diff --git a/app/src/main/java/com/xypower/mpremote/DeviceActivity.java b/app/src/main/java/com/xypower/mpremote/DeviceActivity.java
index c748077..501e397 100644
--- a/app/src/main/java/com/xypower/mpremote/DeviceActivity.java
+++ b/app/src/main/java/com/xypower/mpremote/DeviceActivity.java
@@ -20,6 +20,7 @@ import android.text.TextUtils;
 import android.text.format.Formatter;
 import android.util.Base64;
 import android.util.Log;
+import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
 import android.widget.Toast;
@@ -132,7 +133,6 @@ public class DeviceActivity extends AppCompatActivity {
             AdbKeyPair.generate(priKeyFile, pubKeyFile);
         }
 
-
         mAdbKeyPair = AdbKeyPair.read(priKeyFile, pubKeyFile);
         final Context context = getApplicationContext();
 
@@ -150,7 +150,15 @@ public class DeviceActivity extends AppCompatActivity {
             }
         });
 
-        mProgressDialog = ProgressDialog.show(this, "", "连接" + mDeviceIp + "中", true, true);
+        loadDeviceInfo(context, true);
+    }
+
+    protected void loadDeviceInfo(final Context context, boolean firstConnect) {
+
+        binding.deviceInfo.setText("");
+
+        String msg = firstConnect ? "连接" + mDeviceIp + "中" : "刷新数据中";
+        mProgressDialog = ProgressDialog.show(this, "", msg, true, true);
         mProgressDialog.setOnCancelListener(new DialogInterface.OnCancelListener() {
             @Override
             public void onCancel(DialogInterface dialogInterface) {
@@ -158,16 +166,12 @@ public class DeviceActivity extends AppCompatActivity {
             }
         });
 
-        loadDeviceInfo(context);
-    }
 
-    protected void loadDeviceInfo(final Context context) {
         final File fileTmp = new File(getFilesDir(), "tmp");
         if (!fileTmp.exists()) {
             fileTmp.mkdirs();
         }
 
-
         (new Thread(new Runnable() {
             @Override
             public void run() {
@@ -340,9 +344,6 @@ public class DeviceActivity extends AppCompatActivity {
                         ex.printStackTrace();
                     }
                 }
-
-
-
             }
         })).start();
     }
@@ -698,12 +699,22 @@ public class DeviceActivity extends AppCompatActivity {
         stringBuilder.append("<br>");
     }
 
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        // Inflate the menu; this adds items to the action bar if it is present.
+        getMenuInflater().inflate(R.menu.device_activity_actions, menu);
+        return true;
+    }
+
     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
         switch (item.getItemId()) {
             case android.R.id.home:
                 finish();
                 return false;
+            case R.id.action_refresh:
+                loadDeviceInfo(getApplicationContext(), false);
+                return false;
             default:
                 return super.onOptionsItemSelected(item);
         }
diff --git a/app/src/main/res/menu/device_activity_actions.xml b/app/src/main/res/menu/device_activity_actions.xml
new file mode 100644
index 0000000..da3105e
--- /dev/null
+++ b/app/src/main/res/menu/device_activity_actions.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:id="@+id/action_refresh"
+        android:icon="@drawable/ic_action_refresh"
+        android:title="@string/action_refresh"
+        app:showAsAction="always" />
+</menu>
\ No newline at end of file