带有 ArrayAdapter 的 ListView 未在 Android 11 上显示内容

问题描述

在我们的 android 应用程序中，高级设置显示在正常设置下的自己的列表视图中。默认情况下，仅当事先输入密码时才会填充列表视图。 这一直很好，直到我们在 Android 11 上测试了该应用程序。现在，如果输入密码，列表视图将保持为空。调试显示连接到列表视图的 ArrayAdapter 确实填充了正确的数据。在 Android 10 或更低版本的设备上测试工作正常。

任何进一步调试或查阅 android 迁移指南的尝试都没有结果。有人拍过吗？

XML：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
    
    <View
        style="@style/Divider"
        android:background="@color/BlueDark" />

    <ListView
        android:id="@+id/settings_list_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="0dp"
        android:divider="@color/Blue"
        android:dividerHeight="1dp"></ListView>

    <View
        style="@style/Divider"
        android:background="@color/Blue" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginBottom="4dp"
        android:layout_marginTop="0dp"
        android:orientation="vertical">

        <ListView
            android:id="@+id/advanced_settings_list_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:divider="@color/Green"
            android:dividerHeight="1dp">
        </ListView>
    </LinearLayout>

    <View
        style="@style/Divider"
        android:background="@color/BlueDark" />
</LinearLayout>

ArrayAdapter：

public class Settingslistadapter extends ArrayAdapter<SettingsItemDataModel> {

    // View lookup cache
    private static class ViewHolder {
        TextView txtSettingLabel;
        TextView txtSetting;
    }

    Context mContext;

    public Settingslistadapter(ArrayList<SettingsItemDataModel> data,Context context) {
        super(context,R.layout.row_item,data);
        this.mContext = context;
    }

    @Override
    public View getView(int position,View convertView,ViewGroup parent) {
        // Get the data item for this position
        SettingsItemDataModel dataModel = getItem(position);
        // Check if an existing view is being reused,otherwise inflate the view
        ViewHolder viewHolder; // view lookup cache stored in tag

        if (convertView == null) {

            viewHolder = new ViewHolder();
            LayoutInflater inflater = LayoutInflater.from(getContext());
            convertView = inflater.inflate(R.layout.row_item,parent,false);
            viewHolder.txtSettingLabel = convertView.findViewById(R.id.setting_list_child_label);
            viewHolder.txtSetting = convertView.findViewById(R.id.setting_list_child_setting);

            convertView.setTag(viewHolder);
        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }
        viewHolder.txtSettingLabel.setText(dataModel.getSettingPair()[0]);
        viewHolder.txtSetting.setText(dataModel.getSettingPair()[1]);
        // Return the completed view to render on screen
        return convertView;
    }
}

Activity（仅相关部分。当用户正确输入密码时，updateAdvancedSettings() 被调用）：

private ArrayList<SettingsItemDataModel> settings;
private ListView advancedSettingsListView;
private Settingslistadapter advancedSettingslistadapter;
private ArrayList<SettingsItemDataModel> advancedSettings = new ArrayList<>();

private void setupListViews(View tabView) {

    settings = new ArrayList<>();

    for (SettingsItemDataModel.Identifier key : SettingsService.getInstance().getSettings().keySet()) {

        SettingsItemDataModel chldData = new SettingsItemDataModel(key,SettingsService.getInstance().getSettings().get(key));

        settings.add(chldData);
    }

    ListView settingsListView = tabView.findViewById(R.id.settings_list_view);
    Settingslistadapter settingslistadapter = new Settingslistadapter(settings,context);
    settingsListView.setAdapter(settingslistadapter);
    settingsListView.setonItemClickListener((parent,view,position,id) -> {
        if (!isNavigationLocked()) {
            Object object = parent.getItemAtPosition(position);
            SettingsItemDataModel dataModel = (SettingsItemDataModel) object;
            if (SettingsItemDataModel.Identifier.ADV_SETTINGS.equals(dataModel.getSettingsIdentifier())) {
                showAdvancedSettingsDialog();
            } else if (SettingsItemDataModel.Identifier.LANGUAGE.equals(dataModel.getSettingsIdentifier())) {
                Intent intent = new Intent(Settings.ACTION_LOCALE_SETTINGS);
                startActivity(intent);
            } else if (FASTMODE.equals(dataModel.getSettingsIdentifier())) {
                showInputSettingsRadioDialog(dataModel);
            }
        }
    });

    advancedSettingsListView = tabView.findViewById(R.id.advanced_settings_list_view);
    advancedSettingslistadapter = new Settingslistadapter(advancedSettings,context);
    advancedSettingsListView.setAdapter(advancedSettingslistadapter);
    advancedSettingsListView.setonItemClickListener((parent,id) -> {
        if (!isNavigationLocked()) {
            Object object = parent.getItemAtPosition(position);
            SettingsItemDataModel dataModel = (SettingsItemDataModel) object;

            if (DEL_ALL_MAILS.equals(dataModel.getSettingsIdentifier())) {
                showSimpleSettingsDialog(dataModel);
            } else if (IMG_FILE_TYPE.equals(dataModel.getSettingsIdentifier())) {
                showInputSettingsRadioDialog(dataModel);
            } else if (IMG_COMP_LEV.equals(dataModel.getSettingsIdentifier())) {
                showInputSettingsSeekBarDialog(dataModel);
            } else if (SWIPE.equals(dataModel.getSettingsIdentifier())) {
                showInputSettingsRadioDialog(dataModel);
            } else if (ZIP_COMP_TYPE.equals(dataModel.getSettingsIdentifier())) {
                showInputSettingsRadioDialog(dataModel);
            } else if (ZIP_COMP_LEV.equals(dataModel.getSettingsIdentifier())) {
                showInputSettingsspinnerDialog(dataModel);
            } else {
                showInputSettingsDialog(dataModel);
            }
        }
    });
    settingsListView.invalidate();
    advancedSettingsListView.invalidate();
}

public void updateAdvancedSettings() {

    advancedSettings.clear();

    LinkedHashMap<SettingsItemDataModel.Identifier,String[]> advSettingData = null;
    advSettingData = SettingsService.getInstance().getAdvancedSettings();

    for (SettingsItemDataModel.Identifier key : advSettingData.keySet()) {

        SettingsItemDataModel chldData = new SettingsItemDataModel(key,advSettingData.get(key));

        advancedSettings.add(chldData);
    }
    try {
        SettingsService.getInstance().saveExtAdvancedSetting();
    } catch (IOException e) {
        e.printstacktrace();
    }
}

解决方法

答案很简单。我得打电话

advancedSettingsListAdapter.notifyDataSetChanged();

在我填充适配器后手动执行。无论出于何种原因，这似乎是从以前版本的操作系统自动完成的。