explictly scan for aztec and qr codes only

src/main/java/eu/siacs/conversations/services/BarcodeProvider.java

@@ -185,7 +185,7 @@ public class BarcodeProvider extends ContentProvider implements ServiceConnectio
             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;
+                    pixels[offset + x] = result.get(x, y) ? Color.BLACK : Color.WHITE;
                 }
             }
             final Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
@@ -195,32 +195,4 @@ public class BarcodeProvider extends ContentProvider implements ServiceConnectio
             return null;
         }
     }
-
-    static class TransferThread extends Thread {
-        InputStream in;
-        OutputStream out;
-
-        TransferThread(InputStream in, OutputStream out) {
-            this.in = in;
-            this.out = out;
-        }
-
-        @Override
-        public void run() {
-            byte[] buf = new byte[1024];
-            int len;
-
-            try {
-                while ((len = in.read(buf)) >= 0) {
-                    out.write(buf, 0, len);
-                }
-
-                in.close();
-                out.flush();
-                out.close();
-            } catch (IOException e) {
-                Log.e(Config.LOGTAG, "Exception transferring file", e);
-            }
-        }
-    }
 }

src/main/java/eu/siacs/conversations/ui/StartConversationActivity.java

@@ -626,7 +626,7 @@ public class StartConversationActivity extends XmppActivity implements OnRosterU
                 showCreateConferenceDialog();
                 return true;
             case R.id.action_scan_qr_code:
-                new IntentIntegrator(this).initiateScan();
+                new IntentIntegrator(this).initiateScan(Arrays.asList("AZTEC","QR_CODE"));
                 return true;
             case R.id.action_hide_offline:
                 mHideOfflineContacts = !item.isChecked();

src/main/java/eu/siacs/conversations/ui/TrustKeysActivity.java

@@ -21,6 +21,7 @@ import com.google.zxing.integration.android.IntentResult;
 import org.whispersystems.libaxolotl.IdentityKey;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -129,7 +130,7 @@ public class TrustKeysActivity extends OmemoActivity implements OnKeyStatusUpdat
 				if (hasPendingKeyFetches()) {
 					Toast.makeText(this, R.string.please_wait_for_keys_to_be_fetched, Toast.LENGTH_SHORT).show();
 				} else {
-					new IntentIntegrator(this).initiateScan();
+					new IntentIntegrator(this).initiateScan(Arrays.asList("AZTEC","QR_CODE"));
 					return true;
 				}
 		}