Question

在我的Android TV应用中，ActionsRow中的操作按钮忽略了

adapter.notifyArrayItemRangeChanged(0, 1);

呼叫。我正在使用：

View focusedView = getActivity().getCurrentFocus();

获取焦点视图，但无法在 notifyArrayItemRangeChanged 之后重新设置焦点。在 notifyArrayItemRangeChanged 之前具有焦点的按钮失去焦点，我无法在 onBindViewHolder 中（或之后）创建该按钮 requestFocus ActionPresenter 或 ActionsRowPresenter 的 onBindRowViewHolder ...每次在 notifyArrayItemRangeChanged 之后，焦点都会设置为第一个按钮。

如何保留焦点或如何将其设置回原始视图？

ActionPresenter：

@Override
public void onBindViewHolder(Presenter.ViewHolder viewHolder, Object item) {
    Log.i(TAG, "onBindViewHolder called, item:" + item.toString());
    Action action = (Action) item;
    ActionViewHolder vh = (ActionViewHolder) viewHolder;
    vh.mAction = action;
    vh.mButton.setText(action.getLabel1());
    vh.mButton.setTag(action.getId());

    vh.mButton.requestFocus();
}

的 ActionsRowPresenter ：

    protected void onBindRowViewHolder(ActionsRowPresenter.ViewHolder holder, Object item) {
    super.onBindRowViewHolder(holder, item);
    Log.i(TAG, "onBindRowViewHolder called");

    ViewHolder vh = holder;
    ActionsRow row = (ActionsRow) vh.getRow();

    ArrayObjectAdapter aoa = new ArrayObjectAdapter(mActionPresenter);
    aoa.addAll(0, (Collection)row.getActions());
    vh.bind(aoa);
}

和 NowPlayingChannelRowPresenter ：

public NowPlayingChannelRowPresenter(Channel c) {
    setHeaderPresenter(null);
    setSelectEffectEnabled(false);

    mSelectedChannel = c;

    npcdrPresenter = new NowPlayingChannelDetailsRowPresenter(new DetailsDescriptionPresenter());
    actionsRowPresenter = new ActionsRowPresenter();

    ClassPresenterSelector ps = new ClassPresenterSelector();

    ps.addClassPresenter(NowPlayingChannelDetailsRow.class, npcdrPresenter);
    ps.addClassPresenter(ActionsRow.class, actionsRowPresenter);

    npcdRow = new NowPlayingChannelDetailsRow(mSelectedChannel);

    actionsRow = new ActionsRow(mSelectedChannel);

    actionsRow.addAction(new Action(ACTION_START_STOP, "Stop"));
    actionsRow.addAction(new Action(ACTION_ADD_REMOVE_FAVORITE, "Add to Favorites"));

}


@Override
protected RowPresenter.ViewHolder createRowViewHolder(ViewGroup parent) {
    View v = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.now_playing_channel_row, parent, false);
    ViewHolder vh = new ViewHolder(v);

    vh.mNpcdVh = (NowPlayingChannelDetailsRowPresenter.ViewHolder) npcdrPresenter.onCreateViewHolder(vh.llNpcd);
    vh.llNpcd.addView(vh.mNpcdVh.view);

    vh.mActionsVh = (ActionsRowPresenter.ViewHolder) actionsRowPresenter.onCreateViewHolder(vh.llActions);
    vh.llActions.addView(vh.mActionsVh.view);

    return vh;
}


@Override
protected void onBindRowViewHolder(RowPresenter.ViewHolder holder, Object item) {
    super.onBindRowViewHolder(holder, item);

    ViewHolder vh = (ViewHolder) holder;
    npcdrPresenter.onBindRowViewHolder(vh.mNpcdVh, npcdRow);
    actionsRowPresenter.onBindRowViewHolder(vh.mActionsVh, actionsRow);

}

编辑1：没有ListView，我正在使用带有自定义演示者的ArrayObjectAdapter实例

编辑2：我附加了布局视图（Hiearchy View）。

enter image description here

Answer 1

如果listview延长Activity，请尝试：

listviewName.setSelection(positionOfItem);

如果您的listview延伸ListActivity，请尝试：

getListView().setSelection(positionOfItem);

即使在listView更新后，它也将专注于特定位置。

Answer 2

只应为需要关注的项目调用

vh.mButton.requestFocus（）;

如果只是为ActionPresenter中的第一个项目通知适配器，则仅为第一个项目调用onBindViewHolder，它将获得焦点。

如果是需要关注的第二个项目，则应该为该项目调用ActionPresenter的onBindViewHolder，您应该只请求第二个项目而不是所有项目。

焦点是在adapter.notifyArrayItemRangeChanged上迷失

2 个答案: