如何过滤自定义SimpleCursorAdapter

Question

为了在Listview中显示联系人姓名和手机号码，我创建了一个自定义SimpleCursorAdapter来填充Listview，这很好用。

比我添加EditText控件到布局（在Listview顶部）进行过滤。

EditText的代码如下 -

final EditText searchText = (EditText)findViewById(R.id.FilterTB);
        searchText.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

            }

            @Override
            public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {

            }

            @Override
            public void afterTextChanged(Editable editable) {
                String text = searchText.getText().toString().toLowerCase(Locale.getDefault());
                mySimpleCursorAdapter.getFilter().filter(text);
            }
        });

此代码不起作用。

如何以及什么是过滤客户SimpleCursorAdapter的正确方法？

编辑：

我的适配器类跟随 -

public class mySimpleCursorAdapter extends SimpleCursorAdapter {

HashMap selectedList;
Context cntx;

@Override
public void bindView(View view, Context context, Cursor cursor) {
    super.bindView(view, context, cursor);

    TextView tt = (TextView)view.findViewById(R.id.txtName);
    String cid = cursor.getString(cursor.getColumnIndex( ContactsContract.Contacts._ID ));
    int a = cursor.getPosition();

    if(selectedList.containsKey(cid)){

        tt.setTextColor(Color.RED);
    } else{
        tt.setTextColor(Color.WHITE);
    }
}

private void saveSelectedList(){

    SharedPreferences sharedPreferences = cntx.getSharedPreferences("myEvaluators", Context.MODE_PRIVATE);

    String sl = "";
    for (Object key : selectedList.keySet()){
        //iterate over key
        sl = sl + key.toString() + ";";
    }
    if(sl.length()>0) sl=sl.substring(0,sl.length()-1);
    sharedPreferences.edit().putString("evaluators",sl).apply();
}

private void loadSelectedList(){
    SharedPreferences sharedPreferences = 
cntx.getSharedPreferences("myEvaluators", Context.MODE_PRIVATE);

    String sl  = sharedPreferences.getString("evaluators","");

    String strArr[] = sl.split(";");

    for (String s: strArr
         ) {
        selectedList.put(s,s);

    }
}

private void clearSelectedItems(){

    for (Object s: selectedList.keySet()
         ) {

        selectedList.remove(s);

    }
    saveSelectedList();
}

public void setClearSelectedItem(String _id, View v){
    TextView tv = (TextView)v.findViewById(R.id.txtName);
    if(selectedList.containsKey(_id)){
        selectedList.remove(_id);
        tv.setTextColor(Color.WHITE);
        v.setTag(0);
    } else{
        selectedList.put(_id,_id);
        tv.setTextColor(Color.RED);
        v.setTag(null);
    }

    saveSelectedList();
}

@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
    return super.newView(context, cursor, parent);
}

public mySimpleCursorAdapter(Context context, int layout, Cursor c, String[] from, int[] to, int flags) {
    super(context, layout, c, from, to, flags);
    selectedList = new HashMap();
    cntx = context;
    loadSelectedList();
}
}

Answer 1

我建议另一个approch，AutoCompleteTextView和SimpleCursorAdapter一起加载联系人...

首先将AutoCompleteTextView放入Activity的布局xml文件中。

这是活动代码

public class MainActivity extendsActivity {
SimpleCursorAdapter mAdapter;

protected void onCreate(Bundle savedInstance) {
setContentView(R.layout.activity_main);

//assume that your AutoCompleteTextView element in your xml file is autoCompleteView
AutoCompleteTextView completeTextView = (AutoCompleteTextView) findViewById(R.id.autoCompleteView);

mAdapter = new SimpleCursorAdapter(this, android.R.layout.simple_list_item_1, null, 
                             new String[] { Contacts.DISPLAY_NAME },
                             new int[] {android.R.id.text1}, 
                             0);
completeTextView.setAdapter(mAdapter);

mAdapter.setFilterQueryProvider(new FilterQueryProvider() {
 public Cursor runQuery(CharSequence str) {
   return getCursor(str);
 } });

mAdapter.setCursorToStringConverter(new CursorToStringConverter() {
 public CharSequence convertToString(Cursor cur) {
   int index = cur.getColumnIndex(Contacts.DISPLAY_NAME);
   return cur.getString(index);
}});
}
}

我们刚做了两件事。首先调用setFilterQueryProvider。当我们在AutoCompleteTextView中更改内容时，每次执行此回调，FilterQueryProvider的runQuery函数。实际上这是重点。

其次，调用setCursorToStringConverter时，它在我们选择项时使用，它执行此函数将游标转换为String。

最后，一个缺失点，我们还没有共享getCursor（CharSequence str）函数。让我在下面分享。

public Cursor getCursor(CharSequence str) {
String select = "(" + Contacts.DISPLAY_NAME + " LIKE ? ";
String[]  selectArgs = { "%" + str + "%"};
String[] contactsProjection = new String[] {
         Contacts._ID,
         Contacts.DISPLAY_NAME,
         Contacts.LOOKUP_KEY,  };

return getContentResolver().query(Contacts.CONTENT_URI, contactsProjection, 
select, selectArgs, null); 
}

将以上函数添加到您的活动类。

不要忘记在Android Manifest文件中添加READ_CONTACTS权限，以使此代码正常运行。

希望这是有帮助的。