[转]Android ListView最佳处理方式，ListView拖动防重复数据显示，单击响应子控件

 

Android ListView最佳处理方式，ListView拖动防重复数据显示，单击响应子控件。

1、为了防止拖动ListView时，在列表末尾重复数据显示。需要加入 HashMap<Integer,View> lmap = new HashMap<Integer,View>();其中Integer为列表位置，View为子项视图，加入数据前首先if
(lmap.get(position)==null) ，满足条件时，加入lmap.put(position, convertView);如果条件不满足，convertView = lmap.get(position);

2、监听每个子控件时，一定要加入final int currentPosition=position;这样可以牢牢抓住每次点击的响应位置；最好把控件集成到类中。

1. package logic;
2. import java.util.HashMap;
3. import java.util.List;
4. import java.util.Map;
5. import logic.PlaceAdapter.ViewHolder;
6. import org.guiji.BigPictureActivity;
7. import org.guiji.ClassUserListActivity;
8. import org.guiji.CommentMoodActivity;
9. import org.guiji.R;
10. import org.guiji.UserHomeActivity;
11. import support.ClassUserListImageDownloadTask;
12. import support.ImageDownloadTask;
13. import support.SystemConstant;
14. import android.content.Context;
15. import android.content.Intent;
16. import android.text.Html;
17. import android.view.LayoutInflater;
18. import android.view.View;
19. import android.view.ViewGroup;
20. import android.view.View.OnClickListener;
21. import android.widget.BaseAdapter;
22. import android.widget.ImageView;
23. import android.widget.TextView;
24. public class ClassUserListAdapter extends BaseAdapter {
25. HashMap<Integer,View> lmap = new HashMap<Integer,View>();
26. private LayoutInflater mInflater=null;
27. private List<Map<String, String>> mData=null;
28. private ClassUserListImageDownloadTask imgtask=null;
29. private Context context;
30. public List<Map<String, String>> getmData() {
31. return mData;
32. }
33. public void setmData(List<Map<String, String>> mData) {
34. this.mData = mData;
35. }
36. public ClassUserListAdapter(Context context){
37. this.mInflater = LayoutInflater.from(context);
38. this.context=context;
39. }
40. @Override
41. public int getCount() {
42. return mData.size();
43. }
44. @Override
45. public Object getItem(int position) {
46. return mData.get(position);
47. }
48. @Override
49. public long getItemId(int position) {
50. return position;
51. }
52. @Override
53. public View getView(int position, View convertView, ViewGroup parent) {
54. ClassUserListViewHolder holder = null;
55. if (lmap.get(position)==null) {
56. imgtask=new ClassUserListImageDownloadTask();
57. convertView = mInflater.inflate(R.layout.classuserlist_item, null);
58. holder=new ClassUserListViewHolder();
59. holder.classuserlist_item_userlogo=(ImageView)convertView.findViewById(R.id.classuserlist_item_userlogo);
60. holder.classuserlist_item_username=(TextView)convertView.findViewById(R.id.classuserlist_item_username);
61. holder.classuserlist_item_statuscontent=(TextView)convertView.findViewById(R.id.classuserlist_item_statuscontent);
62. holder.classuserlist_item_idfans1=(TextView)convertView.findViewById(R.id.classuserlist_item_idfans1);
63. holder.classuserlist_item_idfans2=(TextView)convertView.findViewById(R.id.classuserlist_item_idfans2);
64. holder.classuserlist_item_idmood=(TextView)convertView.findViewById(R.id.classuserlist_item_idmood);
65. holder.classuserlist_item_idhuoyuevalue=(TextView)convertView.findViewById(R.id.classuserlist_item_idhuoyuevalue);
66. holder.classuserlist_item_msgpic=(ImageView)convertView.findViewById(R.id.classuserlist_item_msgpic);
67. holder.classuserlist_item_msgcontent=(TextView)convertView.findViewById(R.id.classuserlist_item_msgcontent);
68. holder.classuserlist_item_idtimeplace=(TextView)convertView.findViewById(R.id.classuserlist_item_idtimeplace);
69. holder.classuserlist_item_classbutton=(ImageView)convertView.findViewById(R.id.classuserlist_item_classbutton);
70. lmap.put(position, convertView);
71. convertView.setTag(holder);
72. holder.classuserlist_item_username.setText((String)mData.get(position).get("username"));
73. if(mData.get(position).get("idstatuscontent")!=null){
74. holder.classuserlist_item_statuscontent.setText((String)mData.get(position).get("idstatuscontent"));
75. holder.classuserlist_item_statuscontent.setVisibility(0);
76. }
77. if(mData.get(position).get("idfans1")!=null){
78. holder.classuserlist_item_idfans1.setText((String)mData.get(position).get("idfans1"));
79. holder.classuserlist_item_idfans1.setVisibility(0);
80. }
81. if(mData.get(position).get("idfans2")!=null){
82. holder.classuserlist_item_idfans2.setText((String)mData.get(position).get("idfans2"));
83. holder.classuserlist_item_idfans2.setVisibility(0);
84. }
85. holder.classuserlist_item_idmood.setText((String)mData.get(position).get("idmood"));
86. if(mData.get(position).get("idhuoyuevalue").length()>=4)
87. holder.classuserlist_item_idhuoyuevalue.setText("活跃值"+"("+mData.get(position).get("idhuoyuevalue").substring(0, 4)+")");
88. else
89. holder.classuserlist_item_idhuoyuevalue.setText("活跃值"+"("+mData.get(position).get("idhuoyuevalue")+"0"+")");
90. if(mData.get(position).get("idmsgcontent")!=null){
91. holder.classuserlist_item_msgcontent.setText((String)mData.get(position).get("idmsgcontent"));
92. holder.classuserlist_item_msgcontent.setVisibility(0);
93. }
94. if(mData.get(position).get("idtime")!=null){
95. holder.classuserlist_item_idtimeplace.setText((String)mData.get(position).get("idtime")+"  "+(String)mData.get(position).get("idplace"));
96. holder.classuserlist_item_idtimeplace.setVisibility(0);
97. }
98. String temp=SystemConstant.baseURLNone+mData.get(position).get("userlogo")+","+
99. SystemConstant.baseURLNone+mData.get(position).get("idmsgpic");
100. imgtask.execute(temp,holder);
101. }else {
102. convertView = lmap.get(position);
103. holder = (ClassUserListViewHolder)convertView.getTag();
104. }
105. final int currentPosition=position;
106. holder.classuserlist_item_userlogo.setOnClickListener(new OnClickListener() {
107. @Override
108. public void onClick(View v) {
109. MainService.guiji.setCurrentURL(SystemConstant.baseURL+mData.get(currentPosition).get("userLink"));
110. Intent it=new Intent(context,UserHomeActivity.class);
111. context.startActivity(it);
112. }
113. });
114. holder.classuserlist_item_username.setOnClickListener(new OnClickListener() {
115. @Override
116. public void onClick(View v) {
117. MainService.guiji.setCurrentURL(SystemConstant.baseURL+mData.get(currentPosition).get("userLink"));
118. Intent it=new Intent(context,UserHomeActivity.class);
119. context.startActivity(it);
120. }
121. });
122. holder.classuserlist_item_msgpic.setOnClickListener(new OnClickListener() {
123. @Override
124. public void onClick(View v) {
125. MainService.guiji.setCurrentURL(SystemConstant.baseURLNone+mData.get(currentPosition).get("idmsgpic"));
126. Intent it=new Intent(context,BigPictureActivity.class);
127. context.startActivity(it);
128. }
129. });
130. holder.classuserlist_item_idfans1.setOnClickListener(new OnClickListener() {
131. @Override
132. public void onClick(View v) {
133. MainService.guiji.deleteReply(SystemConstant.baseURL+mData.get(currentPosition).get("idfans1link"));
134. ((ClassUserListActivity) context).createTask();
135. }
136. });
137. holder.classuserlist_item_idfans2.setOnClickListener(new OnClickListener() {
138. @Override
139. public void onClick(View v) {
140. MainService.guiji.deleteReply(SystemConstant.baseURL+mData.get(currentPosition).get("idfans2link"));
141. ((ClassUserListActivity) context).createTask();
142. }
143. });
144. holder.classuserlist_item_classbutton.setOnClickListener(new OnClickListener() {
145. @Override
146. public void onClick(View v) {
147. String temp=SystemConstant.baseURL+mData.get(currentPosition).get("idcommentlink");
148. //              MainService.guiji.setCurrentURL(temp);
149. MainService.guiji.setPageType(4);
150. MainService.guiji.setBackURL(temp);
151. Intent it=new Intent(context,CommentMoodActivity.class);
152. context.startActivity(it);
153. }
154. });
155. return convertView;
156. }
157. public class ClassUserListViewHolder{
158. public ImageView classuserlist_item_userlogo;
159. public TextView classuserlist_item_username;
160. public TextView classuserlist_item_statuscontent;
161. public TextView classuserlist_item_idfans1;
162. public TextView classuserlist_item_idfans2;
163. public TextView classuserlist_item_idmood;
164. public TextView classuserlist_item_idhuoyuevalue;
165. public ImageView classuserlist_item_msgpic;
166. public TextView classuserlist_item_msgcontent;
167. public TextView classuserlist_item_idtimeplace;
168. public ImageView classuserlist_item_classbutton;
169. }
170. }