ListView自身带了单选、多选模式,可通过listview.setChoiceMode来设置:
listview.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);//开启多选模式
listview.setChoiceMode(ListView.CHOICE_MODE_SINGLE);//开启单选模式
listview.setChoiceMode(ListView.CHOICE_MODE_NONE);//默认模式
listview.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL);//没用过,不知道用来干嘛的
实现单选
需要设置:listview.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
ListView控件还需要指定一个selector: android:listSelector="@drawable/checkable_item_selector"
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@color/c1" android:state_pressed="true"/>
<item android:drawable="@color/c1" android:state_checked="true"/>
<item android:drawable="@color/c2"/>
</selector>
但是单选选中时的颜色还是系统选中的颜色,而不是自己设定的c1,不知道为什么?
实现多选
设置:listview.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
需要对每个item的view实现Checkable接口,以下是LinearLayout实现Checkable接口:
public class CheckableLinearLayout extends LinearLayout implements Checkable {
private boolean mChecked;
public CheckableLinearLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public void setChecked(boolean checked) {
mChecked = checked;
setBackgroundDrawable(checked ? new ColorDrawable(0xff0000a0) : null);//当选中时呈现蓝色
}
@Override
public boolean isChecked() {
return mChecked;
}
@Override
public void toggle() {
setChecked(!mChecked);
}
}
如下使用:
<com.ljfbest.temp.CheckableLinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/tv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:minHeight="?android:attr/listPreferredItemHeightSmall"
android:paddingEnd="?android:attr/listPreferredItemPaddingEnd"
android:paddingStart="?android:attr/listPreferredItemPaddingStart"
android:textAppearance="?android:attr/textAppearanceListItemSmall" />
</com.ljfbest.temp.CheckableLinearLayout>
以下附上demo图:
以下是几个获取/设置 选中条目信息的API:
listview.getCheckedItemCount();//获取选中行数:对CHOICE_MODE_NONE无效
listview.getCheckedItemPosition();//获取选中的某行,只针对单选模式有效,返回int
listview.getCheckedItemIds();//获取选中条目的ids,是long[]类型,注意需要adapter的hasStableIds()返回true,并且这些id是adapter的getItemId(int position)返回的.demo中有演示
listview.setItemChecked(position, value);//设置某行的状态
另外,使用ListView时可能会报以下错误:
java.lang.ClassCastException: android.widget.HeaderViewListAdapter cannot be cast to android.widget.SimpleAdapter
ListView有headerView/footerView时,它的原来的Adapter会被封装一下成为HeaderViewListAdapter:
ListAdapter used when a ListView has header views. This ListAdapter wraps another one and also keeps track of the header views and their associated data objects.
This is intended as a base class; you will probably not need to use this class directly in your own code.
可通过以下方式获取原来的Adapter:
HeaderViewListAdapter hAdapter = (HeaderViewListAdapter) listview.getAdapter();
MyAdapter my = ( MyAdapter) hAdapter.getWrappedAdapter();
所以,当增加一条header/footer时lv_data.getAdapter()).getWrappedAdapter().getCount()与((HeaderViewListAdapter)listview.getAdapter()).getWrappedAdapter().getCount()是相差1的
Demo地址:
http://download.csdn.net/detail/ljfbest/8109731