Android Development: Scale to fit different devices

Question

Im making a game and using surfaceview. I load bitmaps that represent character and background and so on.

But HOW do I properly scale it to fit large devices and small devices and other devices?

//Simon

NOTE* dpi wont work, only pixels work whhen using canvas

score 1 · Accepted Answer · edited May 23 '17 at 12:26

You can implement a helper method that you can use to request calculations based on the device's dpi.

Based on @MitulNakum answer from this qustion, do this:

//note that mdpi is the standard
float getAdjustedDimension(float value){
    DisplayMetrics metrics = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics(metrics);
    switch(metrics.densityDpi){
         case DisplayMetrics.DENSITY_LOW:
              //api 4 and higher
              return 0.75 * value;
         case DisplayMetrics.DENSITY_MEDIUM:
              //api 4 and higher
              return value;
         case DisplayMetrics.DENSITY_HIGH:
              //api 4 and higher
              return value * 1.25;
         case DisplayMetrics.DENSITY_XHIGH
              //api 9 and higher
              return value * 2;
         case DisplayMetrics.DENSITY_TV
              //api 13 and higher
              return value * 1.33125;
    }
}

Two important points, you should probably cache metrics.densityDpi, and this is not very efficient for a game. — Gallal, Aug 01 '11 at 18:37

score 1 · Answer 2 · answered Aug 01 '11 at 19:09

1

Take a look at AndEngine's Cameras. Everything you are looking for can be found there, and it is open source! I have used this engine for a number of games and prototype apps. It is very well documented.

AndEngine.org

Source Code

answered Aug 01 '11 at 19:09

mgidell

21
4

1

Sorry but im not intressted in engines :) – carefacerz Aug 01 '11 at 21:52

score 0 · Answer 3 · answered Aug 01 '11 at 18:14

The android supported way is by creating several images for each bitmap you need for your app of varying sizes and letting the app decide which to use for a given screen density. Those images would go in the drawable-ldpi, drawable-hdpi, etc, folders. Check out the link and read it closly: http://developer.android.com/guide/practices/screens_support.html

Not very memory friendly though. :(

Android Development: Scale to fit different devices

3 Answers3