How To Generate QR Code In Android ?

 In this blog, we will learn how to generate QR codes in Android. Quick Response Code (QR Code in sharp) is a 2-Dimensional pattern type barcode used to store data. It is also popular because of its storage capacity including fast readability.

Step by Step Implementation

Step 1 - Creating a New Project with Android Studio

1. Open Android Studio and select "Create New Project".
2. Name the project as per your wish and select your activity template.
    
    

   

   
   

   
   
3. Click the “Finish” button to create a new project in Android Studio.

Step 2: Add dependency to build.gradle(Module:app)

Navigate to the Gradle Scripts > build.gradle(Module:app) and add the below dependency in the dependencies section.

implementation ‘androidmads.library.qrgenearator:QRGenearator:1.0.3’

Now sync the project from the top right corner option of Sync now. 

Step 3: Working with the activity_main.xml file

Go to the activity_main.xml file and refer to the following code. Below is the code for the activity_main.xml file.

<?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">

  

    <!--We are using this image 

        view to display our QR code-->

    <ImageView

        android:id="@+id/idIVQrcode"

        android:layout_width="300dp"

        android:layout_height="300dp"

        android:layout_centerHorizontal="true"

        android:layout_marginTop="50dp"

        android:contentDescription="@string/qr_code" />

  

    <!--Edit text to enter text 

        for creating a QR code-->

    <EditText

        android:id="@+id/idEdt"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_below="@id/idIVQrcode"

        android:layout_marginStart="20dp"

        android:layout_marginTop="30dp"

        android:layout_marginEnd="20dp"

        android:autofillHints=""

        android:hint="@string/enter_your_info"

        android:inputType="text" />

  

    <!--Button for creating a QR code-->

    <Button

        android:id="@+id/idBtnGenerateQR"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_below="@id/idEdt"

        android:layout_marginStart="20dp"

        android:layout_marginTop="30dp"

        android:layout_marginEnd="20dp"

        android:text="@string/generate_qr_code" />

  

</RelativeLayout>

Step 5: Working with the MainActivity.java file

Go to the MainActivity.java file and refer to the following code. Below is the code for the MainActivity.java file.

import android.graphics.Bitmap;

import android.graphics.Point;

import android.os.Bundle;

import android.text.TextUtils;

import android.util.Log;

import android.view.Display;

import android.view.View;

import android.view.WindowManager;

import android.widget.Button;

import android.widget.EditText;

import android.widget.ImageView;

import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

import com.google.zxing.WriterException;

import androidmads.library.qrgenearator.QRGContents;

import androidmads.library.qrgenearator.QRGEncoder;

  

public class MainActivity extends AppCompatActivity {

  

  

    private ImageView qrCodeIV;

    private EditText dataEdt;

    private Button generateQrBtn;

    Bitmap bitmap;

    QRGEncoder qrgEncoder;

  

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

          

        qrCodeIV = findViewById(R.id.idIVQrcode);

        dataEdt = findViewById(R.id.idEdt);

        generateQrBtn = findViewById(R.id.idBtnGenerateQR);

  

        

        generateQrBtn.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                if (TextUtils.isEmpty(dataEdt.getText().toString())) {

                      

                   

                    Toast.makeText(MainActivity.this, "Enter some text to generate QR Code", Toast.LENGTH_SHORT).show();

                } else {

                    

                    WindowManager manager = (WindowManager) getSystemService(WINDOW_SERVICE);

                      

                    Display display = manager.getDefaultDisplay();

                      

                  

                    Point point = new Point();

                    display.getSize(point);

                      

                    

                    int width = point.x;

                    int height = point.y;

                      

                    int dimen = Math.min(width, height);

                    dimen = dimen * 3 / 4;

                      

                    qrgEncoder = new QRGEncoder(dataEdt.getText().toString(), null, QRGContents.Type.TEXT, dimen);

                    try {

                       

                        bitmap = qrgEncoder.encodeAsBitmap();

                        qrCodeIV.setImageBitmap(bitmap);

                    } catch (WriterException e) {

                        Log.e("Tag", e.toString());

                    }

                }

            }

        });

    }

}

Enjoy Your Coding...