首先我们还是来看一些案例,还是拿搜狐新闻客户端,因为我天天上下班没事爱看这个东东,上班又没时间看新闻,上下班路途之余浏览下新闻打发时间嘛.
看这个效果挺棒吧,其实实现起来也不难,我简单说明下.
首先我们用到的控件是:ExpandableListView
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” >
- <!–
- android:groupIndicator=“@null” 取消默认图片
- android:childIndicatorLeft 设置孩子左边间距
- android:dividerHeight 这个高度一定要设置,不然显示不出来分割线,估计默认为0 吧
- android:childDivider=“@drawable/child_bg” 这个直接引color,或者图片会导致整个孩子背景都为这个颜色 ,不知道原因,如果有谁知道,请Give me say.
- –>
- <ExpandableListView
- android:id=“@+id/expandablelist”
- android:layout_width=“match_parent”
- android:layout_height=“match_parent”
- android:cacheColorHint=“@null”
- android:childDivider=“@drawable/child_bg”
- android:childIndicatorLeft=“0dp”
- android:divider=“@color/Grey”
- android:dividerHeight=“1dp”
- android:groupIndicator=“@null”
- android:scrollbarAlwaysDrawHorizontalTrack=“true” >
- </ExpandableListView>
- </RelativeLayout>
MyexpandableListAdapter.java
- /***
- * 数据源
- *
- * @author Administrator
- *
- */
- class MyexpandableListAdapter extends BaseExpandableListAdapter {
- private Context context;
- private LayoutInflater inflater;
- public MyexpandableListAdapter(Context context) {
- this.context = context;
- inflater = LayoutInflater.from(context);
- }
- // 返回父列表个数
- @Override
- public int getGroupCount() {
- return groupList.size();
- }
- // 返回子列表个数
- @Override
- public int getChildrenCount(int groupPosition) {
- return childList.get(groupPosition).size();
- }
- @Override
- public Object getGroup(int groupPosition) {
- return groupList.get(groupPosition);
- }
- @Override
- public Object getChild(int groupPosition, int childPosition) {
- return childList.get(groupPosition).get(childPosition);
- }
- @Override
- public long getGroupId(int groupPosition) {
- return groupPosition;
- }
- @Override
- public long getChildId(int groupPosition, int childPosition) {
- return childPosition;
- }
- @Override
- public boolean hasStableIds() {
- return true;
- }
- @Override
- public View getGroupView(int groupPosition, boolean isExpanded,
- View convertView, ViewGroup parent) {
- GroupHolder groupHolder = null;
- if (convertView == null) {
- groupHolder = new GroupHolder();
- convertView = inflater.inflate(R.layout.group, null);
- groupHolder.textView = (TextView) convertView
- .findViewById(R.id.group);
- groupHolder.imageView = (ImageView) convertView
- .findViewById(R.id.image);
- groupHolder.textView.setTextSize(15);
- convertView.setTag(groupHolder);
- } else {
- groupHolder = (GroupHolder) convertView.getTag();
- }
- groupHolder.textView.setText(getGroup(groupPosition).toString());
- if (isExpanded)// ture is Expanded or false is not isExpanded
- groupHolder.imageView.setImageResource(R.drawable.expanded);
- else
- groupHolder.imageView.setImageResource(R.drawable.collapse);
- return convertView;
- }
- @Override
- public View getChildView(int groupPosition, int childPosition,
- boolean isLastChild, View convertView, ViewGroup parent) {
- if (convertView == null) {
- convertView = inflater.inflate(R.layout.item, null);
- }
- TextView textView = (TextView) convertView.findViewById(R.id.item);
- textView.setTextSize(13);
- textView.setText(getChild(groupPosition, childPosition).toString());
- return convertView;
- }
- @Override
- public boolean isChildSelectable(int groupPosition, int childPosition) {
- return true;
- }
- }
- @Override
- public boolean onGroupClick(final ExpandableListView parent, final View v,
- int groupPosition, final long id) {
- return false;
- }
上面实现起来比较简单.相信对listview熟悉的朋友看这个一定很熟悉,无外乎就是多了个孩子.
selector_group.xml
- <?xml version=“1.0” encoding=“utf-8”?>
- <selector xmlns:android=“http://schemas.android.com/apk/res/android”>
- <item android:drawable=“@color/Grey” android:state_pressed=“true”></item>
- <item android:drawable=“@color/Grey” android:state_selected=“true”></item>
- <item android:drawable=“@color/LightGray”></item>
- </selector>
selector_item.xml 同理.
效果图:
效果虽然丑了点,不过就是这么回事,至于显示group的item,还是孩子的item,你可以随意定制.
不想敲的同学,可以下载源码,稍作调整.
/********************************LIstView模拟ExpandableListView**************************************************************/
下面我们接着看一些案例:
其实就是:点击listview的一个item,展开其孩子,点击另一个item,打开其孩子,关闭之前那个孩子.
这个眨一看是ExpandableListView这个东东,可是本人比较笨戳,整了好久没有弄出来,最终放弃,google下,发现有人用listview来模拟实现,也就跟着做了下.
布局文件:(后面多个隐藏text.)
- <?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:background=“@color/white”
- android:gravity=“center_vertical”
- android:orientation=“vertical” >
- <RelativeLayout
- android:layout_width=“match_parent”
- android:layout_height=“wrap_content”
- android:background=“@drawable/selector_group”
- android:gravity=“center_vertical”
- android:orientation=“horizontal”
- android:padding=“5dp” >
- <TextView
- android:id=“@+id/group”
- android:layout_width=“wrap_content”
- android:layout_height=“wrap_content”
- android:layout_centerVertical=“true”
- android:textColor=“@color/black” />
- <ImageView
- android:id=“@+id/image”
- android:layout_width=“wrap_content”
- android:layout_height=“wrap_content”
- android:layout_alignParentRight=“true”
- android:layout_centerVertical=“true”
- android:src=“@drawable/collapse” />
- </RelativeLayout>
- <TextView
- android:id=“@+id/hint_item”
- android:layout_width=“fill_parent”
- android:layout_height=“wrap_content”
- android:gravity=“center_vertical”
- android:padding=“10dp”
- android:textColor=“@color/black”
- android:visibility=“gone” />
- </LinearLayout>
MyAdpter.java
- /***
- * 数据源
- *
- * @author zhangjia
- *
- */
- class MyAdpter extends BaseAdapter {
- private Context context;
- private LayoutInflater inflater;
- private int change_index = –1;// 改变项
- public MyAdpter(Context context) {
- super();
- this.context = context;
- inflater = (LayoutInflater) context
- .getSystemService(context.LAYOUT_INFLATER_SERVICE);
- }
- @Override
- public int getCount() {
- return groupList.size();
- }
- @Override
- public Object getItem(int position) {
- return groupList.get(position);
- }
- @Override
- public long getItemId(int position) {
- return position;
- }
- @Override
- public View getView(int position, View convertView, ViewGroup parent) {
- GroupHolder groupHolder = null;
- if (convertView == null) {
- groupHolder = new GroupHolder();
- convertView = inflater.inflate(R.layout.group, null);
- groupHolder.textView = (TextView) convertView
- .findViewById(R.id.group);
- groupHolder.imageView = (ImageView) convertView
- .findViewById(R.id.image);
- groupHolder.hint_item = (TextView) convertView
- .findViewById(R.id.hint_item);
- convertView.setTag(groupHolder);
- } else {
- groupHolder = (GroupHolder) convertView.getTag();
- }
- groupHolder.textView.setText(groupList.get(position));
- groupHolder.hint_item.setText(childList.get(position));
- if (change_index == position)
- groupHolder.hint_item.setVisibility(View.VISIBLE);
- else
- groupHolder.hint_item.setVisibility(View.GONE);
- return convertView;
- }
- /***
- * 这个方法用于更改子item的状态
- */
- public void changeImageVisable(View view, int position) {
- // 隐藏提示
- if (change_index == position) {
- GroupHolder groupHolder = (GroupHolder) view.getTag();
- if (groupHolder.hint_item.getVisibility() == View.VISIBLE)
- groupHolder.hint_item.setVisibility(View.GONE);
- else
- groupHolder.hint_item.setVisibility(View.VISIBLE);
- } else {
- change_index = position;
- notifyDataSetChanged();// restart getview
- }
- }
- }
这个数据源很简单,只是多了个用于控制孩子隐藏与显示的方法changeImageVisable.代码很简单,相信不用过多解释.
效果:
上面模拟显示的孩子是一个textview(缺点:隐藏textview显示时候点击会影响到其父控件,大家尝试一下,不过肯定有解决办法的.),
下面我来介绍下,如果孩子是listview应该怎么办.
首先配置文件:
- <?xml version=“1.0” encoding=“utf-8”?>
- <!– android:descendantFocusability=“blocksDescendants”这个属性就可以让父listview获取焦点 –>
- <LinearLayout xmlns:android=“http://schemas.android.com/apk/res/android”
- android:layout_width=“match_parent”
- android:layout_height=“wrap_content”
- android:background=“@color/white”
- android:descendantFocusability=“blocksDescendants”
- android:gravity=“center_vertical”
- android:orientation=“vertical” >
- <RelativeLayout
- android:layout_width=“match_parent”
- android:layout_height=“wrap_content”
- android:background=“@drawable/selector_group”
- android:gravity=“center_vertical”
- android:orientation=“horizontal”
- android:padding=“5dp” >
- <TextView
- android:id=“@+id/group”
- android:layout_width=“wrap_content”
- android:layout_height=“wrap_content”
- android:layout_centerVertical=“true”
- android:text=“精品推荐”
- android:textColor=“@color/black” />
- <ImageView
- android:id=“@+id/image”
- android:layout_width=“wrap_content”
- android:layout_height=“wrap_content”
- android:layout_alignParentRight=“true”
- android:layout_centerVertical=“true”
- android:src=“@drawable/collapse” />
- </RelativeLayout>
- <ListView
- android:id=“@+id/hint_item”
- android:layout_width=“fill_parent”
- android:layout_height=“wrap_content”
- android:gravity=“center_vertical”
- android:textColor=“@color/black” />
- </LinearLayout>
- /***
- * InitData
- */
- void InitData() {
- groupList = new ArrayList<String>();
- groupList.add(“Ios”);
- groupList.add(“Android”);
- groupList.add(“Window”);
- childList = new ArrayList<ArrayList<String>>();
- for (int i = 0; i < groupList.size(); i++) {
- ArrayList<String> childTemp;
- if (i == 0) {
- childTemp = new ArrayList<String>();
- childTemp.add(“iphone 4”);
- childTemp.add(“iphone 5”);
- } else if (i == 1) {
- childTemp = new ArrayList<String>();
- childTemp.add(“Anycall”);
- childTemp.add(“HTC”);
- childTemp.add(“Motorola”);
- } else {
- childTemp = new ArrayList<String>();
- childTemp.add(“Lumia 800C “);
- }
- childList.add(childTemp);
- }
- }
- /***
- * 父数据源
- *
- * @author zhangjia
- *
- */
- class MyAdpter extends BaseAdapter {
- private Context context;
- private LayoutInflater inflater;
- private int change_index = –1;// 改变项
- public MyAdpter(Context context) {
- super();
- this.context = context;
- inflater = (LayoutInflater) context
- .getSystemService(context.LAYOUT_INFLATER_SERVICE);
- }
- @Override
- public int getCount() {
- return groupList.size();
- }
- @Override
- public Object getItem(int position) {
- return groupList.get(position);
- }
- @Override
- public long getItemId(int position) {
- return position;
- }
- @Override
- public View getView(final int position, View convertView,
- ViewGroup parent) {
- GroupHolder groupHolder = null;
- if (convertView == null) {
- groupHolder = new GroupHolder();
- convertView = inflater.inflate(R.layout.group_item, null);
- groupHolder.textView = (TextView) convertView
- .findViewById(R.id.group);
- groupHolder.imageView = (ImageView) convertView
- .findViewById(R.id.image);
- groupHolder.hint_item = (ListView) convertView
- .findViewById(R.id.hint_item);
- convertView.setTag(groupHolder);
- } else {
- groupHolder = (GroupHolder) convertView.getTag();
- }
- groupHolder.textView.setText(groupList.get(position));
- groupHolder.hint_item.setAdapter(getListView(childList
- .get(position)));
- groupHolder.hint_item
- .setOnItemClickListener(new OnItemClickListener() {
- @Override
- public void onItemClick(AdapterView<?> parent,
- View view, int position_id, long id) {
- Toast.makeText(context,
- childList.get(position).get(position_id), 1)
- .show();
- }
- });
- // 动态设置listview 的高度
- setListViewHeightBaseOnChildren(groupHolder.hint_item);
- if (change_index == position) {
- groupHolder.hint_item.setVisibility(View.VISIBLE);
- groupHolder.imageView.setImageResource(R.drawable.expanded);
- }
- else {
- groupHolder.hint_item.setVisibility(View.GONE);
- groupHolder.imageView.setImageResource(R.drawable.collapse);
- }
- return convertView;
- }
- /***
- * 这个方法用于更改子item的状态
- */
- public void changeImageVisable(View view, int position) {
- // 隐藏提示
- if (change_index == position) {
- GroupHolder groupHolder = (GroupHolder) view.getTag();
- if (groupHolder.hint_item.getVisibility() == View.VISIBLE)
- groupHolder.hint_item.setVisibility(View.GONE);
- else
- groupHolder.hint_item.setVisibility(View.VISIBLE);
- } else {
- change_index = position;
- notifyDataSetChanged();// restart getview
- }
- }
- }
上面代码和刚才的差不多,唯一需要我们注意的是“
listview嵌套listview,我们需要注意哪些问题
”.
第一:listview和listview嵌套,子listview只显示一个多一点点,不能正常显示,解决办法:对listview重新设置起高度.(相信同学们对这个方法一点也不陌生.)
- /***
- * 动态设置listview的高度
- *
- * @param listView
- */
- public void setListViewHeightBaseOnChildren(ListView listView) {
- ListAdapter listAdapter = listView.getAdapter();
- if (listAdapter == null)
- return;
- int totalHeight = 0;// 总高度
- for (int i = 0; i < listAdapter.getCount(); i++) {
- View listitem = listAdapter.getView(i, null, listView);
- listitem.measure(0, 0);
- totalHeight += listitem.getMeasuredHeight();
- }
- int totalDividerHeight = 0;
- totalDividerHeight = listView.getDividerHeight()
- * (listAdapter.getCount() – 1);
- ViewGroup.LayoutParams layoutParams = listView.getLayoutParams();
- layoutParams.height = totalHeight + totalDividerHeight;
- listView.setLayoutParams(layoutParams);
- }
第二个问题:
listview 嵌套listview的时候,子listview会屏蔽掉父listview的焦点.使得父listview无法点击
.
解决办法很简单:我们只需要在父listview的Adapter里面的配置文件最顶部的如LinearLayout加入一行: android:descendantFocusability=”blocksDescendants”就ok了.
效果图:
嗯,效果还可以吧,就介绍这么多了,如有问题或好的建议请吉留言.
原创文章,作者:奋斗,如若转载,请注明出处:https://blog.ytso.com/5686.html