棒棒糖:让我的活动留在启动分享意图的任务中 [英] Lollipop: making my activity stay in the task that launched the share intent

问题描述

我的第一个应用程序"具有处理共享"意图的活动.它在AndroidManifest.xml中的活动如下:

"My First App" has an activity that handles a "share" intent. Its activity in AndroidManifest.xml looks like this:

    <activity
        android:name="com.example.foo.myfirstapp.MainActivity"
        android:label="@string/app_name">
        <intent-filter>
          <action android:name="android.intent.action.SEND"/>
          <category android:name="android.intent.category.DEFAULT"/>
          <data android:mimeType="image/jpeg"/>
        </intent-filter>

    </activity>

在KitKat中，将相册中的图像共享到我的第一个应用程序"会使MainActivity成为相册任务的一部分.这是所需的行为.

In KitKat, sharing an image from the album to "My First App" causes MainActivity to be part of the album’s task. This is the desired behavior.

在Lollipop中，将相册中的图像共享到我的第一个应用程序"会导致启动我的第一个应用程序"的新实例.如果我查看概述屏幕，那么相册任务就在其中...然后有一个单独的条目用于我的第一个应用程序".如果我共享另一个图像，那么我会看到两个我的第一个应用程序"实例...等.

In Lollipop, sharing an image from the album to "My First App" causes a new instance of "My First App" to be launched. If I look at the overview screen, the album task is there...and then there's a separate entry for "My First App". If I share another image, I wind up with two instances of "My First App"...etc.

问题:如何使棒棒糖以与KitKat相同的方式处理共享意图?

这是我所做的: 我注意到从专辑发送的意图根据操作系统设置了不同的标志. (我是使用getIntent()并查看了mFlags的.)

Here's what I've done: I notice that the intents sent from the Album have different flags set depending on the OS. (I got these using getIntent() and looking at mFlags.)

Kitkat:0x80001(524289):FLAG_GRANT_READ_URI_PERMISSION，FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET

Kitkat: 0x80001 (524289): FLAG_GRANT_READ_URI_PERMISSION, FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET

棒棒糖:0x18080001(403177473):FLAG_GRANT_READ_URI_PERMISSION，FLAG_ACTIVITY_MULTIPLE_TASK，FLAG_ACTIVITY_NEW_DOCUMENT，FLAG_ACTIVITY_NEW_TASK

Lollipop: 0x18080001 (403177473): FLAG_GRANT_READ_URI_PERMISSION, FLAG_ACTIVITY_MULTIPLE_TASK, FLAG_ACTIVITY_NEW_DOCUMENT, FLAG_ACTIVITY_NEW_TASK

通过阅读 http://developer.android.com/reference/android/content/Intent.html ，看来这最后三个标志正在引起此问题.具体地

From reading http://developer.android.com/reference/android/content/Intent.html, it seems that these last three flags are causing the problem. Specifically

与FLAG_ACTIVITY_MULTIPLE_TASK配对时，这两个行为(FLAG_ACTIVITY_NEW_DOCUMENT或FLAG_ACTIVITY_NEW_TASK)都被修改为跳过对匹配任务的搜索并无条件启动新任务.

When paired with FLAG_ACTIVITY_MULTIPLE_TASK both of these behaviors (FLAG_ACTIVITY_NEW_DOCUMENT or FLAG_ACTIVITY_NEW_TASK) are modified to skip the search for a matching task and unconditionally start a new task.

我一直试图通过在AndroidManifest.xml的活动中指定android:launchMode和android:documentLaunchMode来覆盖"这些标志，但没有成功.

I’ve been attempting to "override" these flags by specifying android:launchMode and android:documentLaunchMode in the activity in AndroidManifest.xml without success.

来自 http://developer.android.com/reference/android/R.attr.html#documentLaunchMode ，将documentLaunchMode设置为从不"似乎是有希望的，因为

From http://developer.android.com/reference/android/R.attr.html#documentLaunchMode, using documentLaunchMode "never" seems promising, since

即使Intent包含Intent.FLAG_ACTIVITY_NEW_DOCUMENT，该活动也不会启动到新文档中.这使活动编写者可以最终控制其活动的使用方式. 但这没用.

This activity will not be launched into a new document even if the Intent contains Intent.FLAG_ACTIVITY_NEW_DOCUMENT. This gives the activity writer ultimate control over how their activity is used. but this didn't work.

我也考虑过android:taskAffinity，但是似乎没有办法说请喜欢启动您的任务".

I also considered android:taskAffinity, but there doesn’t seem to be a way to say "please prefer whatever task launched you".

推荐答案

害怕您对此无能为力.它不在您的控制之下.这是相册"应用程序启动其共享"意图的方式的一种变化.如果它不希望您的活动"完成任务，则不能将其强制执行.

Afraid you can't do anything about this. It isn't under your control. This is a change in the way the "Album" app is launching its "share" Intent. If it doesn't want your Activity in its task, you can't force it in there.

如果在共享"活动的多个实例方面遇到问题，则可以将共享"活动声明为launchMode="singleTask"或launchMode="singleInstance"(取决于您的需求.但是，这可能会破坏其他情况.

If you have issues with having multiple instances of your "share" activity, you could declare your "share" activity as launchMode="singleTask" or launchMode="singleInstance" (depending on your needs. This may, however, break other things.

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