如何将值从适配器传递到活动（在oncreate方法中）我得到了值bt我希望该值在oncreate方法中声明

Question

主体活动

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_product_details);

    long ProductId = Long.parseLong(i.getStringExtra("product_id"));
    long CustomerId = 1;
    int sizeId = 1; // this is where i need int value to be passed
    int quantity = 201;
}

//here i am getting this id value successfully bt i want that value to be assigned to sideId int in on create method
@Override
public void onClickCheckbox(Integer id) {
    Log.d(TAG, String.valueOf(id));
}

public interface OnSizeClickInterface {
 void onClickCheckbox(Integer id);
}

@Override
public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
    holder.checkBox.setText(pList.get(position).getCode());
    holder.checkBox.setOnClickListener(view -> onSizeClickInterface.onClickCheckbox(pList.get(position).getId()));

}

Answer 1

将sizeid作为全局变量，并在MainActivity的onclickcheckbox()中赋新值，然后可以从那里继续执行任务，例如更新视图。

主体活动

private int sizeId = 1;

@Override
public void onClickCheckbox(Integer id) {
    Log.d(TAG, String.valueOf(id));
    sizeId = id;
    // update views if required 
    // Perform any other tasks if required
}