Android自定义商品购买数量加减控件

@Override
public void onClick(View v) {
 if (v.getId() == R.id.btn_sub) {
    //Toast.makeText(mContext,"减",Toast.LENGTH_SHORT).show();
  subNum();
  if (onButtonClickListenter != null) {
   onButtonClickListenter.onButtonSubClick(v, value);
  }
 } else if (v.getId() == R.id.btn_add) {
    //Toast.makeText(mContext,"加",Toast.LENGTH_SHORT).show();
  addNum();
  if (onButtonClickListenter != null) {
   onButtonClickListenter.onButtonAddClick(v, value);
  }
 }
}
 
public interface OnButtonClickListenter {
 /**
  * 当增加按钮被点击的时候回调该方法
  *
  * @param view
  * @param value
  */
 public void onButtonAddClick(View view, int value);
 
 /**
  * 当减少按钮被点击的时候回调这个方法
  *
  * @param view
  * @param value
  */
 public void onButtonSubClick(View view, int value);
}
 
private OnButtonClickListenter onButtonClickListenter;
 
public void setOnButtonClickListenter(OnButtonClickListenter onButtonClickListenter) {
 this.OnButtonClickListenter= onButtonClickListenter;
}

public class MainActivity extends AppCompatActivity {
 
 private NumberAddSubView nb_addsub_view;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  nb_addsub_view = (NumberAddSubView) findViewById(R.id.nb_addsub_view);
 
  nb_addsub_view.setOnButtonClickListenter(new NumberAddSubView.OnButtonClickListenter() {
   @Override
   public void onButtonAddClick(View view, int value) {
    Toast.makeText(MainActivity.this,"AddClick Vaule=="+value,Toast.LENGTH_SHORT).show();
   }
 
   @Override
   public void onButtonSubClick(View view, int value) {
    Toast.makeText(MainActivity.this,"SubClick Vaule=="+value,Toast.LENGTH_SHORT).show();
   }
  });
 }
}