Android getUriForFile IllegalArgumentException

我用 Intent 发送文件的代码不适用于所有文件源，而且我还找不到解决方案：

我的应用程序已注册用于打开文件，因此当我在 ES 文件资源管理器中选择文件时，意图如下所示：

intent->mData->uriString=/storage/emulated/0/backups/apps/NextGenEndPoint_1.0.apk    

当选择相同的文件时华硕文件管理器我得到以下意图：

intent->mData->uriString=/file/sdcard/backups/apps/NextGenEndPoint_1.0.apk

这是我的代码：

        // With this path it works. Path example being sent by e.g ES File Explorer
        String fileName = "/storage/emulated/0/backups/apps/PDFViewer.apk";
        // with this path it doesn't. This path is sent by Asus File Explorer
        fileName = "/file/sdcard/backups/apps/PDFViewer.apk";
        final Intent installIntent = new Intent(Intent.ACTION_INSTALL_PACKAGE);
        installIntent.setData(getUriForFile(context, "com.myapp.fileprovider", new File(fileName)));
        installIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_GRANT_READ_URI_PERMISSION);
        context.startActivity(installIntent);

我还尝试了 new File("/file/sdcard/backups/apps/PDFViewer.apk").exists();什么返回 false。

The xml:

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

以及清单中的提供者：

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

例外情况：

 11-02 12:21:09.004: E/ACRA(9807): com.mycompany.myapp fatal error : Failed to find configured root that contains /file/sdcard/PDFViewer.apk
 11-02 12:21:09.004: E/ACRA(9807): java.lang.IllegalArgumentException: Failed to find configured root that contains /file/sdcard/PDFViewer.apk
 11-02 12:21:09.004: E/ACRA(9807):  at android.support.v4.content.FileProvider$SimplePathStrategy.getUriForFile(SourceFile:711)
 11-02 12:21:09.004: E/ACRA(9807):  at android.support.v4.content.FileProvider.getUriForFile(SourceFile:400)

我缺少什么？

在引用的文件中：

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

使用文件路径而不是外部路径

or

use Environment.getExternalStorageDirectory()