如何通过默认系统 pdf 应用程序中的 FileProvider 在 Xamarin.Android 中打开内部创建的 pdf? [英] How do I open an internally created pdf in Xamarin.Android via a FileProvider in the default system pdf app?
问题描述
我在我通过的私有本地目录中创建了一个 .pdf
文件(我尝试使用最少的权限):
I created a .pdf
file in the private local directory I got via (I try to work with the minimum of permissions):
string targetBaseDir = Environment.GetFolderPath(
Environment.SpecialFolder.Personal,
Environment.SpecialFolderOption.Create
);
官方 Android 文档 建议该文件应通过 FileProvider 共享.
The official Android documentation suggests that file should be shared via a FileProvider.
我还尝试获取一些代码来启动一个意图,我目前在:
I also tried to get some code to start an intent, and I'm currently at:
var fileUri = Android.Net.Uri.Parse(filePath);
var intent = new Intent();
intent.SetFlags(ActivityFlags.ClearTop);
intent.SetFlags(ActivityFlags.NewTask);
intent.SetAction(Intent.ActionView);
intent.SetType("application/pdf");
intent.PutExtra(Intent.ExtraStream, fileUri);
intent.AddFlags(ActivityFlags.GrantReadUriPermission);
Android.App.Application.Context.StartActivity(intent);
这会启动 pdf 文件的共享对话框,但当 Adobe Pdf 阅读器打开时,它显示一个空视图,而不是我的 pdf 文件.
This starts the share dialog for a pdf file but while the Adobe Pdf reader gets opened it shows an empty view and not my pdf file.
推荐答案
您需要使用 FileProvider 包装您的 URI.由于 android uri 会给你 file://
而 FileProvider 会给你 content://
,这是你真正需要的:
You need to wrap your URI with FileProvider. Since android uri will give you file://
while FileProvider will give you content://
, which you actually need:
public static Android.Net.Uri WrapFileWithUri(Context context,Java.IO.File file)
{
Android.Net.Uri result;
if (Build.VERSION.SdkInt < (BuildVersionCodes)24)
{
result = Android.Net.Uri.FromFile(file);
}
else
{
result = FileProvider.GetUriForFile(context, context.ApplicationContext.PackageName + ".provider", file);
}
return result;
}
文件可以这样创建:
var file = new Java.IO.File(filePath);
然后就可以打开了:
public static void View(Context context, string path, string mimeType)
{
Intent viewIntent = new Intent(Intent.ActionView);
Java.IO.File document = new Java.IO.File(path);
viewIntent.SetDataAndType(UriResolver.WrapFileWithUri(context,document),mimeType);
viewIntent.SetFlags(ActivityFlags.NewTask);
viewIntent.AddFlags(ActivityFlags.GrantReadUriPermission);
context.StartActivity(Intent.CreateChooser(viewIntent, "your text"));
}
请注意,这条线
viewIntent.SetDataAndType(UriResolver.WrapFileWithUri(context,document),mimeType);
不等于 SetData 和 SetType 分开命令.
does not equal to SetData and SetType separate commands.
是的,您需要将 FileProvider 添加到您的清单中:
And yes, you need to add FileProvider to your manifest:
<provider android:name="android.support.v4.content.FileProvider" android:authorities="${applicationId}.provider" android:exported="false" android:grantUriPermissions="true">
<meta-data android:name="android.support.FILE_PROVIDER_PATHS" android:resource="@xml/provider_paths" />
</provider>
您还需要使用 provider_paths.xml 文件创建 Resources\xml 文件夹:
Also you need to create Resources\xml folder with provider_paths.xml file:
<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<external-path name="external_files" path="."/>
<files-path name="internal_files" path="." />
</paths>
这篇关于如何通过默认系统 pdf 应用程序中的 FileProvider 在 Xamarin.Android 中打开内部创建的 pdf?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!