ViewHolder views must not be attached when created. Ensure that you are not passing 'true' to the at

妖狐艹你老母 2022-05-12 13:34 258阅读 0赞

如果在使用Recyclerview的时候出现下面的异常

###### ViewHolder views must not be attached when created. Ensure that you are not passing ‘true’ to the attachToRoot parameter of LayoutInflate ######

这说明onCreateViewHolder 方法写错了  
这句话的意思是，viewHolder不予许在创建的时候添加到parent里，所以如果在onCreateViewHolder方法里使用：

// View view = inflater.inflate(R.layout.item\_view, parent, true);或者  
// View view = inflater.inflate(R.layout.item\_view, parent);

就会报错n: ViewHolder views must not be attached when created. Ensure that you are not passing ‘true’ to the attachToRoot parameter of LayoutInflate

只要改成：  
// View view = inflater.inflate(R.layout.item\_view, null); 或者  
// View view = inflater.inflate(R.layout.item\_view, parent, false);  
即可

那么这三个参数是什么意思呢？

public View inflate(@LayoutRes int resource, @Nullable ViewGroup root, boolean attachToRoot)

第一个参数是传入的布局参数  
第二个参数是这个布局的父布局  
第三个就是是否要将这个布局加载到父布局里

##### 1、如果root为null，那么第三个参数传入true和false都无影响，因为当root为null的时候就用不到attachToRoot参数，这个布局的最外层参数也就没有效果了。 #####

##### 2、如果root不为null #####

##### 2.1 attachToRoot = true，布局的最外层属性会生效并且会添加到root中,返回的view是父布局 #####

View result = root;
            return result;

##### 2.2 attachToRoot = false，布局会添加到root中,当布局被添加到root中的时候,布局的最外层属性会生效。返回的view是resource指定的布局 #####

if (root == null || !attachToRoot) { 
    			result = temp;
    		}
    		return result;

完毕(\#^ . ^\#)

ViewHolder views must not be attached when created. Ensure that you are not passing 'true' to the at

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