objects (which implements Parcelable) 
    */
    dest.writeParcelableArray(a, 0);
}

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