Android 以双窗格模式在listview中维护所选内容

我试图创建一个类似gmail的界面，用户点击左边的列表，然后在右边显示一些东西。我已经到了这样一个地步：我在左边有一个列表，用户可以单击，项目就会突出显示（我是初学者）。问题是，如果用户单击右侧的空白部分，突出显示的项目将不再突出显示

public class profileListFragment extends ListFragment {

    String[] countries = new String[] {"USA", "China"};

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(inflater.getContext(),
                android.R.layout.simple_list_item_1,countries);
        setListAdapter(adapter);
//      View listView = getActivity().findViewById(R.id.list));
        View retView = inflater.inflate(R.layout.fragment_load_profile_list_layout,container, false);
        ListView lv = (ListView) retView.findViewById(android.R.id.list);
        lv.setSelector(android.R.color.holo_orange_light);
        lv.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
//      lv.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

        return retView;
//      return super.onCreateView(inflater, container,  savedInstanceState);
    }

    @Override
    public void onPause(){

    }
}

public class MyAdapter extends BaseAdapter {

    private LayoutInflater mInflater;
    private int mPositionSelected;
    private Context mContext;

    static class MyViewHolder {
        TextView yearMonth;
        TextView number;
    }

    public MyAdapter(Context context) {
        mContext = context;
        mInflater = LayoutInflater.from(context);
    }

    public void setPositionSelected(int positionSelected) {
        mPositionSelected = positionSelected;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        MyViewHolder myViewHolder;

        if (convertView == null) {  // if it's not recycled, initialize some attributes
            convertView = mInflater.inflate(R.layout.my_layout, null);
            myViewHolder = new MyViewHolder();

            myViewHolder.yearMonth = (TextView) convertView.findViewById(R.id.yearMonthInspections);
            myViewHolder.number = (TextView) convertView.findViewById(R.id.numberOfInspections);

            convertView.setTag(myViewHolder);

        } else {
            myViewHolder = (MyViewHolder) convertView.getTag();
        }

        myViewHolder.yearMonth.setText(...);
        myViewHolder.number.setText(...);

        // set background color to the selected position.
        // this is used rotations. The position is maintained here and
        // in the fragment
        if (mPositionSelected == position) {
            convertView.setBackgroundColor(Color.BLUE);
        }

        return convertView;
    }
}

profile_list_selector.xml位于“drawable”文件夹中，如下所示：

lv.setSelector(R.drawable.profile_list_selector);

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >

    <item android:state_enabled="false"
        android:drawable="@android:color/holo_green_dark" />

    <item android:state_pressed="true"
        android:drawable="@android:color/holo_blue_dark" />

    <item android:state_focused="true" android:state_enabled="true"
        android:drawable="@android:color/holo_blue_bright" />

    <item android:state_enabled="true"
        android:drawable="@android:color/holo_orange_dark" />


</selector>

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我现在注意到的是，在右边的屏幕上，只有当我点击右边的文本框时，高亮显示才会消失。。。如果我点击复选框，突出显示的项目将被保留。对这一切完全困惑

不幸的是，目前还没有简单的答案

您必须执行一些类似于自定义适配器的操作，以不同的方式绘制当前选定的项。您还需要跟踪所选项目的状态

有关可能的解决方案，请参阅本博客文章

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这个问题很老了，但我最近遇到了这个问题。我有一个两窗格的平板电脑布局。一个窗格具有项目列表视图，第二个窗格显示第一个窗格中选择的项目。当ListView中的某个项目被选中时，我希望将其标记为选中，并更改第二个窗格。当用户旋转设备时，我希望标记当前选择。以下是我的解决方案：

在我的列表片段中，我保留一个位置。这将保存在SavedInstanceState上，并在onCreate中还原。该位置在单击期间更新，并传递给适配器。在onListItemClick中，我也会相应地更改视图的背景色

public class MyListFragment extends ListFragment {

    private static final String LIST_ITEM_SELECTED = "list_item_selected";

    // keep the item selected to handle rotation
    private int mPositionSelected = 0;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        if (savedInstanceState != null) {
            mPositionSelected = savedInstanceState.getInt(LIST_ITEM_SELECTED, 0);
        }

        mAdapter = new MyAdapter(getActivity());
        mAdapter.setPositionSelected(mPositionSelected);
        setListAdapter(mAdapter);

    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        if (Utils.isTablet(getActivity())) {
            outState.putInt(LIST_ITEM_SELECTED, mPositionSelected);
        }
    }

    @Override
    public void onListItemClick(ListView l, View v, int position, long id) {
    super.onListItemClick(l, v, position, id);
        // If this is a tablet layout the inspections list is visible.
        // so send an event to change them.
        if (Utils.isTablet(getActivity())) {
            // set the old view's bg back to black
            l.getChildAt(mPositionSelected).setBackgroundColor(Color.BLACK);
            // set the selected view's bg
            v.setBackgroundColor(Color.BLUE);
            // keep the selected position
            mPositionSelected = position;
            // tell the adapter the currently selected position
            mInspectionsByMonthAdapter.setPositionSelected(mPositionSelected);
            // let the other fragment know the items it should display
            EventBus.getInstance().post(...);
        } else {
            // else, we need to navigate to a new fragment.
        }
    }

}

在适配器中，我还保持位置处于选中状态。旋转设备时，在getView方法中，所选项目将高亮显示

public class profileListFragment extends ListFragment {

    String[] countries = new String[] {"USA", "China"};

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(inflater.getContext(),
                android.R.layout.simple_list_item_1,countries);
        setListAdapter(adapter);
//      View listView = getActivity().findViewById(R.id.list));
        View retView = inflater.inflate(R.layout.fragment_load_profile_list_layout,container, false);
        ListView lv = (ListView) retView.findViewById(android.R.id.list);
        lv.setSelector(android.R.color.holo_orange_light);
        lv.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
//      lv.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

        return retView;
//      return super.onCreateView(inflater, container,  savedInstanceState);
    }

    @Override
    public void onPause(){

    }
}

public class MyAdapter extends BaseAdapter {

    private LayoutInflater mInflater;
    private int mPositionSelected;
    private Context mContext;

    static class MyViewHolder {
        TextView yearMonth;
        TextView number;
    }

    public MyAdapter(Context context) {
        mContext = context;
        mInflater = LayoutInflater.from(context);
    }

    public void setPositionSelected(int positionSelected) {
        mPositionSelected = positionSelected;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        MyViewHolder myViewHolder;

        if (convertView == null) {  // if it's not recycled, initialize some attributes
            convertView = mInflater.inflate(R.layout.my_layout, null);
            myViewHolder = new MyViewHolder();

            myViewHolder.yearMonth = (TextView) convertView.findViewById(R.id.yearMonthInspections);
            myViewHolder.number = (TextView) convertView.findViewById(R.id.numberOfInspections);

            convertView.setTag(myViewHolder);

        } else {
            myViewHolder = (MyViewHolder) convertView.getTag();
        }

        myViewHolder.yearMonth.setText(...);
        myViewHolder.number.setText(...);

        // set background color to the selected position.
        // this is used rotations. The position is maintained here and
        // in the fragment
        if (mPositionSelected == position) {
            convertView.setBackgroundColor(Color.BLUE);
        }

        return convertView;
    }
}

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我希望这能有所帮助。

它没有被取消选择，只是没有突出显示，我不知道有什么简单的东西，比如keepSelectedHighlightOnFocusChange或类似的东西。我知道的唯一方法是在自定义适配器中自己绘制，这就是我所展示的示例的要点。我看看能不能找到更具体一点的。很快回来…你真是太好了，非常感谢。。。我和一个朋友谈过，他提到了选择器。。。你怎么认为？这就是我现在正在研究的。。