AutoCompleteTextView不按预期方式工作

Question

我正在使用AutoCompleteTextView的应用程序，并且面临着很少的问题。请找到以下问题的详细信息。

下面的值是存在于数据：

1）和Manish洛根耆那

2）MJ（洛根芬）

3）洛根

问题：

1）当用户搜索Manish时，Manish Logan Jain被显示为一个建议。但是当用户输入Logan Jain时，没有结果返回。

2）当用户输入Logan时，我期望第二个值被显示为建议，但是目前，建议列表不显示任何内容。

3）当用户进入ogan时，期待显示建议3。目前，它没有显示。

AutoCompleteView XML：

AutoCompleteTextView

android:id="@+id/autoCompleteTextView1" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentTop="true" 
    android:ems="10" 
    android:hint="@string/enter_user_name" > 

    <requestFocus /> 
</AutoCompleteTextView> 

用于填充数据

Java代码：

List<String> namesList = new ArrayList<String>(stops); 
    namesList.add("Manish Logan Jain"); 
    namesList.add("Logan"); 
    namesList.add("M. J. (Logan Fern)"); 

    ArrayAdapter<String> namesSuggestion = new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line, namesList); 
    AutoCompleteTextView textView = (AutoCompleteTextView)      findViewById(R.id.autoCompleteTextView1); 
    textView.setAdapter(namesSuggestion); 
    textView.setThreshold(1); 

已经有人遇到了类似的问题？如果是，那么对此有什么可能的解决方案？

Answer 1

使用一个CursorAdapter为您的ACTV和呼叫setFilterQueryProvider（FilterQueryProvider），用于自定义过滤（使用MatrixCursor用于已过滤的数据）

编辑：样品FilterQueryProvider

class FQP extends LinkedList<String> implements FilterQueryProvider { 
    @Override 
    public Cursor runQuery(CharSequence constraint) { 
     if (constraint == null) { 
      return null; 
     } 
     Log.d("TAG", "runQuery " + constraint); 

     String lowerConstraint = constraint.toString().toLowerCase(); 
     String[] columns = { 
       "_id", "name" 
     }; 
     int id = 0; 
     MatrixCursor c = new MatrixCursor(columns); 
     for (String name : this) { 
      String lowerName = name.toLowerCase(); 
      if (lowerName.indexOf(lowerConstraint) != -1) { 
       c.newRow().add(id++).add(name); 
      } 
     } 
     return c; 
    } 
}; 

在的onCreate以下测试：

LinearLayout ll = new LinearLayout(this); 
ll.setOrientation(LinearLayout.VERTICAL); 
AutoCompleteTextView actv = new AutoCompleteTextView(this); 
String[] from = {"name"}; 
int[] to = {android.R.id.text1}; 
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, android.R.layout.simple_dropdown_item_1line, null, from, to); 
FQP fqp = new FQP(); 
fqp.add("Manish Logan Jain"); 
fqp.add("Logan"); 
fqp.add("M. J. (Logan Fern)"); 
adapter.setFilterQueryProvider(fqp); 
actv.setAdapter(adapter); 
actv.setThreshold(1); 
ll.addView(actv); 
setContentView(ll); 

Answer 2

使用实现可过滤的自定义适配器。在getFilter方法中，根据您的要求使用String.contains（）。

请检查this link.

Answer 3

你想找的是不能直接完成。但我建议你使用MultiCompleteTextView。

参考以下链接： http://www.c-sharpcorner.com/uploadfile/manish1231/autocomplete-and-multicomplete-textview-in-mono-for-android/

Answer 4

试试下面的代码：

public class AutoCompleteAdapter extends ArrayAdapter<Address> implements Filterable { 

    private LayoutInflater mInflater; 
    private Geocoder mGeocoder; 
    private StringBuilder mSb = new StringBuilder(); 

    public AutoCompleteAdapter(final Context context) { 
     super(context, -1); 
     mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     mGeocoder = new Geocoder(context); 
    } 

    @Override 
    public View getView(final int position, final View convertView, final ViewGroup parent) { 
     final TextView tv; 
     if (convertView != null) { 
      tv = (TextView) convertView; 
     } else { 
      tv = (TextView) mInflater.inflate(android.R.layout.simple_dropdown_item_1line, parent, false); 
     } 

     tv.setText((createFormattedAddressFromAddress(getItem(position)))); 
     return tv; 
    } 

    private String createFormattedAddressFromAddress(final Address address) { 
     mSb.setLength(0); 
     final int addressLineSize = address.getMaxAddressLineIndex(); 
     for (int i = 0; i < addressLineSize; i++) { 
      mSb.append(address.getAddressLine(i)); 
      if (i != addressLineSize - 1) { 
       mSb.append(", "); 
      } 
     } 
     return mSb.toString(); 
    } 

    @Override 
    public Filter getFilter() { 
     Filter myFilter = new Filter() { 
      @Override 
      protected FilterResults performFiltering(final CharSequence constraint) { 
       List<Address> addressList = null; 
       if (constraint != null) { 
        try { 
         addressList = mGeocoder.getFromLocationName((String) constraint, 5,23.0,72.0,23.9,72.9); 
        } catch (IOException e) { 
        } 
       } 
       if (addressList == null) { 
        addressList = new ArrayList<Address>(); 
       } 

       final FilterResults filterResults = new FilterResults(); 
       filterResults.values = addressList; 
       filterResults.count = addressList.size(); 

       return filterResults; 
      } 

      @SuppressWarnings("unchecked") 
      @Override 
      protected void publishResults(final CharSequence contraint, final FilterResults results) { 
       clear(); 
       for (Address address : (List<Address>) results.values) { 
        add(address); 
       } 
       if (results.count > 0) { 
        notifyDataSetChanged(); 
       } else { 
        notifyDataSetInvalidated(); 
       } 
      } 

      @Override 
      public CharSequence convertResultToString(final Object resultValue) { 
       return resultValue == null ? "" : ((createFormattedAddressFromAddress((Address) resultValue).split(", Ahmedabad")[0].length()<6)?createFormattedAddressFromAddress((Address) resultValue).split(", Gujarat")[0]:createFormattedAddressFromAddress((Address) resultValue).split(", Ahmedabad")[0]); 
      } 
     }; 
     return myFilter; 
    } 
} 

Answer 5

默认结果集的字符串由处理开关输入字符串作为前缀返回。这是在一个ArrayFilter对象中实现的。代码就像

/** 
* <p>An array filter constrains the content of the array adapter with 
* a prefix. Each item that does not start with the supplied prefix 
* is removed from the list.</p> 
*/ 
private class ArrayFilter extends Filter { 
    @Override 
    protected FilterResults performFiltering(CharSequence prefix) { 
     FilterResults results = new FilterResults(); 

     if (mOriginalValues == null) { 
      synchronized (mLock) { 
       mOriginalValues = new ArrayList<T>(mObjects); 
      } 
     } 

     if (prefix == null || prefix.length() == 0) { 
      synchronized (mLock) { 
       ArrayList<T> list = new ArrayList<T>(mOriginalValues); 
       results.values = list; 
       results.count = list.size(); 
      } 
     } else { 
      String prefixString = prefix.toString().toLowerCase(); 

      final ArrayList<T> values = mOriginalValues; 
      final int count = values.size(); 

      final ArrayList<T> newValues = new ArrayList<T>(count); 

      for (int i = 0; i < count; i++) { 
       final T value = values.get(i); 
       final String valueText = value.toString().toLowerCase(); 

       // First match against the whole, non-splitted value 
       if (valueText.startsWith(prefixString)) { 
        newValues.add(value); 
       } else { 
        final String[] words = valueText.split(" "); 
        final int wordCount = words.length; 

        for (int k = 0; k < wordCount; k++) { 
         if (words[k].startsWith(prefixString)) { 
          newValues.add(value); 
          break; 
         } 
        } 
       } 
      } 

      results.values = newValues; 
      results.count = newValues.size(); 
     } 

     return results; 
    } 

如果要将返回字符串更改为包含输入字符串的集合，则需要定制ArrayFilter。