diff --git a/app/src/main/java/xyz/mtfos/btdemo/PrinterBle.java b/app/src/main/java/xyz/mtfos/btdemo/PrinterBle.java
index 79e1a4b..1a3e216 100644
--- a/app/src/main/java/xyz/mtfos/btdemo/PrinterBle.java
+++ b/app/src/main/java/xyz/mtfos/btdemo/PrinterBle.java
@@ -248,6 +248,9 @@ public class PrinterBle {
         }
 
         mState = CONNECTING;
+        if(this.mStateListener != null) {
+            this.mStateListener.onChange(mState);
+        }
     }
 
     public void stopScan() {
@@ -260,7 +263,12 @@ public class PrinterBle {
             mAdapter.stopLeScan(mLeScanCB);
         }
 
-        if (mState == CONNECTING) mState = DISCONNECTED;
+        if (mState == CONNECTING) {
+            mState = DISCONNECTED;
+            if(this.mStateListener != null) {
+                this.mStateListener.onChange(mState);
+            }
+        }
     }
 
     /**
@@ -390,13 +398,13 @@ public class PrinterBle {
             default:
                 return this;
         }
-        addText("__a" + strAlign + "__");
+        addText("__&a" + strAlign + "__");
         return this;
     }
 
     public void setSize(int w, int h) {
         if (w < 1 || h < 1 || w > 3 || h > 3) return;
-        addText(String.format("__s%d,%d__", w, h));
+        addText(String.format("__&s%d,%d__", w, h));
     }
 
     public void resetSize() {