Android combined custom controls implement shopping cart addition and subtraction operations

public class MainActivity extends AppCompatActivity {

    private Addand mAddand;
  
    @Override
    protected void onCreate(Bundle savedInstanceState) {
      (savedInstanceState);
      setContentView(.activity_main);
      mAddand= findViewById();
  
      (new () {
        @Override
        public void OnNumberChanged(int vs) {
          (, vs+"", Toast.LENGTH_SHORT).show();
        }
      });
    }
  }

< xmlns:andro
  xmlns:app="/apk/res-auto"
  xmlns:tools="/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  tools:context=".MainActivity"
  android:orientation="horizontal">

  <
    android:
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>

</>

public class Addand extends FrameLayout implements {
  private ImageView mImage1;
  private ImageView mImage2;
  private TextView mText;
  int value;

  public Addand(@NonNull Context context) {
    this(context,null);
  }

  public Addand(@NonNull Context context, @Nullable AttributeSet attrs) {
    this(context, attrs,0);
  }

  public Addand(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);

    findView(context);
  }

  private void findView(Context context) {
    View view = (context, , this);

     mImage1 =(.image1);
     mImage2 = (.image2);
     mText = ();

     value=getValue();

     setValue(value);

     (this);
     (this);
  }
  private int vs=1;
  public int getValue() { //Get the value
    String trim = ().toString().trim();
    if (!(trim)){
      (vs);
    }
    return vs;
  }

  public void setValue(int value) {
    (value+"");
  }

  @Override
  public void onClick(View view) {

    switch (()){
      case .image1:
        add();
        break;
      case .image2:
        jian();
        break;
    }
  }

  private void jian() {
    if (vs>1){
      vs--;
      setValue(vs);
    }

    (vs);
  }

  private void add() {

    if (vs<6){
      vs++;
      setValue(vs);
    }

    (vs);
  }

  public interface OnNumberChangedListener{
    void OnNumberChanged(int vs);
  }

  private OnNumberChangedListener mOnNumberChangedListener;

  public void setOnNumberChangedListener(OnNumberChangedListener onNumberChangedListener){
      mOnNumberChangedListener=onNumberChangedListener;
  }

}

<LinearLayout xmlns:andro
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="horizontal">

  <ImageView
    android:
    android:layout_width="20dp"
    android:layout_height="20dp"
    android:src="@drawable/ic_launcher_background"/>

  <TextView
    android:
    android:layout_width="50dp"
    android:layout_height="20dp"
    android:gravity="center"
    android:text="1"/>

  <ImageView
    android:
    android:layout_width="20dp"
    android:layout_height="20dp"
    android:src="@drawable/ic_launcher_background"/>
</LinearLayout>