FileProvider-IllegalArgumentException：无法找到配置的根目录

Question

我正在尝试用相机拍照，但是出现以下错误：FATAL EXCEPTION: mainProcess: com.example.marek.myapplication, PID: 6747java.lang.IllegalArgumentException: Failed to find configured root that contains /storage/emulated/0/Android/data/com.example.marek.myapplication/files/Pictures/JPEG_20170228_175633_470124220.jpg    at android.support.v4.content.FileProvider$SimplePathStrategy.getUriForFile(FileProvider.java:711)    at android.support.v4.content.FileProvider.getUriForFile(FileProvider.java:400)    at com.example.marek.myapplication.MainActivity.dispatchTakePictureIntent(MainActivity.java:56)    at com.example.marek.myapplication.MainActivity.access$100(MainActivity.java:22)    at com.example.marek.myapplication.MainActivity$1.onClick(MainActivity.java:35)AndroidManifest.xml：<provider        android:name="android.support.v4.content.FileProvider"        android:authorities="com.example.marek.myapplication.fileprovider"        android:enabled="true"        android:grantUriPermissions="true">        <meta-data            android:name="android.support.FILE_PROVIDER_PATHS"            android:resource="@xml/file_paths" /></provider>Java：Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);    // Ensure that there's a camera activity to handle the intent    if (takePictureIntent.resolveActivity(getPackageManager()) != null) {        // Create the File where the photo should go        File photoFile = null;        try {            photoFile = createImageFile();        } catch (IOException ex) {            Toast.makeText(getApplicationContext(), "Error while saving picture.", Toast.LENGTH_LONG).show();        }  我整天都在搜索有关此错误的内容，并试图理解FileProvider，但是我不知道此错误消息试图告诉我什么。如果您需要更多信息/代码，请在评论中写信给我。

Answer 1

这可能会解决每个人的问题：添加了所有标签，因此您无需担心文件夹路径。将res / xml / file_paths.xml替换为：

<?xml version="1.0" encoding="utf-8"?>

<paths>

  <external-path

    name="external"

    path="." />

  <external-files-path

    name="external_files"

    path="." />

  <cache-path

    name="cache"

    path="." />

  <external-cache-path

    name="external_cache"

    path="." />

<files-path

    name="files"

    path="." />

</paths>

Answer 2

您的文件存储在下getExternalFilesDir()。那映射到<external-files-path>，不是<files-path>。另外，文件路径中不包含文件路径images/，因此pathXML中的属性无效。

替换res/xml/file_paths.xml为：

<?xml version="1.0" encoding="utf-8"?>

<paths>

    <external-files-path name="my_images" path="/" />

</paths>