如何將過濾器應用到自定義列表視圖

Question

我使用自定義適配器爲我的列表視圖，我想應用過濾器從列表中搜索perticular項目如何做到這一點？我知道如何做到這一點適配器擴展ArrayAdapter，但在我的情況下，它是simplesectionadapter.I有一個EditText上方的edittext文本中輸入edittext我想要serch該項目。

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); 

，這是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; 
    } 

Answer 1

您可以使用addTextChangedListener &在onTextChanged方法讓您的搜索字符串匹配&此字符串與listItems中&準備新的列表找遍items.Then重新初始化適配器&將其設置爲ListView。