我在做什么 ::
问题 ::
DisplayBuffet_NotifyDataSetChanged_Fragment.java
public class DisplayBuffet_NotifyDataSetChanged_Fragment extends Fragment implements View.OnClickListener{
// Declaration
static ListView xmlFragmentListView;
static View layout;
static DisplayBuffetAsyncTask downloadTask=null;
Button btnRating,btnPrice,btnDistance;
private FileCache fileCache=null;
private MemoryCache memoryCache=null;
DisplayBuffetAdapter listViewAdapter;
static Bundle bundle=null;
DisplayBuffet_Json_Fragment fragment=null;
ArrayList<HashMap<String, String>> arrayListBuffet=null;
FindMyBuffetDatabaseHelper mHelper=null;;
SQLiteDatabase database=null;
public static DisplayBuffet_NotifyDataSetChanged_Fragment newInstance(FileCache _fileCache,MemoryCache _memoryCache) {
DisplayBuffet_NotifyDataSetChanged_Fragment fragment = new DisplayBuffet_NotifyDataSetChanged_Fragment();
bundle = new Bundle();
bundle.putSerializable(FindMyBuffetConstants.BUFFET_FILECACHE_KEY, _fileCache);
bundle.putSerializable(FindMyBuffetConstants.BUFFET_MEMORYCACHE_KEY, _memoryCache);
fragment.setArguments(bundle);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Retain this fragment across configuration changes.
setRetainInstance(true);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
layout = inflater.inflate(R.layout.display_buffets_fragment,container, false);
return layout;
}
private void initViews() {
fileCache = (FileCache) getArguments().getSerializable(FindMyBuffetConstants.BUFFET_FILECACHE_KEY);
memoryCache = (MemoryCache) getArguments().getSerializable(FindMyBuffetConstants.BUFFET_MEMORYCACHE_KEY);
xmlFragmentListView = ((ListView) layout.findViewById(R.id.sortrestaurantlistview));
btnRating=(Button) getActivity().findViewById(R.id.btnRating);
btnPrice=(Button) getActivity().findViewById(R.id.btnPrice);
btnDistance=(Button) getActivity().findViewById(R.id.btnDistance);
}
public void onActivityCreated(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onActivityCreated(savedInstanceState);
}
@Override
public void onStart() {
// TODO Auto-generated method stub
super.onStart();
arrayListBuffet = new ArrayList<HashMap<String, String>>();
mHelper = new FindMyBuffetDatabaseHelper(FindMyBuffetApplication.currentActivityContext);
database = mHelper.getWritableDatabase();
initViews();
btnRating.setOnClickListener(this);
btnPrice.setOnClickListener(this);
btnDistance.setOnClickListener(this);
setListViewAdapter();
}
@Override
public void onClick(View v) {
String strOrder="asc";
if (FindMyBuffetApplication.isRatingOrderByDesc == false && FindMyBuffetApplication.sortBy.equalsIgnoreCase(FindMyBuffetConstants.TAB_NAME_RATING)){
btnRating.setBackgroundResource(R.drawable.tab_button_foucs_asc);
btnPrice.setBackgroundResource(R.drawable.tab_button_default);
btnDistance.setBackgroundResource(R.drawable.tab_button_default);
}
else if (FindMyBuffetApplication.isPriceOrderByDesc == false && FindMyBuffetApplication.sortBy.equalsIgnoreCase(FindMyBuffetConstants.TAB_NAME_PRICE)){
btnPrice.setBackgroundResource(R.drawable.tab_button_foucs_asc);
btnRating.setBackgroundResource(R.drawable.tab_button_default);
btnDistance.setBackgroundResource(R.drawable.tab_button_default);
}
else if (FindMyBuffetApplication.isDistanceOrderByDesc == false && FindMyBuffetApplication.sortBy.equalsIgnoreCase(FindMyBuffetConstants.TAB_NAME_DISTANCE)){
btnDistance.setBackgroundResource(R.drawable.tab_button_foucs_asc);
btnRating.setBackgroundResource(R.drawable.tab_button_default);
btnPrice.setBackgroundResource(R.drawable.tab_button_default);
}
else if (FindMyBuffetApplication.isRatingOrderByDesc == true && FindMyBuffetApplication.sortBy.equalsIgnoreCase(FindMyBuffetConstants.TAB_NAME_RATING)){
btnRating.setBackgroundResource(R.drawable.tab_button_foucs_dec);
btnDistance.setBackgroundResource(R.drawable.tab_button_default);
btnPrice.setBackgroundResource(R.drawable.tab_button_default);
}
else if (FindMyBuffetApplication.isPriceOrderByDesc == true && FindMyBuffetApplication.sortBy.equalsIgnoreCase(FindMyBuffetConstants.TAB_NAME_PRICE)){
btnPrice.setBackgroundResource(R.drawable.tab_button_foucs_dec);
btnDistance.setBackgroundResource(R.drawable.tab_button_default);
btnRating.setBackgroundResource(R.drawable.tab_button_default);
}
else if (FindMyBuffetApplication.isDistanceOrderByDesc == true && FindMyBuffetApplication.sortBy.equalsIgnoreCase(FindMyBuffetConstants.TAB_NAME_DISTANCE)){
btnDistance.setBackgroundResource(R.drawable.tab_button_foucs_dec);
btnPrice.setBackgroundResource(R.drawable.tab_button_default);
btnRating.setBackgroundResource(R.drawable.tab_button_default);
}
switch(v.getId()) {
case R.id.btnRating:
FindMyBuffetApplication.sortBy = FindMyBuffetConstants.TAB_NAME_RATING;
if (FindMyBuffetApplication.isRatingOrderByDesc == false)
FindMyBuffetApplication.isRatingOrderByDesc = true;
else
FindMyBuffetApplication.isRatingOrderByDesc = false;
//displayView();
if(FindMyBuffetApplication.isRatingOrderByDesc==true)strOrder="desc";
sortListView(FindMyBuffetConstants.SORT_BY_RATING_1,strOrder);
break;
case R.id.btnPrice:
FindMyBuffetApplication.sortBy = FindMyBuffetConstants.TAB_NAME_PRICE;
if (FindMyBuffetApplication.isPriceOrderByDesc == false)
FindMyBuffetApplication.isPriceOrderByDesc = true;
else
FindMyBuffetApplication.isPriceOrderByDesc = false;
//displayView();
if(FindMyBuffetApplication.isPriceOrderByDesc==true)strOrder="desc";
sortListView(FindMyBuffetConstants.SORT_BY_PRICE_1,strOrder);
break;
case R.id.btnDistance:
FindMyBuffetApplication.sortBy = FindMyBuffetConstants.TAB_NAME_DISTANCE;
if (FindMyBuffetApplication.isDistanceOrderByDesc == false)
FindMyBuffetApplication.isDistanceOrderByDesc = true;
else
FindMyBuffetApplication.isDistanceOrderByDesc = false;
//displayView();
if(FindMyBuffetApplication.isPriceOrderByDesc==true)strOrder="desc";
sortListView(FindMyBuffetConstants.SORT_BY_DISTANCE_1,strOrder);
break;
}
}
private void setListViewAdapter(){
downloadTask = new DisplayBuffetAsyncTask();
if (FindMyBuffetApplication.sortBy == FindMyBuffetConstants.TAB_NAME_RATING){
if (FindMyBuffetApplication.isDownloading) {
downloadTask.initilizeAsyncTask(
getFragmentManager(), xmlFragmentListView,downloadTask,
fileCache,memoryCache);
downloadTask.execute();
}
}
else if (FindMyBuffetApplication.sortBy == FindMyBuffetConstants.TAB_NAME_PRICE){
if (FindMyBuffetApplication.isDownloading) {
downloadTask.initilizeAsyncTask(
getFragmentManager(), xmlFragmentListView,
downloadTask,
fileCache,memoryCache);
downloadTask.execute();
}
}
else if (FindMyBuffetApplication.sortBy == FindMyBuffetConstants.TAB_NAME_DISTANCE){
if (FindMyBuffetApplication.isDownloading) {
downloadTask.initilizeAsyncTask(
getFragmentManager(), xmlFragmentListView,
downloadTask,
fileCache,memoryCache);
downloadTask.execute();
}
}
listViewAdapter = new DisplayBuffetAdapter(arrayListBuffet, fileCache,memoryCache);
xmlFragmentListView.setAdapter(listViewAdapter);
}
private void sortListView(String strSortBy,String strOrder) {
arrayListBuffet.clear();
if (FindMyBuffetApplication.sortBy == FindMyBuffetConstants.TAB_NAME_RATING) {
SortBuffets(FindMyBuffetConstants.SORT_BY_RATING_1, strOrder);
} else if (FindMyBuffetApplication.sortBy == FindMyBuffetConstants.TAB_NAME_PRICE) {
SortBuffets(FindMyBuffetConstants.SORT_BY_PRICE_1, strOrder);
} else if (FindMyBuffetApplication.sortBy == FindMyBuffetConstants.TAB_NAME_DISTANCE) {
SortBuffets(FindMyBuffetConstants.SORT_BY_DISTANCE_1, strOrder);
}
listViewAdapter.notifyDataSetChanged();
}
/*@Override
public void onActivityCreated(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onActivityCreated(savedInstanceState);
}
@Override
public void onStart() {
// TODO Auto-generated method stub
super.onStart();
}*/
private void displayView() {
Fragment objFragment = getFragmentManager().findFragmentById(getId());
if (objFragment != null) {
getFragmentManager().beginTransaction().remove(objFragment).commit();
//objFragment = new SortBuffetRating();
objFragment = DisplayBuffet_Json_Fragment.newInstance(fileCache,memoryCache);
getFragmentManager().beginTransaction().add(R.id.frame_container, objFragment).commit();
} else {
//objFragment = new SortBuffetRating();
objFragment = DisplayBuffet_Json_Fragment.newInstance(fileCache,memoryCache);
getFragmentManager().beginTransaction().add(R.id.frame_container, objFragment).commit();
}
}
/*
* Displays data from SQLite
*/
private void SortBuffets(String strSortBy,String strOrder){
Cursor mCursor = database.rawQuery("select * from " + BuffetTable.TABLE_NAME_BUFFET + " order by " + strSortBy +" "+strOrder, null);
try {
// looping through all rows and adding to list
if (mCursor.moveToFirst()) {
do {
HashMap<String, String> map=new HashMap<String, String>();
map.put(BuffetTable.COLUMN_ID,mCursor.getString(0));
map.put(BuffetTable.COLUMN_BUF_OFF_ID,mCursor.getString(1));
map.put(BuffetTable.COLUMN_FROM_TIME,mCursor.getString(2));
map.put(BuffetTable.COLUMN_TO_TIME,mCursor.getString(3));
map.put(BuffetTable.COLUMN_ONLINE_PRICE,mCursor.getString(4));
map.put(BuffetTable.COLUMN_RESERVED_PRICE,mCursor.getString(5));
map.put(BuffetTable.COLUMN_BUF_IMAGE_FILE_NAME,mCursor.getString(6));
map.put(BuffetTable.COLUMN_RES_NAME,mCursor.getString(7));
map.put(BuffetTable.COLUMN_RATING,mCursor.getString(8));
map.put(BuffetTable.COLUMN_LATITUDE,mCursor.getString(9));
map.put(BuffetTable.COLUMN_LONGITUDE,mCursor.getString(10));
map.put(BuffetTable.COLUMN_BUF_TYPE_NAME,mCursor.getString(11));
arrayListBuffet.add(map);
} while (mCursor.moveToNext());
}
}catch (SQLiteException e){
Log.i(FindMyBuffetApplication.applicationName+"."+FindMyBuffetConstants.PACKAGE_NAME+"."+FindMyBuffetConstants.PACKAGE_NAME,"Error Druing Sorting Buffets "+ e.getMessage());
e.printStackTrace();
Toast.makeText(FindMyBuffetApplication.currentActivityContext, "Error Druing Sorting The Buffets By" +strSortBy,Toast.LENGTH_LONG).show();
}catch (Exception e) {
Log.i(FindMyBuffetApplication.applicationName+"."+FindMyBuffetConstants.PACKAGE_NAME+"."+FindMyBuffetConstants.PACKAGE_NAME,"Error Druing Sorting Buffets "+ e.getMessage());
e.printStackTrace();
Toast.makeText(FindMyBuffetApplication.currentActivityContext, "Error Druing Sorting The Buffets By" +strSortBy,Toast.LENGTH_LONG).show();
}finally {
// Release the memory
mCursor.close();
}
}
@Override
public void onDestroy() {
super.onDestroy();
database.close();
//layout = null; // now cleaning up!
//bundle = null;
/*fragment = null;
if (downloadTask != null && downloadTask.getStatus() != AsyncTask.Status.FINISHED)
downloadTask=null;*/
}
}
DisplayBuffetAdapter.java
public class DisplayBuffetAdapter extends BaseAdapter {
// Declare Variables
ImageLoader imageLoader;
ArrayList<HashMap<String, String>> arrayListBuffet;
LayoutInflater inflater;
FileCache fileCache=null;
MemoryCache memoryCache=null;
int tmpLoopCnt=0;
public DisplayBuffetAdapter(ArrayList<HashMap<String, String>> _arraylist,FileCache _fileCache,MemoryCache _memoryCache) {
this.arrayListBuffet = _arraylist;
this.fileCache=_fileCache;
this.memoryCache=_memoryCache;
this.imageLoader=new ImageLoader(FindMyBuffetApplication.currentActivityContext,fileCache,memoryCache);
tmpLoopCnt=0;
}
public int getCount() {
return arrayListBuffet.size();
}
public Object getItem(int position) {
return arrayListBuffet.get(position);
}
public long getItemId(int position) {
return position;
}
private class ViewHolder {
// Declare Variables
ImageView imgRestBuffLogo;
TextView txtResName;
TextView txtRestBufType;
TextView txtRestTime;
TextView txtRestDistance;
TextView txtReservePrice;
TextView txtOnlinePrice;
RatingBar restRatingBar;
Button btnOnlinePrice;
Button btnReservedPrice;
}
public View getView(int position, View convertView, ViewGroup parent) {
tmpLoopCnt = tmpLoopCnt + 1;
Log.i("LIST VIEW ADAPATER COUNT", ""+tmpLoopCnt);
ViewHolder holder;
LayoutInflater inflater;
if (convertView == null) {
inflater = (LayoutInflater) FindMyBuffetApplication.currentActivityContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.display_buffet_listview, null);
holder = new ViewHolder();
Typeface txtResnameFontFace=Typeface.createFromAsset(FindMyBuffetApplication.currentActivityContext.getAssets(), "Roboto-Bold.ttf");
Typeface txtRestBufTypeFontFace=Typeface.createFromAsset(FindMyBuffetApplication.currentActivityContext.getAssets(), "Roboto-Medium.ttf");
Typeface txtRestTimeFontFace=Typeface.createFromAsset(FindMyBuffetApplication.currentActivityContext.getAssets(), "Roboto-Bold.ttf");
//Typeface txtReservePrice=Typeface.createFromAsset(FindMyBuffetApplicationCls.currentActivityContext.getAssets(),"Roboto-Bold.ttf");
//Typeface txtOnlinePrice=Typeface.createFromAsset(FindMyBuffetApplicationCls.currentActivityContext.getAssets(),"Roboto-Bold.ttf");
Typeface btnPrice=Typeface.createFromAsset(FindMyBuffetApplication.currentActivityContext.getAssets(), "Roboto-Bold.ttf");
Typeface txtRestDistanceFontFace=Typeface.createFromAsset(FindMyBuffetApplication.currentActivityContext.getAssets(),"Roboto-Light.ttf");
// Locate the TextViews in listview_item.xml
holder.txtResName = (TextView) convertView.findViewById(R.id.txtRestName);
holder.txtResName.setTypeface(txtResnameFontFace);
holder.txtRestBufType = (TextView) convertView.findViewById(R.id.txtRestBufType);
holder.txtRestBufType.setTypeface(txtRestBufTypeFontFace);
holder.txtRestTime = (TextView) convertView.findViewById(R.id.txtRestTime);
holder.txtRestTime.setTypeface(txtRestTimeFontFace);
holder.txtRestDistance = (TextView) convertView.findViewById(R.id.txtRestDistance);
holder.txtRestDistance.setTypeface(txtRestDistanceFontFace);
holder.restRatingBar=(RatingBar) convertView.findViewById(R.id.restRatingBar);
//holder.txtReservePrice = (TextView) convertView.findViewById(R.id.txtReservePrice);
//holder.txtReservePrice.setTypeface(txtReservePrice);
//holder.txtOnlinePrice = (TextView) convertView.findViewById(R.id.txtOnlinePrice);
//holder.txtOnlinePrice.setTypeface(txtOnlinePrice);
holder.btnOnlinePrice=(Button) convertView.findViewById(R.id.btnOnlinePrice);
holder.btnOnlinePrice.setTypeface(btnPrice);
holder.btnReservedPrice=(Button) convertView.findViewById(R.id.btnReservedPrice);
holder.btnOnlinePrice.setTypeface(btnPrice);
// Locate the ImageView in listview_item.xml
holder.imgRestBuffLogo = (ImageView) convertView.findViewById(R.id.imgRestBuffetLogo);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
HashMap<String, String> objMap= arrayListBuffet.get(position);
holder.txtResName.setText(objMap.get(BuffetTable.COLUMN_RES_NAME));
holder.txtRestBufType.setText(objMap.get(BuffetTable.COLUMN_BUF_TYPE_NAME));
holder.restRatingBar.setRating(Float.valueOf(objMap.get(BuffetTable.COLUMN_RATING)));
holder.txtRestTime.setText(formatTime(objMap.get(BuffetTable.COLUMN_FROM_TIME))+" to "+formatTime(objMap.get(BuffetTable.COLUMN_TO_TIME)));
//txtOnlinePrice.setText(objMap.get("Online_Price"));
//txtReservePrice.setText(objMap.get("Reserved_Price"));
holder.btnOnlinePrice.setText(" Buy Now\n "+"Rs."+objMap.get(BuffetTable.COLUMN_ONLINE_PRICE)+" ");
holder.btnReservedPrice.setText(" Reserve\n "+"Rs."+objMap.get(BuffetTable.COLUMN_RESERVED_PRICE)+" ");
//double dist=objMap.get("Latitude")-objMap.get("Longitude");
//txtRestDistance.setText(String.valueOf(dist));
holder.txtRestDistance.setText(""+10+position+" Km");
String strUrl=FindMyBuffetApplication.URL+FindMyBuffetConstants.WEB_SERVER_PATH_BUF_IMAGE+objMap.get(BuffetTable.COLUMN_BUF_IMAGE_FILE_NAME);
imageLoader.DisplayImage(strUrl,holder.imgRestBuffLogo);
return convertView;
}
private String formatTime(String strTime){
//example For hour,minutes and seconds
// String strTime = "15:30:18 pm";
//SimpleDateFormat sdf = new SimpleDateFormat("hh:mm:ss a");
strTime=strTime.substring(0,5)+" am";
SimpleDateFormat sdf = new SimpleDateFormat("hh:mm a");
Date date = null;
try {
date = sdf.parse(strTime);
} catch (java.text.ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return sdf.format(date);
}
}
答案 0 :(得分：3)
private void sortListView( 中的
在调用notifyDataSetChanged之前，您应该将新数据集提交给适配器。否则，您只链接片段内的数据。你可以创建一个新的Adapter并再次调用setListAdapter，或者在Adapter中创建一个方法来更新数据集。例如：
public void updateData(ArrayList<HashMap<String, String>> _arraylist) {
this.arrayListBuffet = _arraylist;
}
并在
之前调用它listViewAdapter.notifyDataSetChanged();
答案 1 :(得分：0)
当您排序时，您实际上已添加到arrayListBuffet，但这可能不是您唯一的问题。您正在做的是对不在适配器内的数组进行排序，您需要将新排序的数据（在您的情况下arrayListBuffet）传递回适配器，然后再调用notifyDataSetChanged
为什么？因为如果不这样做，那么适配器使用的数据仍然是您初始化时的数据，因此您将看不到任何更改。换句话说，你并没有真正改变它正在使用的数据集。
如何？您可以在适配器中创建方法并将新排序的数据源作为参数传递，替换原始内容，您实际上可以从同一个内部调用notifyDataSetChanged方法
<强>代码 在适配器中：
public void updateDataSource(ArrayList<HashMap<String, String>> sortedArrayListBuffet) {
this.arrayListBuffet = sortedArrayListBuffet;
this.notifyDataSetChanged();
}