diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index a2844e0..b0c289b 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -31,18 +31,19 @@
             android:name="com.echo.colorizeit.ui.a_open_screen_activity.OpenScreenActivity"
             android:exported="true"
             android:label="@string/app_name"
+            android:screenOrientation="portrait"
             android:theme="@style/Theme.MyApplication.NoActionBar">
-            <!--            <intent-filter>-->
-            <!--                <action android:name="android.intent.action.MAIN" />-->
-
-            <!--                <category android:name="android.intent.category.LAUNCHER" />-->
-            <!--            </intent-filter>-->
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
 
         </activity>
         <activity
             android:name="com.echo.colorizeit.MainActivity"
             android:exported="true"
             android:label="@string/app_name"
+            android:screenOrientation="portrait"
             android:theme="@style/Theme.MyApplication.NoActionBar">
             <!--            <intent-filter>-->
             <!--                <action android:name="android.intent.action.MAIN" />-->
@@ -54,11 +55,13 @@
             android:name="com.echo.colorizeit.ui.a_image_upload_activity.ImageUploadViewActivity"
             android:exported="true"
             android:label="@string/app_name"
+            android:screenOrientation="portrait"
             android:theme="@style/Theme.MyApplication.NoActionBar"></activity>
         <activity
             android:name="com.echo.colorizeit.ui.a_camera_activity.CameraKitActivity"
             android:exported="true"
             android:label="@string/app_name"
+            android:screenOrientation="portrait"
             android:theme="@style/Theme.MyApplication.NoActionBar"></activity>
         <activity
             android:name="com.echo.colorizeit.myganme.GameActivity"
@@ -67,11 +70,11 @@
             android:label="@string/app_name"
             android:screenOrientation="landscape"
             android:theme="@style/Theme.MyApplication.NoActionBar">>
-            <intent-filter>
-                <action android:name="android.intent.action.MAIN" />
+            <!--            <intent-filter>-->
+            <!--                <action android:name="android.intent.action.MAIN" />-->
 
-                <category android:name="android.intent.category.LAUNCHER" />
-            </intent-filter>
+            <!--                <category android:name="android.intent.category.LAUNCHER" />-->
+            <!--            </intent-filter>-->
 
         </activity>
 
diff --git a/app/src/main/java/com/echo/colorizeit/ui/a_open_screen_activity/OpenScreenActivity.java b/app/src/main/java/com/echo/colorizeit/ui/a_open_screen_activity/OpenScreenActivity.java
index d7c09ee..c20a854 100644
--- a/app/src/main/java/com/echo/colorizeit/ui/a_open_screen_activity/OpenScreenActivity.java
+++ b/app/src/main/java/com/echo/colorizeit/ui/a_open_screen_activity/OpenScreenActivity.java
@@ -20,6 +20,7 @@ import androidx.lifecycle.ViewModelProvider;
 import com.daimajia.androidanimations.library.Techniques;
 import com.daimajia.androidanimations.library.YoYo;
 import com.echo.colorizeit.MainActivity;
+import com.echo.colorizeit.myganme.GameActivity;
 import com.echo.colorizeit.ui.BaseActivity;
 import com.example.myapplication.R;
 import com.example.myapplication.databinding.OpenScreenBinding;
@@ -40,6 +41,7 @@ public class OpenScreenActivity extends BaseActivity {
         openScreen_element_fade_in = AnimationUtils.loadAnimation(this, R.anim.anim_open_screen);
         makeFullScreen();
 
+
         anim_play_view_fade_out.setAnimationListener(new Animation.AnimationListener() {
             @Override
             public void onAnimationStart(Animation animation) {
@@ -79,6 +81,7 @@ public class OpenScreenActivity extends BaseActivity {
         });
         binding = OpenScreenBinding.inflate(getLayoutInflater());
         setContentView(binding.getRoot());
+        binding.animationView.enableMergePathsForKitKatAndAbove(true);
 
         if (model.check_if_user_first_enter(this)) {//第一次
             model.mark_user_entered_this_app();
@@ -152,13 +155,25 @@ public class OpenScreenActivity extends BaseActivity {
         });
     }
 
-
+    @Override
+    protected void onStart() {
+        super.onStart();
+        if(model.getShowAlterDialog().getValue())
+            showAlterDialog();
+    }
 
     private void showAlterDialog() {
         final AlertDialog.Builder alterDiaglog = new AlertDialog.Builder(this);
 
         alterDiaglog.setTitle("No Internet");//文字
         alterDiaglog.setMessage("Please connect to Internet to continue.");//提示消息
+        alterDiaglog.setPositiveButton("Play a Game", new DialogInterface.OnClickListener() {
+            @Override
+            public void onClick(DialogInterface dialog, int which) {
+                Intent intent = new Intent(_this, GameActivity.class);
+                startActivity(intent);
+            }
+        });
 
         alterDiaglog.setNegativeButton("Exit", new DialogInterface.OnClickListener() {
             @Override
diff --git a/app/src/main/java/com/echo/colorizeit/ui/a_open_screen_activity/OpenScreenViewModel.java b/app/src/main/java/com/echo/colorizeit/ui/a_open_screen_activity/OpenScreenViewModel.java
index d4660ad..9da37c5 100644
--- a/app/src/main/java/com/echo/colorizeit/ui/a_open_screen_activity/OpenScreenViewModel.java
+++ b/app/src/main/java/com/echo/colorizeit/ui/a_open_screen_activity/OpenScreenViewModel.java
@@ -23,6 +23,7 @@ public class OpenScreenViewModel extends ViewModel {
         Is_user_first_enter_this_app = new MutableLiveData<>();
         gotoMainActivity = new MutableLiveData<>();
         showAlterDialog = new MutableLiveData<>();
+        showAlterDialog.setValue(false);
 
     }