If you wanna scale bitmap for each phone resolution, you should know phone screen size, scale ratio.
This code will return width (w) & height (h) of screen.
DisplayMetrics dMetrics = new DisplayMetrics();
activity.getWindowManager().getDefaultDisplay().getMetrics(dMetrics);
float density = dMetrics.density;
int w = Math.round(dMetrics.widthPixels / density);
int h = Math.round(dMetrics.heightPixels / density);
activity is instance of Activity which would you like to get screen size.
You have to remember that: When your device is in landscape orientation, w > h. When it in portrait orientation w < h.
So from width & height you can detect your device is in what orientation.
Example:
From w & h of device and ratio (which you want to scale) you can calculate new bitmap size to scale it.
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;
}