diff --git a/app/src/main/java/com/xypower/mpapp/MainActivity.java b/app/src/main/java/com/xypower/mpapp/MainActivity.java
index a5570911..56f10311 100644
--- a/app/src/main/java/com/xypower/mpapp/MainActivity.java
+++ b/app/src/main/java/com/xypower/mpapp/MainActivity.java
@@ -29,6 +29,7 @@ import android.telephony.TelephonyManager;
 import android.text.TextUtils;
 import android.text.method.ScrollingMovementMethod;
 import android.util.Log;
+import android.view.KeyEvent;
 import android.view.View;
 import android.view.WindowManager;
 import android.widget.Toast;
@@ -796,4 +797,15 @@ public class MainActivity extends AppCompatActivity {
 //        nettyChatClient.connect();
 //         }
 
+    @Override
+    public boolean onKeyDown(int keyCode, KeyEvent event) {
+        if (keyCode == KeyEvent.KEYCODE_BACK) {
+            // Back pressed
+            return true; // disable it
+        }
+
+        return super.onKeyDown(keyCode, event);
+    }
+
+
 }
\ No newline at end of file
diff --git a/mpmaster/src/main/java/com/xypower/mpmaster/MainActivity.java b/mpmaster/src/main/java/com/xypower/mpmaster/MainActivity.java
index 99ca2b27..ee0a072e 100644
--- a/mpmaster/src/main/java/com/xypower/mpmaster/MainActivity.java
+++ b/mpmaster/src/main/java/com/xypower/mpmaster/MainActivity.java
@@ -13,6 +13,7 @@ import android.os.Build;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.StrictMode;
+import android.view.KeyEvent;
 import android.view.View;
 import android.widget.Switch;
 
@@ -165,4 +166,14 @@ public class MainActivity extends AppCompatActivity {
             context.startService(intent);
         }
     }
+
+    @Override
+    public boolean onKeyDown(int keyCode, KeyEvent event) {
+        if (keyCode == KeyEvent.KEYCODE_BACK) {
+            // Back pressed
+            return true; // disable it
+        }
+
+        return super.onKeyDown(keyCode, event);
+    }
 }
\ No newline at end of file