Question

我的活动中有一份清单,需要把清单交给下一次活动。

private List<Item> selectedData;

I tried putting this in intent by :

intent.putExtra("selectedData", selectedData);

但它没有发挥作用。可做些什么?

Answer 1

您必须首先将<代码>List具体类型。 <代码>List本身是一个接口。

If you implement the Parcelable interface in your object then you can use the putParcelableArrayListExtra() method to add it to the Intent.

Answer 2

和评论中提到的排他性一样,如果你把标语列入你的序列,那就变得非常容易。然后,你可以把它放到你可以带去的布局。例如:

class ExampleClass implements Serializable {
    public String toString() {
        return "I am a class";
    }
}

... */ Where you wanna create the activity /*

ExampleClass e = new ExampleClass();
ArrayList<ExampleClass> l = new ArrayList<>();
l.add(e);
Intent i = new Intent();
Bundle b = new Bundle();
b.putSerializeable(l);
i.putExtra("LIST", b);
startActivity(i);

Answer 3

i think ur item should be parcelable. and you should use arraylist instead of list. then use intent.putParcelableArrayListExtra

Answer 4

这是我的工作。

//first create the list to put objects
private ArrayList<ItemCreate> itemsList = new ArrayList<>();

//on the sender activity
     //add items to list where necessary also make sure the Class model ItemCreate implements Serializable
     itemsList.add(theInstanceOfItemCreates);

        Intent goToActivity = new Intent(MainActivity.this, SecondActivity.class);
                        goToActivity.putExtra("ITEMS", itemsList);
                        startActivity(goToActivity);

    //then on second activity
    Intent i = getIntent();
            receivedItemsList = (ArrayList<ItemCreate>) i.getSerializableExtra("ITEMS");
            Log.d("Print Items Count", receivedItemsList.size()+"");
            for (Received item:
                 receivedItemList) {
                Log.d("Print Item name: ", item.getName() + "");
        }

我希望它也为你工作。

Answer 5

每个人都说,你可以使用可乘飞机,但无人提到,你只能把价值投向可乘飞机,而不是列入名单。

intent.putExtra("selectedData", (Serializable) selectedData);

Core s lists implementations already implement Serializable, so you re not bound to a specific implementation of list, but remember that you still can catch ClassCastException.

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