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

花了两周时间试图找到一些解决方案…如果你在尝试了以上所有方法后到达这里:

1 -验证你的标签提供者是否在标签应用程序内

<application>

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

</application>

2 -如果你尝试了很多方法都没有成功,那么就用这个方法来测试:

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

  <root-path name="root" path="." />
  <files-path name="my_images" path="/" />
  <files-path name="my_images" path="myfile/"/>
  <files-path name="files" path="." />

  <external-path name="external_files" path="." />
  <external-path name="images" path="Pictures" />
  <external-path name="my_images" path="." />
  <external-path name="my_images" path="Android/data/com.companyname.yourproject/files/Pictures" />
  <external-path name="my_images" path="Android/data/com.companyname.yourproject/files/Pictures/" />

  <external-files-path name="images" path="Pictures"/>
  <external-files-path name="camera_image" path="Pictures/"/>
  <external-files-path name="external_files" path="." />
  <external-files-path name="my_images" path="my_images" />

  <external-cache-path name="external_cache" path="." />

</paths>

测试这个,如果相机工作,然后开始消除一些线,并继续测试…

3 -不忘记验证相机是否在模拟器中激活。

其他回答

你好,朋友,试试这个

在这段代码中

1)如何在清单中声明2个文件提供程序。

2)第一个文件下载提供商

3)第二供应商用于相机和画廊

步骤1

     <provider
        android:name="android.support.v4.content.FileProvider"
        android:authorities="${applicationId}.fileprovider"
        android:exported="false"
        android:grantUriPermissions="true">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/provider_paths" />
    </provider>

Provider_paths.xml

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

第二个供应商

     <provider
        android:name=".Utils.MyFileProvider"
        android:authorities="${applicationId}.provider"
        android:exported="false"
        android:grantUriPermissions="true"
        tools:replace="android:authorities"
        tools:ignore="InnerclassSeparator">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/file_path" />
    </provider>

file_path.xml

<?xml version="1.0" encoding="utf-8"?>
<paths>
<external-path name="storage/emulated/0" path="."/>
</paths>

.Utils.MyFileProvider

创建类MyFileProvider(只创建类,不声明任何方法)

当你使用文件提供程序时使用(.fileprovider)这个名称,而你使用图像(. Provider)使用这个名称。

如果有任何一个问题来理解这段代码,你可以联系rp1741995@gmail.com我会帮助你。

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);

如果你的文件路径是/storage/emulated/0/"yourfile"

你只需要修改你的FileProvider xml

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

当你需要共享文件时调用这个函数

Intent sharingIntent = new Intent(Intent.ACTION_SEND);
                    Uri fileUri = FileProvider.getUriForFile(getContext(),
                            "com.example.myapp.fileprovider",
                            file);
                    sharingIntent.setType("*/*"); // any flie type
                    sharingIntent.putExtra(Intent.EXTRA_STREAM, fileUri);
                    startActivity(Intent.createChooser(sharingIntent, "Share file"));

它在android M ~ Pie上工作

这也让我有点困惑。

问题是在“路径”属性在你的xml文件。

从这个文档FileProvider path是一个子目录, 但在另一个文档(camera/photobasics)中显示 'path'是全路径。

<?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>

我只需要把path改成full path就可以了。

更改main/res/xml/provider_paths.xml

<paths>
    <files-path path="images/" name="myimages" />
    <external-path name="download" path="download/"/>
</paths>

To

<?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>