resize image from file

Question

I am uploading an image to a server and before that happens, I would like to resize the image dimensions. I get the image with a URI like this:

Constants.currImageURI = data.getData();

this is the call to upload the image:

String response = uploadUserPhoto(new File(getRealPathFromURI(Constants.currImageURI)));

    public String uploadUserPhoto(File image) {

    DefaultHttpClient mHttpClient;
    HttpParams params = new BasicHttpParams();
    params.setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);
    mHttpClient = new DefaultHttpClient(params);

    try {
        HttpPost httppost = new HttpPost("http://myurl/mobile/image");

        MultipartEntity multipartEntity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);  
        multipartEntity.addPart("userID", new StringBody(Constants.userID));
        multipartEntity.addPart("uniqueMobileID", new StringBody(Constants.uniqueMobileID));
        multipartEntity.addPart("userfile", new FileBody(image, "mobileimage.jpg", "image/jpeg", "UTF-8"));
        httppost.setEntity(multipartEntity);

        HttpResponse response = mHttpClient.execute(httppost);
        String responseBody = EntityUtils.toString(response.getEntity());

        Log.d(TAG, "response: " + responseBody);
        return responseBody;

    } catch (Exception e) {
       Log.d(TAG, e.getMessage());
    }
    return "";
}

Is there a way to resize the file based on pixel dimensions?

Thanks.

Answer 1

See what Google recommends doing (as @Pointer Null advised):

public int calculateInSampleSize(
            BitmapFactory.Options options, int reqWidth, int reqHeight) {
    // Raw height and width of image
    final int height = options.outHeight;
    final int width = options.outWidth;
    int inSampleSize = 1;

    if (height > reqHeight || width > reqWidth) {

        final int halfHeight = height / 2;
        final int halfWidth = width / 2;

        // Calculate the largest inSampleSize value that is a power of 2 and keeps both
        // height and width larger than the requested height and width.
        while ((halfHeight / inSampleSize) > reqHeight
                && (halfWidth / inSampleSize) > reqWidth) {
            inSampleSize *= 2;
        }
    }

    return inSampleSize;
}

I call the above to resize a large image:

// Check if source and destination exist
// Check if we have read/write permissions

int desired_width = 200;
int desired_height = 200;

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

BitmapFactory.decodeFile(SOME_PATH_TO_LARGE_IMAGE, options);

options.inSampleSize = calculateInSampleSize(options, desired_width, desired_height);
options.inJustDecodeBounds = false;

Bitmap smaller_bm = BitmapFactory.decodeFile(src_path, options);

FileOutputStream fOut;
try {
    File small_picture = new File(SOME_PATH_STRING);
    fOut = new FileOutputStream(small_picture);
    // 0 = small/low quality, 100 = large/high quality
    smaller_bm.compress(Bitmap.CompressFormat.JPEG, 50, fOut);
    fOut.flush();
    fOut.close();
    smaller_bm.recycle();
} catch (Exception e) {
    Log.e(LOG_TAG, "Failed to save/resize image due to: " + e.toString());
}

Answer 2

This is taken from ThinkAndroid at this url: http://thinkandroid.wordpress.com/2009/12/25/resizing-a-bitmap/

I would look into the possibility of creating a Bitmap or Drawable from the resource and if you want to change it's size use the code below.

public Bitmap getResizedBitmap(Bitmap bm, int newHeight, int newWidth) {
    int width = bm.getWidth();
    int height = bm.getHeight();
    float scaleWidth = ((float) newWidth) / width;
    float scaleHeight = ((float) newHeight) / height;

    // Create a matrix for the manipulation
    Matrix matrix = new Matrix();

    // Resize the bit map
    matrix.postScale(scaleWidth, scaleHeight);

    // Recreate the new Bitmap
    Bitmap resizedBitmap = Bitmap.createBitmap(bm, 0, 0, width, height, matrix, false);
    return resizedBitmap;

}

EDIT: As suggested in other comment Bitmap.createScaledBitmap should be used for better quality when resizing.