从图库上传图像并在 AlertDialog 中显示

Question

I'm trying to display an image uploaded from the gallery in an AlertDialog but it's not working for me right now.

My code:

private void dispatchTakePictureIntent() {
        Intent imageGetter = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        activityLauncher.launch(imageGetter);
    }

ActivityResultLauncher<Intent> activityLauncher = registerForActivityResult( new ActivityResultContracts.StartActivityForResult(), result -> {
        Uri selectedImage = result.getData().getData();
        String[] filePathColumn = {MediaStore.Images.Media.DATA};//Array size of 1, and we put in a string
        Cursor cursor = getContext().getContentResolver().query(selectedImage, filePathColumn, null, null, null);
        cursor.moveToFirst();
        int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
        String user_image_path = cursor.getString(columnIndex);
        myImageView = new ImageView(getContext());
        Picasso.get().load(user_image_path).fit().centerCrop().into(myImageView);
        AlertDialog.Builder builder =
                new AlertDialog.Builder(getContext()).
                        setMessage("Message above the image").
                        setPositiveButton("OK", (dialog, which) -> dialog.dismiss()).
                        setView(myImageView);
        builder.create().show();
        cursor.close();
    });

The gallery opens up and I can choose a picture but after I choose a picture it goes back and a blank dialog with no image (the message is there) shows up.

I tried adding "file:/// " to the Picasso but that doesn't work.

Thanks.

Answer 1

Why not use the Uri directly to display the picture? Just like:

Uri selectedImage = result.getData().getData();
Picasso.get().load(selectedImage).fit().centerCrop().into(myImageView);

At the same time, it is worth noting that

resolver.query()

is a I/O operation. It is not recommended to operate directly on the main thread