Generate QR Code Using Zxing Android Studio Programmatically

Generate QR Code Using Zxing Android, kotlin generate qr code

Hello, geeks. Welcome to Generate QR Code Using Zxing Android Studio example tutorial.

You will learn how to generate QR code in Generate QR Code Using Zxing Android Studio example.

You can generate QR Code from any string using ZXing library.

We will also save generated QRCode to internal storage.

First check output then we will develop Generate QR Code Using Zxing Android Studio example.

Download Source Code For Generate QR Code Using Zxing Android Tutorial

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Creating generate create QR Code ZXing Android step by stepStep 1: Create a new project in Android Studio.Step 2: Updating build.gradle(Module:app) file

add following code into dependencies{}

 compile 'com.google.zxing:core:3.2.1'

Step 3: Adding colors in colors.xml

Move to res->values->colors.xml directory and add following

 <color name="black">#000000</color> <color name="white">#ffffff</color>

Step 4: Updating AndroidManifest.xml file

add required permissions between <manifest>….</manifest> tag.

 <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

Note: If you are targeting SDK version above 22 (Above Lollipop) then you need to ask a user for granting runtime permissions. Check marshmallow runtime permission for more information.

Final code for AndroidManifest.xml file

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.exampledemo.parsaniahardik.generate_qr_code">    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />    <application        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        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>

Step 5: Updating activity_main.xml file

Copy and paste below source code in activity_main.xml file

<?xml version="1.0" encoding="utf-8"?><LinearLayout 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"    android:orientation="vertical"    tools:context="com.exampledemo.parsaniahardik.generate_qr_code.MainActivity">    <EditText        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/etqr"        android:layout_marginTop="10dp"        android:layout_marginLeft="5dp"        android:hint="Enter String" />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/btn"        android:text="Create Image"        android:layout_marginTop="10dp"/>    <ImageView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginTop="20dp"        android:id="@+id/iv"/></LinearLayout>

Step 6: Preparing MainActivity.java class

Add following source code in MainActivity.java class

import android.graphics.Bitmap;import android.media.MediaScannerConnection;import android.os.Environment;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.ImageView;import android.widget.Toast;import com.google.zxing.BarcodeFormat;import com.google.zxing.MultiFormatWriter;import com.google.zxing.WriterException;import com.google.zxing.common.BitMatrix;import java.io.ByteArrayOutputStream;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.util.Calendar;public class MainActivity extends AppCompatActivity {    public final static int QRcodeWidth = 500 ;    private static final String IMAGE_DIRECTORY = "/QRcodeDemonuts";    Bitmap bitmap ;    private EditText etqr;    private ImageView iv;    private Button btn;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        iv = (ImageView) findViewById(R.id.iv);        etqr = (EditText) findViewById(R.id.etqr);        btn = (Button) findViewById(R.id.btn);        btn.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                if(etqr.getText().toString().trim().length() == 0){                    Toast.makeText(MainActivity.this, "Enter String!", Toast.LENGTH_SHORT).show();                }else {                    try {                        bitmap = TextToImageEncode(etqr.getText().toString());                        iv.setImageBitmap(bitmap);                        String path = saveImage(bitmap);  //give read write permission                        Toast.makeText(MainActivity.this, "QRCode saved to -> "+path, Toast.LENGTH_SHORT).show();                    } catch (WriterException e) {                        e.printStackTrace();                    }                }            }        });    }    public String saveImage(Bitmap myBitmap) {        ByteArrayOutputStream bytes = new ByteArrayOutputStream();        myBitmap.compress(Bitmap.CompressFormat.JPEG, 90, bytes);        File wallpaperDirectory = new File(                Environment.getExternalStorageDirectory() + IMAGE_DIRECTORY);        // have the object build the directory structure, if needed.        if (!wallpaperDirectory.exists()) {            Log.d("dirrrrrr", "" + wallpaperDirectory.mkdirs());            wallpaperDirectory.mkdirs();        }        try {            File f = new File(wallpaperDirectory, Calendar.getInstance()                    .getTimeInMillis() + ".jpg");            f.createNewFile();   //give read write permission            FileOutputStream fo = new FileOutputStream(f);            fo.write(bytes.toByteArray());            MediaScannerConnection.scanFile(this,                    new String[]{f.getPath()},                    new String[]{"image/jpeg"}, null);            fo.close();            Log.d("TAG", "File Saved::--->" + f.getAbsolutePath());            return f.getAbsolutePath();        } catch (IOException e1) {            e1.printStackTrace();        }        return "";    }    private Bitmap TextToImageEncode(String Value) throws WriterException {        BitMatrix bitMatrix;        try {            bitMatrix = new MultiFormatWriter().encode(                    Value,                    BarcodeFormat.DATA_MATRIX.QR_CODE,                    QRcodeWidth, QRcodeWidth, null            );        } catch (IllegalArgumentException Illegalargumentexception) {            return null;        }        int bitMatrixWidth = bitMatrix.getWidth();        int bitMatrixHeight = bitMatrix.getHeight();        int[] pixels = new int[bitMatrixWidth * bitMatrixHeight];        for (int y = 0; y < bitMatrixHeight; y++) {            int offset = y * bitMatrixWidth;            for (int x = 0; x < bitMatrixWidth; x++) {                pixels[offset + x] = bitMatrix.get(x, y) ?                        getResources().getColor(R.color.black):getResources().getColor(R.color.white);            }        }        Bitmap bitmap = Bitmap.createBitmap(bitMatrixWidth, bitMatrixHeight, Bitmap.Config.ARGB_4444);        bitmap.setPixels(pixels, 0, 500, 0, 0, bitMatrixWidth, bitMatrixHeight);        return bitmap;    }}

Step 7: Description of MainActivity.java

Following method saves the QRcode image.

 public String saveImage(Bitmap myBitmap) {        ByteArrayOutputStream bytes = new ByteArrayOutputStream();        myBitmap.compress(Bitmap.CompressFormat.JPEG, 90, bytes);        File wallpaperDirectory = new File(                Environment.getExternalStorageDirectory() + IMAGE_DIRECTORY);        // have the object build the directory structure, if needed.        if (!wallpaperDirectory.exists()) {            Log.d("dirrrrrr", "" + wallpaperDirectory.mkdirs());            wallpaperDirectory.mkdirs();        }        try {            File f = new File(wallpaperDirectory, Calendar.getInstance()                    .getTimeInMillis() + ".jpg");            f.createNewFile();   //give read write permission            FileOutputStream fo = new FileOutputStream(f);            fo.write(bytes.toByteArray());            MediaScannerConnection.scanFile(this,                    new String[]{f.getPath()},                    new String[]{"image/jpeg"}, null);            fo.close();            Log.d("TAG", "File Saved::--->" + f.getAbsolutePath());            return f.getAbsolutePath();        } catch (IOException e1) {            e1.printStackTrace();        }        return "";    }

IMAGE_DIRECTORY is the folder in which image is saved.

Image will be saved in the internal memory of android device.

You can change the value of IMAGE_DIRECTORY variable to customize the location to which you want to save generated QRCode image.

Below method will generate QRCode from given string.

 private Bitmap TextToImageEncode(String Value) throws WriterException {        BitMatrix bitMatrix;        try {            bitMatrix = new MultiFormatWriter().encode(                    Value,                    BarcodeFormat.DATA_MATRIX.QR_CODE,                    QRcodeWidth, QRcodeWidth, null            );        } catch (IllegalArgumentException Illegalargumentexception) {            return null;        }        int bitMatrixWidth = bitMatrix.getWidth();        int bitMatrixHeight = bitMatrix.getHeight();        int[] pixels = new int[bitMatrixWidth * bitMatrixHeight];        for (int y = 0; y < bitMatrixHeight; y++) {            int offset = y * bitMatrixWidth;            for (int x = 0; x < bitMatrixWidth; x++) {                pixels[offset + x] = bitMatrix.get(x, y) ?                        getResources().getColor(R.color.black):getResources().getColor(R.color.white);            }        }        Bitmap bitmap = Bitmap.createBitmap(bitMatrixWidth, bitMatrixHeight, Bitmap.Config.ARGB_4444);        bitmap.setPixels(pixels, 0, 500, 0, 0, bitMatrixWidth, bitMatrixHeight);        return bitmap;    }

Above method will use various classes of ZXing library to create QRCode from given string.

Implementation of a button click.

 btn.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                if(etqr.getText().toString().trim().length() == 0){                    Toast.makeText(MainActivity.this, "Enter String!", Toast.LENGTH_SHORT).show();                }else {                    try {                        bitmap = TextToImageEncode(etqr.getText().toString());                        iv.setImageBitmap(bitmap);                        String path = saveImage(bitmap);  //give read write permission                        Toast.makeText(MainActivity.this, "QRCode saved to -> "+path, Toast.LENGTH_SHORT).show();                    } catch (WriterException e) {                        e.printStackTrace();                    }                }            }        });

If there is no string is entered, a message is printed to enter a string.

Otherwise, QRcode is generated and saved.

So all for generate create QR code ZXing Android Studio programmatically example tutorial. Thank you.

Source: https://demonuts.com/generate-qr-code/

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