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。
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);
检查您的设备提供了多少存储空间—不支持从辅助存储空间共享文件。查看FileProvider.java源代码(from support-core-utils 25.3.1):
} else if (TAG_EXTERNAL_FILES.equals(tag)) {
File[] externalFilesDirs = ContextCompat.getExternalFilesDirs(context, null);
if (externalFilesDirs.length > 0) {
target = externalFilesDirs[0];
}
} else if (TAG_EXTERNAL_CACHE.equals(tag)) {
File[] externalCacheDirs = ContextCompat.getExternalCacheDirs(context);
if (externalCacheDirs.length > 0) {
target = externalCacheDirs[0];
}
}
所以，他们只取第一个存储空间。
此外，您还可以看到getExternalCacheDirs()用于通过ContextCompat接口获取存储列表。请参阅文档了解它的限制(例如，它被告知不能识别USB闪存)。最好的方法是自己对这个API的存储列表进行一些调试输出，这样就可以检查存储的路径与传递给getUriForFile()的路径是否匹配。
谷歌的问题跟踪器中已经分配了一张票(截至06-2017年)，要求支持多个存储。最后，我也找到了一个关于这个问题的问题。
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。
