How to get android device screen size?

Question

I have two android device with same resolution

Device1 -> resolution 480x800 diagonal screen size -> 4.7 inches

Device2 -> resolution 480x800 diagonal screen size -> 4.0 inches

How to find device diagonal screen size?

Detect 7 inch and 10 inch tablet programmatically

I have used the above link but it gives both device diagonal screen size -> 5.8

I want to find programatically diagonal screen size to find which device is — Kailas, Oct 03 '13 at 09:44
The code you have tried is the right code as you are getting the diagonal screen size. — GrIsHu, Oct 03 '13 at 09:51
But it gives same diagonal screen size for both the device. Is any other way to calculate diagonal screen size? — Kailas, Oct 03 '13 at 09:56

score 88 · Accepted Answer · edited Feb 10 '17 at 07:37

88

try this code to get screen size in inch

DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
int width=dm.widthPixels;
int height=dm.heightPixels;
double wi=(double)width/(double)dm.xdpi;
double hi=(double)height/(double)dm.ydpi;
double x = Math.pow(wi,2);
double y = Math.pow(hi,2);
double screenInches = Math.sqrt(x+y);

edited Feb 10 '17 at 07:37

Kishan Vaghela

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answered Oct 03 '13 at 10:04

Ali Ahmad

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Not getting exact location. if screen size 5.00 inches then get 4.338 value – Vrajesh Sep 23 '15 at 15:01
9

`double wi=(double)width/dm.xdpi; double hi=(double)height/dm.ydpi;` is more accurate. According to the docs for DensityMetrics, it gives the exact density, while `dm.densityDpi` can only give certain discrete values. I've verified it working on two devices. – Matthew Grivich Nov 03 '15 at 01:22
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it doesn't accurate. it returns 4.3" for my 4.7" phone – Shayan_Aryan Dec 22 '15 at 14:51
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If you're getting weird answers (or more importantly your images come out weird because you are using the size to scale stuff), don't forget to use scaledDensity. See my answer below. – Moe Singh Jan 05 '17 at 21:43
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For SDK 17& above refer https://stackoverflow.com/a/55337830/6503228 for accurate screensize – devgun Mar 25 '19 at 12:31
Returns 5.7" for Google Pixel 2 XL when it is really 6" – Johann Aug 11 '21 at 12:14

score 12 · Answer 2 · answered Oct 03 '13 at 09:51

12

This won't work?

DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
double x = Math.pow(dm.widthPixels / dm.xdpi, 2);
double y = Math.pow(dm.heightPixels / dm.ydpi, 2);
double screenInches = Math.sqrt(x + y);
Log.d("debug", "Screen inches : " + screenInches);

answered Oct 03 '13 at 09:51

Smartis has left SO again

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Nice copy paste :) Similar answer http://stackoverflow.com/questions/6589101/how-to-get-screen-size-of-device – GrIsHu Oct 03 '13 at 09:51
You can post as comment also. – GrIsHu Oct 03 '13 at 09:53
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Funny, i copy from http://stackoverflow.com/questions/18106854/how-does-android-choose-which-small-normal-large-resource-folder?rq=1 – Smartis has left SO again Oct 03 '13 at 09:55

score 8 · Answer 3 · edited May 23 '17 at 11:54

8

Don't forget to multiply the screen size by the scaledDensity if you are doing what I did and change the size of stuff based on the screen size. e.g.:

DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
double x = Math.pow(dm.widthPixels / dm.xdpi, 2);
double y = Math.pow(dm.heightPixels / dm.ydpi, 2);
double screenInches = Math.sqrt(x + y) * dm.scaledDensity;
Log.d("debug", "Screen inches : " + screenInches);

Note the second last line! Here's more info the scaledDensity stuff: What does DisplayMetrics.scaledDensity actually return in Android?

edited May 23 '17 at 11:54

Community

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answered Jan 05 '17 at 21:42

Moe Singh

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The accepted answer to the question you linked also mentioned using `getResources().getDisplayMetrics();` to get the correct scaledDensity value. – jk7 Jul 26 '17 at 15:19
* dm.scaledDensity saved my day. Thanks. – masgar Feb 01 '18 at 16:45

score 7 · Answer 4 · answered Mar 25 '19 at 12:30

None of the above answers gave correct screen size... But the below method does it right.

private String getScreenSize() {
    Point point = new Point();
    ((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay().getRealSize(point);
    DisplayMetrics displayMetrics = getResources().getDisplayMetrics();
    int width=point.x;
    int height=point.y;
    double wi=(double)width/(double)displayMetrics.xdpi;
    double hi=(double)height/(double)displayMetrics.ydpi;
    double x = Math.pow(wi,2);
    double y = Math.pow(hi,2);
    return String.valueOf(Math.round((Math.sqrt(x+y)) * 10.0) / 10.0);
}

Note: This works only on API 17 & above.

I have a 1.5 inch watch and this method returns 5.5 – Sergey Mar 05 '23 at 21:34 — Sergey, Mar 05 '23 at 21:34

score 5 · Answer 5 · edited Oct 03 '13 at 09:45

5

Try this:

 public static Boolean isTablet(Context context) {

    if ((context.getResources().getConfiguration().screenLayout & 
            Configuration.SCREENLAYOUT_SIZE_MASK) >= Configuration.SCREENLAYOUT_SIZE_LARGE) {

      return true;
  }
    return false;
}

edited Oct 03 '13 at 09:45

GrIsHu

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answered Oct 03 '13 at 09:43

Niveditha

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score 4 · Answer 6 · answered Oct 03 '13 at 10:00

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DisplayMetrics displayMetrics = context.getResources()
                    .getDisplayMetrics();

String screenWidthInPix = displayMetrics.widthPixels;

String screenheightInPix = displayMetrics.heightPixels;

answered Oct 03 '13 at 10:00

Nikhil Moharkar

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This is a bad method. Thre resources return an inaccurate dpi and resolution. – grebulon Oct 01 '14 at 12:52

score 4 · Answer 7 · answered Oct 03 '13 at 10:01

4

Pythagoras theorem to find the diagonal size of Android phone/tablet screen, same principal can be applied to iPhone or Blackberry screen.

Try as below the other way:

  DisplayMetrics met = new DisplayMetrics();                
  this.getWindowManager().getDefaultDisplay().getMetrics(met);// get display metrics object
  String strSize = 
  new DecimalFormat("##.##").format(Math.sqrt(((met.widthPixels / met.xdpi) *
  (met.widthPixels / met.xdpi)) +
  ((met.heightPixels / met.ydpi) * (met.heightPixels / met.ydpi))));
  // using Dots per inches with width and height

answered Oct 03 '13 at 10:01

GrIsHu

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this.getWindowManager() this gives me error. how can get this. i can get diaplay matrics by these view.getContext().getResources().getDisplayMetrics(); – Kailas Oct 03 '13 at 10:30
The method getWindowManager() is undefined for the type homeFragment – Kailas Oct 03 '13 at 11:18
I write these way. Is any thing wrong in it b'coz it gives me wrong diagonal screen size. DisplayMetrics met = view.getContext().getResources().getDisplayMetrics();// get display metrics object String strSize = new DecimalFormat("##.##").format(Math.sqrt(((met.widthPixels / met.xdpi) * (met.widthPixels / met.xdpi)) + ((met.heightPixels / met.ydpi) * (met.heightPixels / met.ydpi)))); Log.d("Sreen Inches0", "Inches0:"+strSize); – Kailas Oct 03 '13 at 11:21
The method `getWindowManager()` needs instance of activity so you have to write `Activity.getWindowManager()`. – GrIsHu Oct 03 '13 at 11:22

How to get android device screen size?

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