在相机胶卷中保存png

Question

Is it possible to save images in camera roll as .PNG file ?

As far as I understand when we are using Mediastore class all files are saving as JPEG format.

The problem came when downloading transparent file and saved it to camera roll which is transparent png file and in camera roll it shows black jpeg.

Answer 1

I think you can do that in a second step with Bitmap.compress

boolean compress(Bitmap.CompressFormat format, int quality, OutputStream stream)

By passing an output stream for example a FileOutputStream:

FileOutputStream out = new FileOutputStream(filename);
bmp.compress(Bitmap.CompressFormat.PNG, your_quality_from_1_to_100, out);

and then

MediaStore.Images.Media.insertImage(context.getContentResolver(), absoluteFilepath, fileName, fileDescription);

For more information give a look to https://developer.android.com/reference/android/graphics/Bitmap.html