我试图用相机拍照,但我得到以下错误:

FATAL EXCEPTION: main
Process: com.example.marek.myapplication, PID: 6747
java.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();
        }
        // Continue only if the File was successfully created
        if (photoFile != null) {
            Uri photoURI = FileProvider.getUriForFile(this,
                    "com.example.marek.myapplication.fileprovider",
                    photoFile);
            takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
            startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
        }
    }

file_paths.xml

<?xml version="1.0" encoding="utf-8"?>
<paths>
    <files-path name="my_images" path="images/"/>
</paths>

我一整天都在搜索这个错误,试图理解FileProvider,但我不知道这个错误消息试图告诉我什么。如果你想要更多信息/代码,请在评论中告诉我。


当前回答

您的文件存储在getExternalFilesDir()下。它映射到<external-files-path>,而不是<files-path>。此外,您的文件路径中不包含图像/,因此XML中的path属性无效。

将res/xml/file_paths.xml替换为:

<?xml version="1.0" encoding="utf-8"?>
<paths>
    <external-files-path name="my_images" path="/" />
</paths>

更新 2020 3月 13

特定路径的提供者路径如下:

<files-path/>——> <cache-path/>——> <external-path/>——> Environment.getExternalStorageDirectory() <external-files-path/>——> Context.getExternalFilesDir(String) <external-cache-path/>——> Context.getExternalCacheDir() <external-media-path/>——> Context.getExternalMediaDirs()

裁判:https://developer.android.com/reference/androidx/core/content/FileProvider

其他回答

这些对我都没用。唯一可行的方法是不要在xml中声明显式路径。所以,这样做吧,快乐起来:

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

这里也有一个关于这个问题的优秀教程: https://www.youtube.com/watch?v=9ZxRTKvtfnY&t=613s

我确信我是迟到了,但以下几点对我很有用。

<paths>
    <root-path name="root" path="." />
</paths>

我有同样的问题,我尝试了下面的代码为其工作。

1.创建Xmlfile: provider_paths

<?xml version="1.0" encoding="utf-8"?>
<paths>
    <files-path name="my_images" path="myfile/"/>
</paths>

2. Mainfest排队

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

3.在你的Java文件中。

      File file =  new File(getActivity().getFilesDir(), "myfile");
        if (!file.exists()) {
            file.mkdirs();
        }
        String  destPath = file.getPath() + File.separator + attachmentsListBean.getFileName();

               file mfile = new File(destPath);
                Uri path;
                Intent intent = new Intent(Intent.ACTION_VIEW);
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N)
                {
                    path = FileProvider.getUriForFile(AppController.getInstance().getApplicationContext(), AppController.getInstance().getApplicationContext().getPackageName() + ".provider", mfile );
                    intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
                } else {
                    path = Uri.fromFile(mfile);
                }
   intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                    intent.setDataAndType(path, "image/*");
                    getActivity().startActivity(intent);

Android官方文档说file_paths.xml应该有:

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">   
    <external-path name="my_images"    
        path="Android/data/com.example.package.name/files/Pictures" />
</paths>

但是为了让它在最新的android中工作,在路径的末尾应该有一个“/”,就像这样:

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">   
    <external-path name="my_images"    
        path="Android/data/com.example.package.name/files/Pictures/" />
</paths>

试试这个

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