Facing Image Uploading and retrieving difficulties to Datastore in android?

Question

I have searched but for some answers but may be my fault couldn't find my desired answer.Now below what i am trying:
I am trying to upload an image like of a status or a post or any profile pic.Profile pic will be small and status or any post image will be big. Now what i want to do:

1. I am converting the image to string text and uploading it to datastore and it's limit is 1Mbyte.So i want to check while uploading image that it doesn't cross limit.

2. I want to check that the image is of png format.If it is not then won't upload.Show a Toast.Can i convert image there?? :(

3. If user is uploading image of suppose 700kbyte but the profile pic is small i.e 100kbyte will be enough for profile pic then i can compress the pic to my defined size and then upload it to datastore.It may remain 700kbyte if it is for status image.

I am converting image to string and uploading it to datastore and again converting back to image while showing it in my app.My code:

public static String imageToStringConverter(Bitmap image){
    ByteArrayOutputStream stream = new ByteArrayOutputStream();
    image.compress(Bitmap.CompressFormat.PNG, 100, stream);
    byte[] byteArray = stream.toByteArray();
    String imageToString = Base64.encodeToString(byteArray, Base64.NO_WRAP);

    return imageToString;
}

public static Bitmap stringToimageConverter(String imageString){
    byte[] stringTobyte = Base64.decode(imageString, Base64.NO_WRAP);
    Bitmap bmp = BitmapFactory.decodeByteArray(stringTobyte, 0, stringTobyte.length);
    return bmp;
}

Now the problem i am facing :

1.When i am uploading the image it is taking time.So should i use asynctask while uploading after converting the image to my desired size??

2.When i first enter into my app ,i have shown profile pic i.e if i log into my account it will fetch an image for profile from datastore.But it is taking much time and my log in seems to be lengthy.

save only URLS for images in the datastore, and generate those URLS with get_serving_url. https://cloud.google.com/appengine/docs/python/images/functions Then images will be served from Google's image serving infrastructure rather then your app. — Paul Collingwood, Mar 05 '15 at 16:00
you can do whatever you want before uploading, it's your app! You can also serve the image at a specific size from the serving_url, check the documentation. — Paul Collingwood, Mar 05 '15 at 16:53

score 1 · Accepted Answer · answered Mar 07 '15 at 09:31

I have solved my problem by reducing the image. Here is my code:

public void onActivityResult(int requestCode, int resultCode, Intent imageReturnedIntent) {
        super.onActivityResult(requestCode, resultCode, imageReturnedIntent);

        switch (requestCode) {

            case SELECT_PHOTO:
                Uri imageUri;
                try {
                     imageUri = imageReturnedIntent.getData();
                }catch(Exception e){
                    Toast.makeText(getActivity(),"Image Not Found",Toast.LENGTH_SHORT).show();
                    return;
                }
                //final InputStream imageStream = getActivity().getContentResolver().openInputStream(imageUri);
                //final Bitmap selectedImage = BitmapFactory.decodeStream(imageStream);
                ShrinkBitmapConverter sh = new ShrinkBitmapConverter(getActivity());
                Bitmap selectedImage = null;
                try {
                    selectedImage = sh.shrinkBitmap(imageUri,450,350);
                } catch (Exception e) {
                    Toast.makeText(getActivity(),"Image Not Found",Toast.LENGTH_SHORT).show();
                }
                statusImage = ImageConverter.imageToStringConverter(selectedImage);
                if(statusImage.length()>512000){
                    Toast.makeText(getActivity(),"Image is too big",Toast.LENGTH_LONG).show();
                }else {
                    postImage.setImageBitmap(selectedImage);
                }
        }
    }

ImageConverter.java:

public class ImageConverter {

    public static String imageToStringConverter(Bitmap image){
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        image.compress(Bitmap.CompressFormat.PNG, 100, stream);
        byte[] byteArray = stream.toByteArray();
        String imageToString = Base64.encodeToString(byteArray, Base64.NO_WRAP);
        return imageToString;
    }

    public static Bitmap stringToimageConverter(String imageString){
        byte[] stringTobyte = Base64.decode(imageString, Base64.NO_WRAP);
        Bitmap bmp = BitmapFactory.decodeByteArray(stringTobyte, 0, stringTobyte.length);
        return bmp;
    }

}

ShrinkBitmapConverter.java:

public class ShrinkBitmapConverter {
    Context context;
    public ShrinkBitmapConverter(Context c){
        context=c;
    }

    public Bitmap shrinkBitmap(Uri uri,int width,int height) throws FileNotFoundException {

        BitmapFactory.Options bmpFactoryOptions = new BitmapFactory.Options();
        bmpFactoryOptions.inJustDecodeBounds = true;

        Bitmap bitmap = null;;
        try {
            bitmap = BitmapFactory.decodeStream(context.getContentResolver().openInputStream(uri),null,bmpFactoryOptions);

            int heightRatio = (int)Math.ceil(bmpFactoryOptions.outHeight/(float)height);
            int widthRatio = (int)Math.ceil(bmpFactoryOptions.outWidth/(float)width);

            if (heightRatio > 1 || widthRatio > 1)
            {
                if (heightRatio > widthRatio)
                {
                    bmpFactoryOptions.inSampleSize = heightRatio;
                } else {
                    bmpFactoryOptions.inSampleSize = widthRatio;
                }
            }

            bmpFactoryOptions.inJustDecodeBounds = false;
            bitmap = BitmapFactory.decodeStream(context.getContentResolver().openInputStream(uri),null,bmpFactoryOptions);

        } catch (Exception e) {

            Toast.makeText(context,"Image Not Found",Toast.LENGTH_SHORT).show();
        }

        return bitmap;
    }
}

Facing Image Uploading and retrieving difficulties to Datastore in android?

1 Answers1