如何保持单个活动实例但能够更新视图? [英] How to keep a single activity instance but be able to update the view?

问题描述

在我的情况下，我需要确保该活动一次只运行一次.

In my situation, there is one case in which I need to make sure the activity only runs one at a time.

我发现如果我设置活动的LauchMode，我可以达到单实例目标，但是它不会更新活动的视图.

I found if I set the LauchMode of the activity, I can reach the single instance aim, but it won't update the view of the activity.

此活动由startActivityForResult启动，我们将带有意图的URI发送到该活动.

This activity is launched by startActivityForResult, and we send the URI with the intent to the activity.

让我们讨论这种情况:

• 画廊-使用imageA禁用此活动.

• gallery - lauch this activity with imageA.

相机-使用imageB禁用此活动.

camera - lauch this activity with imageB.

我的要求不是销毁旧活动，而是刚刚收到新意图信息的活动应刷新视图.

My request is not to destroy the old activity, but the activity that just received the new intent infomation should refresh the view.

我找到了一种新方法onNewIntent. 此方法可以在恢复之前刷新意图.我会尝试的.

I found a new method, onNewIntent. This method can refresh the intent before resume. I will try it.

推荐答案

您可以拥有一个具有清单清单属性为SingleInstance的Activity. 重新启动活动后，就会调用onResume.您可以使用新图像更新视图，并使旧的视图无效.

You can have an Activity with a manifest attribute of singleInstance. As soon as the activity is relaunched , onResume gets called. You can update the view with the new image and invalidate the older View.

<activity ..
      android:launchMode= "singleInstance" />

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