带有开关按钮的 Android ListView - 一次只有一个开关处于活动状态

Question

我有一个带有两个开关的列表视图。如果一次只能激活一个开关，我希望该功能能够正常工作。

--更新

我的适配器：

 public class NotificationsAdapter extends ArrayAdapter<String> {

private Context context;
private String mTitle[];
private boolean onOff[];

public NotificationsAdapter(Context c, String mTitle[], boolean onOff[])   {
    super(c, R.layout.adapter_notifications_layout, R.id.notificationsListTv, mTitle);
    this.context = c;
    this.mTitle = mTitle;
    this.onOff = onOff;
}

@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
  LayoutInflater layoutInflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View view = layoutInflater.inflate(R.layout.adapter_notifications_layout, parent, false);

    Switch notificationSwitch = view.findViewById(R.id.switchNotificationsDaily);
    TextView myTitle = view.findViewById(R.id.notificationsListTv);

    myTitle.setText(mTitle[position]);
    notificationSwitch.setChecked(onOff[position]);

    view.setClickable(true);
    view.setFocusable(true);
    view.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {

            int size = onOff.length;
            for (int i = 0; i < size; i++) {
                if (i == position) {
                    break;
                }
                onOff[i] = false;
            }

            if (onOff[position]) {
                notificationSwitch.setChecked(false);
                onOff[position] = false;
            } else {
                onOff[position] = true;
                notificationSwitch.setChecked(true);
            }
        }

    });

    return view;
}

我的班级：

   private String[] mTitle = new String[]{"Once Daily", "Twice Daily"};
   private Switch notificationSwitch;
   private boolean[] onOff = new boolean[] {false, false};


     NotificationsAdapter notificationsAdapter = new NotificationsAdapter(getActivity(), mTitle, onOff);
    listView = view.findViewById(R.id.notificationsListView);
    listView.setAdapter(notificationsAdapter);
    listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
    listView.setItemsCanFocus(true);

    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

        }
    });
  }

目前使用此代码，我可以选择两个开关同时处于活动状态。当我选择多个开关时，我希望另一个关闭。任何帮助使此功能正常工作将不胜感激。

Answer 1

在你的活动中：-

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

        resetValues(position);

        if (onOff[position]) {
            onOff[position] = false;
        } else {
            onOff[position] = true;
        }
        notifyDataSetChanged();
    }
}

private void resetValues(int selectedPosition){
    int size = onOff.length;
    for(int i=0; i < size; i++){
        if(i == selectedPosition){
           continue;
        }
        onOff[i] = false;
    }
}

在你的适配器中：-

notificationSwitch.setChecked(onOff[position]);

另外，从适配器中删除您的点击侦听器。

逻辑是：- 将除选中项之外的所有其他值设为假，然后根据其先前状态更改选中项的状态。