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;

}

[/code]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);

}

}

[/code]文件夹详情页：listview的条目都带着上面的一条的，解决方法
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
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);

}

}

[/code]

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