dom*_*omi 42 android android-layout android-listview android-linearlayout
我只有一个活动是ListActivity.基本上我使用以下代码剪切来"激活"CAB:
ListView listView = getListView();
listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL);
listView.setMultiChoiceModeListener(new MultiChoiceModeListener() {
@Override
public void onItemCheckedStateChanged(ActionMode mode, int position,
long id, boolean checked) {
// Here you can do something when items are selected/de-selected,
// such as update the title in the CAB
}
@Override
public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
// Respond to clicks on the actions in the CAB
switch (item.getItemId()) {
case R.id.menu_delete:
deleteSelectedItems();
mode.finish(); // Action picked, so close the CAB
return true;
default:
return false;
}
}
@Override
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
// Inflate the menu for the CAB
MenuInflater inflater = mode.getMenuInflater();
inflater.inflate(R.menu.context, menu);
return true;
}
@Override
public void onDestroyActionMode(ActionMode mode) {
// Here you can make any necessary updates to the activity when
// the CAB is removed. By default, selected items are deselected/unchecked.
}
@Override
public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
// Here you can perform updates to the CAB due to
// an invalidate() request
return false;
}
});
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列表的布局:
<ImageView
android:id="@+id/message_on_clipboard_icon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:minWidth="30dp"
android:padding="7sp"
android:src="@android:drawable/presence_online" >
</ImageView>
<LinearLayout
android:id="@+id/linearLayout2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/listitem_background"
android:orientation="vertical" >
<TextView
android:id="@+id/message"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginRight="5sp"
android:fadingEdge="horizontal"
android:singleLine="true"
android:text="TextView"
android:textAppearance="?android:attr/textAppearanceLarge" >
</TextView>
<LinearLayout
android:id="@+id/linearLayout1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/listitem_background"
android:orientation="horizontal" >
<TextView
android:id="@+id/message_length"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="5sp"
android:text="@string/message_length"
android:textAppearance="?android:attr/textAppearanceSmall" >
</TextView>
<TextView
android:id="@+id/message_count"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="5sp"
android:text="TextView"
android:textAppearance="?android:attr/textAppearanceSmall" >
</TextView>
<TextView
android:id="@+id/date_label"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="5sp"
android:text="@string/date_label" >
</TextView>
<TextView
android:id="@+id/date_message"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" >
</TextView>
</LinearLayout>
</LinearLayout>
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在main.xml中:
<ListView
android:id="@+android:id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
</ListView>
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现在,如果我长按一下列表项,CAB就会按预期显示:
我使用MultiChoiceModeListener但不幸的是,所选列表项不会像这里的示例那样更改背景(选择项目后的浅蓝色背景):
我必须使用自定义选择器吗?或者是否有一个标准的程序,android如何处理这个,我只需要让我的LinearLayouts透明?我也试过以下但没有成功:
如果有人能指出我正确的方向,那就太棒了.如果您需要更多应用程序代码或xml文件,请告诉我.
Ale*_*cas 53
我只在CHOICE_MODE_SINGLE中对此进行过测试,但在这种情况下,它可以通过执行以下操作来实现.
当您选择列表项时,在代码中,为列表中的该项调用"setItemChecked(position,checked)"方法(在ListView实例上).
将其添加到单个ListView项的XML中:
android:background="?android:attr/activatedBackgroundIndicator"
小智 12
只需在路上创建一个名为custom_background的drawable:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@color/highlight" android:state_activated="true"/>
<item android:drawable="@color/normal"/>
</selector>
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并在父布局上设置为背景:
android:background="@drawable/custom_background"
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