共享文件或内容与第三方活动 [英] Sharing files or content with 3rd party activities

问题描述

我有一个简单的问题，但似乎无法在任何地方我看网上找到了答案。

我有活性的，从互联网下载文件，并将它们通过getApplicationContext（）获得一个本地文件夹getFilesDir（）getPath（），它指向：/data/data/com.myapp.android/文件

现在，当用户选择我要显示其内容的文件，并为我做了以下内容：

 文件文件=新的文件（文件路径）;
开放的我们的uri = Uri.fromFile（文件）;

MimeTypeMap哑剧= MimeTypeMap.getSingleton（）;
字符串类型= mime.getMimeTypeFromExtension（fileExtension）;

意向意图=新的意图（Intent.ACTION_VIEW）;
intent.setAction（android.content.Intent.ACTION_VIEW）;
intent.setDataAndType（URI，类型）;

意图int​​entChooser = Intent.createChooser（意向，打开文件）;
startActivity（intentChooser）;
 

在此执行用户psented的打开文件对话框$ P $，他们选择后，画廊的展示活动将出现什么就可以了。

在logcat的样子，我看到以下内容：

  E / PanoMetadata（17732）：无法读取文件：/data/data/com.myapp.android/files/downloads/Splash.png
E / PanoMetadata（17732）：java.io.FileNotFoundException：/data/data/com.myapp.android/files/downloads/Splash.png：打开失败：EACCES（权限被拒绝）
E / PanoMetadata（17732）：在libcore.io.IoBridge.open（IoBridge.java:409）
E / PanoMetadata（17732）：在java.io.FileInputStream中＆LT; INIT＆GT;（FileInputStream.java:78）。
 

请注意在打开失败：EACCES（权限被拒绝）

不过，该文件是真的在那里，我可以用我的活动一个没有问题显示出来。

这个问题似乎是，它开始使用ACTION_VIEW（在这种情况下，图库）的其他活动似乎在不同的进程/用户运行，所以它并没有给我的文件进行读取访问。

我的三个问题是：

1. 是否有可能得到ACTION_VIEW活动中我的过程和用户​​上下文（活动A的）？

运行

2. 我如何活动之间共享文件？ （我不喜欢将文件复制到/ SD卡/ ...但如果​​比它必须是唯一的选择。）

3. 有没有办法从我的活动传递文件的内容（而不是文件指针）图库活动或其他活动？

商祺！

解决方案

  

是否有可能得到ACTION_VIEW活动中我的过程和用户​​上下文（活动A的）？

运行

没有，你也不希望它，出于安全原因。

  

我如何活动之间共享文件？

这个问题是与您的下一个，据我可以告诉。

  

有没有办法从我的活动传递文件的内容（而不是文件指针）图库活动或其他活动？

最好的解决办法是使用的ContentProvider 。最简单的解决方法是使用 FileProvider ，您可以直接添加到您的清单和配置来提供文件，而无需创建一个子类。另请参阅： http://developer.android.com/training/secure-文件共享/ index.html的

I have a simple question but can't seem to find the answer anywhere I look online.

I have an activity A that downloads files from the internet and puts them to a local folder obtained by getApplicationContext().getFilesDir().getPath() which points to: "/data/data/com.myapp.android/files"

Now when the user selects a file I want to show its content and for that I do the following:

File file = new File(filePath);
Uri uri = Uri.fromFile(file);

MimeTypeMap mime = MimeTypeMap.getSingleton();
String type = mime.getMimeTypeFromExtension(fileExtension);

Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setAction(android.content.Intent.ACTION_VIEW);
intent.setDataAndType(uri, type);

Intent intentChooser = Intent.createChooser(intent, "Open File");
startActivity(intentChooser);

When this executes the user is presented with the Open File dialog and after they select "Gallery" the Gallery activity appears with nothing on it.

Looking at logcat I see the following:

E/PanoMetadata(17732): Could not read file: /data/data/com.myapp.android/files/downloads/Splash.png
E/PanoMetadata(17732): java.io.FileNotFoundException: /data/data/com.myapp.android/files/downloads/Splash.png: open failed: EACCES (Permission denied)
E/PanoMetadata(17732):  at libcore.io.IoBridge.open(IoBridge.java:409)
E/PanoMetadata(17732):  at java.io.FileInputStream.<init>(FileInputStream.java:78)

Note the "open failed: EACCES (Permission denied)"

But the file is really there and I can display it using my activity A without a problem.

The problem seems to be that the other activity which starts using ACTION_VIEW (in this case Gallery) seems to run under different process/user so it does not have read access to my file.

My 3 questions are:

1. Is it possible to get the ACTION_VIEW activity to run within my process and user context (of activity A)?

2. How do I share files between activities? (I do not like to copy the file under /sdcard/... but if that is the only option than it will have to be.)

3. Is there a way to pass the file content (not file pointer) from my activity to the Gallery activity or other activities?

Regards!

解决方案

Is it possible to get the ACTION_VIEW activity to run within my process and user context (of activity A)?

No, nor would you want it to, for security reasons.

How do I share files between activities?

This question is the same as your next one, as far as I can tell.

Is there a way to pass the file content (not file pointer) from my activity to the Gallery activity or other activities?

The best solution is to use a ContentProvider. The simplest solution is to use FileProvider, which you can just add to your manifest and configure to serve up your files, without any need to create a subclass. See also: http://developer.android.com/training/secure-file-sharing/index.html

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