1.开发原因
在项目中经常需要一个需要一个树状框架，这是非常常见的控件。不过可能是谷歌考虑到android是手机系统，界面宽度有限，
所以只提供了只有二级的ExpandableListView。虽然这个控件可以满足很多需求，但是无数级的树在某些情况下还是需要的，所以我花了一天时间
（大部分时间都在调试动画去了，不过现在动画还有点问题，具体原因不明。。如果某位大神能找到原因灰常感谢）。
注：今早起来终于修复了最后一个bug，现在的动画效果已经非常完美了，等下就把加了注释的代码贴上来。
2.原理
网上很多都是扩展listview实现的，不过listview貌似不支持复杂控件的事件？而且做动画也不方便，所有我决定扩展linearlayout，在里面增加子节点的方式实现。
3.上图
图片是gif，真实效果要更加流畅一些，但是bug也还在的，就是开始隐藏的节点无法获取高度，可以通过自己事先设置解决。
3.代码
TreeView.java:
1 package net.memornote.android.ui.view; 2 3 import java.util.ArrayList; 4 import java.util.Collection; 5 import java.util.List; 6 import java.util.Timer; 7 import java.util.TimerTask; 8 9 import android.content.Context; 10 import android.graphics.Rect; 11 import android.util.AttributeSet; 12 import android.view.View; 13 import android.view.animation.Animation; 14 import android.view.animation.Animation.AnimationListener; 15 import android.view.animation.ScaleAnimation; 16 import android.view.animation.TranslateAnimation; 17 import android.widget.LinearLayout; 18 19 public class TreeView extends LinearLayout{ 20 21 // private List<TreeItem> items; 22 private List<TreeItem> sortedItems; 23 private int animTime; 24 25 public TreeView(Context context, AttributeSet attrs) { 26 super(context, attrs); 27 setOrientation(LinearLayout.VERTICAL); 28 } 29 /** 30 * initialize data,you must make sure that each item has parent except the top ones. 31 * @param items the data to show 32 * @param index the index of the tree to insert to 33 * @param viewHeight each view‘s height 34 * @param animTime if you want expand animation, 35 * you can set the time(ms) of animation,otherwise you can set 0. 36 * 37 */ 38 public void initData(Collection<TreeItem> items,int index){ 39 40 if(items==null||items.size()==0){ 41 return ; 42 } 43 44 sortItemList(items); 45 46 int size=sortedItems.size(); 47 48 initAddIndex=index<0?-Integer.MAX_VALUE:index; 49 50 for (int i=0;i<size;i++) { 51 TreeItem item=sortedItems.get(i); 52 recuseShow(item); 53 } 54 55 } 56 57 private boolean isAnim=false; 58 /** 59 * 这个方法还有很 严重的bug，无法使用。。 60 * 设置为0则关闭动画 61 * @param animTime 62 */ 63 public void enabledAnim(int animTime) { 64 if(animTime<0){ 65 isAnim=false; 66 return ; 67 } 68 this.animTime=animTime; 69 isAnim=true; 70 } 71 72 private int initAddIndex; 73 74 private void recuseShow(TreeItem item){ 75 View view=item.getView(); 76 addView(view,initAddIndex); 77 if(item.getParent()!=null){ 78 view.setVisibility(View.GONE); 79 }else { 80 view.setVisibility(View.VISIBLE); 81 } 82 initAddIndex++; 83 List<TreeItem> childrens=item.getChildrens(); 84 if(childrens.size()>0){ 85 for (TreeItem it : childrens) { 86 recuseShow(it); 87 } 88 } 89 } 90 91 private void sortItemList(Collection<TreeItem> items) { 92 //把items按照层级关系存放，sortedItems只存放顶层的item 93 sortedItems=new ArrayList<TreeItem>(5); 94 for (TreeItem item : items) { 95 if(item.getParent()==null){ 96 sortedItems.add(item); 97 }else { 98 item.getParent().getChildrens().add(item); 99 } 100 } 101 102 } 103 104 105 private int viewIndex=0; 106 private int animHeight=0; 107 private void addChild(TreeItem item,boolean isRecurse){ 108 if(item.getChildrens().size()>0){ 109 List<TreeItem> list=item.getChildrens(); 110 for (TreeItem it : list) { 111 View view=it.getView(); 112 if(view.isShown()){ 113 continue; 114 } 115 viewIndex++; 116 view.setVisibility(View.VISIBLE); 117 if(isAnim){ 118 animHeight-=it.getViewHeight(); 119 } 120 it.nextIsExpand=true; 121 if(isRecurse){ 122 addChild(it,true); 123 } 124 } 125 } 126 } 127 private int removeCount=0; 128 private synchronized void removeChild(TreeItem item,boolean isRecurse){ 129 if(item.getChildrens().size()>0){ 130 List<TreeItem> list=item.getChildrens(); 131 for (TreeItem it : list) { 132 View view=it.getView(); 133 if(!view.isShown()){ 134 continue; 135 } 136 137 TranslateAnimation ta=new TranslateAnimation(0, 0, 0, 0); 138 ta.setFillBefore(true); 139 ta.setDuration(1000); 140 view.startAnimation(ta); 141 removeCount++; 142 view.setVisibility(View.GONE); 143 if(isAnim){ 144 animHeight+=it.getViewHeight(); 145 } 146 if(isRecurse){ 147 removeChild(it,true); 148 } 149 } 150 } 151 } 152 153 private void animAdd(){ 154 TranslateAnimation ta=new TranslateAnimation( 155 Animation.ABSOLUTE, 0, 156 Animation.ABSOLUTE, 0, 157 Animation.ABSOLUTE, animHeight, 158 Animation.ABSOLUTE, 0); 159 ta.setFillBefore(true); 160 ta.setFillAfter(false); 161 ta.setDuration(animTime); 162 163 for (int i = viewIndex+1; i < getChildCount(); i++) { 164 View view=getChildAt(i); 165 if(view.isShown()){ 166 view.startAnimation(ta); 167 } 168 } 169 animHeight=0; 170 } 171 private void animRemove(){ 172 TranslateAnimation ta=new TranslateAnimation( 173 Animation.ABSOLUTE, 0, 174 Animation.ABSOLUTE, 0, 175 Animation.ABSOLUTE, animHeight, 176 Animation.ABSOLUTE, 0); 177 ta.setFillAfter(false); 178 ta.setFillBefore(true); 179 ta.setDuration(animTime); 180 181 int startAnimIndex; 182 startAnimIndex=viewIndex+1; 183 for (int i = startAnimIndex; i < getChildCount(); i++) { 184 View view=getChildAt(i); 185 if(view.isShown()){ 186 view.startAnimation(ta); 187 } 188 } 189 animHeight=0; 190 } 191 public void expand(TreeItem item){ 192 viewIndex=indexOfChild(item.getView()); 193 addChild(item,false); 194 if(isAnim){ 195 animAdd(); 196 } 197 } 198 199 200 public void expandAllChildren(TreeItem item) { 201 viewIndex=indexOfChild(item.getView()); 202 addChild(item,true); 203 if(isAnim){ 204 animAdd(); 205 } 206 } 207 208 public void expandAll(){ 209 if(sortedItems==null){ 210 return ; 211 } 212 for (TreeItem item : sortedItems) { 213 expandAllChildren(item); 214 } 215 } 216 217 public void contractAllChildren(TreeItem item) { 218 viewIndex=indexOfChild(item.getView())+1; 219 removeChild(item,true); 220 if(isAnim){ 221 animRemove(); 222 } 223 } 224 225 public void contractAll(){ 226 if(sortedItems==null){ 227 return ; 228 } 229 for (TreeItem item : sortedItems) { 230 contractAllChildren(item); 231 } 232 } 233 234 public void bind(TreeItem item) { 235 if(item.nextIsExpand){ 236 expand(item); 237 }else { 238 contractAllChildren(item); 239 } 240 item.nextIsExpand=!item.nextIsExpand; 241 } 242 243 244 }
TreeItem.java：
package net.memornote.android.ui.view; import java.util.ArrayList; import java.util.List; import android.view.View; public class TreeItem { private View view; private TreeItem parent; private List<TreeItem> childrens=new ArrayList<TreeItem>(0); public boolean nextIsExpand=true; private int viewHeight; public TreeItem(){} /** * 初始化TreeItem * @param view * @param parent */ public TreeItem(View view, TreeItem parent) { super(); this.view = view; this.parent = parent; } /** * 初始化TreeItem * @param view * @param parent */ public TreeItem(View view, TreeItem parent,int viewHeight) { super(); this.view = view; this.parent = parent; this.viewHeight=viewHeight; } public View getView() { if(view!=null){ view.setPadding(getLevel()*20,0,0,0); } return view; } public void setView(View view) { this.view = view; } public TreeItem getParent() { return parent; } public void setParent(TreeItem parent) { this.parent = parent; } /** * 动态获取该节点的级数 * @return */ public int getLevel() { int level=0; TreeItem localParent=parent; while (localParent!=null) { level++; localParent=localParent.getParent(); } return level; } public List<TreeItem> getChildrens() { return childrens; } public int getViewHeight() { if(view==null||view.getHeight()==0){ return viewHeight; } return view.getHeight(); } public void setViewHeight(int viewHeight) { this.viewHeight = viewHeight; } }
测试代码:
1 import java.util.ArrayList; 2 import java.util.List; 3 4 import net.yunstudio.util.view.treeview.TreeItem; 5 import net.yunstudio.util.view.treeview.TreeView; 6 import android.os.Bundle; 7 import android.app.Activity; 8 import android.view.Menu; 9 import android.view.View; 10 import android.view.View.OnClickListener; 11 import android.widget.Button; 12 13 public class MainActivity extends Activity { 14 15 private TreeView treeView; 16 @Override 17 protected void onCreate(Bundle savedInstanceState) { 18 super.onCreate(savedInstanceState); 19 setContentView(R.layout.activity_main); 20 treeView=(TreeView) findViewById(R.id.treeview); 21 List<TreeItem> items=new ArrayList<TreeItem>(); 22 23 initData(items); 24 treeView.initData(items, 0); 25 treeView.enabledAnim(500); 26 27 } 28 //初始化一些测试数据 29 public void initData(List<TreeItem> items) { 30 for (int i=0;i<10;i++) { 31 // TextView tv=new TextView(getActivity()); 32 Button button=new Button(this); 33 button.setText("item"+i); 34 final TreeItem item=new TreeItem(button, null); 35 36 button.setOnClickListener(new OnClickListener() { 37 @Override 38 public void onClick(View v) { 39 treeView.bind(item); 40 } 41 }); 42 43 items.add(item); 44 45 if(i%2==0){ 46 Button bt1=new Button(this); 47 bt1.setText("item"+i); 48 bt1.setClickable(true); 49 final TreeItem item_1=new TreeItem(bt1, item); 50 51 bt1.setOnClickListener(new OnClickListener() { 52 @Override 53 public void onClick(View v) { 54 55 treeView.bind(item_1); 56 } 57 }); 58 items.add(item_1); 59 60 if(i%4==0){ 61 Button bt_2=new Button(this); 62 bt_2.setText("item"+i); 63 bt_2.setClickable(true); 64 final TreeItem item_2=new TreeItem( bt_2, item_1); 65 66 bt_2.setOnClickListener(new OnClickListener() { 67 @Override 68 public void onClick(View v) { 69 treeView.bind(item_2); 70 } 71 }); 72 items.add(item_2); 73 } 74 75 } 76 77 78 } 79 } 80 81 @Override 82 public boolean onCreateOptionsMenu(Menu menu) { 83 // Inflate the menu; this adds items to the action bar if it is present. 84 getMenuInflater().inflate(R.menu.main, menu); 85 return true; 86 } 87 88 }