android– 如何实现两级DrawerLayout

概述我正在尝试实现两级DrawerLayout.作为基线,我正在使用http://developer.android.comraining/implementing-navigationav-drawer.html的Google行星示例.所以我想扩展这个例子,这样从行星列表中选择一个行星,用行星上的城市列表替换行星列表(除了地球以外大多空白–我仍在充实

我正在尝试实现两级DrawerLayout.作为基线,我正在使用http://developer.android.com/training/implementing-navigation/nav-drawer.html的Google行星示例.所以我想扩展这个例子,这样从行星列表中选择一个行星,用行星上的城市列表替换行星列表(除了地球以外大多空白 – 我仍在充实我的数据： – )).

我想我可以采取三种方法： –

>替换ListVIEw
>保留ListVIEw,但替换其ArrayAdapter
>保留ListVIEw和ArrayAdapter,但替换适配器的数据

所以尝试选项3(这是最好的方法吗？),在我的DrawerItemClickListener中,我执行以下 *** 作…

arrayAdapter.clear(); arrayAdapter.addAll(arraylistofCitIEs);arrayAdapter.notifyDataSetChanged(); mDrawerList.invalIDateVIEws();mDrawerList.forceLayout();mDrawerList.refreshDrawableState();

但它似乎没有用,即行星列表不会被城市列表所取代.

我的方法是否正确？如果是,我如何让列表刷新？

解决方法:

Replace the ListVIEw

真的没有必要.

Keep the ListVIEw, but replace its ArrayAdapter

这将是最容易实现的.首先,将以下字符串数组(城市名称)添加到res / values / strings.xml：

<string-array name="mercury_array">    <item>Undiscovered City 1 (Mercury)</item>    <item>Undiscovered City 2 (Mercury)</item>    <item>Undiscovered City 3 (Mercury)</item>    <item>Undiscovered City 4 (Mercury)</item></string-array><string-array name="venus_array">    <item>Undiscovered City 1 (Venus)</item>    <item>Undiscovered City 2 (Venus)</item>    <item>Undiscovered City 3 (Venus)</item>    <item>Undiscovered City 4 (Venus)</item></string-array><string-array name="earth_array">    <item>New York</item>    <item>Hong Kong</item>    <item>New Delhi</item>    <item>London</item></string-array><string-array name="mars_array">    <item>Undiscovered City 1 (Mars)</item>    <item>Undiscovered City 2 (Mars)</item>    <item>Undiscovered City 3 (Mars)</item>    <item>Undiscovered City 4 (Mars)</item></string-array><string-array name="jupiter_array">    <item>Undiscovered City 1 (Jupiter)</item>    <item>Undiscovered City 2 (Jupiter)</item>    <item>Undiscovered City 3 (Jupiter)</item>    <item>Undiscovered City 4 (Jupiter)</item></string-array><string-array name="saturn_array">    <item>Undiscovered City 1 (Saturn)</item>    <item>Undiscovered City 2 (Saturn)</item>    <item>Undiscovered City 3 (Saturn)</item>    <item>Undiscovered City 4 (Saturn)</item></string-array><string-array name="uranus_array">    <item>Undiscovered City 1 (Uranus)</item>    <item>Undiscovered City 2 (Uranus)</item>    <item>Undiscovered City 3 (Uranus)</item>    <item>Undiscovered City 4 (Uranus)</item></string-array><string-array name="neptune_array">    <item>Undiscovered City 1 (Neptune)</item>    <item>Undiscovered City 2 (Neptune)</item>    <item>Undiscovered City 3 (Neptune)</item>    <item>Undiscovered City 4 (Neptune)</item></string-array>

在MainActivity中创建方法loadContentList(int).这是在主菜单点击项目时调用的方法：

private voID loadContentList(int position) {    setTitle(mPlanetTitles[position]);    String[] content;    switch(position) {    case 0:            content = getResources().getStringArray(R.array.mercury_array);            break;    case 1:            content = getResources().getStringArray(R.array.venus_array);            break;    case 2:            content = getResources().getStringArray(R.array.earth_array);            break;    case 3:            content = getResources().getStringArray(R.array.mars_array);            break;    case 4:            content = getResources().getStringArray(R.array.jupiter_array);            break;    case 5:            content = getResources().getStringArray(R.array.saturn_array);            break;    case 6:            content = getResources().getStringArray(R.array.uranus_array);            break;    case 7:            content = getResources().getStringArray(R.array.neptune_array);            break;    default:            content = getResources().getStringArray(R.array.neptune_array);     }    // Change ListVIEw's adapter        mDrawerList.setAdapter(new ArrayAdapter<String>(this,            R.layout.drawer_List_item, content));    // Change OnItemClickListener // CityItemClickListener is defined below    mDrawerList.setonItemClickListener(new CityItemClickListener());}

由于我们想要在点击行星项目时更新ListVIEw,我们将更改DrawerItemClickListener的方法体并调用新添加的loadContentList(int)：

/* The click Listner for ListVIEw in the navigation drawer */private class DrawerItemClickListener implements ListVIEw.OnItemClickListener {    @OverrIDe    public voID onItemClick(AdapterVIEw<?> parent, VIEw vIEw, int position, long ID) {        //selectItem(position);        loadContentList(position);    }}

单击一个城市时,我们将需要另一个OnItemClickListener来更改片段. ：

private class CityItemClickListener implements ListVIEw.OnItemClickListener {    @OverrIDe    public voID onItemClick(AdapterVIEw<?> parent, VIEw vIEw, int position, long ID) {        // This is the method that was being called on planet click         // in the original example. Implementation of it is up to you        selectItem(position);    }}

Keep the ListVIEw and the ArrayAdapter, but replace the adapter’s data

定义ArrayAdapter：

private ListVIEw mDrawerList;private ActionbarDrawerToggle mDrawerToggle;    ---------> private ArrayAdapter<String> mAdapter;     

在MainActivity的onCreate(Bundle)中：

ArrayList<String> planetList = new ArrayList<String>();planetList.addAll(Arrays.asList(mPlanetTitles));mAdapter = new ArrayAdapter<String>(this,            R.layout.drawer_List_item, planetList);// set up the drawer's List vIEw with itemsmDrawerList.setAdapter(mAdapter);      

调用mAdapter.clear()时,我们必须传递一个ArrayList以避免UnsupportedOperationException.

将loadContentList(int)更改为以下内容：

private voID loadContentList2(int position) {    setTitle(mPlanetTitles[position]);    String[] content;    switch(position) {        ....        ....    }    ArrayList<String> cityList = new ArrayList<String>();    cityList.addAll(Arrays.asList(content));    mAdapter.clear();    mAdapter.addAll(cityList);    // update    mAdapter.notifyDataSetChanged();            // Change on item click Listener    mDrawerList.setonItemClickListener(new CityItemClickListener());}

CityItemClickListener和DrawerItemClickListener将保持原样.唯一的变化是：我们没有在行星列表项目上创建新的ArrayAdapter点击.

您需要找出一种方法(可能是一个按钮),以便用户从城市视图返回到行星列表.

我还建议您查看ExpandableListVIEw.它可以更优雅地解决您的问题.

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