Android – Get Screen Width and Height

In Android, WindowManager is available to every Activity. Through WindowManager, we can get the metrics of default display in which the activity is being shown.

In this tutorial, we will learn how to get width and height of the screen, on which the application is running, with the help of example Android Application.

Steps to Get Width and Height of Screen

To get Android screen width and height programmatically, follow these steps.

  1. Create a DispalyMetrics() object.
  2. Pass the displayMetrics object to getMetrics() method of Display class. WindowManager.defaultDisplay() returns the Display object.
  3. Screen Width could be obtained using displayMetrics.widthPixels
  4. Screen Height could be obtained using displayMetrics.heightPixels

In the following screenshot, width and height of the Android device screen is obtained programmatically and displayed using TextView.

Android Get Screen Dimensions Width and Height programatically

Code – Get Width and Height

A quick snippet of the code to obtain screen dimensions programmatically is provided below

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val displayMetrics = DisplayMetrics()
windowManager.defaultDisplay.getMetrics(displayMetrics)

var width = displayMetrics.widthPixels
var height = displayMetrics.heightPixels

Example – Kotlin Android – Get Screen Dimensions Programmatically

In the following example, we shall obtain screen width and height, display it in the Activity with the help of TextView.

activity_main.xml

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<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textV"
        android:textSize="30px"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</android.support.constraint.ConstraintLayout>

MainActivity.kt

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package com.tutorialkart.drawshapeoncanvas

import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import kotlinx.android.synthetic.main.activity_main.*
import android.util.DisplayMetrics


class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // get device dimensions
        val displayMetrics = DisplayMetrics()
        windowManager.defaultDisplay.getMetrics(displayMetrics)

        var width = displayMetrics.widthPixels
        var height = displayMetrics.heightPixels

        textV.text = width.toString() + " x " +height.toString()
    }
}

Conclusion

In this Kotlin Android Tutorial – Get Screen Dimensions Programmatically, we have learnt to get screen width and height programmatically using DisplayMetrics.