多选(An-Beer工作室).docx

1. 2. 6. 7. 12. 13. 复制代码有了上面的两个文件，就可以写Activity了下面的是源码： 1. package com.heji.demo.effect;2.3. import java.util.ArrayList;4. import java.util.HashMap;5. import java.util.List;6. import java.util.Map;7.8. import android.app.Activity;9. import android.content.Context;10. import android.os.Bundle;11. import android.view.LayoutInflater;12. import android.view.View;13. import android.view.ViewGroup;14. import android.widget.AdapterView;15. import android.widget.CheckBox;16. import android.widget.ListView;17. import android.widget.SimpleAdapter;18. import android.widget.TextView;19. import android.widget.AdapterView.OnItemClickListener;20.21. import com.heji.demo.R;22.23. public class MultipleChoiceActivity extends Activity implements OnItemClickListener24. 25. private MyAdapter mSimpleAdapter;26. 27. public final static String NAME = name; 28. public final static String PHONE_NUMBER = phone; 29.30. Override31. protected void onCreate(Bundle savedInstanceState) 32. super.onCreate(savedInstanceState);33. 34. setTitle(带有多选的Listview);35. 36. setContentView(R.layout.multiple_checkbox_main);37. 38. ListView listView = (ListView) findViewById(R.id.listview);39. 40. ArrayListMap al = new ArrayListMap();41. Map map1 = new HashMap();42. 43. map1.put(NAME, A);44. map1.put(PHONE_NUMBER, 132456789);45. al.add(map1);46. 47. Map map2 = new HashMap();48. map2.put(NAME, B);49. map2.put(PHONE_NUMBER, 132134);50. al.add(map2);51. 52. Map map3 = new HashMap();53. map3.put(NAME, C);54. map3.put(PHONE_NUMBER, 132134);55. al.add(map3);56. 57. Map map4 = new HashMap();58. map4.put(NAME, D);59. map4.put(PHONE_NUMBER, 132134);60. al.add(map4);61. 62. Map map5 = new HashMap();63. map5.put(NAME, E);64. map5.put(PHONE_NUMBER, 132134);65. al.add(map5);66. 67. Map map6 = new HashMap();68. map6.put(NAME, F);69. map6.put(PHONE_NUMBER, 132134);70. al.add(map6);71. 72. Map map7 = new HashMap();73. map7.put(NAME, G);74. map7.put(PHONE_NUMBER, 132134);75. al.add(map7);76. 77. 78. Map map8 = new HashMap();79. map8.put(NAME, H);80. map8.put(PHONE_NUMBER, 132134);81. al.add(map8);82. 83. Map map9 = new HashMap();84. map9.put(NAME, I);85. map9.put(PHONE_NUMBER, 132134);86. al.add(map9);87. 88. Map map10 = new HashMap();89. map10.put(NAME, J);90. map10.put(PHONE_NUMBER, 132134);91. al.add(map10);92. 93. Map map11 = new HashMap();94. map11.put(NAME, K);95. map11.put(PHONE_NUMBER, 132134);96. al.add(map11);97. 98. 99. String from = NAME, PHONE_NUMBER ;100. int to = R.id.multiple_title, R.id.multiple_summary ;101. mSimpleAdapter = new MyAdapter(this, al, R.layout.multiple_checkbox_main_row, from, to);102. 103. listView.setAdapter(mSimpleAdapter);104. listView.setOnItemClickListener(this);105. 106.107. Override108. public void onItemClick(AdapterView parent, View view, int position, long id) 109. CheckBox checkBox = (CheckBox) view.findViewById(R.id.multiple_checkbox);110. 111. checkBox.toggle();112. 113. mSimpleAdapter.map.put(position, checkBox.isChecked();114. 115. 116. 117. public class MyAdapter extends SimpleAdapter 118. 119. Map map; 120. 121. LayoutInflater mInflater;122. 123. private List? extends Map mList;124. 125. public MyAdapter(Context context, ListMap data,126. int resource, String from, int to) 127. super(context, data, resource, from, to);128. map = new HashMap();129. mInflater = LayoutInflater.from(context);130. mList = data;131. for(int i = 0; i data.size(); i+) 132. map.put(i, false);133. 134. 135. 136. Override137. public int getCount() 138. return mList.size();139. 140.141. Override142. public Object getItem(int position) 143. return position;144. 145.146. Override147. public long getItemId(int position) 148. return position;149. 150. 151. Override152. public View getView(int position, View convertView, ViewGroup parent) 153. if(convertView = null) 154. convertView = mInflater.inflate(R.layout.multiple_checkbox_main_row, null);155. 156. TextView tN = (TextView) convertView.findViewById(R.id.multiple_title);157. tN.setText(String)mList.get(position).get(NAME);158. 159. TextView tP = (TextView) convertView.findViewById(R.id.multiple_summary);160. tP.setText(String)mList.get(position).get(PHONE_NUMBER);161. 162. CheckBox checkBox = (CheckBox) convertView.findViewById(R.id.multiple_checkbox);163. 164. checkBox.setChecked(map.get(position); 165. 166. return convertView;167. 168. 169. 170.171. 复制代码下面我来分析为什么要用map来保存checkbox的状态。这个与ListView的刷新机制有关，当你的listview对象很多的时候，每次你拖动listview上下滚动，listview都会刷新一次。怎么刷新呢？比如一个屏幕它最多只显示七条listview，如果你有十条数据，当你想看第八条时，第一条数据理所当然的要被隐藏掉，而第八条数据会被显示，这时listview就刷新了。如果你不保存你所选的checkbox的状态，这时如果你选的是第一条的checkbo