我一直在努力AutoCompleteTextView
。 我能得到的建议和所有在下拉列表中,我们输入。
我的问题是:我们可以突出的建议输入的字符下拉列表?
我一直在努力AutoCompleteTextView
。 我能得到的建议和所有在下拉列表中,我们输入。
我的问题是:我们可以突出的建议输入的字符下拉列表?
我已经实现的功能。 该解决方案如下:
AutoCompleteAdapter.java
public class AutoCompleteAdapter extends ArrayAdapter<String> implements
Filterable {
private ArrayList<String> fullList;
private ArrayList<String> mOriginalValues;
private ArrayFilter mFilter;
LayoutInflater inflater;
String text = "";
public AutoCompleteAdapter(Context context, int resource,
int textViewResourceId, List<String> objects) {
super(context, resource, textViewResourceId, objects);
fullList = (ArrayList<String>) objects;
mOriginalValues = new ArrayList<String>(fullList);
inflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
return fullList.size();
}
@Override
public String getItem(int position) {
return fullList.get(position);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = convertView;
// tvViewResourceId = (TextView) view.findViewById(android.R.id.text1);
String item = getItem(position);
Log.d("item", "" + item);
if (convertView == null) {
convertView = view = inflater.inflate(
android.R.layout.simple_dropdown_item_1line, null);
}
// Lookup view for data population
TextView myTv = (TextView) convertView.findViewById(android.R.id.text1);
myTv.setText(highlight(text, item));
return view;
}
@Override
public Filter getFilter() {
if (mFilter == null) {
mFilter = new ArrayFilter();
}
return mFilter;
}
private class ArrayFilter extends Filter {
private Object lock;
@Override
protected FilterResults performFiltering(CharSequence prefix) {
FilterResults results = new FilterResults();
if (prefix != null) {
text = prefix.toString();
}
if (mOriginalValues == null) {
synchronized (lock) {
mOriginalValues = new ArrayList<String>(fullList);
}
}
if (prefix == null || prefix.length() == 0) {
synchronized (lock) {
ArrayList<String> list = new ArrayList<String>(
mOriginalValues);
results.values = list;
results.count = list.size();
}
} else {
final String prefixString = prefix.toString().toLowerCase();
ArrayList<String> values = mOriginalValues;
int count = values.size();
ArrayList<String> newValues = new ArrayList<String>(count);
for (int i = 0; i < count; i++) {
String item = values.get(i);
if (item.toLowerCase().contains(prefixString)) {
newValues.add(item);
}
}
results.values = newValues;
results.count = newValues.size();
}
return results;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint,
FilterResults results) {
if (results.values != null) {
fullList = (ArrayList<String>) results.values;
} else {
fullList = new ArrayList<String>();
}
if (results.count > 0) {
notifyDataSetChanged();
} else {
notifyDataSetInvalidated();
}
}
}
public static CharSequence highlight(String search, String originalText) {
// ignore case and accents
// the same thing should have been done for the search text
String normalizedText = Normalizer
.normalize(originalText, Normalizer.Form.NFD)
.replaceAll("\\p{InCombiningDiacriticalMarks}+", "")
.toLowerCase(Locale.ENGLISH);
int start = normalizedText.indexOf(search.toLowerCase(Locale.ENGLISH));
if (start < 0) {
// not found, nothing to to
return originalText;
} else {
// highlight each appearance in the original text
// while searching in normalized text
Spannable highlighted = new SpannableString(originalText);
while (start >= 0) {
int spanStart = Math.min(start, originalText.length());
int spanEnd = Math.min(start + search.length(),
originalText.length());
highlighted.setSpan(new ForegroundColorSpan(Color.BLUE),
spanStart, spanEnd, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
start = normalizedText.indexOf(search, spanEnd);
}
return highlighted;
}
}
}
MainActivity.java
public class MainActivity extends Activity {
String[] languages = { "C", "C++", "Java", "C#", "PHP", "JavaScript",
"jQuery", "AJAX", "JSON" };
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
List<String> wordList = new ArrayList<String>();
Collections.addAll(wordList, languages);
AutoCompleteAdapter adapter = new AutoCompleteAdapter(this,
android.R.layout.simple_dropdown_item_1line,
android.R.id.text1,wordList);
AutoCompleteTextView acTextView = (AutoCompleteTextView) findViewById(R.id.languages);
acTextView.setThreshold(1);
acTextView.setAdapter(adapter);
}
}
工作般的魅力!
请享用!
我认为,应该是可能的,前提是你知道的字符(一个或多个)用户输入最后的索引/指数。 然后,您可以使用SpannableStringBuilder
并设置ForegroundColorSpan
和BackgroundColorSpan
给予字符(S)的一大亮点的出现。
这个想法看起来有点像这样:
// start & end of the highlight
int start = ...;
int end = ...;
SpannableStringBuilder builder = new SpannableStringBuilder(suggestionText);
// set foreground color (text color) - optional, you may not want to change the text color too
builder.setSpan(new ForegroundColorSpan(Color.RED), start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
// set background color
builder.setSpan(new BackgroundColorSpan(Color.YELLOW), start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
// set result to AutoCompleteTextView
autocompleteTextview.setText(builder);
请注意,“亮点”仍将只要你不输入其他字符。 您可能希望当例如用户改变光标位置删除亮点AutoCompleteTextView
,但我会离开,给你。
我知道它的后期为回答这个问题,但作为我个人作战找到答案,最后我自己写的(与@MH ofcourse答案的帮助。),所以在这里它是:
首先,你必须创建一个自定义ArrayAdapter:
public class AdapterAustocomplete extends ArrayAdapter<String> {
private static final String TAG = "AdapterAustocomplete";
String q = "";
public AdapterAustocomplete(Context context, int resource, List objects) {
super(context, resource, objects);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
String item = getItem(position);
// Check if an existing view is being reused, otherwise inflate the view
if (convertView == null) {
convertView =
// I'll use a custom view for each Item , this way I can customize it also!
G.inflater.from(getContext()).inflate(R.layout.textview_autocomplete, parent, false);
}
// Lookup view for data population
TextView myTv = (TextView) convertView.findViewById(R.id.txt_autocomplete);
int start = item.indexOf(q);
int end = q.length()+start;
SpannableStringBuilder builder = new SpannableStringBuilder(item);
builder.setSpan(new ForegroundColorSpan(Color.RED), start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
myTv.setText(builder);
return convertView;
}
public void setQ(String q) {
this.q = q;
}
}
而在要设置AutoCompleteTextView适配器的代码;
AutoCompleteTextView myAutoComplete = findViewById(its_id);
AdapterAustocomplete adapter_autoComplete = new AdapterAustocomplete(getActivity(), 0, items); // items is an arrayList of Strings
adapter_autoComplete.setQ(q);
myAutoComplete.setAdapter(adapter_autoComplete);