1 files changed, 68 insertions, 0 deletions
diff --git a/src/main/java/de/thedevstack/conversationsplus/utils/ui/QrCodeUtil.java b/src/main/java/de/thedevstack/conversationsplus/utils/ui/QrCodeUtil.java
new file mode 100644
index 00000000..1c342290
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/utils/ui/QrCodeUtil.java
@@ -0,0 +1,68 @@
+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() {}
+}