Question

我有一个CardViews的RecyclerView列表，我正在使用AppCompatActivity。每个CardView都有一个复选框。当我点击复选框时，我想启动一个Contextual Action Bar。我想使用OnCheckedChangeListener并且没有运气。当＆＃34; chkSelected＆＃34;正确地显示复选标记。单击复选框，再次单击＆＃34; chkSelected时，它将变为不可见。我在这里缺少什么？

public class MyRecylerAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
    ...    
    private static ActionMode.Callback actionModeCallback = new ActionMode.Callback() {
        @Override
        public boolean onCreateActionMode(ActionMode mode, Menu menu) {
            return false;
        }
        @Override
        public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
            return false;
        }
        @Override
        public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
            return false;
        }
        @Override
        public void onDestroyActionMode(ActionMode mode) {
        }
    };
    ...
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_contact_item, parent, false);
        final ItemHolder itemHolder = new ItemHolder(view);

        return itemHolder;
    }

    private static class ItemHolder extends RecyclerView.ViewHolder {

        private CheckBox chkSelected;

        private ItemHolder(View itemView) {
            super(itemView);

            chkSelected = (CheckBox) itemView.findViewById(R.id.chkSelected);

            chkSelected.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
                @Override
                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                    if (isChecked)
                      mActionMode = ((AppCompatActivity) buttonView.getContext()).startSupportActionMode(actionModeCallback);
                }
            }); 
}

我还在ItemHolder（）中尝试了OnClickListener（）而没有运气。代码如下。 onClick（）中的toast正确显示，因此startSupportActionMode（）必定有问题。

chkSelected.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(view.getContext(),"Checkbox was clicked",Toast.LENGTH_LONG).show();
                if(mActionMode == null) {
                    // Start the Contextual Action Bar (CAB) using the ActionMode.Callback defined above
                    mActionMode = ((AppCompatActivity) view.getContext()).startSupportActionMode(mActionModeCallback);
                }
            }
        });

Answer 1

解决方案是在segments中设置一个方法，用于更新onBindViewHolder()中OnClickListeners的项目视图。

RecyclerView：如何使用Checkbox启动Contextual Action Bar CAB？

1 个答案: