使用ItemTouchHelper.SimpleCallback禁用在RecyclerView中的位置滑动 [英] Disable Swipe for position in RecyclerView using ItemTouchHelper.SimpleCallback

问题描述

我正在使用recyclerview 22.2.0和帮助程序类ItemTouchHelper.SimpleCallback启用对我的列表的滑动到关闭选项.但是，由于上面有一种标头，因此我需要为适配器的第一个位置禁用滑动行为.由于 RecyclerView.Adapter 没有 isEnabled()方法，因此我尝试通过 isEnabled()和 isFocusable()，但没有成功.我尝试将滑动阈值调整为完整值，例如SimpleCallback的方法 getSwipeThreshold()中的 0f 或 1f ，但也没有成功.

I am using recyclerview 22.2.0 and the helper class ItemTouchHelper.SimpleCallback to enable swipe-to-dismiss option to my list. But as I have a type of header on it, I need to disable the swipe behavior for the first position of the adapter. As RecyclerView.Adapter doesn't have a isEnabled() method, I tried to disable the view interaction through the methods isEnabled() and isFocusable() in the ViewHolder creation itself, but had no success. I tried to adjust the swipe threshold to a full value, like 0f ot 1f in the SimpleCallback's method getSwipeThreshold(), but no success too.

我的代码的一些片段可以帮助您.

Some fragments of my code to help you to help me.

我的活动:

@Override
protected void onCreate(Bundle bundle) {
    //... initialization
    ItemTouchHelper.SimpleCallback simpleItemTouchCallback = new ItemTouchHelper.SimpleCallback(0,
            ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT) {

        @Override
        public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder,
                          RecyclerView.ViewHolder target) {
            return false;
        }

        @Override
        public float getSwipeThreshold(RecyclerView.ViewHolder viewHolder) {
            if (viewHolder instanceof CartAdapter.MyViewHolder) return 1f;
            return super.getSwipeThreshold(viewHolder);
        }

        @Override
        public void onSwiped(RecyclerView.ViewHolder viewHolder, int swipeDir) {

        }
    };

    ItemTouchHelper itemTouchHelper = new ItemTouchHelper(simpleItemTouchCallback);
    itemTouchHelper.attachToRecyclerView(recyclerView);
}

我有一个通用适配器，具有两种视图类型.在要禁用滑动的 ViewHolder 中，我做了:

And I have a common adapter with two view types. In the ViewHolder that I want to disable swiping, I did:

public static class MyViewHolder extends RecyclerView.ViewHolder {
    public ViewGroup mContainer;

    public MyViewHolder(View v) {
        super(v);
        v.setFocusable(false);
        v.setEnabled(false);
        mContainer = (ViewGroup) v.findViewById(R.id.container);      
    }
}

推荐答案

稍作播放后，我设法确保 SimpleCallback 具有名为 getSwipeDirs()的方法.由于我为不可滑动位置使用了特定的ViewHolder，因此可以使用 instanceof 来避免滑动.如果不是您这种情况，则可以使用ViewHolder在适配器中的位置来执行此控制.

After playing a bit, I managed that SimpleCallback has a method called getSwipeDirs(). As I have a specific ViewHolder for the not swipable position, I can make use of instanceof to avoid the swipe. If that's not your case, you can perform this control using the position of ViewHolder in the Adapter.

Java

@Override
public int getSwipeDirs(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
    if (viewHolder instanceof CartAdapter.MyViewHolder) return 0;
    return super.getSwipeDirs(recyclerView, viewHolder);
}

科特林

override fun getSwipeDirs (recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder): Int {
    if (viewHolder is CartAdapter.MyViewHolder) return 0
    return super.getSwipeDirs(recyclerView, viewHolder)
}

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