android中怎么自定义树形
android中怎么自定义树形,针对这个问题,这篇文章详细介绍了相对应的分析和解答,希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。
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TreeView.java代码:
package com.tbx.android.widget; import java.util.ArrayList; public class TreeView extends ListView implements OnItemClickListener { private static String TAG = "TreeView"; ListtreeElements = null;// 所有节点集合 List currentElements = null;// 当前显示的节点集合 List tempElements = null;// 用于临时存储 HashMap > deleteMap = new HashMap >(); //用于存储要删除的子节点,以及间接子节点。 TreeViewAdapter adapter = null;// 用于数据填充 LastLevelItemClickListener itemClickCallBack;// 用户点击事件回调 public TreeView(final Context context, AttributeSet attrs) { super(context, attrs); Log.d(TAG, "create with TreeView(Context context, AttributeSet attrs)"); treeElements = new ArrayList (); currentElements = new ArrayList (); adapter = new TreeViewAdapter(context, currentElements); this.setAdapter(adapter); itemClickCallBack = new LastLevelItemClickListener() { @Override public void onLastLevelItemClick(int position,TreeViewAdapter adapter) { Log.d(TAG, "last level element " + currentElements.get(position).getTitle() + " is clicked"); } }; this.setOnItemClickListener(this); } public void initData(Context context, List treeElements) { this.treeElements = treeElements; getFirstLevelElements(context); adapter.notifyDataSetChanged(); } /** * 设置点击事件回调接口 * * @param itemClickCallBack */ public void setLastLevelItemClickCallBack(LastLevelItemClickListener itemClickCallBack) { this.itemClickCallBack = itemClickCallBack; } /** * 初始化树形结构列表数据,把第一层级的数据添加到currentElements中 */ public void getFirstLevelElements(Context context) { Log.d(TAG, "initCurrentElements"); int size = treeElements.size(); Log.d(TAG, "tree elements num is: " + size); if (currentElements == null) { currentElements = new ArrayList (); } currentElements.clear(); for (int i = 0; i < size; i++) { if (treeElements.get(i).getLevel() == 1) { currentElements.add(treeElements.get(i)); Log.d(TAG, "find a first level element: " + treeElements.get(i)); } } } /** * 从所有节点集合中获取某父节点的子节点集合 * * @param parentId * @return */ private List getChildElementsFromAllById(String parentId) { tempElements = new ArrayList (); int size = treeElements.size(); for (int i = 0; i < size; i++) { String temptParentId = treeElements.get(i).getParentId() ; if(temptParentId != null){ if (temptParentId.equalsIgnoreCase(parentId)) { tempElements.add(treeElements.get(i)); Log.d(TAG, "find a child element: " + treeElements.get(i)); } } } return tempElements; } /** * 从当前显示的节点集合中 , 获取某父节点的子节点集合 * @param parentId * @return */ private List getChildElementsFromCurrentById(String parentId) { Log.d(TAG, "getChildElementsFromCurrentById parentId: " + parentId); if (tempElements == null) { tempElements = new ArrayList (); } else { tempElements.clear(); } int size = currentElements.size(); if(size > 0){ for(TreeElement treeElement : currentElements){ String temp = treeElement.getParentId(); if(temp != null){ if (temp.equalsIgnoreCase(parentId)) { tempElements.add(treeElement); Log.d(TAG, "find a child element to delete: " +treeElement); } } } } return tempElements; } /** * 删除某父节点的所有子节点集合(包括直接节点和间接节点) * @param parentId * @return */ private synchronized boolean delAllChildElementsByParentId(String parentId) { Log.e(TAG, "delAllChildElementsByParentId: " + parentId); List childElments = getChildElementsFromCurrentById(parentId); List treeElementsToDel = deleteMap.get(parentId); if (treeElementsToDel == null) { treeElementsToDel = new ArrayList (); deleteMap.put(parentId, treeElementsToDel); } else { treeElementsToDel.clear(); } int size = childElments.size(); Log.e(TAG, "childElments size : " + size); TreeElement childElement = null; for (int i = 0; i < size; i++) { childElement = childElments.get(i); //寻找间接节点 if (childElement.hasChild && childElement.fold) { treeElementsToDel.add(childElement); } } size = treeElementsToDel.size(); Log.e(TAG, "treeElementsToDel size : " + size); if(size > 0){ //删除间接节点 List deleteTreeElement = treeElementsToDel; for(TreeElement element : deleteTreeElement){ delAllChildElementsByParentId(element.getId()); } } //删除直接节点 delDirectChildElementsByParentId(parentId); return true; } /** * 删除某父节点的直接子节点集合 * * @param parentId * @return */ private synchronized boolean delDirectChildElementsByParentId( String parentId) { Log.d(TAG, "delDirectChildElementsByParentId(): " + parentId); boolean success = false; if (currentElements == null || currentElements.size() == 0) { Log.d(TAG, "delChildElementsById() failed,currentElements is null or it's size is 0"); return success; } synchronized (currentElements) { int size = currentElements.size(); Log.d(TAG, "begin delete"); for (int i = size - 1; i >= 0; i--) { String temp = currentElements.get(i).getParentId(); if(temp != null && temp.equalsIgnoreCase(parentId)){ currentElements.get(i).fold = false;// 记得隐藏子节点时把展开状态设为false currentElements.remove(i); } } } success = true; return success; } /** * 根据id查下标 * * @param id * @return */ @SuppressWarnings("unused") private int getElementIndexById(String id) { int num = currentElements.size(); for (int i = 0; i < num; i++) { if (currentElements.get(i).getId().equalsIgnoreCase(id)) { return i; } } return -1; } @SuppressWarnings("unused") private TreeElement getElementById(String id){ int num = currentElements.size(); if( num > 0){ for (int i = 0; i < num; i++) { if (currentElements.get(i).getId().equalsIgnoreCase(id)) { return currentElements.get(i); } } } return null; } @Override public void onItemClick(AdapterView> arg0, View convertView, int position, long id) { TreeElement element = currentElements.get(position); if (element.isHasChild()) {// 当前节点有子节点时只进行数据显示或隐藏等操作 if (!element.isFold()) {// 当前父节点为未展开状态 currentElements.addAll(position + 1,this.getChildElementsFromAllById(element.getId())); } else if (element.fold) {// 当前父节点为展开状态 boolean success = this.delAllChildElementsByParentId(element.getId()); Log.d(TAG, "delete child state: " + success); if (!success) { return; } } element.setFold(!element.isFold());// 设置反状态 adapter.notifyDataSetChanged();// 刷新数据显示 } else {// 当前节点有子节点时只进行用户自定义操作 itemClickCallBack.onLastLevelItemClick(position,adapter); } } /** * 自定义内部接口,用于用户点击最终节点时的事件回调 */ public interface LastLevelItemClickListener { public void onLastLevelItemClick(int position,TreeViewAdapter adapter); } }
TreeElement.java代码:
/** * 类名:TreeElement.java * 类描述:树形结构节点类 * 创建时间:2012-11-23 16:32 */ public class TreeElement { String id = null;// 当前节点id String title = null;// 当前节点文字 boolean hasParent = false;// 当前节点是否有父节点 boolean hasChild = false;// 当前节点是否有子节点 boolean childShow = false;// 如果子节点,字节当当前是否已显示 String parentId = null;// 父节点id int level = -1;// 当前界面层级 boolean fold = false;// 是否处于展开状态 ... }
TreeViewAdapter.java
package com.tbx.android.adapter; import java.util.List; /** * 类名:TreeViewAdapter.java * 类描述:用于填充数据的类 * 创建时间:2012-11-23 16:32 */ public class TreeViewAdapter extends BaseAdapter { class ViewHolder { ImageView icon; TextView title; } Context context; ViewHolder holder; LayoutInflater inflater; Listelements; public TreeViewAdapter(Context context, List elements) { this.context = context; this.elements = elements; } @Override public int getCount() { return elements.size(); } @Override public Object getItem(int position) { return elements.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { /** * ---------------------- get holder------------------------ */ if (convertView == null) { if (inflater == null) { inflater = LayoutInflater.from(context); } holder = new ViewHolder(); convertView = inflater .inflate(R.layout.tree_view_item, null); holder.icon = (ImageView) convertView .findViewById(R.id.tree_view_item_icon); holder.title = (TextView) convertView .findViewById(R.id.tree_view_item_title); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } /** * ---------------------- set holder-------------------------- */ if (elements.get(position).isHasChild()) {// 有子节点,要显示图标 if (elements.get(position).isFold()) { holder.icon.setImageResource(R.drawable.tree_view_icon_open); } else if (!elements.get(position).isFold()) { holder.icon.setImageResource(R.drawable.tree_view_icon_close); } holder.icon.setVisibility(View.VISIBLE); } else {// 没有子节点,要隐藏图标 holder.icon.setImageResource(R.drawable.tree_view_icon_close); holder.icon.setVisibility(View.INVISIBLE); } holder.icon.setPadding(25 * (elements.get(position).getLevel()), 0, 0, 0);// 根据层级设置缩进 holder.title.setText(elements.get(position).getTitle()); holder.title.setTextSize(35 - elements.get(position).getLevel() * 5); // 根据层级设置字体大小 return convertView; } }
MainActivity.java
public class MainActivity extends Activity { private TreeView lvAddress; //通讯录列表 private ListlvAddressData = new ArrayList (); @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); lvAddress = (TreeView) findViewById(R.id.frame_listview_address); LastLevelItemClickListener itemClickCallBack = new LastLevelItemClickListener() { // 创建节点点击事件监听 @Override public void onLastLevelItemClick(int position, TreeViewAdapter adapter) { TreeElement element = (TreeElement) adapter.getItem(position); //然后自己处理 } }; //初始化数据 initData(); lvAddress.initData(this, lvAddressData);// 初始化数据 lvAddress.setLastLevelItemClickCallBack(itemClickCallBack);// 设置节点点击事件监听 } private void initData() {//测试数据 TreeElement root = new TreeElement(); root.setId("01"); root.setLevel(1); root.setTitle("好友"); root.setFold(false); root.setHasChild(true); root.setHasParent(false); root.setParentId(null); lvAddressData.add(root); TreeElement twoLevel = new TreeElement(); twoLevel.setId("0101"); twoLevel.setLevel(2); twoLevel.setTitle("初中同学"); twoLevel.setFold(false); twoLevel.setHasChild(true); twoLevel.setHasParent(true); twoLevel.setParentId("01"); lvAddressData.add(twoLevel); TreeElement threeLevel = new TreeElement(); threeLevel.setId("010101"); threeLevel.setLevel(3); threeLevel.setTitle("发财"); threeLevel.setFold(false); threeLevel.setHasChild(false); threeLevel.setHasParent(true); threeLevel.setParentId("0101"); lvAddressData.add(threeLevel); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.activity_main, menu); return true; } }
tree_view_item.xml布局内容
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