Android ListView圆角
16lz
2021-01-23
首先来看看ListView 相关基本属性
1、单击列表后，列表的背景变成黑色了。可通过指定android:cacheColorHint的属性来放变它，将它指定为透明。使用下面的属性值：
android:cacheColorHint="#000000" 即可。
2、去除列表项中间的分割线：android:divider="#00000000"，这里的值也可以指向一个drawable图片对象(android:divider="@drawable/list_line")，如果使用了图片高度大于系统的像素的话，可以自己设定一个高度。android:dividerHight="10px"
3、listview在拖动时，listview的背景变成黑色。用这个可解决：android:scrollingCache="false"
4、listview的上边和下边有黑色的阴影。用这个可解决：android:fadingEdge="none"
5、listview右边的滑动条覆盖列表项的内容。用这个可解决：android:scrollbarStyle="outsideInset"
6、修改listvew右边的滑动条与列表项之间的距离。用这个可解决：android:paddingRight="10dip"，可以根据需要进行修改。
7、修改右边的滑动条显示的颜色。用这个可解决：
android:scrollbarTrackVertical="@drawable/scrollbar_vertical_track"
android:scrollbarThumbVertical="@drawable/scrollbar_vertical_thumb"
其中scrollbar_vertical_track和scrollbar_vertical_thumb是滑动条的XML配置文件，在API中有，可根据自己的需要修改一下开始颜色和结束颜色即可。
具体请参考这篇文章 Android ListView 属性
下面来看看ListView 圆角实现，本文主要亮点是数据源可以灵活设置，不用在xml上写死了。
1.在drawable文件下新建
list_bottom_selector.xml
<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_pressed="true"><shape> <solid android:color="#ADFF2F" /> <corners android:bottomLeftRadius="4dp" android:bottomRightRadius="4dp" /> </shape></item> <item><shape> <solid android:color="@color/white" /> <corners android:bottomLeftRadius="4dp" android:bottomRightRadius="4dp" /> </shape></item></selector>如法炮制 新建几个xml
list_rect_selector.xml
<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_pressed="true"><shape> <solid android:color="#ADFF2F" /> </shape></item> <item><shape> <solid android:color="@color/white" /> </shape></item></selector>
list_round_selector.xml
<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_pressed="true"><shape> <solid android:color="#ADFF2F" /> <corners android:bottomLeftRadius="4dp" android:bottomRightRadius="4dp" android:topLeftRadius="4dp" android:topRightRadius="4dp"/> </shape></item> <item><shape> <solid android:color="@color/white" /> <corners android:bottomLeftRadius="4dp" android:bottomRightRadius="4dp" android:topLeftRadius="4dp" android:topRightRadius="4dp"/> </shape></item> </selector>
list_top_selector.xml
<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_pressed="true"><shape> <solid android:color="#ADFF2F" /> <corners android:topLeftRadius="4dp" android:topRightRadius="4dp" /> </shape></item> <item><shape> <solid android:color="@color/white" /> <corners android:topLeftRadius="4dp" android:topRightRadius="4dp" /> </shape></item> </selector>
接下来我们在layout新建一个item.xml
<?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="wrap_content" android:paddingRight="5dp" > <TextView android:id="@+id/text" android:layout_width="fill_parent" android:layout_height="40dp" android:textSize="16sp" android:paddingLeft="15dp" android:textColor="#000000" android:gravity="left|center_vertical" /> <ImageView android:src="@drawable/common_left" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerVertical="true" android:layout_alignParentRight="true" /></RelativeLayout>
后新建一个activity_main.xml 来作为我们程序的主页面，也就是我们要显示ListView，布局也很简单
如下：
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:paddingLeft="10dp" android:paddingRight="10dp" android:paddingTop="15dp" > <ListView android:id="@+id/list1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:background="@drawable/round_bg" android:cacheColorHint="#00000000" android:divider="@color/list_divider" android:dividerHeight="0.1dp" android:listSelector="#00000000" > </ListView> <ListView android:id="@+id/list2" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginTop="15dp" android:background="@drawable/round_bg" android:cacheColorHint="#00000000" android:divider="@color/list_divider" android:dividerHeight="0.1dp" android:listSelector="#00000000" > </ListView> <ListView android:id="@+id/list3" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginTop="15dp" android:background="@drawable/round_bg" android:cacheColorHint="#00000000" android:divider="@color/list_divider" android:dividerHeight="1px" android:listSelector="@color/transparent" > </ListView> </LinearLayout>
然后新建一个MainActivity
public class MainActivity extends Activity {private ListView list1;private ListView list2;private ListView list3;String array1[] = {"设置"};String array2[] = {"朋友圈","我的空间"};String array3[] = {"我的钱包","我的收藏","我的相册","关联"};@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();} private void initView() {list1 = (ListView) findViewById(R.id.list1);list2 = (ListView) findViewById(R.id.list2);list3 = (ListView) findViewById(R.id.list3);list1.setAdapter(new MyListAdapter(array1,this));list2.setAdapter(new MyListAdapter(array2,this));list3.setAdapter(new MyListAdapter(array3,this)); }} 后面我们自定义一个MyListAdapter 继承BaseAdapter
public class MyListAdapter extends BaseAdapter {private LayoutInflater inflater;private String[] array;private Context mContext;public MyListAdapter(String[] array,Context context) {inflater = LayoutInflater.from(context);this.array = array;this.mContext =context; }@Overridepublic int getCount() {// TODO Auto-generated method stubreturn array.length;}@Overridepublic Object getItem(int position) {// TODO Auto-generated method stubreturn array[position];}@Overridepublic long getItemId(int position) {// TODO Auto-generated method stubreturn position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {// TODO Auto-generated method stubconvertView = inflater.inflate(R.layout.item, null);TextView tv = (TextView) convertView.findViewById(R.id.text);tv.setText(array[position]);if (array.length == 1) {setBackgroundDrawable(convertView,R.drawable.list_round_selector);} else if (array.length == 2) {if (position == 0) {setBackgroundDrawable(convertView,R.drawable.list_top_selector);} else if (position == array.length - 1) {setBackgroundDrawable(convertView,R.drawable.list_bottom_selector);}} else {if (position == 0) {setBackgroundDrawable(convertView,R.drawable.list_top_selector);} else if (position == array.length - 1) {setBackgroundDrawable(convertView,R.drawable.list_bottom_selector);} else {setBackgroundDrawable(convertView,R.drawable.list_rect_selector);}}return convertView;}private void setBackgroundDrawable(View view, int resID) {view.setBackgroundDrawable(mContext.getResources().getDrawable(resID));}} 效果图：