


下面讲解以下在使用listview时最常见的几个问题。
1.如何改变item的背景色和按下颜色
listview默认情况下,item的背景色是黑色,在用户点击时是黄色的。如果需要修改为自定义的背景颜色,一般情况下有三种方法:
1)设置listSelector
2)在布局文件中设置item的background
3)在adapter的getview中设置
这三种方法都能达到改变item默认的背景色和按下颜色,下面来分别讲解,但是在这之前需要先写好selector.xml文件;
<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_pressed="true" android:drawable="@color/light_blue"></item> <item android:state_pressed="false" android:drawable="@color/sgray"></item> </selector>
在改变button或者listview的item默认背景色,就可以用到selector。drawable可以设置为色彩资源,也可以设置为图片资源。
1)设置listview的listSelector
<ListView android:id="@+id/history_list" android:layout_width="fill_parent" android:layout_height="wrap_content" android:divider="#565C5D" android:dividerHeight="3dp" android:listSelector="@drawable/selector" android:cacheColorHint="@android:color/transparent"> </ListView>
2)在listitem的布局文件中设置background属性,下面是listitem的布局文件
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@drawable/selector"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="历史记录" android:textColor="#ffffff" android:textSize="20sp" android:layout_centerInParent="true"> </TextView> </RelativeLayout>
3)在adapter的getView方法中设置
if(convertView ==null) { convertView = LayoutInflater.from(context).inflate(R.layout.listitem, null); } convertView.setBackgroundResource(R.drawable.selector);
上述方法都能达到同样的效果,就是改变item默认的背景色和点击时的背景颜色,第三种方法最灵活,如果listview的奇数行和偶数行需要设置为不同的selector,只能用第三种方法。
2.包含button,checkbox等控件时点击无响应问题。
如果listitem里面包括button或者checkbox等控件,默认情况下listitem会失去焦点,导致无法响应item的事件,最常用的解决办法是在listitem的布局文件中设置descendantFocusability属性。
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content" android:paddingTop="10dp" android:paddingBottom="10dp" android:paddingLeft="5dp" android:paddingRight="5dp" android:descendantFocusability="blocksDescendants"> <CheckBox android:id="@+id/history_item_checkbt" android:layout_height="30dp" android:layout_width="wrap_content" android:layout_centerVertical="true" android:layout_alignParentLeft="true" android:checked="false" > </CheckBox> <ImageView android:id="@+id/history_item_image" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerVertical="true" android:layout_toRightOf="@id/history_item_checkbt" android:background="@drawable/item_icon"> </ImageView> <Button android:id="@+id/history_item_edit_bt" android:layout_alignParentRight="true" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerVertical="true" android:text="编辑" android:textColor="#ffffff" android:textSize="14sp" android:background="@drawable/button_bg"> </Button> <TextView android:id="@+id/history_item_time_tv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerVertical="true" android:textColor="#565C5D" android:textSize="14sp" android:text="10-01 10:20" android:layout_marginRight="5dp" android:layout_toLeftOf="@id/history_item_edit_bt"> </TextView> <TextView android:id="@+id/history_item_title_tv" android:layout_height="wrap_content" android:layout_width="fill_parent" android:layout_centerVertical="true" android:textColor="#565C5D" android:textSize="14sp" android:text="xxxxxxxxXXXXXXXXXXXXXXXX" android:ellipsize="end" android:maxLines="1" android:layout_toRightOf="@id/history_item_image" android:layout_toLeftOf="@id/history_item_time_tv" android:layout_marginLeft="3dp"> </TextView> </RelativeLayout>
更多Android ListView的item背景色设置和item点击无响应的解决方法相关文章请关注PHP中文网!

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