• 6.listview显示不用条目

    文件夹页面

    布局只有一个listview，可以继承listactivity，这样少写一个布局文件
    tool:
    1. 	 * @param index 箱子的索引值
    2. 	 * @return
    3. 	 * 对应的uri 或null 
    4. 	 */
    5. 	public static  Uri getUriFromIndex(int index){
    6. 		switch (index) {
    7. 		case 0:
    8. 			return MyConstants.URI_INBOX;
    9. 		case 1:
    10. 			return MyConstants.URI_OUTBOX;
    11. 		case 2:
    12. 			return MyConstants.URI_DRAFT;
    13. 		case 3:
    14. 			return MyConstants.URI_SENT;
    16. 		}
    17. 		return null;
    18. 	}
    FolderUI :可以用%来改变条目的颜色
    1. public class FolderUI extends ListActivity implements OnItemClickListener{
    2. 	
    3. 	private ListView listView;
    4. 	
    5. 	private String [] names={"收件箱","发件箱","草稿箱","已发送"};
    6. 	
    7. 	private int[] iconIds={R.drawable.a_f_inbox,R.drawable.a_f_outbox,R.drawable.a_f_draft,R.drawable.a_f_sent};
    8. 	
    9. 	private int [] counts=new int[4];
    11. 	public Context ctx;
    12. 	
    13. 	@Override
    14. 	protected void onCreate(Bundle savedInstanceState) {
    15. 		super.onCreate(savedInstanceState);
    16. 		
    17. 		ctx = this;
    18. 		listView = getListView();
    19. 		adapter = new FolderListAdapter();
    20. 		listView.setAdapter(adapter);
    21. 		
    22. 		prepareData();
    23. 		
    24. 		listView.setOnItemClickListener(this);
    25. 		
    26. 	}
    27. 	
    28. 	private void prepareData() {
    29. 		MyQueryHandler myQueryHandler = new MyQueryHandler(getContentResolver());
    30. 		
    31. 		for (int i = 0; i <4; i++) {
    32. 			
    33. 			myQueryHandler.startQuery(i, null, Tools.getUriFromIndex(i), new String[]{" count(*) "}, null, null, null);
    34. 		}
    35. 		
    36. 		myQueryHandler.setOnCursorChangedListener(new MyQueryHandler.IOnCursorChangedListener() {
    37. 			
    38. 			@Override
    39. 			public void onCursorChanged(int token, Object cookie, Cursor cursor) {
    40. 				//移动至第一行
    41. 				cursor.moveToFirst();
    42. 				// 获得短信的个数
    43. 				int count = cursor.getInt(0); // 仅查询 短信的条数，仅返回一列 
    44. 				// 以 token 为counts的下标，存短信个数
    45. 				counts[token] = count;
    46. 				//刷新listView 
    47. 				adapter.notifyDataSetChanged();
    48. 			}
    49. 		});
    50. 	}
    52. 	private FolderListAdapter adapter;
    53. 	
    54. 	class FolderListAdapter extends BaseAdapter{
    56. 		@Override
    57. 		public int getCount() {
    58. 			return names.length;
    59. 		}
    61. 		@Override
    62. 		public Object getItem(int position) {
    63. 			return null;
    64. 		}
    66. 		@Override
    67. 		public long getItemId(int position) {
    68. 			return 0;
    69. 		}
    71. 		@Override
    72. 		public View getView(int position, View convertView, ViewGroup parent) {
    73. 			View  view;
    74. 			if(convertView == null){
    75. 				view = View.inflate(ctx, R.layout.list_item_folder, null);
    76. 			}else{
    77. 				view = convertView;
    78. 			}
    79. 			
    80. 			ImageView icon = (ImageView) view.findViewById(R.id.iv_icon_folder);
    81. 			TextView name = (TextView) view.findViewById(R.id.tv_name_folder);
    82. 			TextView count = (TextView) view.findViewById(R.id.tv_count_folder);
    83. 			
    84. 			icon.setBackgroundResource(iconIds[position]);
    85. 			name.setText(names[position]);
    86. 			count.setText(""+counts[position]);
    87. 			
    88. 			// 改变item的背景
    89. 			if(position%2 == 0){
    90. 				view.setBackgroundColor(Color.WHITE);
    91. 			}else{
    92. 				view.setBackgroundColor(Color.GRAY);
    93. 			}
    95. 			return view;
    96. 		}
    97. 		
    98. 	}
    100. 	@Override
    101. 	/**
    102. 	 * 响应listview 条目点击事件
    103. 	 */
    104. 	public void onItemClick(AdapterView<?> parent, View view, int position,
    105. 			long id) {
    106. 		
    107. 		Intent intent = new Intent(this,FolderDetail.class);
    108. 		
    109. 		intent.putExtra("position", position);
    110. 		startActivity(intent);
    111. 		
    112. 	}
    114. }
    文件夹详情页：listview的条目都带着上面的一条的，解决方法
    1. 每个条目判断和上一个条目是否是同一天，不是显示，是隐藏，但是会不停的判读
    2. 在获取日期信息的时候保存到集合，不是同一天就保存，用第二种，缺点一次性全部取出效率不高

    1. public class FolderDetail extends Activity implements OnClickListener{
    2. 	
    3. 	private ListView listView;
    4. 	
    5. 	/**
    6. 	 * 在文件夹页面，点击listView的位置
    7. 	 */
    8. 	private int position;
    9. 	
    10. 	@Override
    11. 	protected void onCreate(Bundle savedInstanceState) {
    12. 		super.onCreate(savedInstanceState);
    13. 		
    14. 		position = getIntent().getIntExtra("position", 0);
    15. 		
    16. 		setContentView(R.layout.activity_folder_detail);
    17. 		
    18. 		findViewById(R.id.btn_send).setOnClickListener(this);
    19. 		
    20. 		listView  = (ListView) findViewById(R.id.lv_folder_detail);
    21. 		adapter = new FolderDetailListAdapter(this, null);
    22. 		listView.setAdapter(adapter);
    23. 		
    24. 		showPositionSet = new HashSet<Integer>();
    25. 		
    26. 		prepareData();
    27. 	
    28. 	}
    29. 	
    30. 	/**
    31. 	 * 要查询的列
    32. 	 */
    33. 	private String[] projection={
    34. 			"body","_id","address","date"
    35. 	};
    36. 	
    37. 	/**
    38. 	 * 短信内容所在列的索引值 为 0
    39. 	 */
    40. 	private final int INDEX_BODY = 0;
    41. 	/**
    42. 	 * 短信联系人电话所在列的索引值 为 3
    43. 	 */
    44. 	private final int INDEX_ADDRESS = 2;
    45. 	/**
    46. 	 * 短信日期所在列的索引值 为 4
    47. 	 */
    48. 	private final int INDEX_DATE = 3;
    49. 	
    50. 	
    51. 	private void prepareData() {
    52. 		MyQueryHandler myQueryHandler =new MyQueryHandler(getContentResolver());
    53. 		myQueryHandler.startQuery(99, adapter, Tools.getUriFromIndex(position),
    54. 				projection, null, null, " date desc");
    55. 		
    56. 		myQueryHandler.setOnCursorChangedListener(new MyQueryHandler.IOnCursorChangedListener() {
    57. 			
    58. 			@Override
    59. 			public void onCursorChanged(int token, Object cookie, Cursor cursor) {
    60. 				//遍历curosr 将需要显示标题的条目的位置，保存在 showPositionSet 
    61. 				
    62. 				cursor.moveToPosition(-1);// 将cursor 移动到-1 的位置，方便遍历cursor
    63. 				
    64. 				showPositionSet.clear(); // 清空集合
    65. 				
    66. 				long lastDay=0;
    67. 				long thisDay=0;
    68. 				
    69. 				while(cursor.moveToNext()){
    70. 					thisDay=cursor.getLong(INDEX_DATE);
    71. 					
    72. 					if(!isSameToday(lastDay, thisDay)){ // 如果二个时间表示的不是同一天
    73. 						// 将当前cursor 的行数，保存至集合
    74. 						
    75. 						showPositionSet.add(cursor.getPosition());
    76. 					}
    77. 					
    78. 					lastDay = thisDay;
    79. 				}
    80. 				
    81. 				// 刷新listView 
    82. 				adapter.notifyDataSetChanged();
    83. 			}
    84. 		});
    85. 	}
    87.     /**
    88.      * @return true 如果 二人长型数字，表示的是同一天
    89.      */
    90.     public boolean isSameToday(long lastDay,long thisDay) {
    91.         Time time = new Time();
    92.         time.set(lastDay);
    93.         
    94.         int thenYear = time.year;
    95.         int thenMonth = time.month;
    96.         int thenMonthDay = time.monthDay;
    98.         time.set(thisDay);
    99.         return (thenYear == time.year)
    100.                 && (thenMonth == time.month) 
    101.                 && (thenMonthDay == time.monthDay);
    102.     }
    103. 	
    104. 	
    105. 	/**
    106. 	 * 应该显示标题的位置的集合
    107. 	 */
    108. 	private HashSet<Integer> showPositionSet;
    109. 	
    110. 	
    111. 	private FolderDetailListAdapter adapter ;
    113. 	class FolderDetailListAdapter extends CursorAdapter{
    115. 		public FolderDetailListAdapter(Context context, Cursor c) {
    116. 			super(context, c);
    117. 		}
    119. 		@Override
    120. 		public View newView(Context context, Cursor cursor, ViewGroup parent) {
    121. 			View view = View.inflate(context, R.layout.list_item_folder_detail, null);
    122. 			FolderDetailViewHolder vh = new FolderDetailViewHolder();
    123. 			
    124. 			vh.title = (TextView) view.findViewById(R.id.tv_title_list_item);
    125. 			
    126. 			vh.face = (ImageView) view.findViewById(R.id.iv_face_list_item);
    127. 			vh.address = (TextView) view.findViewById(R.id.tv_address_list_item);
    128. 			vh.body = (TextView) view.findViewById(R.id.tv_body_list_item);
    129. 			vh.date = (TextView) view.findViewById(R.id.tv_date_list_item);
    130. 			
    131. 			view.setTag(vh);
    132. 			
    133. 			return view;
    134. 		}
    136. 		@Override
    137. 		public void bindView(View view, Context context, Cursor cursor) {
    138. 			FolderDetailViewHolder vh = (FolderDetailViewHolder) view.getTag();
    139. 			
    140. 			//TODO  
    141. 			//设置短信内容
    142. 			vh.body.setText(cursor.getString(INDEX_BODY));
    143. 			
    144. 			//设置时间
    145. 			long when = cursor.getLong(INDEX_DATE);
    146. 			String dateStr;
    147. 			if(DateUtils.isToday(when)){
    148. 				dateStr = DateFormat.getTimeFormat(context).format(when);
    149. 			}else{
    150. 				dateStr = DateFormat.getDateFormat(context).format(when);
    151. 			}
    152. 			vh.date.setText(dateStr);
    153. 			
    154. 			//设置联系人的名
    155. 			String number = cursor.getString(INDEX_ADDRESS);
    156. 			String name = Tools.findNameByNumber(context, number);
    157. 			if(name == null){//无此联系人
    158. 				vh.address.setText(number);
    159. 			}else{
    160. 				vh.address.setText(name);
    161. 			}
    162. 			
    163. 			// 设置头像
    164. 			
    165. 			int contactId = Tools.findIDByNumber(context, number);
    166. 			if(contactId == -1){ // 无此联系人
    167. 				vh.face.setBackgroundResource(R.drawable.ic_unknow_contact_picture);
    168. 			}else{
    169. 				Bitmap bitmap = Tools.getFaceById(context, ""+contactId);
    170. 				if(bitmap ==null){//联系人，无头像
    171. 					vh.face.setBackgroundResource(R.drawable.ic_contact_picture);
    172. 				}else{
    173. 					vh.face.setBackgroundDrawable(new BitmapDrawable(bitmap));
    174. 				}
    175. 			}
    176. 			
    177. 			// 设置标题 
    178. 			
    179. 			if(showPositionSet.contains(cursor.getPosition())){ // 如果集合中包含此行，那么，就显示标题 ，
    180. 				
    181. 				vh.title.setText(DateFormat.getDateFormat(context).format(when));
    182. 				
    183. 				vh.title.setVisibility(View.VISIBLE);
    184. 			}else{
    185. 				// 否则，就隐藏标题 
    186. 				vh.title.setVisibility(View.GONE);
    187. 			}
    188. 			
    189. 			
    190. 		}
    191. 		
    192. 	}
    193. 	
    194. 	class FolderDetailViewHolder{
    195. 		
    196. 		public TextView title;
    197. 		
    198. 		public ImageView face;
    199. 		public TextView address;
    200. 		public TextView body;
    201. 		public TextView date;
    202. 		
    203. 	}
    204. 	
    205. 	
    206. 	@Override
    207. 	/**
    208. 	 * 响应新建信息的点击事件
    209. 	 */
    210. 	public void onClick(View v) {
    211. 		
    212. 		Intent intent = new Intent(this,NewMessageUI.class);
    213. 		startActivity(intent);
    214. 	}
    216. }
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  • 原文地址：https://www.cnblogs.com/sixrain/p/4994967.html
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