使用ExpandableListView实现一个时光轴
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在许多App上都能看到时光轴的效果,比如携程等等,那么我们今天就利用ExpandableListView来实现一个时光轴效果,先来看看效果图:
效果还是挺简单的,这里我们主要是采用ExpandableListView来实现,关于ExpandableListView的详细使用参见(android开发之ExpandableListView的使用,实现类似QQ好友列表),我们这里主要介绍这个效果的实现:
先来看看主布局文件:
- <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
- xmlns:tools="http://schemas.android.com/tools"
- android:layout_width="match_parent"
- android:layout_height="match_parent" >
-
- <TextView
- android:id="@+id/title_p"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_centerHorizontal="true"
- android:layout_margin="12dp"
- android:gravity="center"
- android:text="2015年11月"
- android:textSize="18sp" />
-
- <View
- android:id="@+id/hor_div"
- android:layout_width="match_parent"
- android:layout_height="1dp"
- android:layout_below="@id/title_p"
- android:background="#9F79EE" />
-
- <View
- android:id="@+id/ver_div"
- android:layout_width="1dp"
- android:layout_height="match_parent"
- android:layout_below="@id/hor_div"
- android:layout_marginLeft="70dp"
- android:background="#9F79EE" />
-
- <TextView
- android:id="@+id/title_c"
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:layout_below="@id/hor_div"
- android:layout_marginLeft="60dp"
- android:paddingBottom="12dp"
- android:paddingLeft="18dp"
- android:paddingTop="12dp"
- android:text="时光轴"
- android:textSize="24sp" />
-
- <ExpandableListView
- android:id="@+id/lv"
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- android:layout_below="@id/title_c"
- android:layout_marginLeft="60dp"
- android:background="@null"
- android:clickable="false"
- android:divider="@null" >
- </ExpandableListView>
-
- </RelativeLayout>
两条分割线用View来做,整体不难,不多说,看看MainActivity
- public class MainActivity extends Activity {
-
- private List<TimeLineBean> list;
- private ExpandableListView lv;
-
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- requestWindowFeature(Window.FEATURE_NO_TITLE);
- setContentView(R.layout.activity_main);
- initData();
- initView();
- }
-
- private void initView() {
- lv = (ExpandableListView) this.findViewById(R.id.lv);
- lv.setAdapter(new MyAdapter(MainActivity.this, list));
- for (int i = 0; i < list.size(); i++) {
- lv.expandGroup(i);
- }
- lv.setGroupIndicator(null);
- lv.setOnGroupClickListener(new OnGroupClickListener() {
-
- @Override
- public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
- return true;
- }
- });
- }
-
- private void initData() {
- list = new ArrayList<TimeLineBean>();
- List<String> things = new ArrayList<String>();
- things.add("六王毕,四海一;");
- things.add("蜀山兀,阿房出。");
- things.add("覆压三百余里,隔离天日。");
- list.add(new TimeLineBean("11月24日", things));
- things = new ArrayList<String>();
- things.add("骊山北构而西折,");
- things.add("直走咸阳。");
- things.add("二川溶溶,流入宫墙。");
- list.add(new TimeLineBean("11月23日", things));
- things = new ArrayList<String>();
- things.add("五步一楼,十步一阁;");
- things.add("廊腰缦回,");
- list.add(new TimeLineBean("11月22日", things));
- things = new ArrayList<String>();
- things.add("檐牙高啄;");
- things.add("各抱地势,钩心斗角。");
- things.add("盘盘焉,囷囷焉,蜂房水涡,");
- things.add("矗不知乎几千万落!");
- list.add(new TimeLineBean("11月21日", things));
- things = new ArrayList<String>();
- things.add("长桥卧波,未云何龙?");
- things.add("複道行空,不霁何虹?");
- things.add("高低冥迷,不知西东。");
- list.add(new TimeLineBean("11月20日", things));
- things = new ArrayList<String>();
- things.add("歌台暖响,");
- things.add("春光融融;");
- list.add(new TimeLineBean("11月19日", things));
- things = new ArrayList<String>();
- things.add("舞殿冷袖,");
- things.add("风雨凄凄。");
- things.add("一日之内,一宫之间,");
- things.add("而气候不齐。");
- list.add(new TimeLineBean("11月18日", things));
- }
- }
在MainActivity中我们先初始化模拟数据,然后初始化View,初始化View的过程中,通过一个for循环让所有的group展开,然后再屏蔽掉group的点击事件,好了,再来看看Adapter:
- public class MyAdapter extends BaseExpandableListAdapter {
-
- private Context context;
- private List<TimeLineBean> list;
-
- public MyAdapter(Context context, List<TimeLineBean> list) {
- this.context = context;
- this.list = list;
- }
-
- @Override
- public Object getChild(int groupPosition, int childPosition) {
- return list.get(groupPosition).getThings();
- }
-
- @Override
- public long getChildId(int groupPosition, int childPosition) {
- return childPosition;
- }
-
- @Override
- public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView,
- ViewGroup parent) {
- ChildHolder holder = null;
- if (convertView == null) {
- convertView = LayoutInflater.from(context).inflate(R.layout.child_item, null);
- holder = new ChildHolder();
- holder.tv = (TextView) convertView.findViewById(R.id.ci_thing);
- convertView.setTag(holder);
- } else {
- holder = (ChildHolder) convertView.getTag();
- }
- holder.tv.setText(list.get(groupPosition).getThings().get(childPosition));
- return convertView;
- }
-
- @Override
- public int getChildrenCount(int groupPosition) {
- return list.get(groupPosition).getThings().size();
- }
-
- @Override
- public Object getGroup(int groupPosition) {
- return list.get(groupPosition).getDate();
- }
-
- @Override
- public int getGroupCount() {
- return list.size();
- }
-
- @Override
- public long getGroupId(int groupPosition) {
- return groupPosition;
- }
-
- @Override
- public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
- GroupHolder holder = null;
- if (convertView == null) {
- convertView = LayoutInflater.from(context).inflate(R.layout.group_item, null);
- holder = new GroupHolder();
- holder.tv = (TextView) convertView.findViewById(R.id.gi_date);
- convertView.setTag(holder);
- } else {
- holder = (GroupHolder) convertView.getTag();
- }
- holder.tv.setText(list.get(groupPosition).getDate());
- return convertView;
- }
-
- @Override
- public boolean hasStableIds() {
- return false;
- }
-
- @Override
- public boolean isChildSelectable(int groupPosition, int childPosition) {
- return false;
- }
-
- class GroupHolder {
- TextView tv;
- }
-
- class ChildHolder {
- TextView tv;
- }
-
- }
这个Adapter也没啥讲的,大家如果有疑问可以参见android开发之ExpandableListView的使用,实现类似QQ好友列表
,这里有ExpandableListView的详细介绍。最后就是两个item文件:group_item.xml
- <?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="match_parent"
- android:orientation="horizontal" >
-
- <View
- android:layout_width="20dp"
- android:layout_height="20dp"
- android:layout_marginTop="22dp"
- android:background="@drawable/circle" />
-
- <TextView
- android:id="@+id/gi_date"
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:paddingBottom="16dp"
- android:paddingLeft="12dp"
- android:paddingTop="18dp"
- android:text="11月24号"
- android:textSize="22sp" />
-
- </LinearLayout>
child_item.xml:
- <?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="match_parent"
- android:orientation="vertical" >
-
- <TextView
- android:id="@+id/ci_thing"
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:paddingLeft="22dp"
- android:paddingTop="8dp"
- android:text="11月24号"
- android:textColor="#999999"
- android:textSize="16sp" />
-
- </LinearLayout>
每个group_item的前面有一个红色的实心球,这个球我们用shape来绘制,关于shape的使用参见android开发之shape详解
:circle.xml
- <?xml version="1.0" encoding="utf-8"?>
- <shape xmlns:android="http://schemas.android.com/apk/res/android"
- android:shape="oval" >
-
- <corners android:radius="10dp" />
-
- <size
- android:height="10dp"
- android:width="10dp" />
-
- <solid android:color="#FF6A6A" />
-
- </shape>
好了,这个东西貌似没难度,其实就是ExpandableListView的使用。Demo下载http://download.csdn.net/detail/u012702547/9297507
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