我一直在尝试对listView进行简单的搜索，我已经能够使用Volley进行填充，但直到最后都无济于事。感谢 @Dhaval Patel ，他们一直在寻求帮助。但我现在遇到的问题是，当我搜索时， ListView拒绝更改内容，从而使其搜索在程序中无用
以下是我的代码：
public class MainActivity extends Activity {
private ListView mList;
private List<Movie> movieList = new ArrayList<Movie>();
EditText inputSearch;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
setContentView(R.layout.activity_main);
mList = (ListView) findViewById(R.id.list);
inputSearch = (EditText) findViewById(R.id.inputSearch);
adapter = new CustomListAdapter(this, movieList);
mList.setAdapter(adapter);
//SEARCH TEXTCHANGE
inputSearch.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
// When user changed the Text
MainActivity.this.adapter.getFilter().filter(cs.toString());
//FLAGS Cannot resolve method 'getFilter()' here
}
@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
}
});
}
}
这也是我的CustomListAdapter类
中的代码public class CustomListAdapter extends BaseAdapter {
private Activity activity;
private LayoutInflater inflater;
private List<Movie> movieItems;
private String[] bgColors;
private List<String>originalData = null;
private List<String>filteredData = null;
private ItemFilter mFilter = new ItemFilter();
ImageLoader imageLoader = MyApplication.getInstance().getImageLoader();
public CustomListAdapter(Activity activity, List<Movie> movieItems) {
this.activity = activity;
this.movieItems = movieItems;
bgColors = activity.getApplicationContext().getResources().getStringArray(R.array.movie_serial_bg);
}
@Override
public int getCount() {
return movieItems.size();
}
@Override
public Object getItem(int location) {
return movieItems.get(location);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (inflater == null)
inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null)
convertView = inflater.inflate(R.layout.list_row_image, null);
if (imageLoader == null)
imageLoader = MyApplication.getInstance().getImageLoader();
NetworkImageView thumbNail = (NetworkImageView) convertView.findViewById(R.id.thumbnail);
TextView serial = (TextView) convertView.findViewById(R.id.serial);
TextView title = (TextView) convertView.findViewById(R.id.title);
TextView rating = (TextView) convertView.findViewById(R.id.rating);
TextView genre = (TextView) convertView.findViewById(R.id.genre);
TextView year = (TextView) convertView.findViewById(R.id.releaseYear);
// getting movie data for the row
Movie m = movieItems.get(position);
// thumbnail image
thumbNail.setImageUrl(m.getThumbnailUrl(), imageLoader);
// title
title.setText(m.getTitle());
// rating
rating.setText("Rating: " + String.valueOf(m.getRating()));
// genre
String genreStr = "";
for (String str : m.getGenre()) {
genreStr += str + ", ";
}
genreStr = genreStr.length() > 0 ? genreStr.substring(0,
genreStr.length() - 2) : genreStr;
genre.setText(genreStr);
// release year
year.setText(String.valueOf(m.getYear()));
String color = bgColors[position % bgColors.length];
serial.setBackgroundColor(Color.parseColor(color));
return convertView;
}
public Filter getFilter() {
return mFilter;
}
private class ItemFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
String filterString = constraint.toString().toLowerCase();
FilterResults results = new FilterResults();
final List<String> list = originalData;
int count = list.size();
final ArrayList<String> nlist = new ArrayList<String>(count);
String filterableString ;
for (int i = 0; i < count; i++) {
filterableString = list.get(i);
if (filterableString.toLowerCase().contains(filterString)) {
nlist.add(filterableString);
}
}
results.values = nlist;
results.count = nlist.size();
return results;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
filteredData = (ArrayList<String>) results.values;
notifyDataSetChanged();
}
}
}
有人可以告诉我我做得不对。 提前致谢
答案 0 :(得分：2)
|答案 1 :(得分：1)
您似乎没有在适配器中使用filteredData。
因此，当您致电notifiyDataSetChanged时，数据使用中没有任何变化来填充ListView。
publishResults方法应该更改用于填充视图的数据，即movieItems列表。
private class ItemFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
String filterString = constraint.toString().toLowerCase();
FilterResults results = new FilterResults();
final List<Movie> list = originalMovieItems;
int count = list.size();
final ArrayList<Movie> nlist = new ArrayList<Movie>(count);
String filterableString ;
for (int i = 0; i < count; i++) {
filterableString = list.get(i).getName();//or whatever you want to filter on
if (filterableString.toLowerCase().contains(filterString)) {
nlist.add(list.get(i));
}
}
results.values = nlist;
results.count = nlist.size();
return results;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
movieList = (ArrayList<Movie>) results.values;
notifyDataSetChanged();
}
}
因此，为了保持影片列表不变（不是你显示的那个，而是你过滤的那个），你应该将一个originalMovieList字段添加到你的适配器类中，并修改构造函数如下。
public CustomListAdapter(Activity activity, List<Movie> movieItems) {
this.activity = activity;
this.movieItems = movieItems;
bgColors = activity.getApplicationContext().getResources().getStringArray(R.array.movie_serial_bg);
this.originalMovieList = movieItems;
}
答案 2 :(得分：1)
这就是我能够解决搜索代码痛苦的方法。
在我的 MainActivity
上public class MainActivity extends Activity {
private List<Movie> currentMovieList = new ArrayList<Movie>();
private List<Movie> originalMovieList = new ArrayList<Movie>();
private CustomListAdapter adapter;
private ListView mList;
// Search EditText
EditText inputSearch;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
setContentView(R.layout.activity_main);
inputSearch = (EditText) findViewById(R.id.inputSearch);
adapter = new CustomListAdapter(this, currentMovieList);
mList.setAdapter(adapter);
inputSearch.addTextChangedListener(new TextWatcher() {
public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
// When user changed the Text
String filterString = cs.toString().toLowerCase();
Log.e("TAG", "filterString:" + filterString);
currentMovieList.clear();
if (TextUtils.isEmpty(filterString)) {
currentMovieList.addAll(originalMovieList);
}
String filterableString;
for (Movie movie : originalMovieList) {
//search from the title field
if (movie.getTitle().toLowerCase().contains(filterString)) {
currentMovieList.add(movie);
}
//search from the year field
else if (String.valueOf(movie.getYear()).toLowerCase().contains(filterString))
{
currentMovieList.add(movie);
}
//search from the rating field
else if (String.valueOf(movie.getRating()).toLowerCase().contains(filterString))
{
currentMovieList.add(movie);
}
//search from the genre field
else if (movie.getGenre().toString().toLowerCase().contains(filterString))
{
currentMovieList.add(movie);
}
}
adapter.notifyDataSetChanged();
//FLAGS Cannot resolve method 'getFilter()' here
}
@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
}
});
} }
并将其添加到 CustomListAdapter
public class CustomListAdapter extends BaseAdapter implements Filterable {
private Activity activity;
private LayoutInflater inflater;
private List<String>originalData = null;
// private List<String>filteredData = null;
private List<Movie> movieItems;
private List<Movie> originalMovieList;
private String[] bgColors;
ImageLoader imageLoader = MyApplication.getInstance().getImageLoader();
private ItemFilter mFilter = new ItemFilter();
public CustomListAdapter(Activity activity, List<Movie> movieItems) {
this.activity = activity;
this.movieItems = movieItems;
// this.originalMovieList = movieItems;
this.originalMovieList = new ArrayList<Movie>(movieItems);
bgColors = activity.getApplicationContext().getResources().getStringArray(R.array.movie_serial_bg);
}
//Add Below Method
public void reloadData(){
this.originalMovieList = new ArrayList<Movie>(movieItems);
notifyDataSetChanged();
}
@Override
public int getCount() {
return movieItems.size();
}
@Override
public Object getItem(int location) {
return movieItems.get(location);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (inflater == null)
inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null)
convertView = inflater.inflate(R.layout.list_row_image, null);
if (imageLoader == null)
imageLoader = MyApplication.getInstance().getImageLoader();
NetworkImageView thumbNail = (NetworkImageView) convertView.findViewById(R.id.thumbnail);
TextView serial = (TextView) convertView.findViewById(R.id.serial);
TextView title = (TextView) convertView.findViewById(R.id.title);
TextView rating = (TextView) convertView.findViewById(R.id.rating);
TextView genre = (TextView) convertView.findViewById(R.id.genre);
TextView year = (TextView) convertView.findViewById(R.id.releaseYear);
// getting movie data for the row
Movie m = movieItems.get(position);
// thumbnail image
thumbNail.setImageUrl(m.getThumbnailUrl(), imageLoader);
// title
title.setText(m.getTitle());
// rating
rating.setText("Rating: " + String.valueOf(m.getRating()));
// genre
String genreStr = "";
for (String str : m.getGenre()) {
genreStr += str + ", ";
}
genreStr = genreStr.length() > 0 ? genreStr.substring(0,
genreStr.length() - 2) : genreStr;
genre.setText(genreStr);
// release year
year.setText(String.valueOf(m.getYear()));
String color = bgColors[position % bgColors.length];
serial.setBackgroundColor(Color.parseColor(color));
return convertView;
}
public Filter getFilter() {
return mFilter;
}
private class ItemFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
String filterString = constraint.toString().toLowerCase();
FilterResults results = new FilterResults();
//results.values = nlist;
//results.count = nlist.size();
results.values = originalMovieList;
results.count = originalMovieList.size();
return results;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
//filteredData = (ArrayList<String>) results.values;
//movieItems = (ArrayList<Movie>) results.values;
movieItems.clear();
movieItems.addAll((ArrayList<Movie>) results.values);
notifyDataSetChanged();
}
}
}
现在这是一个WRAP。感谢 @DhavalPatel 那个Guy是Android大师。
He made all this happen。
- 快乐编码