day 27

实现购物车的物品删除

这里我是通过顶端toolbar的meun菜单设计点击事件完成的

tool.setOnMenuItemClickListener(new Toolbar.OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem item) {
                switch (item.getItemId()){
                    case R.id.action_kefu:

                        Toast.makeText(mcontext,"客服",Toast.LENGTH_SHORT).show();

                        break;
                    case R.id.action_write:
                        Toast.makeText(mcontext,"编辑！",Toast.LENGTH_SHORT).show();
                        textView.setVisibility(View.GONE);
                        button1.setVisibility(View.GONE);
                        button2.setVisibility(View.VISIBLE);
                        carAdapter.checkAll_None(false);
                        checkBox.setChecked(false);
                        break;
                    case R.id.action_fenxiang:
                        Toast.makeText(mcontext,"完成！",Toast.LENGTH_SHORT).show();
                        textView.setVisibility(View.VISIBLE);
                        button1.setVisibility(View.VISIBLE);
                        button2.setVisibility(View.GONE);
                        carAdapter.checkAll_None(true);
                        checkBox.setChecked(true);
                        break;
                    default:
                        break;
                }
                return false;
            }
        });

这里我是通过布局代码把两个button设置在同一个位置并且把删除字样的button先设置为不可见

<Button
                    android:id="@+id/btn_order"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_alignParentRight="true"
                    android:layout_centerVertical="true"
                    android:minHeight="60dp"
                    android:minWidth="120dp"
                    android:text="去结算"
                    style="@style/bigRedButton"/>


                <Button
                    android:id="@+id/btn_del"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_alignParentRight="true"
                    android:layout_centerVertical="true"
                    android:visibility="gone"
                    android:minHeight="60dp"
                    android:minWidth="120dp"
                    android:text="删除"
                    style="@style/bigRedButton"/>

然后点击编辑后实现去结算按钮不可见，删除可见

功能删除键设置一个点击事件去调用Adapter里的declcart方法

button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                delcart(v);
            }
        });

public void delCart()
    {
        if(!isNull())
            return ;
        for(Iterator iterator = carts.iterator(); iterator.hasNext();)
        {
            ShoppingCart cart = (ShoppingCart) iterator.next();
            if(cart.isChecked())
            {
                int position = carts.indexOf(cart);
                cartProvider.delete(cart);
                iterator.remove();
                notifyItemRemoved(position);
            }
        }
    }