GetChildView 在折叠和展开 ExpandableListView 时得到刷新答案

【问题标题】：GetChildView is getting refreshed on collapsing and expanding ExpandableListViewGetChildView 在折叠和展开 ExpandableListView 时得到刷新
【发布时间】：2019-11-14 04:26:40
【问题描述】：

我已经实现了ExpandableListView，它有 3 个组，每个组包含一个孩子。每个ChildView 都包含一个SwitchCompat

每当我折叠/展开其他组时，都会再次调用 Switch 侦听器。它在未检查的位置被一次又一次地检查。

我还发布了一段代码：

   @Override
public View getChildView(final int groupPosition, final int childPosition,
                         boolean isLastChild, View convertView, ViewGroup parent) {
    try {

        final ViewHolder viewHolder;

        if (convertView == null) {
            // inflate the layout
            LayoutInflater inflater = ((Activity) activity).getLayoutInflater();
            convertView = inflater.inflate(R.layout.link_wallet_item_child, null);

            // well set up the ViewHolder
            viewHolder = new ViewHolder();
            viewHolder.autoPaySwitch = (SwitchCompat) convertView.findViewById(R.id.autoPay_switch);
            viewHolder.textInputEditText = (TextInputEditText) convertView.findViewById(R.id.limit_inputEdittext);
            viewHolder.okTextView = (TextView) convertView.findViewById(R.id.ok_textView);
            viewHolder.limitCheckBox = (CheckBox) convertView.findViewById(R.id.limit_checkBox);

            // store the holder with the view.
            convertView.setTag(viewHolder);

        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }

        Wallet wallet = (Wallet) getChild(groupPosition, childPosition);

        //Switch
        if (wallet.isAutoPay()) {
            viewHolder.autoPaySwitch.setChecked(true);
        } else {
            viewHolder.autoPaySwitch.setChecked(false);
        }
        ....
        viewHolder.autoPaySwitch.setOnCheckedChangeListener
                (new CompoundButton.OnCheckedChangeListener() {
                     @Override
                     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

                         if (InternetConnection.checkConnection(activity)) {
                             new UpdateWalletsAutoPayRequest(activity,
                                     walletList.get(groupPosition).getWalletId().toString(),
                                     isChecked);

                         } else {
                             Toast.makeText(activity, activity.getString(R.string.internet_error),
                                     Toast.LENGTH_SHORT).show();

                             viewHolder.autoPaySwitch.setChecked(!isChecked);
                         }
                     }
                 }
                );
        ...
    } catch (Exception ex) {
        ex.printStackTrace();
    }
    return convertView;
}

以上Listener改变SwitchCompat的状态。希望我能够解释我的问题。提前致谢。

【问题讨论】：

标签： android expandablelistadapter

【解决方案1】：

侦听器再次被调用，因为在getChildView 期间您正在更新它们的值：

// This is triggering the listener that you created previously
if (wallet.isAutoPay()) {
    viewHolder.autoPaySwitch.setChecked(true);
} else {
    viewHolder.autoPaySwitch.setChecked(false);
}

为了解决这个问题，我认为你可以清除监听器（因为你稍后会再次设置它）：

// Clear the listener since you are updating the value but don't need to listen to the callback
viewHolder.autoPaySwitch.setOnCheckedChangeListener(null);
if (wallet.isAutoPay()) {
    viewHolder.autoPaySwitch.setChecked(true);
} else {
    viewHolder.autoPaySwitch.setChecked(false);
}

// Set the listener again as you are already doing
viewHolder.autoPaySwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
     @Override
     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        ...
    }
});

注意：我只是想解决您的问题，因为还有其他方法可以解决。

【讨论】：