java - 如何从 fragment 中的RecyclerView获取有关复选框的信息

Question

我需要从 recyclerView 获取有关项目的信息。我尝试做类似的事情来进入，但这没有用，有什么想法吗？我认为调用 CheckBox 是没有用的，我不需要它。但现在我不知道该怎么做。

private void handlerForChannels() {
    list = ChannelsManager.getInstance().getChannelList();
    mAdapter = new SettingsCustomAdapter(context, posit, list);
    verticalGridView.setAdapter(mAdapter);
    textView.setText(R.string.title_channels);
    button.setText(R.string.select_all);
    final SparseBooleanArray mChecked = new SparseBooleanArray();

    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            mAdapter.getItemViewType(SETTINGS_CHANNELS);
            mAdapter.getItemId(getId());
            CheckBox cb;
            int count = list.size();
            cb = (CheckBox) view.findViewById(R.id.checkBox_for_recycle);
            for (int i = 0; i < count; i++) {
                mChecked.put(i, cb.isChecked());
            }


            mAdapter.notifyDataSetChanged();

        }
    });
    button.setNextFocusLeftId(R.id.select_all);
    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

        }
    });
    button1.setText(R.string.cancel_text);
    button1.setNextFocusLeftId(R.id.select_all);
    button1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            ((MainActivity) activity).closeSettingsDrawerFragment();
        }
    });
    button2.setText(R.string.ok_text);
    button2.setNextFocusLeftId(R.id.ok_button);
    button2.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

        }
    });
}

Answer 1

使用 boolean 值将新数组添加到适配器中，以设置复选框 true 或 false:

    //...
    public ArrayList<Boolean> checkBoxesState;
    //...

    public mAdapter(Context context, ArrayList<String> posit, ArrayList<String> list, ArrayList<Boolean> checkBoxesState /* <- add this one*/) {
        //...
        this.checkBoxesState = checkBoxesState;
    }

比您设置的是否检查它们:

    @Override
    public void onBindViewHolder(final NotaViewHolder viewHolder, final int position) {

        //...
        viewHolder.checkBox.setChecked(checkBoxesState.get(position));
    }

现在您可能已经知道如何检查它们，但对于那些也遇到这种情况的人，方法如下:

    //create adapter
    mAdapter = new mAdapter(context, posit, list, checkBoxesStates /* <- fill with false booleans */ );
    recyclerView.setAdapter(mAdapter);

    //check them all
    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            for (int i = 0; i <= mAdapter.getItemCount(); i++) {
                checkBoxesStates.add(i, true);
                mAdapter.notifyItemChanged(0); //this updates the adapter
            }
        }
    });

编辑:

您必须在 ViewHolder 中创建复选框，如下所示:

        public class NotaViewHolder extends RecyclerView.ViewHolder {

        //...
        CheckBox checkBox;


        public NotaViewHolder(final View itemView) {
            super(itemView);

            //...

            checkBox = (CheckBox) itemView.findViewById(R.id.rowCheckBox);

            //...
        }
    }