android - ActivityResultContracts.TakePicture 返回 "No such file or directory"

Question

在 Fragment 中，我尝试从相机中捕获图像并使用它。我想用 ActivityResultContracts.TakePicture()但是当我在捕获后尝试使用此图像时，我得到:

W/ImageView: Unable to open content: content://com.myniprojects.pixagram/my_images/default_image.jpg
    java.io.FileNotFoundException: open failed: ENOENT (No such file or directory)

我看过这个问题 ActivityResultContracts.TakePicture()但我不知道我做错了什么。这是我所做的一切:
关注 this docks为了体现我添加:

<provider
    android:name="androidx.core.content.FileProvider"
    android:authorities="com.myniprojects.pixagram"
    android:exported="false"
    android:grantUriPermissions="true">
    <meta-data
        android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/file_paths" />
</provider>

在 res/xml我创建了文件 file_paths :

<paths>
    <files-path
        name="my_images"
        path="images/" />
</paths>

在 fragment 中:

class AddFragment : Fragment(R.layout.fragment_add)
{
    private lateinit var imagePath: File
    private lateinit var newFile: File
    private lateinit var uri: Uri

    override fun onViewCreated(view: View, savedInstanceState: Bundle?)
    {
        super.onViewCreated(view, savedInstanceState)

        //...

        imagePath = File(requireContext().filesDir, "images")
        newFile = File(imagePath, "default_image.jpg")
        uri = getUriForFile(
            requireContext(),
            requireContext().applicationContext.packageName,
            newFile
        )

        binding.butMakeNewImage.setOnClickListener {
            takePicture.launch(uri)
        }
    }

    private val takePicture = registerForActivityResult(ActivityResultContracts.TakePicture()) { isSaved ->
        if (isSaved)
        {
            binding.imgSelected.setImageURI(uri)
        }
    }
}

如果有帮助，这是完整的错误日志

2021-01-16 16:15:38.871 9433-9433/com.myniprojects.pixagram W/ImageView: Unable to open content: content://com.myniprojects.pixagram/my_images/default_image.jpg
    java.io.FileNotFoundException: open failed: ENOENT (No such file or directory)
        at android.os.ParcelFileDescriptor.openInternal(ParcelFileDescriptor.java:315)
        at android.os.ParcelFileDescriptor.open(ParcelFileDescriptor.java:220)
        at androidx.core.content.FileProvider.openFile(FileProvider.java:566)
        at android.content.ContentProvider.openAssetFile(ContentProvider.java:1740)
        at android.content.ContentProvider.openTypedAssetFile(ContentProvider.java:1922)
        at android.content.ContentProvider.openTypedAssetFile(ContentProvider.java:1989)
        at android.content.ContentProvider$Transport.openTypedAssetFile(ContentProvider.java:539)
        at android.content.ContentResolver.openTypedAssetFileDescriptor(ContentResolver.java:1698)
        at android.content.ContentResolver.openAssetFileDescriptor(ContentResolver.java:1514)
        at android.content.ContentResolver.openInputStream(ContentResolver.java:1198)
        at android.graphics.ImageDecoder$ContentResolverSource.createImageDecoder(ImageDecoder.java:282)
        at android.graphics.ImageDecoder.decodeDrawableImpl(ImageDecoder.java:1743)
        at android.graphics.ImageDecoder.decodeDrawable(ImageDecoder.java:1736)
        at android.widget.ImageView.getDrawableFromUri(ImageView.java:1023)
        at android.widget.ImageView.resolveUri(ImageView.java:992)
        at android.widget.ImageView.setImageURI(ImageView.java:561)
        at androidx.appcompat.widget.AppCompatImageView.setImageURI(AppCompatImageView.java:120)
        at com.myniprojects.pixagram.ui.fragments.AddFragment$takePicture$1.onActivityResult(AddFragment.kt:105)
        at com.myniprojects.pixagram.ui.fragments.AddFragment$takePicture$1.onActivityResult(AddFragment.kt:30)
        at androidx.activity.result.ActivityResultRegistry.doDispatch(ActivityResultRegistry.java:361)
        at androidx.activity.result.ActivityResultRegistry.dispatchResult(ActivityResultRegistry.java:321)
        at androidx.activity.ComponentActivity.onActivityResult(ComponentActivity.java:631)
        at androidx.fragment.app.FragmentActivity.onActivityResult(FragmentActivity.java:164)
        at android.app.Activity.dispatchActivityResult(Activity.java:8412)
        at android.app.ActivityThread.deliverResults(ActivityThread.java:5580)
        at android.app.ActivityThread.handleSendResult(ActivityThread.java:5628)
        at android.app.servertransaction.ActivityResultItem.execute(ActivityResultItem.java:51)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:149)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:103)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2473)
        at android.os.Handler.dispatchMessage(Handler.java:110)
        at android.os.Looper.loop(Looper.java:219)
        at android.app.ActivityThread.main(ActivityThread.java:8347)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1055)
2021-01-16 16:15:38.871 9433-9433/com.myniprojects.pixagram W/ImageView: resolveUri failed on bad bitmap uri: content://com.myniprojects.pixagram/my_images/default_image.jpg

在 docs我们可以阅读

An ActivityResultContract to take a picture saving it into the provided content-Uri.Returns true if the image was saved into the given Uri.

那么为什么我得到 true尝试使用 Uri 中的此图像后，何时出现错误？

Answer 1

我终于想出了怎么做。我不确定，但我认为问题中的文件/Uri 有问题。以下是如何捕获图像的分步解决方案。

依赖:

implementation "androidx.activity:activity-ktx:1.2.0-rc01"
implementation "androidx.fragment:fragment-ktx:1.3.0-rc01"
implementation "com.github.bumptech.glide:glide:4.11.0"

list :

<uses-permission android:name="android.permission.CAMERA" />

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

res/xml/file_paths.xml (com.example.name 应该改为正确的包名)

<paths>
    <external-path name="my_images"
        path="Android/data/com.example.name/files/Pictures" />
</paths

检查是否 Manifest.permission.CAMERA被授予。如果没有请求许可。

在 fragment 中创建 ActivityResultLauncher像这样:

private lateinit var uri: Uri

private val takePicture = registerForActivityResult(ActivityResultContracts.TakePicture()) { isSaved ->
    if (isSaved)
    {
        glide
            .load(uri)
            .into(binding.imgSelected)
    }
}

启动takePicture (例如点击按钮)

binding.butMakeNewImage.setOnClickListener {

    val photoFile = File.createTempFile(
        "IMG_",
        ".jpg",
        requireContext().getExternalFilesDir(Environment.DIRECTORY_PICTURES)
    )

    uri = FileProvider.getUriForFile(
        requireContext(),
        "${requireContext().packageName}.provider",
        photoFile
    )

    takePicture.launch(uri)
}

小费。如果您收到消息 permission denial API 级别低于 21 ，尝试这样做:

val resultLauncher = registerForActivityResult(
    object : ActivityResultContracts.TakePicture()
    {
        override fun createIntent(
            context: Context,
            input: Uri
        ): Intent
        {
            val intent = super.createIntent(context, input)
            if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.LOLLIPOP)
            {
                intent.clipData = ClipData.newRawUri("", input)
                intent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION or Intent.FLAG_GRANT_READ_URI_PERMISSION)
            }
            return intent
        }
    }) { success ->
    if (success)
    {
        // TODO
    }
}

resultLauncher.launch(photoUri)