How to Find the Screen Resolution of a Device Programmatically in Android?

Screen Resolution refers to the number of pixels on display. A higher resolution means more pixels and more pixels provide the ability to display more visual information. This entity is widely used in applications related to the broadcasting of real-time visuals such as live video, gaming, etc for optimization and frame conversions. The same information can also be used to detect if there is damage to any of the pixels present on the screen. Practically, it is possible to retrieve this information. A sample GIF is given below to get an idea about what we are going to do in this article.

Step by Step Implementation

Step 1: Create a New Project in Android Studio

To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio. The code for that has been given in both Java and Kotlin Programming Language for Android.

Step 2: Working with the activity_main.xml file

Go to the activity_main.xml file which represents the UI of the application, and create a Button that on click would generate a Toast displaying the number of pixels available at the width and length. Below is the code for the activity_main.xml file.

XML

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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">

    <!--Button which onclick creates a Toast Message-->
    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="click" />
</RelativeLayout>

Step 3: Working with the MainActivity file

Go to the MainActivity file, and refer to the following code. Below is the code for the MainActivity file. Comments are added inside the code to understand the code in more detail.

Kotlin

import android.graphics.Point
import android.os.Bundle
import android.widget.Button
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity

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

        // Declare the button from the layout file
        val btn = findViewById<Button>(R.id.btn)

        // Action when the button is clicked
        btn.setOnClickListener {

            // get default display from the windows manager
            val display = windowManager.defaultDisplay

            // declare and initialize a point
            val size = Point()

            // store the points related details from the display variable in the size variable
            display.getSize(size)

            // store the point information in integer variables width and height
            // where .x extracts width pixels and .y extracts height pixels
            val width = size.x
            val height = size.y

            // Toast will display the width and height values
            Toast.makeText(applicationContext, "Width: $width Pixels , Height: $height Pixels", Toast.LENGTH_LONG).show()
        }
    }
}

Java

import android.graphics.Point;
import android.os.Bundle;
import android.view.Display;
import android.widget.Button;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Declare the button from the layout file
        Button btn = findViewById(R.id.btn);

        // Action when the button is clicked
        btn.setOnClickListener(v -> {
            // get default display from the windows manager
            Display display = getWindowManager().getDefaultDisplay();

            // declare and initialize a point
            Point size = new Point();

            // store the points related details from the display variable in the size variable
            display.getSize(size);

            // store the point information in integer variables width and height
            // where .x extracts width pixels and .y extracts height pixels
            int width = size.x;
            int height = size.y;

            // Toast will display the width and height values
            Toast.makeText(getApplicationContext(), "Width: " + width + " Pixels , Height: " + height + " Pixels", Toast.LENGTH_LONG).show();
        });
    }
}

Output: Run on Emulator