Android Fileprovider:IllegalArgumentException:无法找到包含以下内容的已配置根目录 [英] Android Fileprovider: IllegalArgumentException: Failed to find configured root that contains

问题描述

我对android FileProvider有疑问. 我想保存一个pdf文档，并使用默认程序打开它. 我不想将其保存在外部存储中.

I have a question about the android FileProvider. I want to save a pdf document and open it with a default program. I don´t want to save it in external Storage.

在我成功将pdf保存到FilesDirectory/export/temp.pdf后，
我试图使用FileProvider.getUriForFile()生成URI.

After I´ve successfully saved the pdf to the FilesDirectory/export/temp.pdf,
I´ve tried to generate an URI by using FileProvider.getUriForFile().

File path = new File(getFilesDir(), "export");
File pdf = new File(path + File.separator + "temp.pdf");
pdf.getParentFile().mkdirs();

if (!pdf.exists())
    pdf.createNewFile();

Uri uri = FileProvider.getUriForFile(getApplicationContext(), "?", pdf);

问题:作为第二个参数"Authority"，我必须传递什么-我的文件的位置，可以授予URI-Permissions的类或其他内容?无论我尝试过什么，都会导致IllegalArgumentException或NullPointerException. 我的FileProvider(XML):

Question: What do I have to pass as the second parameter "Authority" - the location of my Files, the class which can grant the URI-Permissions or something other? Whatever I´ve tried leaded to an IllegalArgumentException or a NullPointerException. My FileProvider (XML):

<provider         
    android:name="android.support.v4.content.FileProvider"           
        android:authorities="com.example.myApp.myActivity"
        android:exported="false"
        android:grantUriPermissions="true">

        <meta-data                 
             android:name="android.support.FILE_PROVIDER_PATHS"                           
             android:resource="@xml/file_path"/>                                       
</provider>

引用文件:

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <cache-path name="pdfTemplates" path="export/" />
</paths>

推荐答案

我知道了.有两个不同的问题

I´ve got it. There were two different Problems

1. CodeDiving回答了第一个问题. 我必须使用提供者声明中的Authority来进行getUriForFile调用.使用其他类会导致NullPointerException.

1. The first Issue was answered by CodeDiving. I had to use the Authority from the provider-declaration for the getUriForFile call. Using an other class caused the NullPointerException.

我尝试从filesDirectory获取文件，但是在我的file_path中，我仅声明了用于缓存Directory的路径.我将其更改为"files-path"，并且有效.此错误导致IllegalArgumentException.

I´ve tried to get a file from filesDirectory, but in my file_path I declared only a path to cache Directory. I changed it to 'files-path' and it worked. This error caused the IllegalArgumentException.

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