FileProvider.getUriForFile 正在抛出 StringIndexOutOfBoundsException

问题描述

首先要提到的是，问题的答案此处没有帮助.

源代码如下所示:

Intent intent = new Intent("com.mycompany.action.PICK_FILE");String authority = "com.mycompany.fileprovider";文件文件 = Environment.getExternalStorageDirectory();intent.setData(FileProvider.getUriForFile(this, authority, file));

FileProvider.getUriForFile 抛出异常，这里是堆栈跟踪:

java.lang.StringIndexOutOfBoundsException: length=15;指数=16在 java.lang.String.indexAndLength(String.java:500)在 java.lang.String.substring(String.java:1313)在 android.support.v4.content.FileProvider$SimplePathStrategy.getUriForFile(FileProvider.java:687)在 android.support.v4.content.FileProvider.getUriForFile(FileProvider.java:377)

在 Application 标签内的 AndroidManifest.xml 中，我添加了以下内容:

file_paths.xml 的内容如下:

<external-path name="input_files" path="."/><external-path name="output_files" path="MyAppName/"/></路径>

output_files 路径不在此上下文中使用.

我已经通过 FileProvider.SimplePathStrategy.getUriForFile() 运行调试器.相关代码片段如下(第 683-688 行):

 final String rootPath = mostSpecific.getValue().getPath();如果(rootPath.endsWith(/")){path = path.substring(rootPath.length());} 别的 {path = path.substring(rootPath.length() + 1);}

rootPath 被评估为 /storage/sdcard 这也是 path 的确切值，所以抛出异常也就不足为奇了.

我做错了什么?

更新:

按照下面的建议，传递的 java.io.File 不应该是目录.文档含糊不清，从不明确说明.解决方法是手动"创建 uri.于是

intent.setData(FileProvider.getUriForFile(this, authority, file));

应替换为:

intent.setData(Uri.parse("content://" + file.getAbsolutePath()));

解决方案

getUriForFile 的第三个参数，应该是带有文件名的文件的路径.这里有一个文档，请阅读.>

First thing to mention, answers to the question here do not help.

The source code looks like the following:

Intent intent    = new Intent("com.mycompany.action.PICK_FILE");
String authority = "com.mycompany.fileprovider";
File   file      = Environment.getExternalStorageDirectory();

intent.setData(FileProvider.getUriForFile(this, authority, file));

FileProvider.getUriForFile is throwing the exception and here is the stack trace:

java.lang.StringIndexOutOfBoundsException: length=15; index=16
at java.lang.String.indexAndLength(String.java:500)
at java.lang.String.substring(String.java:1313)
at android.support.v4.content.FileProvider$SimplePathStrategy.getUriForFile(FileProvider.java:687)
at android.support.v4.content.FileProvider.getUriForFile(FileProvider.java:377)

In AndroidManifest.xml inside of application tag I have added the following:

        <provider
            android:name="android.support.v4.content.FileProvider"
            android:authorities="com.mycompany.fileprovider"
            android:exported="false"
            android:grantUriPermissions="true"
            >
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/file_paths"
            />
        </provider>

Content of file_paths.xml is the following:

<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path name="input_files"  path="." />
    <external-path name="output_files" path="MyAppName/" />
</paths>

output_files path is not used in this context.

I have run debugger through FileProvider.SimplePathStrategy.getUriForFile(). Relevant code snippet is the following (lines 683-688):

            final String rootPath = mostSpecific.getValue().getPath();
            if (rootPath.endsWith("/")) {
                path = path.substring(rootPath.length());
            } else {
                path = path.substring(rootPath.length() + 1);
            }

rootPath is evaluated as /storage/sdcard which is also the exact value of path, so it's not wonder that the exception is thrown.

What am I doing wrong?

UPDATE:

As suggested bellow, passed java.io.File should not be a directory. Docs are ambiguous and never say that explicitly. The workaround would be to create uri 'manually'. Thus

intent.setData(FileProvider.getUriForFile(this, authority, file));

should be replaced with:

intent.setData(Uri.parse("content://" + file.getAbsolutePath()));

解决方案

Third params to getUriForFile, should be your path to your file with file name. Here is an docs, read it.

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