使用 startActivityForResult，如何在子活动中获取 requestCode?

问题描述

我有四项活动，比如 A、B、C 和 D.我的情况是 A 将通过 startActivityForResult 启动活动 B.

I have four activities, say A, B, C and D.My situation is A will start the activity B by startActivityForResult.

startActivityForResult(new Intent(this,B.class),ONE);

在其他情况下，我会在其他情况下 B.喜欢

In other situation i will B with other situation. like

 startActivityForResult(new Intent(this,B.class),TWO);

在 B 中，我需要根据 requestCode 调用 C 或 D.即如果一个需要启动 C 否则 D.
所以我需要知道如何检查子活动中的 requestCode(此处为 B).
换句话说，我想获取启动 Activity B 的请求代码.

In B, I need to call C or D depending on requestCode. I.e if ONE need to start C else D.
So I need to know how to check the requestCode in the child Activity (B here).
In other words, I want to get the request code that Activity B was started with.

推荐答案

可以通过 put extra 传递请求代码.

You can pass request code by put extra.

intent.putExtra("requestCode", requestCode);

或者，如果您多次使用 startActivityForResult，那么比编辑每个都更好，您可以在 Activity 中override startActivityForResult，像这样在那里添加你的代码

Or if you have used startActivityForResult many times, then better than editing each, you can override the startActivityForResult in your Activity, add you code there like this

@Override
    public void startActivityForResult(Intent intent, int requestCode) {
        intent.putExtra("requestCode", requestCode);
        super.startActivityForResult(intent, requestCode);
    }

所以没有必要编辑你所有的 startActivityForResult
希望对你有帮助

So there is no need to edit all your startActivityForResult
Hope it helped you

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