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package de.thedevstack.conversationsplus.utils.ui;
import android.app.AlertDialog;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.graphics.Point;
import android.widget.ImageView;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import java.util.Hashtable;
import de.thedevstack.android.logcat.Logging;
import de.thedevstack.conversationsplus.Config;
import de.thedevstack.conversationsplus.ui.XmppActivity;
/**
*/
public final class QrCodeUtil {
public static void showQrCode(XmppActivity activity) {
String uri = activity.getShareableUri();
if (uri != null) {
Point size = new Point();
activity.getWindowManager().getDefaultDisplay().getSize(size);
final int width = (size.x < size.y ? size.x : size.y);
Bitmap bitmap = QrCodeUtil.createQrCodeBitmap(uri, width);
ImageView view = new ImageView(activity);
view.setImageBitmap(bitmap);
AlertDialog.Builder builder = new AlertDialog.Builder(activity);
builder.setView(view);
builder.create().show();
}
}
public static Bitmap createQrCodeBitmap(String input, int size) {
Logging.d(Config.LOGTAG,"qr code requested size: "+size);
try {
final QRCodeWriter QR_CODE_WRITER = new QRCodeWriter();
final Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
final BitMatrix result = QR_CODE_WRITER.encode(input, BarcodeFormat.QR_CODE, size, size, hints);
final int width = result.getWidth();
final int height = result.getHeight();
final int[] pixels = new int[width * height];
for (int y = 0; y < height; y++) {
final int offset = y * width;
for (int x = 0; x < width; x++) {
pixels[offset + x] = result.get(x, y) ? Color.BLACK : Color.TRANSPARENT;
}
}
final Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
Logging.d(Config.LOGTAG,"output size: "+width+"x"+height);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
return bitmap;
} catch (final WriterException e) {
return null;
}
}
private QrCodeUtil() {}
}
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