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How To Generate QR Code In Android

QR-CODE  GENERATOR - Library

Introduction: 

In this article, we will learn how to generate QR Code in Android. Quick Response Code (QR Code in short) is a 2-Dimensional matrix type barcode used to store data. It is more popular because of its storage capacity and fast readability.

Zxing & QR Generator Library:

Zebra Crossing (Zxing) is an awesome library used to generate and read QR codes in mobile apps. But it is bigger in size. So, we have to go for another one, QR Generator which is a tiny, open source library. In this article, we will learn how to create & save the QR Code in Android programmatically.

Steps:

I have split this part into 4 steps as in the following.
  1. Creating a New Project with Empty Activity.
  2. Setting up the library and manifest.
  3. Generating QR Code.
  4. Saving QR Code.

Step 1 - Creating New Project with Empty Activity

  1. Open Android Studio and Select create a new project.
  2. Name the project as per your wish and select an Empty activity.
    Android
  3. Click finish button to create a new project in Android Studio.

Step 2 - Setting up the library and manifest

  1. Open App level gradle file and import the library.
    implementation 'androidmads.library.qrgenearator:QRGenearator:1.0.3'
  2. The, click “Sync Now”.
  3. Then, open your Manifest file and add the following permissions. It is used to save QR Code to file storage.
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
  4. We need to handle runtime permissions from Android Version 6.0.

Step 3 - Generating QR Code

In this step, we will learn how to generate QR Code in Android. Open your MainActivity.java file and add the following lines.
QRGEncoder qrgEncoder = new QRGEncoder(inputValue, null, QRGContents.Type.TEXT, smallerDimension);
      - Here, inputValue is an input to be converted to QR Code.
      - Input Type also can be specified while initializing the library.
      - We can specify the dimensions also.
    Then, add the following lines to create QR Code and encode that into Bitmap Format.
    try {  
      // Getting QR-Code as Bitmap  
      bitmap = qrgEncoder.encodeAsBitmap();  
      // Setting Bitmap to ImageView  
      qrImage.setImageBitmap(bitmap);  
    } catch (WriterException e) {  
      Log.v(TAG, e.toString());  
    }
    qrImage is an ImageView used to preview the generated QR code bitmap.

Step 4 - Saving QR Code

QR Generator has an option to save the generated QR Code Bitmap to storage using the following lines.
// Save with location, value, bitmap returned and type of Image(JPG/PNG).  
QRGSaver.save(savePath, edtValue.getText().toString().trim(), bitmap, QRGContents.ImageType.IMAGE_JPEG);
We can save QR Code in PNG & JPG format also. We have to handle runtime permissions from Android version 6.0.

Full Code

You can find the full code implementation here.
public class MainActivity extends AppCompatActivity {  
  
    String TAG = "GenerateQRCode";  
    EditText edtValue;  
    ImageView qrImage;  
    Button start, save;  
    String inputValue;  
    String savePath = Environment.getExternalStorageDirectory().getPath() + "/QRCode/";  
    Bitmap bitmap;  
    QRGEncoder qrgEncoder;  
  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
  
        qrImage = (ImageView) findViewById(R.id.QR_Image);  
        edtValue = (EditText) findViewById(R.id.edt_value);  
        start = (Button) findViewById(R.id.start);  
        save = (Button) findViewById(R.id.save);  
  
        start.setOnClickListener(new View.OnClickListener() {  
            @Override  
            public void onClick(View view) {  
                inputValue = edtValue.getText().toString().trim();  
                if (inputValue.length() > 0) {  
                    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 smallerDimension = width < height ? width : height;  
                    smallerDimension = smallerDimension * 3 / 4;  
  
                    qrgEncoder = new QRGEncoder(  
                            inputValue, null,  
                            QRGContents.Type.TEXT,  
                            smallerDimension);  
                    try {  
                        bitmap = qrgEncoder.encodeAsBitmap();  
                        qrImage.setImageBitmap(bitmap);  
                    } catch (WriterException e) {  
                        Log.v(TAG, e.toString());  
                    }  
                } else {  
                    edtValue.setError("Required");  
                }  
            }  
        });  
  
        save.setOnClickListener(new View.OnClickListener() {  
            @Override  
            public void onClick(View v) {  
                boolean save;  
                String result;  
                try {  
                    save = QRGSaver.save(savePath, edtValue.getText().toString().trim(), bitmap, QRGContents.ImageType.IMAGE_JPEG);  
                    result = save ? "Image Saved" : "Image Not Saved";  
                    Toast.makeText(getApplicationContext(), result, Toast.LENGTH_LONG).show();  
                } catch (Exception e) {  
                    e.printStackTrace();  
                }  
            }  
        });  
  
    }  
}

Download Code

You can download the full source code of the article in GitHub. If you like this article, do star the repo in GitHub.

QR-Code Generator - Library

QR-CODE  GENERATOR - Library
In this Post, I introduce my new Gradle Library. This Library is used to Generate QR Code Automatically for our specified input.
How to Import the Library:
Gradle:
compile 'androidmads.library.qrgenearator:QRGenearator:1.0.0'
Permission:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
How to use this Library:
After importing this library, use the following lines to use this library. The following lines are used to generated the QR Code
// Initializing the QR Encoder with your value to be encoded, type you required and Dimension
QRGEncoder qrgEncoder = new QRGEncoder(inputValue, null, QRGContents.Type.TEXT, smallerDimension);
try {
  // Getting QR-Code as Bitmap
  bitmap = qrgEncoder.encodeAsBitmap();
  // Setting Bitmap to ImageView
  qrImage.setImageBitmap(bitmap);
} catch (WriterException e) {
  Log.v(TAG, e.toString());
}
Save QR Code as Image
// Save with location, value, bitmap returned and type of Image(JPG/PNG).
QRGSaver.save(savePath, edtValue.getText().toString().trim(), bitmap, QRGContents.ImageType.IMAGE_JPEG);
For more Details Visit Here
Github Link:
Open Github
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