CODEWITHSUNDEEP
javaandroidscreen
lisovaccaro
lisovaccaro

Reputation: 33996

Get screen dimensions inside page adapter?

I'm trying to get screen dimensions inside page adapter. I could get it inside MainActivity and pass it to the adapter but it would be better to get it there. How can I do it, either directly inside the adapter or inside instantiateItem?

This is my code:

public class MyPagerAdapter extends PagerAdapter {
    Display display = getWindowManager().getDefaultDisplay(); // The method getWindowManager() is undefined for the type MyPagerAdapter
    display.getSize(size);
    ...
    }

Upvotes: 3

Views: 13549

Answers (4)

Null Pointer Exception
Null Pointer Exception

Reputation: 1583

you can Do this with WindowManager

WindowManager wm = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();

Upvotes: 0

Aida Drogan
Aida Drogan

Reputation: 159

public class MyPagerAdapter extends PagerAdapter {
    DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();
    int pxWidth = displayMetrics.widthPixels;
    float dpWidth = pxWidth / displayMetrics.density;
    int pxHeight = displayMetrics.heightPixels;
    float dpHeight = pxHeight / displayMetrics.density;
}

Upvotes: 3

Olaf Dietsche
Olaf Dietsche

Reputation: 74098

You're almost there. You already have a context. With that you can retrieve a WindowManager via getSystemService(WINDOW_SERVICE)

WindowManager wm = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();

Upvotes: 15

syklon
syklon

Reputation: 188

From any context reference (such as in your intantiateItem), you can get a reference to the DisplayMetrics class by doing

context.getResources().getDisplayMetrics()

Which gives you a reference to the DisplayMetrics class DisplayMetrics

Particularly of use to you will be the widthPixels and heightPixels attributes of this, which return the raw pixel height and width for the device.

Upvotes: 12

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