How to get screen dimensions in pixels in Android app?

This example demonstrates how do I get screen dimensions in pixels in android.

Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.

Step 2 − Add the following code to res/layout/activity_main.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" >
   <TextView
      android:id="@+id/textView2"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_below="@+id/textView1"
      android:layout_centerHorizontal="true"
      android:layout_marginTop="16dp"
      android:text="Large Text"
      android:textAppearance="?android:attr/textAppearanceLarge" />
   <TextView
      android:id="@+id/textView1"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignParentTop="true"
      android:layout_centerHorizontal="true"
      android:layout_marginTop="176dp"
      android:text="Width in Pixels: "
      android:textAppearance="?android:attr/textAppearanceLarge" />
   <TextView
      android:id="@+id/textView3"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignRight="@+id/textView1"
      android:layout_below="@+id/textView2"
      android:layout_marginTop="24dp"
      android:text="Height in Pixels: "
      android:textAppearance="?android:attr/textAppearanceLarge" />
   <TextView
      android:id="@+id/textView4"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignLeft="@+id/textView2"
      android:layout_below="@+id/textView3"
      android:layout_marginTop="16dp"
      android:text="Large Text"
      android:textAppearance="?android:attr/textAppearanceLarge" />
</RelativeLayout>

Step 3 − Add the following code to src/MainActivity.java

import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.WindowManager;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
   TextView one,two;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      one = (TextView)findViewById(R.id.textView2);
      two = (TextView)findViewById(R.id.textView4);
      DisplayMetrics displayMetrics = new DisplayMetrics();
      WindowManager windowmanager = (WindowManager)getApplicationContext().getSystemService(Context.WINDOW_SERVICE);
      windowmanager.getDefaultDisplay().getMetrics(displayMetrics);
      int deviceWidth = displayMetrics.widthPixels;
      int deviceHeight = displayMetrics.heightPixels;
      one.setText(String.valueOf(deviceWidth));
      two.setText(String.valueOf(deviceHeight));
   }
}

Step 4 − Add the following code to androidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.sample">
   <application
      android:allowBackup="true"
      android:icon="@mipmap/ic_launcher"
      android:label="@string/app_name"
      android:roundIcon="@mipmap/ic_launcher_round"
      android:supportsRtl="true"
      android:theme="@style/AppTheme">
      <activity android:name=".MainActivity">
         <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>
      </activity>
   </application>
</manifest>

Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click Run  icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −

Click here to download the project code.

Azhar

Published on 02-Aug-2019 10:13:06