一、背景

之前的保存图片吧，在Android11之前，我会去申请WIRITE权限，11之后，我又去申请MANAGE_EXTERNAL_STORAGE这个权限，该权限将授权读写所有共享存储内容，这也将同时包含非媒体类型的文件。但是在google上架的时候，MANAGE_EXTERNAL_STORAGE属于敏感权限，需要向谷歌做声明，做了，没过，谷歌说可以不要这个权限也可以保存，看来是我无知了，于是去研究了一下下，有了下面的方法。

二、实现

    @SuppressLint("UseCompatLoadingForDrawables")@AfterPermissionGranted(200)fun saveFreshAppImageToGallery(context: PreViewActivity, imageResId: Int) {val drawable = context.getDrawable(imageResId)if (drawable is BitmapDrawable) {val bitmap = drawable.bitmapval displayName = "${System.currentTimeMillis()}.jpg"val values = ContentValues().apply {put(MediaStore.Images.Media.DISPLAY_NAME, displayName)put(MediaStore.Images.Media.MIME_TYPE, "image/jpeg")put(MediaStore.Images.Media.DATE_ADDED, System.currentTimeMillis() / 1000)}val contentResolver = context.contentResolverval collection =MediaStore.Images.Media.getContentUri(MediaStore.VOLUME_EXTERNAL_PRIMARY)val item = contentResolver.insert(collection, values)item?.let { uri ->try {val outputStream = contentResolver.openOutputStream(uri)bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outputStream)outputStream?.close()Toast.makeText(context, "Save successfully!", Toast.LENGTH_SHORT).show()val mediaScanIntent = Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE)mediaScanIntent.data = uricontext.sendBroadcast(mediaScanIntent)} catch (e: Exception) {Toast.makeText(context, "Save Failed!", Toast.LENGTH_SHORT).show()e.printStackTrace()}}}}

其中：通知相册刷新的逻辑是下面代码

val mediaScanIntent = Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE)
mediaScanIntent.data = uri
context.sendBroadcast(mediaScanIntent)

或者下面的方法

    private fun saveToGallery(photoFile: File) {val contentValues = ContentValues().apply {put(MediaStore.Images.Media.DISPLAY_NAME, "photo.jpg")put(MediaStore.Images.Media.MIME_TYPE, "image/jpeg")if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {put(MediaStore.Images.Media.IS_PENDING, 1)}}val contentResolver = contentResolverval collectionUri = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {MediaStore.Images.Media.getContentUri(MediaStore.VOLUME_EXTERNAL_PRIMARY)} else {MediaStore.Images.Media.EXTERNAL_CONTENT_URI}val imageUri = contentResolver.insert(collectionUri, contentValues)imageUri?.let { uri ->try {contentResolver.openOutputStream(uri)?.use { outputStream ->val inputStream = FileInputStream(photoFile)inputStream.copyTo(outputStream)inputStream.close()outputStream.close()}if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {contentValues.clear()contentValues.put(MediaStore.Images.Media.IS_PENDING, 0)contentResolver.update(uri, contentValues, null, null)}} catch (e: IOException) {}}}

原理都是一样的