fix camera

app/src/main/java/com/ouxuan/oxface/MainActivity.java

@@ -1294,6 +1294,7 @@ public class MainActivity extends AppCompatActivity {
             // 跳转到人脸识别界面
             Intent intent = new Intent(MainActivity.this, OXFaceOnlineActivity.class);
             startActivity(intent);
+            finish(); // 关闭MainActivity，避免进入后台状态
 
             logMessage = "已启动人脸识别界面";
             android.util.Log.d("MainActivity", logMessage);