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POHow to apply filter to customlistview
 

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  1. POHow to apply filter to customlistview
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    <p>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.</p> <pre><code>Collections.sort(contents, new Comparator&lt;CategoryPojo&gt;() { @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&lt;CategoryPojo&gt; alphabetSectionizer = new Sectionizer&lt;CategoryPojo&gt;() { @Override public String getSectionTitleForItem(CategoryPojo instance) { return instance.getCategoryName().substring(0, 1); } }; final SimpleSectionAdapter&lt;CategoryPojo&gt; sectionAdapter = new SimpleSectionAdapter&lt;CategoryPojo&gt;( this, adapter, R.layout.section_header, R.id.title, alphabetSectionizer); listView.setFastScrollEnabled(true); listView.setTextFilterEnabled(true); listView.setAdapter(sectionAdapter); </code></pre> <p>and this is simplesectionadapter</p> <pre><code>public class SimpleSectionAdapter&lt;T&gt; 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&lt;T&gt; mSectionizer; private LinkedHashMap&lt;String, Integer&gt; 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&lt;T&gt; 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&lt;String, Integer&gt;(); // 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&lt;Entry&lt;String, Integer&gt;&gt; entrySet = mSections.entrySet(); for(Entry&lt;String, Integer&gt; entry : entrySet) { if(entry.getValue() &lt; 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&lt;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&lt;Entry&lt;String, Integer&gt;&gt; entrySet = mSections.entrySet(); for(Entry&lt;String, Integer&gt; entry : entrySet) { if(entry.getValue() == position) { title = entry.getKey(); break; } } return title; } </code></pre>
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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