我很有趣,可以将位图另存为PNG或JPG(两者均不起作用),但是似乎使用的内容值未按预期工作。
我想念什么?
fun Bitmap.save(context: Context) {
val contentResolver = context.contentResolver
val contentValues = ContentValues().apply {
put(MediaStore.MediaColumns.DISPLAY_NAME, "test.png")
put(MediaStore.MediaColumns.TITLE, "test")
put(MediaStore.MediaColumns.MIME_TYPE, "image/png")
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
put(MediaStore.MediaColumns.RELATIVE_PATH, Environment.DIRECTORY_PICTURES)
put(MediaStore.MediaColumns.IS_PENDING, 1)
}
}
val contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI
contentResolver.insert(contentUri, contentValues)
}
实际文件名为1592205828045(某些时间戳记)
实际文件类型为jpg和0B-因为未正确保存?
您正在创建文件,但仍需要将其写入Bitmap
:
fun Bitmap.save(context: Context) {
...
val bitmap = this
val maxImageQuality = 100
val uri = contentResolver.insert(contentUri, contentValues)
if (uri != null) {
try {
contentResolver.openFileDescriptor(uri, "w", null)?.use {
if (it.fileDescriptor != null) {
with(FileOutputStream(it.fileDescriptor)) {
bitmap.compress(
Bitmap.CompressFormat.PNG,
maxImageQuality, this
)
flush()
close()
}
}
}
} catch (e: Exception) {
e.printStackTrace()
}
// release pending status of the file
contentValues.clear()
contentValues.put(MediaStore.Images.Media.IS_PENDING, 0)
contentResolver.update(uri, contentValues, null, null)
// notify media scanner there's a new picture
MediaScannerConnection.scanFile(context, arrayOf(uri.toString()), null, null)
}
// don't forget to recycle the bitmap when you don't need it any longer
bitmap.recycle()
}