Convert Pixel value into dp value

Question

I am able to find the screen width using getWindowManager().getDefaultDisplay(). Now I want to know how can I get value in dp from the value that I got which is in pixel. For example, suppose I got a width of the screen using this code:

Display display = getWindowManager().getDefaultDisplay();
int width = display.getWidth();

Now the width I got is in pixel, how do I convert it into dp.

Please help me to solve this out. I have seen in the android documentation but don't get to know how to implement it.

possible duplicate of [converting pixels to dp in android](http://stackoverflow.com/questions/4605527/converting-pixels-to-dp-in-android) — Paresh Mayani, Apr 26 '12 at 11:04
@PareshMayani I have used the following formula for getting dp values from pixels. Can u please check it whether the formula is right or not int widthDPI = (int) (screenWidthPx / (logicalDensity + 0.5)); — AndroidDev, Apr 26 '12 at 11:48

ρяσѕρєя K · Accepted Answer · 2012-04-26T11:14:19.480

2

If you want to convert dp values to pixels u can use following formula:

DisplayMetrics metrics = getWindowManager().getDefaultDisplay().getMetrics(metrics);
float logicalDensity = metrics.density;
int px = (int) (dp * logicalDensity + 0.5);

To get dp from pixels, divide the density into the pixel value rather than multiply.

edited Apr 26 '12 at 11:14

answered Apr 26 '12 at 11:09

ρяσѕρєя K

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Actually in my case i want to convert pixel value to dp. And here how can i find the logicalDensity – AndroidDev Apr 26 '12 at 11:12
then divide density by pixel value – ρяσѕρєя K Apr 26 '12 at 11:15
Ok for correction i want to ask u...is this the right way to do for converting pixel value in dp int dp = (int) (width / (logicalDensity + 0.5)); Actually my width is 240 px and in result i got 192 dp is it right. – AndroidDev Apr 26 '12 at 11:17
Imran, Why there should be + 0.5 – Pavankumar Vijapur Apr 26 '12 at 11:21
@PavankumarVijapur then what will be the syntax. – AndroidDev Apr 26 '12 at 11:22
What is the `metrics` variable here: `.getMetrics(` **metrics** `)`? I am getting `Illegal self reference` in Android Studio – tallpaul Jul 02 '15 at 14:39

score 2 · Answer 2 · answered May 12 '12 at 11:34

For example: create new dimens.xml in your res/values folder:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <dimen name="dim_5dp">5dp</dimen>
</resources>

Then in your activity:

int pixels = getResources().getDimensionPixelSize(R.dimen.dim_5dp);

The benefit is getDimensionPixelSize() takes care of zero-size, it returns at least 1 pixel in that case.

score 1 · Answer 3 · answered Apr 26 '12 at 11:12

1

you need to use pixel density of your screen to convert between actual pixels and dp. This is described in Android developer portal/guide here. Take a look

answered Apr 26 '12 at 11:12

binW

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score 0 · Answer 4 · answered Dec 02 '17 at 06:54

0

The shortest way is to use TypedValue.

  public static float pxToDp(Context context, float pixel) {
            return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_PX, pixel, context.getResources().getDisplayMetrics());
  }

answered Dec 02 '17 at 06:54

Rasoul Miri

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Convert Pixel value into dp value

4 Answers4