How To Generate QR Code In Android

Mushtaq M A

6y169k15100Article

AndroidGenerate QR Code In Android

15 Comments

Join the conversation! Your thoughts help the community grow.

M L7y ago
How to saved qr code in gallery?
Mohammed Faraz7y ago
How to print it you can mail me @ [email protected]
Michele Stizza7y ago
Saved QR Image does not show in Gallery?
Reignier Suyom7y ago
How to get the text in textView and generates into QRcode without typing text, example like in Ordering app
Usman Hafeez7y ago
Saved QR Image does not show in Gallery???
Usman Hafeez7y ago
If i want to generate QR code output in a Dialog box with Share, Save, and Cancel Button what will be the code.
Bhavik Desai7y ago
How to insert multiple input in qr code
ismaili amine7y ago
When we save an image, is that mean that store it in a database or just a copy. I want to know if a can store these QR codes into a database integrated into App using SQlite or MySQL?
- Mushtaq M A7y ago
  Yes, we can save the bitmap generated as byte array and save to SQLite DB with BLOB type
ismaili amine7y ago
I try to save the image after I generate it, but always show me "Image not saved"
- Mushtaq M A7y ago
  Check that, have you provide the permission for the app?
Rajanikant Hawaldar8y ago
Google vision API also other company dll how to create own api for QR Code logic
Rajanikant Hawaldar8y ago
How to achieve the same without using third-party dll?
- Mushtaq M A8y ago
  We can use Google Vision API
Viknaraj Manogararajah8y ago
superb article.....

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.

Step 1: Creating a New Project with Empty Activity.
Step 2: Setting up the library and manifest.
Step 3: Generating a QR Code.
Step 4: Saving the QR Code

Step 1 - Creating a New Project with Android Studio

Open Android Studio and select "Create New Project".
Name the project as per your wish and select your activity template.
Click the “Finish” button to create a new project in Android Studio.

Step 2 - Setting up the library and manifest

Open the App-level Gradle file and import the library.
1. implementation 'androidmads.library.qrgenearator:QRGenearator:1.0.3'

Then, click “Sync Now”.
Then, open your Manifest file and add the following permissions. It is used to save QR Code to file storage.
1. <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

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 a 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 the 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.