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:

	 * @param index 箱子的索引值
	 * @return
	 * 对应的uri 或null 
	 */
	public static  Uri getUriFromIndex(int index){
		switch (index) {
		case 0:
			return MyConstants.URI_INBOX;
		case 1:
			return MyConstants.URI_OUTBOX;
		case 2:
			return MyConstants.URI_DRAFT;
		case 3:
			return MyConstants.URI_SENT;

		}
		return null;
	}

FolderUI :可以用%来改变条目的颜色

public class FolderUI extends ListActivity implements OnItemClickListener{
	
	private ListView listView;
	
	private String [] names={"收件箱","发件箱","草稿箱","已发送"};
	
	private int[] iconIds={R.drawable.a_f_inbox,R.drawable.a_f_outbox,R.drawable.a_f_draft,R.drawable.a_f_sent};
	
	private int [] counts=new int[4];

	public Context ctx;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		
		ctx = this;
		listView = getListView();
		adapter = new FolderListAdapter();
		listView.setAdapter(adapter);
		
		prepareData();
		
		listView.setOnItemClickListener(this);
		
	}
	
	private void prepareData() {
		MyQueryHandler myQueryHandler = new MyQueryHandler(getContentResolver());
		
		for (int i = 0; i <4; i++) {
			
			myQueryHandler.startQuery(i, null, Tools.getUriFromIndex(i), new String[]{" count(*) "}, null, null, null);
		}
		
		myQueryHandler.setOnCursorChangedListener(new MyQueryHandler.IOnCursorChangedListener() {
			
			@Override
			public void onCursorChanged(int token, Object cookie, Cursor cursor) {
				//移动至第一行
				cursor.moveToFirst();
				// 获得短信的个数
				int count = cursor.getInt(0); // 仅查询 短信的条数，仅返回一列 
				// 以 token 为counts的下标，存短信个数
				counts[token] = count;
				//刷新listView 
				adapter.notifyDataSetChanged();
			}
		});
	}

	private FolderListAdapter adapter;
	
	class FolderListAdapter extends BaseAdapter{

		@Override
		public int getCount() {
			return names.length;
		}

		@Override
		public Object getItem(int position) {
			return null;
		}

		@Override
		public long getItemId(int position) {
			return 0;
		}

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			View  view;
			if(convertView == null){
				view = View.inflate(ctx, R.layout.list_item_folder, null);
			}else{
				view = convertView;
			}
			
			ImageView icon = (ImageView) view.findViewById(R.id.iv_icon_folder);
			TextView name = (TextView) view.findViewById(R.id.tv_name_folder);
			TextView count = (TextView) view.findViewById(R.id.tv_count_folder);
			
			icon.setBackgroundResource(iconIds[position]);
			name.setText(names[position]);
			count.setText(""+counts[position]);
			
			// 改变item的背景
			if(position%2 == 0){
				view.setBackgroundColor(Color.WHITE);
			}else{
				view.setBackgroundColor(Color.GRAY);
			}

			return view;
		}
		
	}

	@Override
	/**
	 * 响应listview 条目点击事件
	 */
	public void onItemClick(AdapterView<?> parent, View view, int position,
			long id) {
		
		Intent intent = new Intent(this,FolderDetail.class);
		
		intent.putExtra("position", position);
		startActivity(intent);
		
	}

}

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

public class FolderDetail extends Activity implements OnClickListener{
	
	private ListView listView;
	
	/**
	 * 在文件夹页面，点击listView的位置
	 */
	private int position;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		
		position = getIntent().getIntExtra("position", 0);
		
		setContentView(R.layout.activity_folder_detail);
		
		findViewById(R.id.btn_send).setOnClickListener(this);
		
		listView  = (ListView) findViewById(R.id.lv_folder_detail);
		adapter = new FolderDetailListAdapter(this, null);
		listView.setAdapter(adapter);
		
		showPositionSet = new HashSet<Integer>();
		
		prepareData();
	}
	
	/**
	 * 要查询的列
	 */
	private String[] projection={
			"body","_id","address","date"
	};
	
	/**
	 * 短信内容所在列的索引值 为 0
	 */
	private final int INDEX_BODY = 0;
	/**
	 * 短信联系人电话所在列的索引值 为 3
	 */
	private final int INDEX_ADDRESS = 2;
	/**
	 * 短信日期所在列的索引值 为 4
	 */
	private final int INDEX_DATE = 3;
	
	
	private void prepareData() {
		MyQueryHandler myQueryHandler =new MyQueryHandler(getContentResolver());
		myQueryHandler.startQuery(99, adapter, Tools.getUriFromIndex(position),
				projection, null, null, " date desc");
		
		myQueryHandler.setOnCursorChangedListener(new MyQueryHandler.IOnCursorChangedListener() {
			
			@Override
			public void onCursorChanged(int token, Object cookie, Cursor cursor) {
				//遍历curosr 将需要显示标题的条目的位置，保存在 showPositionSet 
				
				cursor.moveToPosition(-1);// 将cursor 移动到-1 的位置，方便遍历cursor
				
				showPositionSet.clear(); // 清空集合
				
				long lastDay=0;
				long thisDay=0;
				
				while(cursor.moveToNext()){
					thisDay=cursor.getLong(INDEX_DATE);
					
					if(!isSameToday(lastDay, thisDay)){ // 如果二个时间表示的不是同一天
						// 将当前cursor 的行数，保存至集合
						
						showPositionSet.add(cursor.getPosition());
					}
					
					lastDay = thisDay;
				}
				
				// 刷新listView 
				adapter.notifyDataSetChanged();
			}
		});
	}

    /**
     * @return true 如果 二人长型数字，表示的是同一天
     */
    public boolean isSameToday(long lastDay,long thisDay) {
        Time time = new Time();
        time.set(lastDay);
        
        int thenYear = time.year;
        int thenMonth = time.month;
        int thenMonthDay = time.monthDay;

        time.set(thisDay);
        return (thenYear == time.year)
                && (thenMonth == time.month) 
                && (thenMonthDay == time.monthDay);
    }
	
	
	/**
	 * 应该显示标题的位置的集合
	 */
	private HashSet<Integer> showPositionSet;
	
	
	private FolderDetailListAdapter adapter ;

	class FolderDetailListAdapter extends CursorAdapter{

		public FolderDetailListAdapter(Context context, Cursor c) {
			super(context, c);
		}

		@Override
		public View newView(Context context, Cursor cursor, ViewGroup parent) {
			View view = View.inflate(context, R.layout.list_item_folder_detail, null);
			FolderDetailViewHolder vh = new FolderDetailViewHolder();
			
			vh.title = (TextView) view.findViewById(R.id.tv_title_list_item);
			
			vh.face = (ImageView) view.findViewById(R.id.iv_face_list_item);
			vh.address = (TextView) view.findViewById(R.id.tv_address_list_item);
			vh.body = (TextView) view.findViewById(R.id.tv_body_list_item);
			vh.date = (TextView) view.findViewById(R.id.tv_date_list_item);
			
			view.setTag(vh);
			
			return view;
		}

		@Override
		public void bindView(View view, Context context, Cursor cursor) {
			FolderDetailViewHolder vh = (FolderDetailViewHolder) view.getTag();
			
			//TODO  
			//设置短信内容
			vh.body.setText(cursor.getString(INDEX_BODY));
			
			//设置时间
			long when = cursor.getLong(INDEX_DATE);
			String dateStr;
			if(DateUtils.isToday(when)){
				dateStr = DateFormat.getTimeFormat(context).format(when);
			}else{
				dateStr = DateFormat.getDateFormat(context).format(when);
			}
			vh.date.setText(dateStr);
			
			//设置联系人的名
			String number = cursor.getString(INDEX_ADDRESS);
			String name = Tools.findNameByNumber(context, number);
			if(name == null){//无此联系人
				vh.address.setText(number);
			}else{
				vh.address.setText(name);
			}
			
			// 设置头像
			
			int contactId = Tools.findIDByNumber(context, number);
			if(contactId == -1){ // 无此联系人
				vh.face.setBackgroundResource(R.drawable.ic_unknow_contact_picture);
			}else{
				Bitmap bitmap = Tools.getFaceById(context, ""+contactId);
				if(bitmap ==null){//联系人，无头像
					vh.face.setBackgroundResource(R.drawable.ic_contact_picture);
				}else{
					vh.face.setBackgroundDrawable(new BitmapDrawable(bitmap));
				}
			}
			
			// 设置标题 
			
			if(showPositionSet.contains(cursor.getPosition())){ // 如果集合中包含此行，那么，就显示标题 ，
				
				vh.title.setText(DateFormat.getDateFormat(context).format(when));
				
				vh.title.setVisibility(View.VISIBLE);
			}else{
				// 否则，就隐藏标题 
				vh.title.setVisibility(View.GONE);
			}
			
			
		}
		
	}
	
	class FolderDetailViewHolder{
		
		public TextView title;
		
		public ImageView face;
		public TextView address;
		public TextView body;
		public TextView date;
		
	}
	
	
	@Override
	/**
	 * 响应新建信息的点击事件
	 */
	public void onClick(View v) {
		
		Intent intent = new Intent(this,NewMessageUI.class);
		startActivity(intent);
	}

}

来自为知笔记(Wiz)