从RecyclerView删除所有项目 [英] Remove all items from RecyclerView

问题描述

我正在尝试从 onRestart 方法中的 RecyclerView 中删除​​所有元素，以使项目不会两次加载：

I am trying to remove all the elements from my RecyclerView in my onRestart method so the items don't get loaded twice:

@Override
protected void onRestart() {
    super.onRestart();

    // first clear the recycler view so items are not populated twice
    for (int i = 0; i < recyclerAdapter.getSize(); i++) {
        recyclerAdapter.delete(i);
    }

    // then reload the data
    PostCall doPostCall = new PostCall(); // my AsyncTask... 
    doPostCall.execute();
}

但是由于某些原因，删除适配器中创建的$ c>方法无法正常运行：

But for some reason the delete method I created in the adapter is not functioning properly:

>

in RecyclerAdapter.java:

public void delete(int position){
    myList.remove(position);
    notifyItemRemoved(position);
}

public int getSize(){
    return myList.size();
}

我认为列表中的所有其他项目都会被删除，而不是整个列表。

I think every other item in my list gets deleted instead of the entire list.

使用列表视图是如此简单，我简单地称为 adapter.clear（） 。

With a listview it was so easy and I simply called adapter.clear().

有人可以帮我修改代码吗？

Can someone please help me fix up the code?

我认为我应该使用 notifyItemRangeRemoved（...，...）; ，但是我不确定如何使用。 TIA

I think I should be using notifyItemRangeRemoved(...,...); but I am not sure how. TIA

推荐答案

这对我很有用：

This works great for me:

public void clear() {
    int size = data.size();
    if (size > 0) {
        for (int i = 0; i < size; i++) {
            data.remove(0);
        }

        notifyItemRangeRemoved(0, size);
    }
}

来源： https：// github .com / mikepenz / LollipopShowcase / blob / master / app / src / main / java / com / mikepenz / lollipopshowcase / adapter / ApplicationAdapter.java

public void clear() {
    int size = data.size();
    data.clear();
    notifyItemRangeRemoved(0, size);
}

为您：

For you:

@Override
protected void onRestart() {
    super.onRestart();

    // first clear the recycler view so items are not populated twice
    recyclerAdapter.clear();

    // then reload the data
    PostCall doPostCall = new PostCall(); // my AsyncTask... 
    doPostCall.execute();
}

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