ListView items repetition

ListView items repetition - android

Now I have a list view with a custom adapter which shows a different layout types.
List view items are repeating in a random manner and I can't figure out the problem.
So, can anybody help please?
Here is my code.
public class NewsFeedAdapter extends BaseAdapter {
private final int IMAGE_COMPARISON = 0;
private final int POLL = 1;
private final int EMO = 2;
private final int TYPE_MAX_COUNT = EMO + 1;
private ArrayList<Post> posts = new ArrayList<Post>();
private ArrayList<Post> originalPosts = new ArrayList<Post>();
private MaterialDialog alert;
private Context context;
private ApiClient apiClient;
private SharedPreferences sharedPreferences;
private int id;
private Bitmap bitmap;
private ArrayList<View> views ;
private Intent sharingIntent;
private String link;
private String type;
public NewsFeedAdapter(Context context, ArrayList<Post> questionItems) {
this.context = context;
this.posts = questionItems;
this.originalPosts = new ArrayList<Post>(posts);
this.apiClient = ApiClient.getInstance(context);
sharedPreferences = context.getSharedPreferences(context.getResources().getStringArray(R.array.preferences)[4], 0);
views = new ArrayList<>();
}
#Override
public int getCount() {
return posts.size();
}
#Override
public Object getItem(int position) {
return posts.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public int getViewTypeCount() {
return TYPE_MAX_COUNT;
}
#Override
public int getItemViewType(int position) {
String type = ((Post)getItem(position)).getQ().getType();
if(type.equalsIgnoreCase("radio")){
return POLL;
}else if(type.equalsIgnoreCase("image")){
return IMAGE_COMPARISON;
}else{
return EMO;
}
}
public int getItemViewType(Post post) {
String type = (post).getQ().getType();
if(type.equalsIgnoreCase("radio")){
return POLL;
}else if(type.equalsIgnoreCase("image")){
return IMAGE_COMPARISON;
}else{
return EMO;
}
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
int type = getItemViewType(position);
switch (type) {
case IMAGE_COMPARISON:
ImageListRowView imageListRowView;
// if (convertView == null) {
imageListRowView = new ImageListRowView(context, new MenuListener() {
#Override
public void onReceive(MenuItemAction menuItemAction,int position) {
preformMenuAction(menuItemAction, position);
}
});
imageListRowView.setData(posts.get(position));
imageListRowView.setTag(R.string.view_tag,position);
views.add(imageListRowView);
return imageListRowView;
// }
// else
// imageListRowView = (ImageListRowView) convertView;
//return imageListRowView;
{
case EMO:
EmoListRowView emoListRowView;
// if (convertView == null) {
emoListRowView = new EmoListRowView(context, new MenuListener() {
#Override
public void onReceive(MenuItemAction menuItemAction,int position) {
preformMenuAction(menuItemAction, position);
}
});
emoListRowView.setData(posts.get(position));
emoListRowView.setTag(R.string.view_tag,position);
views.add(emoListRowView);
return emoListRowView;
// }
// else
// emoListRowView = (EmoListRowView) convertView;
// return emoListRowView;
case POLL:
PollListRowView pollListRowView;
// if (convertView == null) {
pollListRowView = new PollListRowView(context, new MenuListener() {
#Override
public void onReceive(MenuItemAction menuItemAction,int position) {
preformMenuAction(menuItemAction, position);
}
});
pollListRowView.setData(posts.get(position));
pollListRowView.setTag(R.string.view_tag,position);
views.add(pollListRowView);
return pollListRowView;
}
// else
// pollListRowView = (PollListRowView) convertView;
// return pollListRowView;
}
return convertView;
}

getView() needs to always customize the rows. The only variance based upon whether convertView is null is whether you have to also inflate the rows.
In each of your case blocks, if convertView is not null, you just return convertView without modification.

give a look at the following question.I think your problem resembles this one.
After scrolling listview, listview items getting repeatedly in android

Related

Android ListView glitching back to top for a few seconds before it works properly

I am trying to make an application with a ListView that include a Country Flag and name. This is so that the user can click on them and be shown images of the country that they wouldve taken before. However for about 3 seconds when the listview loads if i try to scroll it will sort of glitch and send me back to top. This is the code..
public class CountriesListAdapter extends ArrayAdapter {
private int resource;
private LayoutInflater inflater;
private List<CountryModel> countryModels;
private WeakReference<TextView> selectedCountryIdtxt;
private boolean useFilter;
private WeakReference<ProgressBar> progressBarWeakReference;
public int getSelectedCountryId() {
return selectedCountryId;
}
public void setSelectedCountryId(int selectedCountryId) {
this.selectedCountryId = selectedCountryId;
}
private int selectedCountryId;
public CountriesListAdapter(#NonNull WeakReference<Context> context, int resourceId, WeakReference<TextView> textView, #NonNull List<CountryModel> countryModelList, boolean useFilter, WeakReference<ProgressBar> progressBarWeakReference){
super(context.get(), resourceId, countryModelList);
selectedCountryIdtxt = textView;
resource = resourceId; //the id of the template file
inflater = LayoutInflater.from(context.get());
this.countryModels = countryModelList;
selectedCountryId = -1;
this.useFilter = useFilter;
this.progressBarWeakReference = progressBarWeakReference;
}
public int getCount() {
if (countryModels != null)
return countryModels.size();
return 0;
}
public CountryModel getItem(int position) {
if (countryModels != null)
return countryModels.get(position);
return null;
}
public long getItemId(int position) {
if (countryModels != null)
return countryModels.get(position).hashCode();
return 0;
}
#NonNull
#Override
public View getView(int position, #Nullable View convertView, #NonNull ViewGroup parent) {
// this method is automatically called for every object in our list
//basically it's called for every single row before it is generated
// this method is called per row
convertView = (ConstraintLayout) inflater.inflate(resource, null);
//the variable countryModel is fiiled with current object that is being processed
final CountryModel countryModel = countryModels.get(position);
TextView countryName = convertView.findViewById(R.id.countryNamelbl);
final ImageView countryFlag = convertView.findViewById(R.id.countryFlagimg);
final ImageView checked = convertView.findViewById(R.id.countryCheckedimg);
//this is done for every object in the list
assert countryModel != null;
countryName.setText(countryModel.getName());
Picasso.get().load(countryModel.getImage()).fit().into(countryFlag);
if(!useFilter) {
if (selectedCountryId == countryModel.getId()) {
checked.setVisibility(View.VISIBLE);
} else {
checked.setVisibility(View.INVISIBLE);
}
}
convertView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if(!useFilter) {
if (checked.getVisibility() == View.VISIBLE) {
checked.setVisibility(View.INVISIBLE);
selectedCountryId = -1;
selectedCountryIdtxt.get().setText(String.valueOf(selectedCountryId));
} else {
if (selectedCountryId == -1) {
checked.setVisibility(View.VISIBLE);
selectedCountryId = countryModel.getId();
} else {
selectedCountryId = countryModel.getId();
notifyDataSetChanged();
}
selectedCountryIdtxt.get().setText(String.valueOf(selectedCountryId));
}
} else {
Intent i = new Intent(getContext(), PicturesActivity.class);
i.putExtra("countryId",countryModel.getId());
i.putExtra("countryName", countryModel.getName());
getContext().startActivity(i);
}
}
});
progressBarWeakReference.get().setVisibility(View.INVISIBLE);
return convertView;
}
public List<CountryModel> getCountryModels() {
return countryModels;
}
public void setCountryModels(List<CountryModel> countryModels) {
this.countryModels = countryModels;
}
}

The problem was actually in another class, i was calling the adapter for every list item instead of just once... oops.
Thanks for the replies though!

ListView with different layouts with two different objects

I want to populate a ListView with different layouts for odd and even rows. It should look like this:
I use two objects "OddListItem" and "EvenListItem" to store/access the data. I do not know how to pass both objects to my custom listview adapter and get the correct view.
My object classes:
public class OddListItem {
private String time_start;
private String time_end;
private String location;
public OddListItem(String time_start, String time_end, String location) {
super();
this.time_start = time_start;
this.time_end = time_end;
this.location = location;
}
// getters and setters
void setTimeStart(String time_start) {
this.time_start = time_start;
}
void setTimeEnd(String time_end) {
this.time_end = time_end;
}
void setLocation(String location) {
this.location = location;
}
public String getTimeStart() {
return time_start;
}
public String getTimeEnd() {
return time_end;
}
public String getLocation() {
return location;
}
}
public class EvenListItem {
private String image;
private String location;
public EvenListItem (String image, String location) {
super();
this.image = image;
this.location = location;
}
// getters and setters
void setImage(String image) {
this.image = image;
}
void setLocation(String location) {
this.location = location;
}
public String getImage() {
return image;
}
public String getLocation() {
return location;
}
}
MyCustomAdapter:
public class MyCustomAdapter extends BaseAdapter {
// Tag for Logging
private static final String TAG = "MyCustomAdapter";
int type;
private static final int TYPE_ITEM = 0;
private static final int TYPE_SEPARATOR = 1;
private static final int TYPE_MAX_COUNT = TYPE_SEPARATOR + 1;
private ArrayList<OddListItem> mData = new ArrayList<OddListItem>();
private LayoutInflater mInflater;
//private TreeSet mSeparatorsSet = new TreeSet();
private Context context;
public MyCustomAdapter(Context context) {
mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
this.context = context;
}
public void addItem(final OddListItem item) {
mData.add(item);
//The notification is not necessary since the items are not added dynamically
//notifyDataSetChanged();
}
public void addSeparatorItem(final OddListItem item) {
mData.add(item);
//The notification is not necessary since the items are not added dynamically
//notifyDataSetChanged();
}
#Override
public int getItemViewType(int position) {
/*if ((position%2) == 0){
type = TYPE_ITEM;
} else {
type = TYPE_SEPARATOR;
}
return type;*/
return position%2;
}
#Override
public int getViewTypeCount() {
return TYPE_MAX_COUNT;
}
#Override
public int getCount() {
return mData.size();
}
#Override
public OddListItem getItem(int position) {
return mData.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
int type = getItemViewType(position);
Log.d(TAG, "getView " + position + " " + convertView + " type = " + type);
if (convertView == null) {
holder = new ViewHolder();
switch (type) {
case TYPE_ITEM:
//inflate the new layout
convertView = mInflater.inflate(R.layout.detail_list_row_odd, parent, false);
holder.tv_time_from = (TextView) convertView.findViewById(R.id.tv_time_from);
holder.tv_time_to = (TextView) convertView.findViewById(R.id.tv_time_to);
holder.tv_current_location_odd = (TextView) convertView.findViewById(R.id.tv_current_location_odd);
//fill the layout with values
/*holder.tv_time_from.setText("12:34");
holder.tv_time_to.setText("12:37");
holder.tv_current_location_odd.setText("Aktueller Standort");*/
holder.tv_time_from.setText(mData.get(position).getTimeStart());
holder.tv_time_to.setText(mData.get(position).getTimeEnd());
holder.tv_current_location_odd.setText(mData.get(position).getLocation());
break;
case TYPE_SEPARATOR:
//inflate the new layout
convertView = mInflater.inflate(R.layout.detail_list_row_even, parent, false);
holder.tv_current_location_even = (TextView) convertView.findViewById(R.id.tv_current_location_even);
holder.img_transport = (ImageView) convertView.findViewById(R.id.img_transport);
//fill the layout with values
holder.tv_current_location_even.setText("Hauptbahnhof");
holder.img_transport.setImageDrawable(context.getResources().getDrawable(R.drawable.rollator));
break;
default:
break;
}
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
return convertView;
}
private static class ViewHolder {
public TextView tv_time_from;
public TextView tv_time_to;
public TextView tv_current_location_odd;
public TextView tv_current_location_even;
public ImageView img_transport;
}
}
Here I generate the data and call the adapter:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detailed_connection);
generateData();
//fill ListView with custom content from MyCustomAdapter class
mAdapter = new MyCustomAdapter(getApplicationContext());
for (int i = 1; i < odd_items.size(); i++) {
mAdapter.addItem(odd_items.get(i));
if (i % 1 == 0) {
mAdapter.addSeparatorItem(odd_items.get(i));
}
}
setListAdapter(mAdapter);
//set duration text
tv_duration = (TextView)findViewById(R.id.tv_duration);
tv_duration.setText("Dauer: 22 Minuten");
}
private void generateData() {
odd_items = new ArrayList<OddListItem>();
odd_items.add(new OddListItem("12:34", "", "Aktueller Standort"));
odd_items.add(new OddListItem("12:37", "12:37", "TUM"));
odd_items.add(new OddListItem("12:42", "12:42", "Hauptbahnhof Nord"));
odd_items.add(new OddListItem("12:48", "12:48", "Hauptbahnhof"));
even_items = new ArrayList<EvenListItem>();
even_items.add(new EvenListItem("R.drawable.rollator", "3 Minuten Fußweg"));
even_items.add(new EvenListItem("R.drawable.bus", "Richtung Hauptbahnhof Nord"));
even_items.add(new EvenListItem("R.drawable.rollator", "6 Minuten Fußweg"));
mData = new Data(odd_items, even_items);
}
Any help would be great. Maybe there is also a better approach then please let me know.

I would create a Single list of Items
public class Items {
private String time_start;
private String time_end;
private String location;
private int image;
private String locationeven;
private int oddoreven;
public String getTime_start() {
return time_start;
}
public void setTime_start(String time_start) {
this.time_start = time_start;
}
public String getTime_end() {
return time_end;
}
public void setTime_end(String time_end) {
this.time_end = time_end;
}
public String getLocation() {
return location;
}
public void setLocation(String location) {
this.location = location;
}
public int getImage() {
return image;
}
public void setImage(int image) {
this.image = image;
}
public String getLocationeven() {
return locationeven;
}
public void setLocationeven(String locationeven) {
this.locationeven = locationeven;
}
public int getOddoreven() {
return oddoreven;
}
public void setOddoreven(int oddoreven) {
this.oddoreven = oddoreven;
}
}
In onCreate of Activity call
generateData() ;
Then
ArrayList<Items> oddorevenlist = new ArrayList<Items>();
private void generateData() {
Items item1 = new Items();
item1.setTime_start("12:34");
item1.setTime_end("");
item1.setLocation("Aktueller Standort");
item1.setOddoreven(0);
oddorevenlist.add(item1);
Items item2 = new Items();
item2.setImage(R.drawable.ic_launcher);
item2.setLocationeven("3 Minuten Fußweg");
item2.setOddoreven(1);
oddorevenlist.add(item2);
Items item3 = new Items();
item3.setTime_start("12:37");
item3.setTime_end("12:37");
item3.setLocation("Tum");
item3.setOddoreven(0);
oddorevenlist.add(item3);
Items item4 = new Items();
item4.setImage(R.drawable.ic_launcher);
item4.setLocationeven("Richtung Hauptbahnhof Nord");
item4.setOddoreven(1);
oddorevenlist.add(item4);
Items item5 = new Items();
item5.setTime_start("12:42");
item5.setTime_end("12:42");
item5.setLocation("Hauptbahnhof Nord");
item5.setOddoreven(0);
oddorevenlist.add(item5);
Items item6 = new Items();
item6.setImage(R.drawable.ic_launcher);
item6.setLocationeven("R6 Minuten Fußweg");
item6.setOddoreven(1);
oddorevenlist.add(item6);
Items item7 = new Items();
item7.setTime_start("12:48");
item7.setTime_end("12:48");
item7.setLocation("HHauptbahnhof");
item7.setOddoreven(0);
oddorevenlist.add(item7);
MyCustomAdapter mAdapter = new MyCustomAdapter(this,oddorevenlist);
setListAdapter(mAdapter);
}
Adapter code
public class MyCustomAdapter extends BaseAdapter {
// Tag for Logging
private static final String TAG = "MyCustomAdapter";
int type;
private static final int TYPE_ITEM = 0;
private static final int TYPE_SEPARATOR = 1;
private ArrayList<Items> oddorevenlist ;
private LayoutInflater mInflater;
private Context context;
public MyCustomAdapter(Context context, ArrayList<Items> oddorevenlist) {
mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
this.context = context;
this.oddorevenlist = oddorevenlist;
}
#Override
public int getItemViewType(int position) {
if (oddorevenlist.get(position).getOddoreven()==0){
type = TYPE_ITEM;
} else if (oddorevenlist.get(position).getOddoreven()==1) {
type = TYPE_SEPARATOR;
}
return type;
}
#Override
public int getViewTypeCount() {
return 2;
}
#Override
public int getCount() {
return oddorevenlist.size();
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
int type = getItemViewType(position);
Log.d(TAG, "getView " + position + " " + convertView + " type = " + type);
if (convertView == null) {
holder = new ViewHolder();
switch (type) {
case TYPE_ITEM:
//inflate the new layout
convertView = mInflater.inflate(R.layout.row_odd, parent, false);
holder.tv_time_from = (TextView) convertView.findViewById(R.id.tv_time_from);
holder.tv_time_to = (TextView) convertView.findViewById(R.id.tv_time_to);
holder.tv_current_location_odd = (TextView) convertView.findViewById(R.id.tv_current_location_odd);
holder.tv_time_from.setText(oddorevenlist.get(position).getTime_start());
holder.tv_time_to.setText(oddorevenlist.get(position).getTime_end());
holder.tv_current_location_odd.setText(oddorevenlist.get(position).getLocation());
break;
case TYPE_SEPARATOR:
//inflate the new layout
convertView = mInflater.inflate(R.layout.row_even, parent, false);
holder.tv_current_location_even = (TextView) convertView.findViewById(R.id.tv_current_location_even);
holder.img_transport = (ImageView) convertView.findViewById(R.id.img_transport);
//fill the layout with values
holder.tv_current_location_even.setText(oddorevenlist.get(position).getLocationeven());
holder.img_transport.setImageResource(R.drawable.ic_launcher);
break;
default:
break;
}
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
return convertView;
}
private static class ViewHolder {
public TextView tv_time_from;
public TextView tv_time_to;
public TextView tv_current_location_odd;
public TextView tv_current_location_even;
public ImageView img_transport;
}
#Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
}
Snap

How to apply filter to customlistview

I am using Custom adapter for my listview and I want to apply filter for searching perticular item from the list how to do that? I Know that how to do that for adapter extending ArrayAdapter but in my case it is simplesectionadapter.I have one editText above the listview from the text entered in the edittext I want to serch the Item.
Collections.sort(contents, new Comparator<CategoryPojo>() {
#Override
public int compare(CategoryPojo s1, CategoryPojo s2) {
return s1.getCategoryName().compareToIgnoreCase(
s2.getCategoryName());
}
});
final CategoryAdapter adapter = new CategoryAdapter(this,
android.R.layout.simple_list_item_1, contents);
Sectionizer<CategoryPojo> alphabetSectionizer = new Sectionizer<CategoryPojo>() {
#Override
public String getSectionTitleForItem(CategoryPojo instance) {
return instance.getCategoryName().substring(0, 1);
}
};
final SimpleSectionAdapter<CategoryPojo> sectionAdapter = new SimpleSectionAdapter<CategoryPojo>(
this, adapter, R.layout.section_header, R.id.title,
alphabetSectionizer);
listView.setFastScrollEnabled(true);
listView.setTextFilterEnabled(true);
listView.setAdapter(sectionAdapter);
and this is simplesectionadapter
public class SimpleSectionAdapter<T> extends BaseAdapter implements Filterable{
static final boolean DEBUG = false;
static final String TAG = SimpleSectionAdapter.class.getSimpleName();
// Constants
private static final int VIEW_TYPE_SECTION_HEADER = 0;
// Attributes
private Context mContext;
private BaseAdapter mListAdapter;
private int mSectionHeaderLayoutId;
private int mSectionTitleTextViewId;
private Sectionizer<T> mSectionizer;
private LinkedHashMap<String, Integer> mSections;
AlphabetIndexer alphaIndexer;
private Filter filter;
/**
* Constructs a {#linkplain SimpleSectionAdapter}.
*
* #param context The context for this adapter.
* #param listAdapter A {#link ListAdapter} that has to be sectioned.
* #param sectionHeaderLayoutId Layout Id of the layout that is to be used for the header.
* #param sectionTitleTextViewId Id of a TextView present in the section header layout.
* #param sectionizer Sectionizer for sectioning the {#link ListView}.
*/
public SimpleSectionAdapter(Context context, BaseAdapter listAdapter,
int sectionHeaderLayoutId, int sectionTitleTextViewId,
Sectionizer<T> sectionizer) {
if(context == null) {
throw new IllegalArgumentException("context cannot be null.");
} else if(listAdapter == null) {
throw new IllegalArgumentException("listAdapter cannot be null.");
} else if(sectionizer == null) {
throw new IllegalArgumentException("sectionizer cannot be null.");
} else if(!isTextView(context, sectionHeaderLayoutId, sectionTitleTextViewId)) {
throw new IllegalArgumentException("sectionTitleTextViewId should be a TextView.");
}
this.mContext = context;
this.mListAdapter = listAdapter;
this.mSectionHeaderLayoutId = sectionHeaderLayoutId;
this.mSectionTitleTextViewId = sectionTitleTextViewId;
this.mSectionizer = sectionizer;
this.mSections = new LinkedHashMap<String, Integer>();
// Find sections
findSections();
}
private boolean isTextView(Context context, int layoutId, int textViewId) {
View inflatedView = View.inflate(context, layoutId, null);
View foundView = inflatedView.findViewById(textViewId);
return foundView instanceof TextView;
}
#Override
public int getCount() {
return mListAdapter.getCount() + getSectionCount();
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = convertView;
SectionHolder sectionHolder = null;
switch (getItemViewType(position)) {
case VIEW_TYPE_SECTION_HEADER:
if(view == null) {
view = View.inflate(mContext, mSectionHeaderLayoutId, null);
sectionHolder = new SectionHolder();
sectionHolder.titleTextView = (TextView) view.findViewById(mSectionTitleTextViewId);
view.setTag(sectionHolder);
} else {
sectionHolder = (SectionHolder) view.getTag();
}
break;
default:
view = mListAdapter.getView(getIndexForPosition(position),
convertView, parent);
break;
}
if(sectionHolder != null) {
String sectionName = sectionTitleForPosition(position);
sectionHolder.titleTextView.setText(sectionName);
}
return view;
}
#Override
public boolean areAllItemsEnabled() {
return mListAdapter.areAllItemsEnabled() ?
mSections.size() == 0 : false;
}
#Override
public int getItemViewType(int position) {
int positionInCustomAdapter = getIndexForPosition(position);
return mSections.values().contains(position) ?
VIEW_TYPE_SECTION_HEADER :
mListAdapter.getItemViewType(positionInCustomAdapter) + 1;
}
#Override
public int getViewTypeCount() {
return mListAdapter.getViewTypeCount() + 1;
}
#Override
public boolean isEnabled(int position) {
return mSections.values().contains(position) ?
false : mListAdapter.isEnabled(getIndexForPosition(position));
}
#Override
public Object getItem(int position) {
return mListAdapter.getItem(getIndexForPosition(position));
}
#Override
public long getItemId(int position) {
return mListAdapter.getItemId(getIndexForPosition(position));
}
#Override
public void notifyDataSetChanged() {
mListAdapter.notifyDataSetChanged();
findSections();
super.notifyDataSetChanged();
}
/**
* Returns the actual index of the object in the data source linked to the this list item.
*
* #param position List item position in the {#link ListView}.
* #return Index of the item in the wrapped list adapter's data source.
*/
public int getIndexForPosition(int position) {
int nSections = 0;
Set<Entry<String, Integer>> entrySet = mSections.entrySet();
for(Entry<String, Integer> entry : entrySet) {
if(entry.getValue() < position) {
nSections++;
}
}
return position - nSections;
}
static class SectionHolder {
public TextView titleTextView;
}
private void findSections() {
int n = mListAdapter.getCount();
int nSections = 0;
mSections.clear();
for(int i=0; i<n; i++) {
String sectionName = mSectionizer.getSectionTitleForItem((T) mListAdapter.getItem(i));
if(!mSections.containsKey(sectionName)) {
mSections.put(sectionName, i + nSections);
nSections ++;
}
}
if(DEBUG) {
Log.d(TAG, String.format("Found %d sections.", mSections.size()));
}
}
private int getSectionCount() {
return mSections.size();
}
private String sectionTitleForPosition(int position) {
String title = null;
Set<Entry<String, Integer>> entrySet = mSections.entrySet();
for(Entry<String, Integer> entry : entrySet) {
if(entry.getValue() == position) {
title = entry.getKey();
break;
}
}
return title;
}

You can use addTextChangedListener & in onTextChanged method get your search string & match this string with your listItems & prepare new list of searched items.Then reinitialize your adapter & set it to ListView.

hide section labels in listview

I use component android-section-list (http://code.google.com/p/android-section-list/) to create sections in my listView. How can I hide sections after push some button?
I try to do like
public void onClick(View v) {
switch(v.getId()) {
case R.id.sortTitle:
LayoutInflater inflater = (LayoutInflater) this.getSystemService(
Context.LAYOUT_INFLATER_SERVICE);
View convertView = inflater.inflate(R.layout.market_list_separator, null, false);
TextView separatorLayout = (TextView) convertView.findViewById(R.id.section_view);
separatorLayout.setVisibility(View.GONE);
sectionAdapter.notifyDataSetChanged();
setButtonState(sortByTitle);
adapter.sort((Comparator<SectionListItem>) sortByTitle());
break;
}
}
But this way don't work.
My adapter put data in list rows and SectionListAdapter draw sections.
public class SectionListAdapter extends BaseAdapter implements ListAdapter,
OnItemClickListener {
private final DataSetObserver dataSetObserver = new DataSetObserver() {
#Override
public void onChanged() {
super.onChanged();
updateSessionCache();
}
#Override
public void onInvalidated() {
super.onInvalidated();
updateSessionCache();
};
};
private final ListAdapter linkedAdapter;
private final Map<Integer, String> sectionPositions = new LinkedHashMap<Integer, String>();
private final Map<Integer, Integer> itemPositions = new LinkedHashMap<Integer, Integer>();
private final Map<View, String> currentViewSections = new HashMap<View, String>();
private int viewTypeCount;
protected final LayoutInflater inflater;
private View transparentSectionView;
private OnItemClickListener linkedListener;
public SectionListAdapter(final LayoutInflater inflater,
final ListAdapter linkedAdapter) {
this.linkedAdapter = linkedAdapter;
this.inflater = inflater;
linkedAdapter.registerDataSetObserver(dataSetObserver);
updateSessionCache();
}
private boolean isTheSame(final String previousSection,
final String newSection) {
if (previousSection == null) {
return newSection == null;
} else {
return previousSection.equals(newSection);
}
}
private synchronized void updateSessionCache() {
int currentPosition = 0;
sectionPositions.clear();
itemPositions.clear();
viewTypeCount = linkedAdapter.getViewTypeCount() + 1;
String currentSection = null;
final int count = linkedAdapter.getCount();
for (int i = 0; i < count; i++) {
final SectionListItem item = (SectionListItem) linkedAdapter
.getItem(i);
if (!isTheSame(currentSection, item.section)) {
sectionPositions.put(currentPosition, item.section);
currentSection = item.section;
currentPosition++;
}
itemPositions.put(currentPosition, i);
currentPosition++;
}
}
public synchronized int getCount() {
return sectionPositions.size() + itemPositions.size();
}
public synchronized Object getItem(final int position) {
if (isSection(position)) {
return sectionPositions.get(position);
} else {
final int linkedItemPosition = getLinkedPosition(position);
return linkedAdapter.getItem(linkedItemPosition);
}
}
public synchronized boolean isSection(final int position) {
return sectionPositions.containsKey(position);
}
public synchronized String getSectionName(final int position) {
if (isSection(position)) {
return sectionPositions.get(position);
} else {
return null;
}
}
public long getItemId(final int position) {
if (isSection(position)) {
return sectionPositions.get(position).hashCode();
} else {
return linkedAdapter.getItemId(getLinkedPosition(position));
}
}
protected Integer getLinkedPosition(final int position) {
return itemPositions.get(position);
}
#Override
public int getItemViewType(final int position) {
if (isSection(position)) {
return viewTypeCount - 1;
}
return linkedAdapter.getItemViewType(getLinkedPosition(position));
}
private View getSectionView(final View convertView, final String section) {
View theView = convertView;
if (theView == null) {
theView = createNewSectionView();
}
setSectionText(section, theView);
replaceSectionViewsInMaps(section, theView);
return theView;
}
protected void setSectionText(final String section, final View sectionView) {
final TextView textView = (TextView) sectionView.findViewById(R.id.listTextView);
textView.setText(section);
}
protected synchronized void replaceSectionViewsInMaps(final String section,
final View theView) {
if (currentViewSections.containsKey(theView)) {
currentViewSections.remove(theView);
}
currentViewSections.put(theView, section);
}
protected View createNewSectionView() {
return inflater.inflate(R.layout.section_view, null);
}
public View getView(final int position, final View convertView,
final ViewGroup parent) {
if (isSection(position)) {
return getSectionView(convertView, sectionPositions.get(position));
}
return linkedAdapter.getView(getLinkedPosition(position), convertView,
parent);
}
#Override
public int getViewTypeCount() {
return viewTypeCount;
}
#Override
public boolean hasStableIds() {
return linkedAdapter.hasStableIds();
}
#Override
public boolean isEmpty() {
return linkedAdapter.isEmpty();
}
#Override
public void registerDataSetObserver(final DataSetObserver observer) {
linkedAdapter.registerDataSetObserver(observer);
}
#Override
public void unregisterDataSetObserver(final DataSetObserver observer) {
linkedAdapter.unregisterDataSetObserver(observer);
}
#Override
public boolean areAllItemsEnabled() {
return linkedAdapter.areAllItemsEnabled();
}
#Override
public boolean isEnabled(final int position) {
if (isSection(position)) {
return true;
}
return linkedAdapter.isEnabled(getLinkedPosition(position));
}
public void makeSectionInvisibleIfFirstInList(final int firstVisibleItem) {
final String section = getSectionName(firstVisibleItem);
// only make invisible the first section with that name in case there
// are more with the same name
boolean alreadySetFirstSectionIvisible = false;
for (final Entry<View, String> itemView : currentViewSections
.entrySet()) {
if (itemView.getValue().equals(section)
&& !alreadySetFirstSectionIvisible) {
itemView.getKey().setVisibility(View.INVISIBLE);
alreadySetFirstSectionIvisible = true;
} else {
itemView.getKey().setVisibility(View.VISIBLE);
}
}
for (final Entry<Integer, String> entry : sectionPositions.entrySet()) {
if (entry.getKey() > firstVisibleItem + 1) {
break;
}
setSectionText(entry.getValue(), getTransparentSectionView());
}
}
public synchronized View getTransparentSectionView() {
if (transparentSectionView == null) {
transparentSectionView = createNewSectionView();
}
return transparentSectionView;
}
protected void sectionClicked(final String section) {
//
}
public void onItemClick(final AdapterView< ? > parent, final View view,
final int position, final long id) {
if (isSection(position)) {
sectionClicked(getSectionName(position));
} else if (linkedListener != null) {
linkedListener.onItemClick(parent, view,
getLinkedPosition(position), id);
}
}
public void setOnItemClickListener(final OnItemClickListener linkedListener) {
this.linkedListener = linkedListener;
}
}
Where can I put check for visibility in this Adapter?

This works but will be overwritten by the getView() method in the adapter . You must handle this in the adapter bcoz each time view becomes visible on the screen the View is updated so becomes visible in your case.
For the Data you are storing add a Visibility field ( by default keep it visible ) and change the Visibility to GONE in the onClick() method.
if you dont understand , post me your code and will let you know what changes to make.

ListView does not render all items until interacted with

I have a very strange problem while using my ListView.
Only a part of my adapter items are renderd in the listview on screen but when I interact with the listview (ie tries to scroll it) all items are renderd properly.
This fenonemon only occurs if i have less items than the screen can show. Take a look at these screenshots below.
Before interaction:
After interaction:
Source code of activity where adding items:
String[] jRests = getResources().getStringArray(R.array.j_restaurants);
String[] lRests = getResources().getStringArray(R.array.l_restaurants);
items = new ArrayList<Object>();
items.add(getString(R.string.campus_j));
for(String item : jRests){
String[] val = item.split(",,,");
items.add(new FoodSectionListItem(new Restaurant(val[0], val[1], val[2], "")));
}
items.add(getString(R.string.campus_l));
for(String item : lRests){
String[] val = item.split(",,,");
items.add(new FoodSectionListItem(new Restaurant(val[0], val[1], val[2], "")));
}
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
adapter = new BaseSectionAdapter(this, R.layout.list_item_fragment_header);
if(!isTabletView()){
adapter.setSelectedItem(-1);
}
adapter.setItems(items);
Code of adapter:
public class BaseSectionAdapter extends AmazingAdapter {
private LayoutInflater inflater;
private int selectedItem = 0;
private List<Object> items;
private List<SectionItem> sections = new ArrayList<SectionItem>(10);
private List<Class> itemTypes = new ArrayList<Class>();
private List<Integer> sectionPositions = new ArrayList<Integer>();
private int listHeaderLayoutId;
private View headerView;
public static interface ISectionListItem {
public void setProps(View convertView, int position, int selectedItem);
public View getLayout(LayoutInflater inflater);
}
private class SectionItem implements Serializable {
private static final long serialVersionUID = -8930010937740160935L;
String text;
int position;
public SectionItem(String text, int position) {
this.text = text;
this.position = position;
}
}
public BaseSectionAdapter(Context context, int listHeaderLayoutId) {
this.listHeaderLayoutId = listHeaderLayoutId;
init(context);
}
public BaseSectionAdapter(Context context, int listHeaderLayoutId, List<Object> listItems) {
this.listHeaderLayoutId = listHeaderLayoutId;
init(context);
initListItems(listItems);
}
private void init(Context context) {
inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public void setSelectedItem(int position) {
selectedItem = position;
}
// public List<ListItem> getItems() {
// return items;
// }
private void initListItems(List<Object> itemList) {
int curSection = -1;
//int curPosition = 0;
//curSection = 0;
this.items = itemList;
itemTypes.clear();
sections.clear();
sectionPositions.clear();
int listSize = itemList.size();
for(int i = 0; i < listSize; i++){
Object currentItem = items.get(i);
if(currentItem instanceof String){
sections.add(new SectionItem((String) currentItem,i));
curSection++;
}
if(!itemTypes.contains(currentItem.getClass())){
itemTypes.add(currentItem.getClass());
}
sectionPositions.add(curSection);
}
Log.d("test", "No of items = "+items.size());
Log.d("test", "No of itemtypes = "+itemTypes.size());
Log.d("test", "View type count = "+getViewTypeCount());
}
public void setItems(List<Object> itemList) {
initListItems(itemList);
}
public int getCount() {
return items==null?0:items.size();
}
#Override
public int getViewTypeCount(){
return (itemTypes.size() == 0)?1:itemTypes.size();
}
#Override
public int getItemViewType(int position){
return itemTypes.indexOf(items.get(position).getClass());
}
#Override
public boolean isEnabled(int position){
return !(items.get(position) instanceof String || items.get(position) instanceof EmptySectionListItem);
}
#Override
public Object getItem(int position) {
return items.get(position);
}
public long getItemId(int position) {
return position;
}
#Override
protected void onNextPageRequested(int page) {
// TODO Auto-generated method stub
}
#Override
protected void bindSectionHeader(View view, int position,
boolean displaySectionHeader) {
// TextView lSectionTitle = (TextView) view
// .findViewById(R.id.txt_list_header);
// if (displaySectionHeader) {
// lSectionTitle.setVisibility(View.VISIBLE);
// lSectionTitle
// .setText(getSections()[getSectionForPosition(position)]);
// } else {
// lSectionTitle.setVisibility(View.GONE);
// }
}
#Override
public View getAmazingView(int position, View convertView, ViewGroup parent) {
Object curItemObject = items.get(position);
boolean isHeader = (curItemObject instanceof String);
if(convertView == null){
if(isHeader && headerView != null){
convertView = headerView;
}else if(isHeader){
convertView = inflater.inflate(listHeaderLayoutId, null);
headerView = convertView;
}else{
convertView = ((ISectionListItem) curItemObject).getLayout(inflater);
}
}
if(isHeader){
TextView header = ((TextView)convertView.findViewById(R.id.txt_list_header));
header.setText((String)curItemObject);
}else{
((ISectionListItem)curItemObject).setProps(convertView, position, selectedItem);
}
return convertView;
}
#Override
public void configurePinnedHeader(View header, int position, int alpha) {
TextView textView = ((TextView)header.findViewById(R.id.txt_list_header));
textView.setText(getSections()[getSectionForPosition(position)]);
}
#Override
public int getPositionForSection(int section) {
if(section >= sections.size()){
return 0;
}
return sections.get(section).position;
}
#Override
public int getSectionForPosition(int position) {
return sectionPositions.get(position);
}
#Override
public String[] getSections() {
String[] res = new String[sections.size()];
for (int i = 0; i < res.length; i++) {
res[i] = sections.get(i).text;
}
return res;
}
}
Code of layout:
LinearLayout layout = new LinearLayout(this);
layout.setOrientation(LinearLayout.HORIZONTAL);
FrameLayout listLayout = new FrameLayout(this);
LinearLayout.LayoutParams listParams = new LinearLayout.LayoutParams(0, FrameLayout.LayoutParams.MATCH_PARENT);
listParams.weight = 1;
listLayout.setId(LIST_FRAGMENT_VIEW_ID);
FrameLayout detailLayout = new FrameLayout(this);
LinearLayout.LayoutParams detailParams = new LinearLayout.LayoutParams(0, FrameLayout.LayoutParams.MATCH_PARENT);
detailParams.weight = 2;
detailLayout.setId(DETAIL_FRAGMENT_VIEW_ID);
layout.addView(listLayout, listParams);
layout.addView(detailLayout, detailParams);
if(savedInstanceState == null){
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.add(listLayout.getId(), (Fragment) listFragment, TWO_PANEL_LIST_FRAGMENT_TAG);
ft.add(detailLayout.getId(), detailFragment);
ft.commit();
}
setContentView(layout);

try calling notifyDataSetChanged() in runOnUIThread() method like I have shown below and it will work like a charm. :)
runOnUiThread(new Runnable() {
#Override
public void run() {
messageAdapter.notifyDataSetChanged();
}
});

i dont know what causes the problem, but if you don't find a logical solution to it you could try something like this:
trigger an onTouchEvent() programmatically whenever you launch the ListView.
scroll down and back up programmatically as soon as the ListView is launched.
etc..

Add ListView widget to layout.xml and add content of list to that. Do not use FrameLayout as it probably is the cause of the problem. It is updating content after touch so the Layout it is on is no implementing the correct onCreate() setup as the ListView widget has.

Are you calling the method notifyDataSetChanged() on your adapter after adding new items? This causes the listview to refresh its view when the underlying dataset is changed.
If it still doesn't work, try notifyDataSetInvalidated() that causes the listview to redraw completely.

Solved it!!!
Problem was with the adapter trying to reuse the same section item. Not good!!!
Changed it to inflate the section item each time we hit a section!

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

ListView items repetition - android

getView() needs to always customize the rows. The only variance based upon whether convertView is null is whether you have to also inflate the rows. In each of your case blocks, if convertView is not null, you just return convertView without modification.

give a look at the following question.I think your problem resembles this one. After scrolling listview, listview items getting repeatedly in android

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Android ListView glitching back to top for a few seconds before it works properly

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How to apply filter to customlistview

hide section labels in listview

ListView does not render all items until interacted with

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