因此,一切都在智能手机上运行良好。但是,在平板电脑上,myListView
应该显示为左侧导航元素,当前激活的项目在详细信息片段中显示为展开。这也很有效。但是, 的已ListFragment
激活项目不会显示为选中状态。我已经设置android:choiceMode
为singleChoice
. 我已经激活了正确的选择器,并且在按下项目时会出现背景可绘制对象。选择器有正确的项目android:state_activated="true"
。我android:activatedBackgroundIndicator
在我的styles.xml文件中指定。当我记录它listView.getCheckedItemCount()
内部的输出时,它会像我期望的那样onListItemClick
给我回报。1
曾几何时,几周前ArrayAdapter
,在我开始真正连接我的数据源之前,在我开始使用自定义列表视图项布局之前,我什至让这一切都完全按照预期工作。然后在途中的某个地方,我做了一些使激活的项目显示不正确的事情,但我不确定它是什么。
selectable_background.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android"
android:exitFadeDuration="@android:integer/config_mediumAnimTime" >
<item android:state_pressed="false" android:state_focused="true" android:drawable="@drawable/list_focused" />
<item android:state_pressed="true" android:drawable="@drawable/pressed_background" />
<!-- selected -->
<item android:state_activated="true" android:drawable="@drawable/pressed_background" />
<item android:state_checked="true" android:drawable="@drawable/pressed_background" /> <!-- paranoia -->
<item android:state_selected="true" android:drawable="@drawable/pressed_background" /> <!-- paranoia -->
<!-- default -->
<item android:drawable="@android:color/transparent" />
</selector>
片段列表.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ListView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@id/android:list"
android:layout_width="match_parent"
android:layout_height="0dip"
android:layout_weight="1"
android:choiceMode="singleChoice"
android:listSelector="@drawable/selectable_background" >
</ListView>
<TextView android:id="@id/android:empty"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="16dp"
android:paddingBottom="16dp"
android:paddingLeft="12dp"
android:paddingRight="12dp"
android:text="@string/empty_list" />
</LinearLayout>
list_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<ImageView android:id="@+id/item_image"
android:layout_width="63dp"
android:layout_height="63dp"
android:contentDescription="@string/list_image"
android:src="@drawable/ic_thumbnail_placeholder"
android:background="#f0f0f0" />
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/item_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceListItemSmall"
android:gravity="center_vertical"
android:paddingLeft="?android:attr/listPreferredItemPaddingLeft"
android:paddingRight="?android:attr/listPreferredItemPaddingRight"
android:minHeight="?android:attr/listPreferredItemHeightSmall" />
</LinearLayout>
MyListFragment.java
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.getActivity().getLoaderManager().initLoader(ALL_ITEMS_LOADER, null, this);
listAdapter = new SimpleCursorAdapter(
this.getActivity(),
R.layout.list_item,
null,
new String[] { Item.NAME },
new int[] { R.id.item_name },
CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER
);
this.setListAdapter(listAdapter);
}
@Override
public Loader<Cursor> onCreateLoader(int i, Bundle bundle) {
Uri queryUri;
switch (i) {
case ALL_ITEMS_LOADER:
queryUri = Item.CONTENT_URI;
return new CursorLoader(this.getActivity(), queryUri, null, null, null, null);
default:
throw new IllegalArgumentException("Unknown loader ID: " + i);
}
}
@Override
public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor cursor) {
if (listAdapter == null) {
throw new IllegalStateException("List adapter is missing!");
} else {
Log.d(TAG, "Load finished. Cursor swapped.");
listAdapter.swapCursor(cursor);
}
}
更新:
我还尝试用SimpleCursorAdapter
我ArrayAdapter
以前工作过的替换,但没有骰子:
listAdapter = new ArrayAdapter<String>(
this.getActivity(),
R.layout.list_item,
R.id.item_name,
new String[] {"1", "2", "3"}
);
更新 2:
啊啊!线索!
listAdapter = new ArrayAdapter<String>(
this.getActivity(),
android.R.layout.simple_list_item_activated_1,
android.R.id.text1,
new String[] {"1", "2", "3"}
);
这行得通。但由于我实际上需要使用自己的布局,它并不能解决我自己的问题。R.layout.list_item
和之间有什么不同android.R.layout.simple_list_item_activated_1
?