diff --git a/app/build.gradle b/app/build.gradle
index 1ea9b01..3397ec3 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -8,7 +8,7 @@ android {
 
     defaultConfig {
         applicationId "com.xypower.mppreview"
-        minSdk 28
+        minSdk 30
         targetSdk 30
         versionCode 3
         versionName "1.2"
diff --git a/app/src/main/java/com/xypower/mppreview/MainActivity.java b/app/src/main/java/com/xypower/mppreview/MainActivity.java
index 4c6fa6a..18c84a7 100644
--- a/app/src/main/java/com/xypower/mppreview/MainActivity.java
+++ b/app/src/main/java/com/xypower/mppreview/MainActivity.java
@@ -34,7 +34,6 @@ import com.xypower.mppreview.ui.CameraChannelActivity;
 import com.xypower.mppreview.utils.PhotoUtil;
 import com.xypower.mppreview.bean.Contants;
 import com.xypower.mppreview.utils.CameraUtils;
-import com.xypower.mppreview.utils.RouteManager;
 
 
 import java.io.File;
@@ -213,6 +212,7 @@ public class MainActivity extends AppCompatActivity implements View.OnClickListe
         CameraManager manager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
         try {
             String[] cameraIds = manager.getCameraIdList();
+
             return cameraIds.length;
         } catch (CameraAccessException e) {
             e.printStackTrace();
diff --git a/app/src/main/java/com/xypower/mppreview/ui/CameraChannelActivity.java b/app/src/main/java/com/xypower/mppreview/ui/CameraChannelActivity.java
index 5176c0a..bd74478 100644
--- a/app/src/main/java/com/xypower/mppreview/ui/CameraChannelActivity.java
+++ b/app/src/main/java/com/xypower/mppreview/ui/CameraChannelActivity.java
@@ -71,11 +71,23 @@ public class CameraChannelActivity extends AppCompatActivity implements View.OnC
 
     private void initEvent() {
         viewBinding.imageCaptureButton.setOnClickListener(this);
+        viewBinding.foward.setOnClickListener(this);
+        viewBinding.back.setOnClickListener(this);
     }
 
     @Override
     public void onClick(View v) {
-        takePhoto();
+        switch (v.getId()) {
+            case R.id.image_capture_button:
+                takePhoto();
+                break;
+            case R.id.foward:
+                setInt(311, 101);
+                break;
+            case R.id.back:
+                setInt(311, 201);
+                break;
+        }
     }
 
     private void startCamera(int cameraid) {
@@ -110,7 +122,7 @@ public class CameraChannelActivity extends AppCompatActivity implements View.OnC
                 processCameraProvider.unbindAll();
 
                 // 绑定用例至相机
-                processCameraProvider.bindToLifecycle(CameraChannelActivity.this, cameraSelector, preview,imageCapture,imageAnalysis);
+                processCameraProvider.bindToLifecycle(CameraChannelActivity.this, cameraSelector, preview, imageCapture, imageAnalysis);
 
             } catch (Exception e) {
                 Log.e(Contants.TAG, "用例绑定失败！" + e);
diff --git a/app/src/main/res/layout/activity_camera_channel.xml b/app/src/main/res/layout/activity_camera_channel.xml
index 73f3688..f65187d 100644
--- a/app/src/main/res/layout/activity_camera_channel.xml
+++ b/app/src/main/res/layout/activity_camera_channel.xml
@@ -12,17 +12,28 @@
         android:layout_width="match_parent"
         android:layout_height="match_parent" />
 
-<!--    <Button-->
-<!--        android:id="@+id/image_capture_button"-->
-<!--        android:layout_width="110dp"-->
-<!--        android:layout_height="110dp"-->
-<!--        android:layout_marginEnd="50dp"-->
-<!--        android:layout_marginBottom="50dp"-->
-<!--        android:elevation="2dp"-->
-<!--        android:text="拍照"-->
-<!--        app:layout_constraintBottom_toBottomOf="parent"-->
-<!--        app:layout_constraintEnd_toStartOf="@id/vertical_centerline"-->
-<!--        app:layout_constraintLeft_toLeftOf="parent" />-->
+    <Button
+        android:id="@+id/foward"
+        android:layout_width="wrap_content"
+        android:layout_height="50dp"
+        android:layout_marginLeft="20dp"
+        android:layout_marginBottom="40dp"
+        android:shadowColor="@null"
+        android:text="向前"
+        app:layout_constraintBottom_toTopOf="@+id/image_capture_button"
+        app:layout_constraintLeft_toLeftOf="parent" />
+
+    <Button
+        android:id="@+id/back"
+        android:layout_width="wrap_content"
+        android:layout_height="50dp"
+        android:layout_marginLeft="30dp"
+        android:layout_marginBottom="40dp"
+        android:shadowColor="@null"
+        android:text="向后"
+        app:layout_constraintBottom_toTopOf="@+id/image_capture_button"
+        app:layout_constraintLeft_toRightOf="@+id/foward" />
+
     <Button
         android:id="@+id/image_capture_button"
         android:layout_width="50dp"
@@ -35,7 +46,6 @@
         app:layout_constraintRight_toRightOf="parent" />
 
 
-
     <androidx.constraintlayout.widget.Guideline
         android:id="@+id/vertical_centerline"
         android:layout_width="wrap_content"