How to Save bitmap to `Pictures`?

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How to Save bitmap to `Pictures`?

mc 5,426

in xamarin.android I have an Android.Graphics.Bitmap and how to save it to the Pictures?

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Answer 1

JarvanZhang 23,971

Hello,

Welcome to our Microsoft Q&A platform!

I have an Android.Graphics.Bitmap and how to save it to the Pictures

To save the bitmap to Android storage, you could create a FileStream object with the path and then call the Bitmap.Compress method to generate the picture.

Check the code:

   var folder = Android.OS.Environment.ExternalStorageDirectory.AbsolutePath;  
   var filePath = System.IO.Path.Combine(folder, "test.png");  
   var stream = new FileStream(filePath, FileMode.Create);  
     
   //get the bitmap  
     
   bitmap.Compress(Bitmap.CompressFormat.Png, 100, stream);  
   stream.Close();

Best Regards,

Jarvan Zhang

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mc 5,426 Reputation points

2021-07-07T06:11:00.797+00:00

can the bitmap compress muti times?
JarvanZhang 23,971 Reputation points

2021-07-07T06:30:49.403+00:00

Do you mean storing the bitmap as multi pictures? It's supported to do that.
mc 5,426 Reputation points

2021-07-08T02:01:40.917+00:00

But As I know If I compress for muti-times there will be an error.

JarvanZhang 23,971

Hi, I tried the following two ways to test the bitmap compress and both works fine.

public void storeBitmap()
{
    var path = Android.OS.Environment.ExternalStorageDirectory.AbsolutePath;
    string filename = System.IO.Path.Combine(path, "test_1.png");
    Directory.CreateDirectory(path);
    var stream = new FileStream(filename, FileMode.CreateNew);

    var drawable = (BitmapDrawable)Resources.GetDrawable(Resource.Drawable.one);
    var bitmap = drawable.Bitmap;
    bitmap.Compress(Bitmap.CompressFormat.Png, 80, stream);
    stream.Close();

    string filename2 = System.IO.Path.Combine(path, "test_2.png");
    var stream2 = new FileStream(filename2, FileMode.CreateNew);
    bitmap.Compress(Bitmap.CompressFormat.Png, 80, stream2);
    stream2.Close();
}

public void storeBitmap()
{
    var path = Android.OS.Environment.ExternalStorageDirectory.AbsolutePath;
    string filename = System.IO.Path.Combine(path, "test_1.png");

    Directory.CreateDirectory(path);
    var stream = new FileStream(filename, FileMode.CreateNew);

    var drawable = (BitmapDrawable)Resources.GetDrawable(Resource.Drawable.one);
    var bitmap = drawable.Bitmap;
    bitmap.Compress(Bitmap.CompressFormat.Png, 80, stream);
    bitmap.Compress(Bitmap.CompressFormat.Png, 80, stream);
    bitmap.Compress(Bitmap.CompressFormat.Png, 80, stream);//call the command mulit times will effect the size of the output picture
    stream.Close();
}

mc 5,426 Reputation points

2021-07-08T07:53:53.777+00:00

thank you.
but Android.OS.Environment.ExternalStorageDirectory is also deprecated.

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