Generate QR Code using Java (Android)

ZXing Android Embedded library

  1. Add zxing-android-embedded dependency in the module's build.gradle file:

app/build.gradle

dependencies { implementation 'com.journeyapps:zxing-android-embedded:4.3.0' }
  1. Add ImageView element in the layout XML file:

app/src/main/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"> <ImageView android:id="@+id/myImageView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:contentDescription="QR Code" /> </RelativeLayout>
  1. Generate QR code:

app/src/main/java/com/example/app/MainActivity.java

package com.example.app; import androidx.appcompat.app.AppCompatActivity; import android.graphics.Bitmap; import android.os.Bundle; import android.widget.ImageView; import com.google.zxing.BarcodeFormat; import com.journeyapps.barcodescanner.BarcodeEncoder; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); String text = "Hello"; try { BarcodeEncoder encoder = new BarcodeEncoder(); Bitmap bitmap = encoder.encodeBitmap(text, BarcodeFormat.QR_CODE, 400, 400); ImageView imageView = findViewById(R.id.myImageView); imageView.setImageBitmap(bitmap); } catch(Exception e) { e.printStackTrace(); } } }

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