How to resize a bitmap eficiently and with out losing quality in android

Question

I have a Bitmap with a size of 320x480 and I need to stretch it on different device screens, I tried using this:

Rect dstRect = new Rect();
canvas.getClipBounds(dstRect);
canvas.drawBitmap(frameBuffer, null, dstRect, null);

it works, the image fills the whole screen like I wanted but the image is pixelated and it looks bad. Then I tried :

float scaleWidth = (float) newWidth / width;
float scaleHeight = (float) newHeight / height;
Matrix matrix = new Matrix();
matrix.postScale(scaleWidth, scaleHeight);
Bitmap resizedBitmap = Bitmap.createBitmap(frameBuffer, 0, 0,
                width, height, matrix, true);
canvas.drawBitmap(resizedBitmap, 0, 0, null);

this time it looks perfect, nice and smooth, but this code has to be in my main game loop and creating Bitmaps every iteration makes it very slow. How can I resize my image so it doesn't get pixelated and gets done fast?

FOUND THE SOLUTION:

Paint paint = new Paint();
paint.setFilterBitmap();
canvas.drawBitmap(bitmap, matrix, paint);

Answer 1

Resizing a Bitmap:

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;
}

Pretty self explanatory: simply input the original Bitmap object and the desired dimensions of the Bitmap, and this method will return to you the newly resized Bitmap! May be, it is useful for you.