因此，我无法延长MultiAutoCompleteTextView并使用CursorLoader支持，同时使用自定义Tokenizer。该问题特别针对mAdapter.setCursorToStringConverter();电话。在第一次调用此方法时，具有Cursor作为参数的convertToString()方法具有有效且未闭合的游标。但是，后续调用会导致空游标或关闭游标。我猜这与LoaderManager管理CursorLoader的方式有关。
如果我对setCursorToStringConverter()方法发表评论，那么我会根据我在此视图中输入的文字看到可用选项列表。但是，由于没有实现convertToString()方法，因此自定义terminateToken()的{{1}}方法不会收到我打算使用的字符串，而是一个代表性的游标字符串object，因为游标尚未用于获取结果查询中所需列的当前字符串值。
是否有人能够实现三个类别（Tokenizer，CursorLoader/LoaderManger和MultiAutoCompleteTextView）的组合？
我是否朝着正确的方向前进，或者这根本不可能？
我已经能够实现由Tokenizer支持的自定义MultiAutoCompleteTextView以及自定义SimpleCursorAdapter。我只是想知道是否可以使用Tokenizer来实现这一点，因为Strict Mode抱怨CursorLoader中的游标没有被明确关闭。
非常感谢任何帮助。
MultiAutoCompleteTextView更新1
我现在正在调用public class CustomMultiAutoCompleteTextView extends MultiAutoCompleteTextView
implements LoaderManager.LoaderCallbacks<Cursor> {
private final String DEBUG_TAG = getClass().getSimpleName().toString();
private Messenger2 mContext;
private RecipientsCursorAdapter mAdapter;
private ContentResolver mContentResolver;
private final char delimiter = ' ';
private CustomMultiAutoCompleteTextView mView;
// If non-null, this is the current filter the user has provided.
private String mCurFilter;
// These are the Contacts rows that we will retrieve.
final String[] CONTACTS_SUMMARY_PROJECTION = new String[] {
ContactsContract.Contacts._ID,
ContactsContract.Contacts.DISPLAY_NAME };
public CustomMultiAutoCompleteTextView(Context c) {
super(c);
init(c);
}
public CustomMultiAutoCompleteTextView(Context c, AttributeSet attrs) {
super(c, attrs);
init(c);
}
private void init(Context context) {
mContext = (Messenger2) context;
mContentResolver = mContext.getContentResolver();
mView = this;
mAdapter = new RecipientsCursorAdapter(mContext, 0, null, new String[0], new int[0], mContext);
mAdapter.setCursorToStringConverter(new CursorToStringConverter() {
@Override
public CharSequence convertToString(Cursor c) {
String contactName = c.getString(c.getColumnIndexOrThrow(ContactsContract.Contacts.DISPLAY_NAME));
return contactName;
}
});
addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
Log.d(DEBUG_TAG, "onTextChanged()");
if (!s.equals(""))
mCurFilter = s.toString();
else
mCurFilter = "";
mContext.getLoaderManager().restartLoader(0, null, mView);
}
@Override
public void afterTextChanged(Editable s) {
}
});
setAdapter(mAdapter);
setTokenizer(new SpaceTokenizer());
mContext.getLoaderManager().initLoader(0, null, this);
}
@Override
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
// This is called when a new Loader needs to be created. This
// sample only has one Loader, so we don't care about the ID.
// First, pick the base URI to use depending on whether we are
// currently filtering.
Log.d(DEBUG_TAG, "onCreateLoader()");
Uri baseUri;
if (mCurFilter != null) {
baseUri = Uri.withAppendedPath( ContactsContract.Contacts.CONTENT_FILTER_URI,Uri.encode(mCurFilter));
} else {
baseUri = ContactsContract.Contacts.CONTENT_URI;
}
// Now create and return a CursorLoader that will take care of
// creating a Cursor for the data being displayed.
String selection = "((" + ContactsContract.Contacts.DISPLAY_NAME
+ " NOTNULL) AND ("
+ ContactsContract.Contacts.HAS_PHONE_NUMBER + "=1) AND ("
+ ContactsContract.Contacts.DISPLAY_NAME + " != '' ))";
String sortOrder = ContactsContract.Contacts.DISPLAY_NAME
+ " COLLATE LOCALIZED ASC";
return new CursorLoader(mContext, baseUri, CONTACTS_SUMMARY_PROJECTION,
selection, null, sortOrder);
}
public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
// Swap the new cursor in. (The framework will take care of closing
// the old cursor once we return.)
Log.d(DEBUG_TAG, "onLoadFinished()");
mAdapter.swapCursor(data);
}
public void onLoaderReset(Loader<Cursor> loader) {
// This is called when the last Cursor provided to onLoadFinished()
// above is about to be closed. We need to make sure we are no
// longer using it.
Log.d(DEBUG_TAG, "onLoaderReset()");
mAdapter.swapCursor(null);
}
private class SpaceTokenizer implements Tokenizer {
public int findTokenStart(CharSequence text, int cursor) {
int i = cursor;
while (i > 0 && text.charAt(i - 1) != delimiter) {
i--;
}
while (i < cursor && text.charAt(i) == delimiter) {
i++;
}
return i;
}
public int findTokenEnd(CharSequence text, int cursor) {
int i = cursor;
int len = text.length();
while (i < len) {
if (text.charAt(i) == delimiter) {
return i;
} else {
i++;
}
}
return len;
}
public CharSequence terminateToken(CharSequence text) {
Log.d(DEBUG_TAG, "terminateToken()");
int i = text.length();
while (i > 0 && text.charAt(i - 1) == delimiter) {
i--;
}
if (i > 0 && text.charAt(i - 1) == delimiter) {
return text;
} else {
CharSequence contactName = createContactBubble(text);
return contactName;
}
}
}
}
方法，而不是@Olaf建议的setStringConversionColumn()。我已在setCursorToStringConverter()中设置此项，因为这是onLoadFinished()可用的唯一时间，因为这是实施Cursor。
LoaderManger这适用于为public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
// Swap the new cursor in. (The framework will take care of closing
// the old cursor once we return.)
Log.d(DEBUG_TAG, "onLoadFinished()");
mAdapter.setStringConversionColumn(data.getColumnIndexOrThrow(ContactsContract.Contacts.DISPLAY_NAME));
mAdapter.swapCursor(data);
}
选择一个项目，但不允许在MultiAutoCompleteTextView中选择多个项目。
我猜测MultiAutoCompleteTextView方法存在一些问题，因为它调用了onTextChanged()。这适用于此视图中的第一个条目，但不适用于后续条目。我现在不太确定会出现什么问题。
更新2
所以我发现了这个问题。问题是TextWatcher的restartLoader()方法。在选择终止第一个令牌后（假设令牌是“Joe Johnson”），然后在此onTextChanged()中输入更多字符（例如MultiAutoCompleteTextView）arg {{1}的值传递到al方法的方法现在不仅包含额外添加的字符，还包含先前已终止的令牌中的字符（此时s的值为onTextChanged() ）。现在，s的值设置为Joe Johnson al，随后会传递到mCursor中的查询，这显然不会返回任何结果。这种情况有什么方法吗？我对任何建议持开放态度。
更新3
当我实施由Joe Johnson al支持的自定义onCreateLoader()以及自定义MultiAutoCompleteTextView时，我设置了SimpleCursorAdapter，如下所示：
Tokenizer由于某些原因，FilterQueryProvider方法从TextWatcher的mAdapter.setFilterQueryProvider(new FilterQueryProvider() {
@Override
public Cursor runQuery(CharSequence constraint) {
Log.d(DEBUG_TAG, "runQuery() : constraint " + constraint);
Uri baseUri;
if (constraint != null) {
baseUri = Uri.withAppendedPath(ContactsContract.Contacts.CONTENT_FILTER_URI,
Uri.encode(constraint.toString()));
} else {
baseUri = ContactsContract.Contacts.CONTENT_URI;
}
String selection = "((" + ContactsContract.Contacts.DISPLAY_NAME
+ " NOTNULL) AND ("
+ ContactsContract.Contacts.HAS_PHONE_NUMBER + "=1) AND ("
+ ContactsContract.Contacts.DISPLAY_NAME + " != '' ))";
final String[] CONTACTS_SUMMARY_PROJECTION = new String[] {
ContactsContract.Contacts._ID,
ContactsContract.Contacts.DISPLAY_NAME};
String sortOrder = ContactsContract.Contacts.DISPLAY_NAME
+ " COLLATE LOCALIZED ASC";
Cursor c = mContentResolver.query(baseUri,
CONTACTS_SUMMARY_PROJECTION, selection, null, sortOrder);
return c;
}
});
方法调用两次：
runQuery()因此，在我之前的示例中，第一次传递到onTextChanged()方法的public void onTextChanged(CharSequence s, int start, int before,
int count) {
Log.d(DEBUG_TAG, "onTextChanged() : s " + s);
mAdapter.getFilterQueryProvider().runQuery(s);
}
变量是constraint。然后第二次调用runQuery()方法，Joe Johnson al变量的值为runQuery()。我不知道为什么constraint方法只在al方法中调用一次时运行两次。
答案 0 :(得分：3)
基本上，机器人自动完成textview不是很强大，当我必须处理更大量的数据时，我所做的是，我保持文本更改监听器的编辑文本以进行搜索，然后每当更改某些内容时编辑文本，查询数据库。
如果这对某人有帮助，可以在onCreate上放置一个edittext
EditText etSearch = (EditText)findViewById(R.id.etSearchBox);
etSearch.addTextChangedListener(filterTextWatcher);
//The filterTextWatcher is
private TextWatcher filterTextWatcher = new TextWatcher() {
@Override
public void afterTextChanged(Editable s) {
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before,int count) {
adapter.getFilter().filter(s.toString());
}
};
因此，在你的适配器中，你需要创建一个getFilter（）方法......
@Override
public Filter getFilter() {
if (nameFilter == null) {
nameFilter = new NameFilter();
}
return nameFilter;
}
private class NameFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults();
Cursor cursor = null;
// get your cursor by passing appropriate query here
results.values = cursor;
results.count = cursor.getCount();
return results;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
notifyDataSetChanged();
}
}