Android Plugin OnCreate() function? (Unity project automatically open android peoject)

Recently, I succeeded to integrate my Android project into my Unity project, but it automatically open my android project instead of Unity scene.

I suspect that OnCreate() is called once the Unity project is opened? This is my OnCreate() function:

  public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN);
         setContentView(R.layout.activity_live_broadcast);
 
 
         screenWidth = getResources().getDisplayMetrics().widthPixels;
         screenHeight = getResources().getDisplayMetrics().heightPixels;
         setSurfaceSize(videoWidth, videoHeight);
         final Button button = (Button) findViewById(R.id.recordButton);
         button.setOnClickListener(new View.OnClickListener() {
                                       public void onClick(View v) {
                                           startRecording();
                                      
                                       }
                                   });
       // initCamera();
     }