I'm trying to set up a 2-line list view but each string seems to copy itself within the item rather than showing it once. How can I prevent this from happening? i.e. I need the data to appear like this: for Item 1 - America, America Description rather than America, America; for Item 2 - Europe, Europe Description rather than Europe, Europe. See screenshot for evidence of the undesired result.
ListData.java
public class ListData {
public static final int[][] items = {
{R.string.america,R.string.america_description},
{R.string.europe, R.string.europe_description}
};
}
ListViewAdapter
public class ItemListAdapter extends BaseAdapter implements Filterable {
private List<String> mData;
private List<String> mFilteredData;
private LayoutInflater mInflater;
private ItemFilter mFilter;
public ItemListAdapter (List<String> data, Context context) {
mData = data;
mFilteredData = data;
mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
return mFilteredData.size();
}
@Override
public String getItem(int position) {
return mFilteredData.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
String strItem = mFilteredData.get(position);
ViewHolder holder;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.item_row, parent, false);
holder = new ViewHolder();
holder.mTitle = (TextView) convertView.findViewById(R.id.item_title);
holder.mDescription = (TextView) convertView.findViewById(R.id.item_description);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.mTitle.setText(strItem);
holder.mDescription.setText(strItem);
return convertView;
}
@Override
public Filter getFilter() {
if (mFilter == null) {
mFilter = new ItemFilter();
}
return mFilter;
}
/**
* View holder
*/
static class ViewHolder {
private TextView mTitle;
private TextView mDescription;
}
}
item_row.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:minHeight="?android:attr/listPreferredItemHeight"
android:paddingRight="?android:attr/scrollbarSize"
android:baselineAligned="false">
<RelativeLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1">
<TextView android:id="@+id/item_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:ellipsize="marquee"
android:textColor="?android:attr/textColorPrimary" />
<TextView android:id="@+id/item_description"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/item_title"
android:layout_alignLeft="@id/item_title"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="?android:attr/textColorSecondary" />
</RelativeLayout>
</LinearLayout>
ItemListadapter.java
public class ItemListAdapter extends BaseAdapter implements Filterable {
private List<String> mData;
private List<String> mFilteredData;
private LayoutInflater mInflater;
private ItemFilter mFilter;
public ItemListAdapter (List<String> data, Context context) {
mData = data;
mFilteredData = data;
mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
return mFilteredData.size();
}
@Override
public String getItem(int position) {
return mFilteredData.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
String strItem = mFilteredData.get(position);
ViewHolder holder;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.item_row, parent, false);
holder = new ViewHolder();
holder.mTitle = (TextView) convertView.findViewById(R.id.item_title);
holder.mDescription = (TextView) convertView.findViewById(R.id.item_description);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.mTitle.setText(strItem);
holder.mDescription.setText(strItem);
return convertView;
}
@Override
public Filter getFilter() {
if (mFilter == null) {
mFilter = new ItemFilter();
}
return mFilter;
}
/**
* View holder
*/
static class ViewHolder {
private TextView mTitle;
private TextView mDescription;
}
/**
* Filter for filtering list items
*/
private class ItemFilter extends Filter {
/**
* Invoked on a background thread. This is where all the filter logic should go
* @param constraint the constraint to filter on
* @return the resulting list after applying the constraint
*/
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults();
if (TextUtils.isEmpty(constraint)) {
results.count = mData.size();
results.values = mData;
} else {
//Create a new list to filter on
List<String> resultList = new ArrayList<>();
for (String str : mData) {
if (str.toLowerCase().contains(constraint.toString().toLowerCase())) {
resultList.add(str);
}
}
results.count = resultList.size();
results.values = resultList;
}
return results;
}
/**
* Runs on ui thread
* @param constraint the constraint used for the result
* @param results the results to display
*/
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
if (results.count == 0) {
notifyDataSetInvalidated();
} else {
mFilteredData = (ArrayList<String>)results.values;
notifyDataSetChanged();
}
}
}
}
The name is shown two times in
ListView
because you are passing in bothTextView
the same item:To avoid this and use two separate fields you need to pass to your adapter a model with two field:
Then you have to add them to create a
new List<CustomListItem>
in your activity/fragment that use the adapter and pass to the adapter this list: