Android Q Kotlin-API 29:检查图像是否存在 [英] Android Q Kotlin - API 29: check if image exists
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问题描述
这是我用来在Android Q中保存图像的代码:
This is the code I'm using to save image in Android Q:
private var fileName = ""
private fun downloadImage(){
val folderName = "Funny"
fileName = "bla_" + dlImageURL.split("/").toTypedArray().last()
// find out here if this image already exists
val requestOptions = RequestOptions()
.skipMemoryCache(true)
.diskCacheStrategy(DiskCacheStrategy.NONE)
val bitmap = Glide.with(this@DownloadImage)
.asBitmap()
.load(dlImageURL)
.apply(requestOptions)
.submit()
.get()
try {
val values = ContentValues()
values.put(MediaStore.Images.Media.MIME_TYPE, "image/jpeg")
values.put(MediaStore.Images.Media.DATE_ADDED, System.currentTimeMillis() / 1000)
values.put(MediaStore.Images.Media.RELATIVE_PATH, "Pictures/$folderName")
values.put(MediaStore.Images.Media.IS_PENDING, true)
values.put(MediaStore.Images.Media.DATE_TAKEN, System.currentTimeMillis())
values.put(MediaStore.Images.Media.DISPLAY_NAME, fileName)
values.put(MediaStore.Images.Media.TITLE, fileName)
// RELATIVE_PATH and IS_PENDING are introduced in API 29.
val uri: Uri? = this@DownloadImage.contentResolver.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values)
if (uri != null) {
saveImageToStream(bitmap, this@DownloadImage.contentResolver.openOutputStream(uri))
values.put(MediaStore.Images.Media.IS_PENDING, false)
this@DownloadImage.contentResolver.update(uri, values, null, null)
}
} catch (e: Exception) {
}
}
private fun saveImageToStream(bitmap: Bitmap, outputStream: OutputStream?) {
if (outputStream != null) {
try {
bitmap.compress(Bitmap.CompressFormat.JPEG, 95, outputStream)
outputStream.close()
} catch (e: Exception) {
e.printStackTrace()
}
}
}
在下载图像之前,如何确定该图像是否已存在于图库中?我评论了它的位置.
How can I find out if this image already exists in the gallery before I download it? I commented where it needs to be.
我已经抬起头来,无法找到该死的路,这要容易得多< API 29
I already looked up and can't find out how to get the damn path, it was much easier < API 29
推荐答案
我使用ContentResolver.query()方法编写了示例代码.因此,我尝试使用AndroidQ.示例如下:
I wrote sample code with ContentResolver.query() method. So I tried with Android Q. Sample is like this:
val projection = arrayOf(
MediaStore.Images.Media.DISPLAY_NAME,
MediaStore.MediaColumns.RELATIVE_PATH
)
val path = "Pictures/$folderName"
val name = fileName
val selection = MediaStore.Files.FileColumns.RELATIVE_PATH + " like ? and "+ MediaStore.Files.FileColumns.DISPLAY_NAME + " like ?"
val selectionargs = arrayOf("%" + path + "%", "%" + name + "%")
val cursor = context.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, projection, selection, selectionargs, null);
val indexDisplayName = cursor?.getColumnIndex(MediaStore.Images.Media.DISPLAY_NAME)
if(cursor!!.count > 0){
// file is exist
}
// or you can see displayName
while (cursor!!.moveToNext()) {
val displayName = indexDisplayName?.let { cursor.getString(it) }
}
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