Cfrgtkky

Previously I wanted to apologize for my ignorance, here are some that I have made, I made a qrcode generator that does not use EditText and also the Button to enter strings, I hope to be able to make a qrcode via Phone Number on the activity profile that I created, but when I running qrcode that I get only contains the word "false", again apologizing for the ignorance I will stackoverflow, because I'm a new user here. (R.id.phone) in xml. my profile, I try to use a different xml, thank you all,-

public class MyQrcodeActivity extends AppCompatActivity {

private String qrCodeData;

public TextView vPhone;

private User user = null;



@SuppressLint("ResourceType")

@Override

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_my_qrcode);

    getSupportActionBar().setDisplayHomeAsUpEnabled(true);

    getSupportActionBar().setTitle("My QR");

    try {

        qrCodeData = getResources().getResourceName(R.id.phone);

    } catch (Exception e) {

        e.printStackTrace();

    }

    qrGenerator();

}



public void qrGenerator() {

    try {

        //setting size of qr code

        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 smallestDimension = width < height ? width : height;

        //setting parameters for qr code

        String charset = "UTF-8"; // or "ISO-8859-1"

        Map<EncodeHintType, ErrorCorrectionLevel> hintMap = new HashMap<EncodeHintType, ErrorCorrectionLevel>();

        hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);

        createQRCode(qrCodeData, charset, hintMap, smallestDimension, smallestDimension);



    } catch (Exception ex) {

        Log.e("QrGenerate", ex.getMessage());

    }

}



public void createQRCode(String qrCodeData, String charset, Map hintMap, int qrCodeheight, int qrCodewidth) {



    try {

        //generating qr code in bitmatrix type

        BitMatrix matrix = new MultiFormatWriter().encode(new String(qrCodeData.getBytes(charset), charset), BarcodeFormat.QR_CODE, qrCodewidth, qrCodeheight, hintMap);

        //converting bitmatrix to bitmap

        int width = matrix.getWidth();

        int height = matrix.getHeight();

        int pixels = new int[width * height];

        // All are 0, or black, by default

        for (int y = 0; y < height; y++) {

            int offset = y * width;

            for (int x = 0; x < width; x++) {

                pixels[offset + x] = matrix.get(x, y) ? BLACK : WHITE;

            }

        }



        Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);

        bitmap.setPixels(pixels, 0, width, 0, 0, width, height);

        //setting bitmap to image view

        ImageView myImage = (ImageView) findViewById(R.id.imageViewBitmap);

        myImage.setImageBitmap(bitmap);

    } catch (Exception er) {

        Log.e("QrGenerate", er.getMessage());

    }

}



@Override

public boolean onOptionsItemSelected (MenuItem item){

    int id = item.getItemId();

    if (id == android.R.id.home) {

        onBackPressed();

        return true;

    }

    return super.onOptionsItemSelected(item);

}

}

Take ImageView in your xml :

<ImageView

            android:id="@+id/qrcode"

            android:layout_width="@dimen/sdp200"

            android:layout_height="@dimen/sdp200"

            android:layout_centerHorizontal="true"

            android:layout_marginTop="10dp"

            android:layout_marginBottom="@dimen/margin10"

            android:layout_below="@+id/relativeLayout2"

            android:contentDescription="QR Code"/>

In your Activity :

ImageView qrcode = findViewById(R.id.qrcode); 

TextView txtnumber = findViewById(R.id.txtmobile);



String strMobile = txtnumber.getText().toString();



Bitmap lBitmap = QRCode.from(strMobile ).bitmap();

qrcode.setImageBitmap(lBitmap);

Add dependencies :

implementation 'com.github.kenglxn.QRGen:android:2.2.0'    

It will generate qrcode of mobile number.

Hope this will help you.