How to convert pixels to DP’s in Android app?

This example demonstrates about How do I convert Pixels to DP’s 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="https://schemas.android.com/apk/res/android"
   xmlns:tools="https://schemas.android.com/tools"
   android:id="@+id/rl"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:padding="10dp"
   tools:context=".MainActivity" >
   <Button
      android:id="@+id/btn"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Convert Pixels to DPs"
      android:layout_centerInParent="true" />
   <TextView
      android:id="@+id/tv"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:fontFamily="Sans-Serif-Condensed"
      android:textSize="14dp"
      android:layout_below="@id/btn"
      android:textStyle="italic"
      android:textColor="#ff0000" />
</RelativeLayout>

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

import android.content.Context;
import android.content.res.Resources;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RelativeLayout;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      final RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);
      final Button btn = (Button) findViewById(R.id.btn);
      final TextView tv = (TextView) findViewById(R.id.tv);
      btn.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
            int pixels_one = 38;
            int pixels_two = 43;
            Context context = getApplicationContext();
            tv.setText("Convert Pixels to integer DPs value: \n"
               + pixels_one+"pixels = " + getDPsFromPixels(context,pixels_one) + "dp\n"
               + pixels_two+"pixels = " +
               getDPsFromPixels(context,pixels_two)+ "\n");
            tv.setText(tv.getText()+ "Convert Pixels to perfect DPs value: \n"
               + pixels_one+ "pixels = "+ getActualDPsFromPixels(context, pixels_one)
               + "dp\n" +pixels_one+ "pixels = "+ getActualDPsFromPixels(context, pixels_one));
         }
      });
   }
   public static int getDPsFromPixels(Context context, int pixels){
      Resources r = context.getResources();
      int dps = Math.round(pixels/(r.getDisplayMetrics().densityDpi/160f));
      return dps;
   }
   public static float getActualDPsFromPixels(Context context, int pixels){
      Resources r = context.getResources();
      float dps = pixels/(r.getDisplayMetrics().densityDpi/160f);
      return dps;
   }
}

Step 4 − Add the following code to androidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="https://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 −