问题描述
我正在尝试将图像发布到特定文件夹中。我已经成功地做到了这一点。但为了获取数据,我一直在使用 MediaStore.Images.ImageColumns.DATA 已弃用且因此我想使用更新的方法来检索信息。
我使用以下代码保存了图像并且完全正常
suspend fun saveImage(context: Context,bitmap: Bitmap) {
withContext(dispatchers.IO) {
val collection =
MediaStore.Images.Media.getContentUri(MediaStore.VOLUME_EXTERNAL_PRIMARY)
val dirDest = File(
Environment.DIRECTORY_PICTURES,context.getString(R.string.app_name) + File.separator + CAMERA
)
val filePath = dirDest.absolutePath
val date = System.currentTimeMillis()
val newImage = ContentValues().apply {
put(MediaStore.Images.Media.disPLAY_NAME,"$date.$IMAGE_EXTENSIONS")
put(MediaStore.MediaColumns.MIME_TYPE,"image/$IMAGE_EXTENSIONS")
put(MediaStore.MediaColumns.DATE_ADDED,date)
put(MediaStore.MediaColumns.DATE_MODIFIED,date)
put(MediaStore.MediaColumns.SIZE,bitmap.byteCount)
put(MediaStore.MediaColumns.WIDTH,bitmap.width)
put(MediaStore.MediaColumns.HEIGHT,bitmap.height)
put(MediaStore.MediaColumns.RELATIVE_PATH,"$dirDest${File.separator}")
put(MediaStore.Images.Media.IS_PENDING,1)
}
val newImageUri = context.contentResolver.insert(collection,newImage)
context.contentResolver.openOutputStream(newImageUri!!,"w").use {
bitmap.compress(Bitmap.CompressFormat.JPEG,100,it)
}
newImage.clear()
newImage.put(MediaStore.Images.Media.IS_PENDING,0)
context.contentResolver.update(newImageUri,newImage,null,null)
}
}
问题在于检索信息时。 我使用的代码如下:
private fun getData() {
lifecycleScope.launch(dispatchers.IO) {
val collection = sdk29AndUp {
MediaStore.Images.Media.getContentUri(MediaStore.VOLUME_EXTERNAL)
} ?: MediaStore.Images.Media.EXTERNAL_CONTENT_URI
val file = File(
Environment.DIRECTORY_PICTURES,requireContext().getString(R.string.app_name) + File.separator + CAMERA
)
val filePath = file.absolutePath
val selection = MediaStore.Images.ImageColumns.DATA + " like '%" + filePath + "%'"
val projection = arrayOf(
MediaStore.Images.Media._ID,MediaStore.Images.Media.disPLAY_NAME
)
val photoList = mutablelistof<SharedStoragePhoto>()
contentResolver?.query(
collection,projection,selection,null
)?.use { cursor ->
val idColumn = cursor.getColumnIndexOrThrow(MediaStore.Images.Media._ID)
val displayNameColumn = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.disPLAY_NAME)
while (cursor.movetoNext()) {
val id = cursor.getLong(idColumn)
val displayName = cursor.getString(displayNameColumn)
photoList.add(SharedStoragePhoto(id,displayName))
}
}
}
}
由于不推荐使用 MediaStore.Images.ImageColumns.DATA,请提出解决方法。 提前致谢
解决方法
正如@blackapps 所回答的那样。这是使用RELATIVE_PATH解决问题的方法
private fun getData() {
lifecycleScope.launch(Dispatchers.IO) {
val collection = sdk29AndUp {
MediaStore.Images.Media.getContentUri(MediaStore.VOLUME_EXTERNAL)
} ?: MediaStore.Images.Media.EXTERNAL_CONTENT_URI
val selection =
MediaStore.Images.ImageColumns.RELATIVE_PATH + " like '%" + CAMERA + "%'"
val projection = arrayOf(
MediaStore.Images.Media._ID,MediaStore.Images.Media.DISPLAY_NAME,MediaStore.Images.Media.RELATIVE_PATH
)
contentResolver?.query(
collection,projection,selection,null,null
)?.use { cursor ->
val idColumn = cursor.getColumnIndexOrThrow(MediaStore.Images.Media._ID)
val displayNameColumn =
cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DISPLAY_NAME)
val relativePathColumn =
cursor.getColumnIndexOrThrow(MediaStore.Images.Media.RELATIVE_PATH)
while (cursor.moveToNext()) {
val id = cursor.getLong(idColumn)
val displayName = cursor.getString(displayNameColumn)
val relativePath = cursor.getString(relativePathColumn)
val contentUri = ContentUris.withAppendedId(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI,id
)
)
}
}
cursor.close()
}
}
}