带有开关按钮的 Android 列表视图 - 一次只能激活一个开关

Question

>我有一个带有两个开关的列表视图。我希望该功能在一次只有一个开关可能处于活动状态的情况下正常工作。

--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，我希望另一个开关停用。任何帮助使此功能正常工作将不胜感激。

Answer 1

在您的活动中：-

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;
}
}

在您的适配器中：-

notificationSwitch.setChecked(onOff[position]);

此外，从适配器中删除单击侦听器。

逻辑是：- 将除选定项以外的所有其他值设为 false，然后根据其先前的状态更改选定项的状态。