How to get the width and height of the screen

Question

I tried using the following code to get the width and height of the screen in Android app development:

Display display = getWindowManager().getDefaultDisplay(); int screenWidth = display.getWidth(); int screenHeight = display.getHeight(); 

but I got a NullPointerException for my display , why? How to get the width and height of the screen?

Answer 1

If you call this outside the scope of the action, you need to pass the context (or get it through some other call). Then use this to get display metrics:

 DisplayMetrics metrics = context.getResources().getDisplayMetrics(); int width = metrics.widthPixels; int height = metrics.heightPixels; 

UPDATE: with API level 17+ you can use getRealSize :

 Point displaySize = new Point(); activity.getWindowManager().getDefaultDisplay().getRealSize(displaySize); 

If you want to get an available window size, you can use getDecorView to calculate the available area by subtracting the size of the decor view from the actual display size:

 Point displaySize = new Point(); activity.getWindowManager().getDefaultDisplay().getRealSize(displaySize); Rect windowSize = new Rect(); ctivity.getWindow().getDecorView().getWindowVisibleDisplayFrame(windowSize); int width = displaySize.x - Math.abs(windowSize.width()); int height = displaySize.y - Math.abs(windowSize.height()); return new Point(width, height); 

getRealMetrics can also work (requires API level 17+), but I have not tried it yet:

 DisplayMetrics metrics = new DisplayMetrics(); activity.GetWindowManager().getDefaultDisplay().getRealMetrics(metrics); 

Answer 2

As part of the action, you can call:

 int width = this.getResources().getDisplayMetrics().widthPixels; int height = this.getResources().getDisplayMetrics().heightPixels; 

When you are in a view, you need to get the context first:

 int width = getApplicationContext().getResources().getDisplayMetrics().widthPixels; int height = getApplicationContext().getResources().getDisplayMetrics().heightPixels; 

This will work on all versions of Android available with API 1, and will never expire.

Answer 3

From service:

 Display display= ((WindowManager) getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay(); int width = display.getWidth(); int height = display.getHeight(); 

Answer 4

Here is what finally helped me:

 DisplayMetrics metrics = this.getResources().getDisplayMetrics(); int width = metrics.widthPixels; int height = metrics.heightPixels; 

Answer 5

Try using context.getResources().getDisplayMetrics() if you have context.

Answer 6

 DisplayMetrics metrics = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(metrics); int height = metrics.heightPixels; int width = metrics.widthPixels; 

I think the code you wrote is out of date.

Answer 7

 if (Build.VERSION.SDK_INT >= 11) { Point size = new Point(); try { this.getWindowManager().getDefaultDisplay().getRealSize(size); screenWidth = size.x; screenHeight = size.y; } catch (NoSuchMethodError e) { screenHeight = this.getWindowManager().getDefaultDisplay().getHeight(); screenWidth=this.getWindowManager().getDefaultDisplay().getWidth(); } } else { DisplayMetrics metrics = new DisplayMetrics(); this.getWindowManager().getDefaultDisplay().getMetrics(metrics); screenWidth = metrics.widthPixels; screenHeight = metrics.heightPixels; } 

Answer 8

Try using the following code to get the width and height of the screen.

 int widthOfscreen =0; int heightOfScreen = 0; DisplayMetrics dm = new DisplayMetrics(); try { ((Activity) context).getWindowManager().getDefaultDisplay() .getMetrics(dm); } catch (Exception ex) { } widthOfscreen = dm.widthPixels; heightOfScreen = dm.heightPixels; 

Answer 9

 WindowManager w = getWindowManager(); Display d = w.getDefaultDisplay(); DisplayMetrics metrics = new DisplayMetrics(); d.getMetrics(metrics); Log.d("WIDTH: ", String.valueOf(d.getWidth())); Log.d("HEIGHT: ", String.valueOf(d.getHeight())); 

Answer 10

  /* *DisplayMetrics: A structure describing general information about a display, such as its size, density, and font scaling. * */ DisplayMetrics metrics = getResources().getDisplayMetrics(); int DeviceTotalWidth = metrics.widthPixels; int DeviceTotalHeight = metrics.heightPixels; 

Answer 11

  int scrWidth = getWindowManager().getDefaultDisplay().getWidth(); int scrHeight = getWindowManager().getDefaultDisplay().getHeight(); 

Answer 12

 Display display = getActivity().getWindowManager().getDefaultDisplay(); int screenWidth = display.getWidth(); int screenHeight = display.getHeight(); Log.d("Tag", "Getting Width >> " + screenWidth); Log.d("Tag", "Getting Height >> " + screenHeight); 

This worked correctly in my application

Answer 13

Alternative way to use the function

 private int[] getScreenSIze(){ DisplayMetrics displaymetrics = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(displaymetrics); int h = displaymetrics.heightPixels; int w = displaymetrics.widthPixels; int[] size={w,h}; return size; } 

when you click or in your create function add the following code

 int[] screenSize= getScreenSIze(); int width=screenSize[0]; int height=screenSize[1]; screenSizes.setText("Phone Screen sizes \n\n width = "+width+" \n Height = "+height); 

See demo source code