问题
In my classe I have a method that searches the image in the photo gallery and also receives the image taken from the camera of the mobile phone, I need now to save this image in the sqlite database. I am using a database field like BLOB, but not like serializing the image in bity [] or transforming in decode64 to write to the database.
I would like to know if anyone has any examples to pass on xaramin android I am posting the method that receives the image
protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
base.OnActivityResult(requestCode, resultCode, data);
// Make it available in the gallery
try
{
Intent mediaScanIntent = new Intent(Intent.ActionMediaScannerScanFile);
Uri contentUri = Uri.FromFile(App._file);
mediaScanIntent.SetData(contentUri);
SendBroadcast(mediaScanIntent);
// Display in ImageView. We will resize the bitmap to fit the display.
// Loading the full sized image will consume to much memory
// and cause the application to crash.
int height = Resources.DisplayMetrics.HeightPixels;
int width = imageView.Height;
App.bitmap = App._file.Path.LoadAndResizeBitmap(width, height);
if (App.bitmap != null)
{
imageView.SetImageBitmap(App.bitmap);
App.bitmap = null;
}
// Dispose of the Java side bitmap.
GC.Collect();
}
catch
{
}
try
{
if (resultCode == Result.Ok)
{
var imageView =
FindViewById<ImageView>(Resource.Id.imageView1);
imageView.SetImageURI(data.Data);
}
}
catch {
}
}
回答1:
Instead of storing & retrieving image(byte[]) as blob from sqlite db convert image to base64string and store image as string in sqlite and while retrieving convert received base64string from sqlite to image(byte[])
Base64 to Bitmap :
public Bitmap Base64ToBitmap(String base64String)
{
byte[] imageAsBytes = Base64.Decode(base64String, Base64Flags.Default);
return BitmapFactory.DecodeByteArray(imageAsBytes, 0, imageAsBytes.Length);
}
Bitmap to Base64 :
public String BitmapToBase64(Bitmap bitmap)
{
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
bitmap.Compress(Bitmap.CompressFormat.Png, 100, byteArrayOutputStream);
byte[] byteArray = byteArrayOutputStream.ToByteArray();
return Base64.EncodeToString(byteArray, Base64Flags.Default);
}
来源：https://stackoverflow.com/questions/43614282/how-to-save-images-to-sqlite-database