[英]Opening pdf with other app from assets folder, workarounds
In my app, I've got some pdf's stored in my assets folder. 在我的应用中,我的资产文件夹中存储了一些pdf文件。 I've seen libraries for opening pdf-pages, but I think that apps such as quickoffice are better at showing the pdf's than the libraries I've seen.
我见过用于打开pdf页面的库,但我认为Quickoffice之类的应用程序比我见过的库更能显示pdf。 Therefore, i wish to show the pdf using
Intent.ACTION_VIEW
, like this: 因此,我希望使用
Intent.ACTION_VIEW
显示pdf,如下所示:
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(fileUri, "application/pdf");
getActivity().startActivity(intent);
However, this is not possible because third party apps are not allowed to acces files in my package. 但是,这是不可能的,因为不允许第三方应用访问我程序包中的文件。 Therefore I need to copy the files to the external storage and provide that file to the intent.
因此,我需要将文件复制到外部存储中,然后将其提供给意图。
That brings my to my question: my pdf's are quite big in size, so I think it'd be stupid to store them twice (once in my assets folder and once on the external storage). 这使我想到了一个问题:我的pdf很大,因此我认为将它们存储两次(一次在我的Assets文件夹中,一次在外部存储器中)是愚蠢的。 So I'm wondering if there is a work-around for this.
所以我想知道是否有解决方法。 Could i for example do:
我可以例如这样做:
//Copy file to external storage
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(fileUri, "application/pdf");
getActivity().startActivity(intent);
//Delete file from external storage
Is this a good work-around or will this cause problems with the pdf-viewing app? 这是一个好的解决方法,还是会导致pdf查看应用出现问题? Or is there a different work-around?
还是有其他解决方法?
Therefore I need to copy the files to the external storage and provide that file to the intent.
因此,我需要将文件复制到外部存储中,然后将其提供给意图。
You can also try my StreamProvider
, a canned ContentProvider
, based on Google's FileProvider
, that streams from assets. 您还可以尝试我的
StreamProvider
,它是基于Google的FileProvider
的罐装ContentProvider
,可以从资产流式传输。
For multiple assets, this should work for the StreamProvider
XML metadata: 对于多个资产,这应该适用于
StreamProvider
XML元数据:
<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<asset
name="whatevs"/>
</paths>
That should resolve all content://your.authority.name.goes.here/whatevs/*
Uri
values (for various values of *
) to files inside of assets/
. 那应该将所有
content://your.authority.name.goes.here/whatevs/*
Uri
值(用于*
各种值)解析为assets/
文件。 If you want to limit the scope to some specific subdirectory of assets/
(say, assets/goodstuff/
), you would use: 如果要将范围限制为
assets/
(例如, assets/goodstuff/
)的某些特定子目录,则可以使用:
<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<asset
name="whatevs"
path="goodstuff/"/>
</paths>
And, if this does not work, it should, so feel free to file an issue with a reproducible test case. 并且,如果这不起作用,则应该随便提出一个可复制的测试用例的问题 。
Is this a good work-around or will this cause problems with the pdf-viewing app?
这是一个好的解决方法,还是会导致pdf查看应用出现问题?
startActivity()
is asynchronous, and so the external PDF viewer will never be able to access the file this way. startActivity()
是异步的,因此外部PDF查看器将永远无法以这种方式访问文件。
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