在RecyclerView顶部设置进度条，并在加载数据后删除 [英] Set progress bar on top of RecyclerView and remove after data is loaded

问题描述

我希望有一个加载图标显示在RecyclerView的顶部，并在数据加载完成后消失

I want to have a loading icon that is displayed on top of where a RecyclerView would be, and disappear once the data is finished loading

它看起来像:

有人可以帮我吗?

我有代码，在RecyclerView上方显示了一个TextView，上面显示正在加载..."，并且在加载数据后消失，但是RecyclerView仍然可见.

I have the code which shows a TextView above the RecyclerView that says "Loading..." and disappears after the data is loaded, but the RecyclerView is still visible.

我的XML:

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/loaderTV"
    android:text="Loading..."
    android:layout_above="@+id/eventListRV"/>

<android.support.v7.widget.RecyclerView
    android:scrollbars="vertical"
    android:id="@+id/eventListRV"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_below="@+id/spinner">



    </android.support.v7.widget.RecyclerView>

然后在我的代码中

client.listCreators(request, new Callback<ServiceResponse<Event>>() {
            @Override
            public void success(ServiceResponse<Event> eventServiceResponse, Response response) {
                eventList.addAll(eventServiceResponse.data.results);
                Log.i("tag", String.valueOf(eventServiceResponse.data.total));

                if (eventList.size() > 60) {
                    adapter.notifyDataSetChanged();
                    loadingText.setVisibility(View.GONE);
                }
            }

但是我希望在加载数据时看不到RecyclerView，并且我希望RecyclerView所在位置的进度条，并且我不希望它成为textview

But I want the RecyclerView to be invisible while the data is loading and I want the progress bar ontop of where the RecyclerView is, and I don't want it to be a textview

推荐答案

1. 将RecyclerView和加载布局(或TextView)都包装在FrameLayout中.然后将两者的宽度和高度都设置为match_parent.
2. 将RecyclerView隐藏在活动的onCreate()或片段的onCreateView()中:recyclerView.setVisibility(View.GONE);
3. 在回调方法中，使用setVisibility(View.GONE)隐藏加载布局，使用setVisibility(View.VISIBLE)显示RecyclerView并使用adapter.notifyDataSetChanged()
触发适配器的重新加载.

1. Wrap both your RecyclerView and your loading layout (or TextView) inside a FrameLayout. Set both of then to match_parent for width and height.
2. Hide the RecyclerView in the onCreate() of your activity or onCreateView() of your fragment: recyclerView.setVisibility(View.GONE);
3. In your callback method hide the loading layout with setVisibility(View.GONE), show your RecyclerView with setVisibility(View.VISIBLE) and trigger a reload of the adapter with adapter.notifyDataSetChanged()

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