如何传递 ArrayList<Custom_Object>在 Android 中从一项活动到另一项活动? [英] How to pass ArrayList&lt;Custom_Object&gt; from one activity to another in Android?

问题描述

我正在尝试将自定义对象从一个活动发送到另一个活动，但是当我调用开始活动时它崩溃了.

I am trying to send a custom object from one activity to another activity, but it's crashing when I call the start activity.

以下是我使用的片段.

我的活动实现了Serializable

ArrayList<CUSTOM_OBJECT> Cus_Obje_arraylist = new ArrayList<CUSTOM_OBJECT>();

这是我的意图:

Intent inte = new Intent(getApplicationContext(), ListActivity.class); `
inte.putExtra("list",Cus_Obje_arraylist);`
startActivity(inte);

请告诉我它为什么会崩溃或者我可以使用什么替代方法?

Please let me know why it's crashing or what alternate way I can use?

推荐答案

我可以给个建议.我在我的项目中这样做.

I can give a suggestion. I do this in my project.

1.实现一个单例类作为传递对象的桥梁.(希望你知道什么是单身，我你不知道，添加评论告诉我.

1.Implement a singleton class as the bridge to pass object. (Hopefully you know what's singleton, I you don't, add comment to tell me.

class BridgeClass {
    private BridgeClass() {}

    static BridgeClass obj = nil;
    public BridgeClass instance() {
         if (obj == nil) obj = new BridgeClass();
         return obj;
    }

    public ArrayList<CUSTOM_OBJECT> cache;
 }

2.在 from 活动中，

2.In the from activity,

BridgeClass.instance().cache = Cus_Obje_arraylist;

3.然后在to活动中，可以从bridge类中获取.

3.Then in the to activity, you can get it from the bridge class.

ArrayList<CUSTOM_OBJECT> Cus_Obje_arraylist = BridgeClass.instance().cache;

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