在Android中的CustomArrayAdapter上過濾器

Question

我是Android新手，我跟着一些關於在ListView上添加搜索功能的教程，但在我的情況下它不工作。有人能告訴我我的代碼有什麼問題嗎？

這裏是我的代碼：

Activity.java

public class SendMoney extends Activity { 
    private ListView lvContacts; 
    private EditText etSearch; 
    private ContactListAdapter mAdapter; 
    private String[] stockArr, stockArr1, stockArr2; 
    private Intent i; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_send_money); 

     initObjects(); 

     ArrayList<String> phoneContactList = new ArrayList<String>(); 
     ArrayList<String> ContactImage = new ArrayList<String>(); 
     ArrayList<String> PhoneNumber = new ArrayList<String>(); 

     ContentResolver cr = getContentResolver(); 
     Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI, null, null, null, null); 

     if (cur.getCount() > 0) { 
      while (cur.moveToNext()) { 
      String id = cur.getString(cur.getColumnIndex(ContactsContract.Contacts._ID)); 
      String name = cur.getString(cur.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME)); 
      String img = cur.getString(cur.getColumnIndex(ContactsContract.Contacts.PHOTO_THUMBNAIL_URI)); 

      if (Integer.parseInt(cur.getString(cur.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER))) > 0) { 
       // This inner cursor is for contacts that have multiple numbers. 
       Cursor pCur = cr.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = ?", new String[] { id }, null); 
       while (pCur.moveToNext()) { 
       String pnumber = pCur.getString(pCur.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER)); 

       ContactImage.add(img); 
       phoneContactList.add(name); 
       PhoneNumber.add(pnumber); 

       Log.i("Contact List", pnumber); 
       } 
       pCur.close(); 
      } 
      } 

      Collections.sort(phoneContactList); 
      int cnt = phoneContactList.size(); // Count of contacts 

      // Convert ArrayList<String> to String[] START 

      // Contacts Name 
      stockArr = new String[phoneContactList.size()]; 
      stockArr = phoneContactList.toArray(stockArr); 

      // Contacts Photo 
      stockArr1 = new String[ContactImage.size()]; 
      stockArr1 = ContactImage.toArray(stockArr1); 

      // Contacts Number 
      stockArr2 = new String[PhoneNumber.size()]; 
      stockArr2 = PhoneNumber.toArray(stockArr2); 

      // Convert ArrayList<String> to String[] END 

      mAdapter = new ContactListAdapter(getApplicationContext(), R.layout.banks_listview_layout, stockArr, stockArr1); 
      lvContacts.setAdapter(mAdapter); 

     } 
     cur.close(); 

     lvContacts.setTextFilterEnabled(true); 
     lvContacts.setOnItemClickListener(new AdapterView.OnItemClickListener() { 

      @Override 
      public void onItemClick(AdapterView<?> adapter, View view, int position, long id) {    
       i = new Intent(SendMoney.this, SendMoneyForm.class); 
       i.putExtra("contact_name", stockArr[position]); 
       i.putExtra("contact_image", stockArr1[position]); 
       i.putExtra("contact_number", stockArr2[position]); 
       startActivity(i); 
      } 
     }); 


     //***************** SEARCH START *********************** 

     etSearch.addTextChangedListener(new TextWatcher() { 

      @Override 
      public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) { 
       // When user changed the Text 
       mAdapter.getFilter().filter(cs.toString()); 
      } 

      @Override 
      public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, 
        int arg3) { 
       // TODO Auto-generated method stub 

      } 

      @Override 
      public void afterTextChanged(Editable arg0) { 
       // TODO Auto-generated method stub       
      } 
     }); 

     //***************** SEARCH END *********************** 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.send_money, menu); 
     return true; 
    } 

    private void initObjects(){ 
     lvContacts = (ListView)findViewById(R.id.lvContacts); 
     etSearch = (EditText)findViewById(R.id.etSearch); 
    } 

我的自定義數組適配器

public class ContactListAdapter extends ArrayAdapter<String> { 
    private LayoutInflater mInflater; 
    private String[] mStrings; 
    private String[] mIcons; 
    private int mViewResourceId; 

    public ContactListAdapter(Context ctx, int resource, 
      String[] option, String[] icons) { 
     super(ctx, resource, option); 

     mInflater = (LayoutInflater)ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     mStrings = option; 
     mIcons = icons;  
     mViewResourceId = resource; 

    } 

    @Override 
     public int getCount() { 
      return mStrings.length; 
     } 

     @Override 
     public String getItem(int position) { 
      return mStrings[position]; 
     } 

     @Override 
     public long getItemId(int position) { 
      return position; 
     } 

     @Override 
     public View getView(int position, View convertView, ViewGroup parent) { 
      convertView = mInflater.inflate(mViewResourceId, null); 

      ImageView iv = (ImageView)convertView.findViewById(R.id.ivBankIcon); 
      if(mIcons[position]==null) { 
       iv.setImageResource(R.drawable.default_picture); 
      } else { 
       iv.setImageURI(Uri.parse(mIcons[position])); 
       Log.d("LALA", mIcons[position]); 
      } 

      TextView tv = (TextView)convertView.findViewById(R.id.tvBankName); 
      tv.setText(mStrings[position]); 

      return convertView; 
     } 
} 

提前感謝！

Answer 1

在自定義適配器中添加此方法。你缺少這種方法

@Override 
    public Filter getFilter() { 
     return new Filter() { 
      @SuppressWarnings("unchecked") 
      @Override 
      protected void publishResults(CharSequence constraint, FilterResults results) { 
       Log.d(Constants.TAG, "**** PUBLISHING RESULTS for: " + constraint); 
       myData = (List<MyDataType>) results.values; 
       MyCustomAdapter.this.notifyDataSetChanged(); 
      } 

      @Override 
      protected FilterResults performFiltering(CharSequence constraint) { 
       Log.d(Constants.TAG, "**** PERFORM FILTERING for: " + constraint); 
       List<MyDataType> filteredResults = getFilteredResults(constraint); 

       FilterResults results = new FilterResults(); 
       results.values = filteredResults; 

       return results; 
      } 
     }; 
    } 

Answer 2

你將不得不覆蓋getFilter method`和創建邏輯過濾數據。

public Filter getFilter()

返回可以使用與過濾圖案來約束數據的過濾器。

該方法通常由Adapter類實現。

EditText search= (EditText) findViewById(R.id.search); 
search.addTextChangedListener(new TextWatcher() { 

    public void onTextChanged(CharSequence s, int start, int before, int count) { 
        adapter.getFilter().filter(s); 

    } 

    public void beforeTextChanged(CharSequence s, int start, int count, 
     int after) { 

     } 

     public void afterTextChanged(Editable s) { 
     } 
     }); 

在您的適配器

@Override 
    public Filter getFilter() { 
    return new Filter() { 
    @Override 
    protected void publishResults(CharSequence constraint, FilterResults results) { 
     if (results != null && results.count >= 0) { 
      //if results of search is not null set the searched results data 
     } else { 
      // set original values 
     } 

     notifyDataSetInvalidated(); 
    } 

然後

@Override 
    protected FilterResults performFiltering(CharSequence constraint) { 
     FilterResults result = new FilterResults(); 
     if(condition) 
      { 

      ArrayList<MyDataType> foundItems = new ArrayList<MyDataType>(); 
      // add items to foundItems if condition matches 

      result.count = foundItems.size();//search results found return count 
      result.values = foundItems;// return values 
     } 
     else 
     { 
      result.count=-1;// no search results found 
     } 


     return result; 
    } 
}; 

}

例子：

Search in ListView with EditText