Android 多级菜单的实现

大致效果如下:

main.xml:

Java代码

1. <?xml version= "1.0" encoding="utf-8"?>
2. <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
3. android:orientation="horizontal" android:layout_width="fill_parent"
4. android:layout_height="wrap_content" >
5. <ImageView android:id="@+id/icon" android:layout_width="wrap_content"
6. android:layout_height="fill_parent" android:layout_marginRight="6.0dip"
7. android:layout_alignParentTop="true" android:layout_alignParentBottom= "true" />
9. <TextView android:textAppearance="?android:textAppearanceMedium"
10. android:gravity="center_vertical" android:id="@+id/text"
11. android:textColor="#ffffff" android:layout_width="fill_parent"
12. android:layout_height="fill_parent" android:singleLine="true"
13. android:layout_toRightOf="@id/icon" android:layout_alignParentTop="true"
14. android:layout_alignParentBottom="true" />
15. </RelativeLayout>

TreeElement.java:

Java代码

1. package com.iaiai;
3. import java.util.ArrayList;
6. public classTreeElement {
8. private String id;
9. private String outlineTitle;
10. private booleanmhasParent;
11. private booleanmhasChild;
12. private TreeElement parent;
13. private intlevel;
14. private ArrayList<TreeElement> childList =newArrayList<TreeElement>();
16. public String getId() {
17. return id;
18. }
20. public voidsetId(String id) {
21. this .id = id;
22. }
24. public String getOutlineTitle() {
25. return outlineTitle;
26. }
28. public voidsetOutlineTitle(String outlineTitle) {
29. this .outlineTitle = outlineTitle;
30. }
32. public booleanisMhasParent() {
33. return mhasParent;
34. }
36. public voidsetMhasParent(booleanmhasParent) {
37. this .mhasParent = mhasParent;
38. }
40. public booleanisMhasChild() {
41. return mhasChild;
42. }
44. public voidsetMhasChild(booleanmhasChild) {
45. this .mhasChild = mhasChild;
46. }
48. public intgetLevel() {
49. return level;
50. }
52. public voidsetLevel(intlevel) {
53. this .level = level;
54. }
56. public booleanisExpanded() {
57. return expanded;
58. }
60. public voidsetExpanded(booleanexpanded) {
61. this .expanded = expanded;
62. }
64. public ArrayList<TreeElement> getChildList() {
65. return childList;
66. }
68. public TreeElement getParent() {
69. return parent;
70. }
72. public voidsetParent(TreeElement parent) {
73. this .parent = parent;
74. }
76. // private OutlineElement outlineElement;
77. private booleanexpanded;
79. public voidaddChild(TreeElement c) {
80. this .childList.add(c);
81. this .mhasParent = false;
82. this .mhasChild = true;
83. c.parent = this ;
84. c.level = this .level + 1;
86. }
88. public TreeElement(String id, String title) {
89. super ();
90. this .id = id;
91. this .outlineTitle = title;
92. this .level = 0;
93. this .mhasParent = true;
94. this .mhasChild = false;
95. this .parent = null;
96. }
98. public TreeElement(String id, String outlineTitle,booleanmhasParent,
99. boolean mhasChild, TreeElement parent,intlevel,booleanexpanded) {
100. super ();
101. this .id = id;
102. this .outlineTitle = outlineTitle;
103. this .mhasParent = mhasParent;
104. this .mhasChild = mhasChild;
105. this .parent = parent;
106. if (parent != null) {
107. this .parent.getChildList().add(this);
108. }
109. this .level = level;
110. this .expanded = expanded;
111. }
113. }

TreeView.java:

Java代码

1. package com.iaiai;
3. import java.util.ArrayList;
4. import java.util.List;
6. import android.app.ListActivity;
7. import android.content.Context;
8. import android.graphics.Bitmap;
9. import android.graphics.BitmapFactory;
10. import android.os.Bundle;
11. import android.util.Log;
12. import android.view.LayoutInflater;
13. import android.view.View;
14. import android.view.ViewGroup;
15. import android.widget.ArrayAdapter;
16. import android.widget.ImageView;
17. import android.widget.ListView;
18. import android.widget.TextView;
19. import android.widget.Toast;
22. public classTreeViewextendsListActivity {
23. private ArrayList<TreeElement> mPdfOutlinesCount =newArrayList<TreeElement>();
24. private TreeViewAdapter treeViewAdapter =null;
26. /** Called when the activity is first created. */
27. @Override
28. public voidonCreate(Bundle savedInstanceState) {
29. super .onCreate(savedInstanceState);
31. initialData();
32. treeViewAdapter = new TreeViewAdapter(this, R.layout.main,
33. mPdfOutlinesCount);
34. setListAdapter(treeViewAdapter);
35. registerForContextMenu(getListView());
36. }
38. private voidinitialData() {
39. TreeElement element1 = new TreeElement("01","关键类");
40. TreeElement element2 = new TreeElement("02","应用程序组件");
41. TreeElement element3 = new TreeElement("03","Activity和任务");
42. TreeElement element4 = new TreeElement("04","激活组件：intent");
43. TreeElement element5 = new TreeElement("05","关闭组件");
44. TreeElement element6 = new TreeElement("06","manifest文件");
45. TreeElement element7 = new TreeElement("07","Intent过滤器");
46. TreeElement element8 = new TreeElement("08","Affinity（吸引力）和新任务");
47. TreeElement element9 = new TreeElement("09","加载模式");
48. TreeElement element10 = new TreeElement("10","加载模式孩子1");
49. TreeElement element11 = new TreeElement("11","加载模式孩子2");
50. TreeElement element12 = new TreeElement("12","加载模式孩子2的孩子1");
51. TreeElement element13 = new TreeElement("13","加载模式孩子2的孩子2");
52. TreeElement element14 = new TreeElement("14","加载模式孩子1的孩子1");
53. TreeElement element15 = new TreeElement("15","加载模式孩子1的孩子2");
54. TreeElement element16 = new TreeElement("16","加载模式孩子1的孩子3");
55. TreeElement element17 = new TreeElement("17","加载模式孩子1的孩子4");
56. TreeElement element18 = new TreeElement("18","加载模式孩子1的孩子5");
57. TreeElement element19 = new TreeElement("19","加载模式孩子1的孩子6");
59. mPdfOutlinesCount.add(element1);
60. mPdfOutlinesCount.add(element2);
61. mPdfOutlinesCount.add(element9);
62. 
    
63. element2.addChild(element3);
64. 
    
65. element1.addChild(element4);
66. element1.addChild(element5);
67. element1.addChild(element6);
68. element1.addChild(element7);
69. 
    
70. element7.addChild(element8);
71. 
    
72. element9.addChild(element10);
73. element9.addChild(element11);
74. 
    
75. element11.addChild(element12);
76. element11.addChild(element13);
77. 
    
78. element10.addChild(element14);
79. element10.addChild(element15);
80. element10.addChild(element16);
81. element10.addChild(element17);
82. element10.addChild(element18);
83. element10.addChild(element19);
85. }
87. @SuppressWarnings ( "unchecked" )
88. private classTreeViewAdapterextendsArrayAdapter {
89. public TreeViewAdapter(Context context,inttextViewResourceId,
90. List objects) {
91. super (context, textViewResourceId, objects);
92. mInflater = LayoutInflater.from(context);
93. mfilelist = objects;
94. }
96. private LayoutInflater mInflater;
97. private List<TreeElement> mfilelist;
99. public intgetCount() {
100. return mfilelist.size();
101. }
103. public Object getItem( int position) {
104. return position;
105. }
107. public longgetItemId(intposition) {
108. return position;
109. }
111. public View getView(int position, View convertView, ViewGroup parent) {
     ViewHolder holder;
     if (convertView == null) {
     convertView = mInflater.inflate(R.layout.activity_main, null);
     holder = new ViewHolder();
     
     
     holder.text = (TextView) convertView.findViewById(R.id.text);
     holder.icon = (ImageView) convertView.findViewById(R.id.icon);
     
     
     convertView.setTag(holder);
     
     
     } else {
     holder = (ViewHolder) convertView.getTag();
     }
     
     
     final TreeElement obj = mfilelist.get(position);
     
     
     holder.text.setOnClickListener(new View.OnClickListener() {
     
     
     @Override
     public void onClick(View v) {
     Log.i("TreeView", "obj.id:" + obj.getOutlineTitle());
     }
     });
     
     
     holder.text.setText(obj.getOutlineTitle());
     
     
     if (obj.isMhasChild() && (obj.isExpanded() == false)) {
     holder.icon
     .setBackgroundResource(R.drawable.btn_check_on_selected);
     } else if (obj.isMhasChild() && (obj.isExpanded() == true)) {
     holder.icon
     .setBackgroundResource(R.drawable.btn_check_on_pressed);
     } else if (!obj.isMhasChild()) {
     holder.icon.setBackgroundResource(R.drawable.ic_action_search);
     }
     
     
     int level = obj.getLevel();
     convertView.setPadding(25 * (level + 1),
     holder.icon.getPaddingTop(), 0,
     holder.icon.getPaddingBottom());
     
     
     return convertView;
     }
114. class ViewHolder {
115. TextView text;
116. ImageView icon;
118. }
119. }
121. @Override
122. protected voidonListItemClick(ListView l, View v,intposition,longid) {
123. super .onListItemClick(l, v, position, id);
124. Log.i("TreeView" , "position:"+ position);
125. if (!mPdfOutlinesCount.get(position).isMhasChild()) {
126. Toast.makeText(this , mPdfOutlinesCount.get(position)
127. .getOutlineTitle(), 2000 );
130. return ;
131. }
133. if (mPdfOutlinesCount.get(position).isExpanded()) {
134. mPdfOutlinesCount.get(position).setExpanded(false);
135. TreeElement element = mPdfOutlinesCount.get(position);
136. ArrayList<TreeElement> temp = new ArrayList<TreeElement>();
138. for ( inti = position +1; i < mPdfOutlinesCount.size(); i++) {
139. if (element.getLevel() >= mPdfOutlinesCount.get(i).getLevel()) {
140. break ;
141. }
142. temp.add(mPdfOutlinesCount.get(i));
143. }
145. mPdfOutlinesCount.removeAll(temp);
147. treeViewAdapter.notifyDataSetChanged();
150. } else {
151. TreeElement obj = mPdfOutlinesCount.get(position);
152. obj.setExpanded(true );
153. int level = obj.getLevel();
154. int nextLevel = level + 1;
156. for (TreeElement element : obj.getChildList()) {
157. element.setLevel(nextLevel);
158. element.setExpanded(false );
159. mPdfOutlinesCount.add(position + 1 , element);
161. }
162. treeViewAdapter.notifyDataSetChanged();
164. }
165. }
167. }