Question

我试图将一些数据从意图传递给onActivityResult（）方法，这就是我所做的：

Item 0
process is called
process is called
Item 1
process is called
Item 2
process is called
Item 3
process is called...

Desired output:
Item 0
process is called
process is called
process is called
process is called
process is called
process is called
Item 1

然后：

Intent intent = new Intent();
intent.putExtra("STRING", some_data);
startActivityForResult(intent, 1);

但是这给了我一个NullPointerException（data == null），我不明白，我错过了什么吗？

Answer 1

我们假设您使用Activity

从Activity A开始startActivityForResult(intent, 1); B

您在此意图中传递的数据可在Activity B

中找到

如果您想将某些数据从Activity B传回Activity A，则必须在调用活动B中的setResult()之前致电finish()。如下所示：

        Intent intent = new Intent();
        intent.putExtra("STRING", some_data);
        setResult(Activity.RESULT_OK, intent);
        finish();

有关详细信息，请参阅here。

Answer 2

你可以打电话

setResult(int resultCode, Intent data)

在第二次活动的call finish（）方法之前。

https://developer.android.com/reference/android/app/Activity.html#setResult(int, android.content.Intent)

如何将意图中的额外内容传递给onActivityResult（）方法？

2 个答案: