android - java.io.FileNotFoundException : fileprovider 错误

Question

我知道有很多关于 fileProvider 的帖子，但我似乎无法在那里找到我的问题的答案。

我使用以下 Intent 拍摄图像:

private fun openCamera() {
    currentFocus?.clearFocus()
    val intent = Intent(MediaStore.INTENT_ACTION_STILL_IMAGE_CAMERA)
    if (intent.resolveActivity(packageManager) != null) {
        startActivity(intent)
    }
}

为了完成这项工作，我还有一个观察者:

 fun observe(): Flowable<Picture> =
        pictureSubject.onBackpressureLatest()
                .map { uri ->
                    appContext.get()?.let {
                        val cursor = it.contentResolver.query(uri, null, null, null, "date_added DESC, _id DESC")
                        if (cursor != null) {
                            if (cursor.moveToNext()) {
                                val dataColumn = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DATA)
                                val filePath = cursor.getString(dataColumn)
                                val name = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DISPLAY_NAME)
                                return@map Picture()
                                        .apply {
                                            this.name = cursor.getString(name)
                                            this.path = filePath
                                        }
                            }
                            cursor.close()
                        }
                        return@map Picture()
                    }
                    return@map Picture()
                }

然后将这些图片添加到一个称为文件的对象中。

fun listenForGeneralPictures(observe: Flowable<Picture>?) {
        observe?.apply {
            generalPictureDisposable = concatMap {
                if (it.name?.isNotEmpty() == true
                        && it.path?.isNotEmpty() == true
                        && file != null) {
                    it.categoryNr = Picture.CAT_GENERAL_PICTURES
                    file?.generalPictures?.add(it)
                    Log.d(it.name.toString(), "pictureAfter")
                    return@concatMap fileRepository.update(file!!)
                } else {
                    return@concatMap Flowable.just(file)
                }

            }.subscribe({
                cachedFile?.generalPictures = it!!.generalPictures
            }, errorUtils::onError)
        }

    }

我正在使用它来获取路径并将图像设置为 Imageview:

  override fun showPicture(path: String?) {
    val pictureFile = File(path)
    ivDraw?.setImageUri(FileProvider.getUriForFile(this, this.applicationContext.packageName + ".provider", pictureFile))
}

但是当我这样做时，我得到一个错误:

System.err: java.io.FileNotFoundException: /external_path/DCIM/Camera/20180801_115654(1).jpg (No such file or directory) at java.io.FileInputStream.open(Native Method) at java.io.FileInputStream.(FileInputStream.java:146) at java.io.FileInputStream.(FileInputStream.java:99) at android.content.ContentResolver.openInputStream(ContentResolver.java:708) at com.insypro.inspector3.ui.custom.picturedraw.DrawImageView.rotateImageToTakenDirection(DrawImageView.kt:108) at com.insypro.inspector3.ui.custom.picturedraw.DrawImageView.setImageUri(DrawImageView.kt:54) at com.insypro.inspector3.ui.picture.PictureViewActivity.showPicture(PictureViewActivity.kt:124) at com.insypro.inspector3.ui.picture.PicturePresenter.processPicture(PicturePresenter.kt:69) at com.insypro.inspector3.ui.picture.PicturePresenter.access$processPicture(PicturePresenter.kt:24) at com.insypro.inspector3.ui.picture.PicturePresenter$loadDataPicture$1.accept(PicturePresenter.kt:51)

我还有一个 fileprovider 文件和 list 中所需的一切:

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

和路径:

<paths>
<files-path name="files" path="." />
<cache-path name="cache" path="/"/>
<external-path name="external_path" path="." />
<external-files-path name="external_files" path="." />

Answer 1

嗯，首先你需要了解 FileProvider 在哪里 是为了。它用于以安全的方式将本地文件共享给其他 应用程序:https://developer.android.com/reference/android/support/v4/content/FileProvider

您只在您自己的 应用程序中使用图像文件。因此根本不需要使用 FileProvider。

要显示图像，请使用 BitmapFactory，注意 your_path 是图像的完整路径，不会被 FileProvider 更改:

val bitmap = BitmapFactory.decodeFile(your_path);
ivDraw.setImageBitmap(bitmap);