How can Android implement the function of generating QR codes for sharing?

2 years ago
Olivia Parker
2 minutes

To implement the feature of generating QR codes for sharing on Android, you can use a third-party library to assist. Below is an example code using the ZXing library to generate QR codes.

  1. construct.gradle
dependencies {
    implementation 'com.google.zxing:core:3.4.0'
    implementation 'com.journeyapps:zxing-android-embedded:3.4.0'
}
  1. Create a method in your Activity to generate a QR code.
private Bitmap generateQRCode(String content) {
    MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
    try {
        BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, 200, 200);
        BarcodeEncoder barcodeEncoder = new BarcodeEncoder();
        return barcodeEncoder.createBitmap(bitMatrix);
    } catch (WriterException e) {
        e.printStackTrace();
        return null;
    }
}
  1. Call this method in the click event of your share button to generate a QR code and share it.
String content = "要分享的内容";
Bitmap qrCode = generateQRCode(content);

if (qrCode != null) {
    File cachePath = new File(getCacheDir(), "images");
    cachePath.mkdirs();
    try {
        FileOutputStream stream = new FileOutputStream(cachePath + "/qr_code.png");
        qrCode.compress(Bitmap.CompressFormat.PNG, 100, stream);
        stream.close();
    } catch (IOException e) {
        e.printStackTrace();
    }

    File imagePath = new File(getCacheDir(), "images");
    File newFile = new File(imagePath, "qr_code.png");
    Uri contentUri = FileProvider.getUriForFile(this, "com.your.package.name.fileprovider", newFile);

    Intent shareIntent = new Intent();
    shareIntent.setAction(Intent.ACTION_SEND);
    shareIntent.putExtra(Intent.EXTRA_STREAM, contentUri);
    shareIntent.setType("image/png");
    shareIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
    startActivity(Intent.createChooser(shareIntent, "分享二维码"));
} else {
    Toast.makeText(this, "生成二维码失败", Toast.LENGTH_SHORT).show();
}

The code above will save the generated QR code to the application’s cache directory and create a share intent to share the QR code image. You will need to replace com.your.package.name with your application package name and configure a FileProvider in the AndroidManifest.xml to share the image.

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