我在这里有两个问题。
第一个问题是:: 在我的CustomListAdapter中实现Filterable接口以启用列表数据搜索后，我意识到每次尝试重新加载列表视图时，它拒绝填充列表视图，即使我能够从我的服务器获取数据。 （我的ListView总是在设备方向更改时重新加载，我还添加了一个重新加载按钮来重新加载listView onclick）
第二个问题是:: 我的搜索EditView非常好地填充了我的listView但是我意识到当我清空EditView时，ListView中的先前数据不会还原/来 - 回到之前的内容
以下是我的活动代码
public class MainActivity extends Activity {
private ListView mList;
private List<Movie> movieList = new ArrayList<Movie>();
EditText inputSearch;
private CustomListAdapter adapter;
private ImageView reload_img;
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);
reload_img = (ImageView) findViewById(R.id.reload_list);
adapter = new CustomListAdapter(this, movieList);
mList.setAdapter(adapter);
//FETCH Movie-Data FROM SERVER TO LIST
fetchMovie();
//Reload image click
reload_img.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
reload_list();
}
});
//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
}
});
}
//RELOAD LISTVIEW METHOD
private void reload_list()
{
pDialog = new ProgressDialog(MainActivity.this);
// Showing progress dialog before making http request
pDialog.setMessage("Synchronising....");
pDialog.show();
pDialog.setCancelable(false);
pDialog.setCanceledOnTouchOutside(false);
flag_loading = true;
offSet = 0;
inputSearch.setText("");
movieList.clear();
fetchMovie();
//adapter.notifyDataSetChanged();
}
//LOAD DATA FROM SERVER TO LISTVIEW USING VOLLEY
private void fetchMovie()
{
// showing refresh animation before making http call
//swipeRefreshLayout.setRefreshing(true);
// appending offset to url
String url = Config.URL_TOP_250_URL + offSet;
//String url = Config.MOVIE_JSON_URL;
//String url = Config.MOVIE_JSON_URL_SHORT;
// Toast.makeText(MainActivity.this,
// "::Json loaded:: ", Toast.LENGTH_SHORT).show();
JsonArrayRequest movieReq = new JsonArrayRequest(url,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
// Log.d(TAG, response.toString());
hidePDialog();
if (response.length() > 0) {
//Toast.makeText(MainActivity.this,
// "Json String : \n"+ response.toString(), Toast.LENGTH_LONG).show();
// Parsing json
/**/ for (int i = 0; i < response.length(); i++) {
try {
JSONObject obj = response.getJSONObject(i);
int rank = obj.getInt("rank");
Movie movie = new Movie();
// movie.setRank(obj.getInt("rank"));
movie.setTitle(obj.getString("title"));
movie.setThumbnailUrl(obj.getString("image"));
movie.setRating(((Number) obj.get("rating"))
.doubleValue());
movie.setYear(obj.getInt("releaseYear"));
// Genre is json array
JSONArray genreArry = obj.getJSONArray("genre");
ArrayList<String> genre = new ArrayList<String>();
for (int j = 0; j < genreArry.length(); j++) {
genre.add((String) genreArry.get(j));
}
movie.setGenre(genre);
// adding movie to movies array
movieList.add(movie);
// updating offset value to highest value
if (rank >= offSet)
offSet = rank;
flag_loading = false;
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(MainActivity.this,
"Network connection error \n "+ e.getMessage(), Toast.LENGTH_LONG).show();
}
}
/**/
// notifying list adapter about data changes
// so that it renders the list view with updated data
adapter.notifyDataSetChanged();
}
else {
Toast.makeText(MainActivity.this,
"End of movie-list" , Toast.LENGTH_LONG).show();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error :: " + error.getMessage());
hidePDialog();
}
});
// Adding request to request queue
MyApplication.getInstance().addToRequestQueue(movieReq);
}
}
这是我的CustomListAdapter中的代码
public class CustomListAdapter extends BaseAdapter {
private Activity activity;
private LayoutInflater inflater;
private List<Movie> movieItems;
private List<Movie> originalMovieList;
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;
this.originalMovieList = 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;
final List<Movie> list = movieItems;
int count = list.size();
// final ArrayList<String> nlist = new ArrayList<String>(count);
final ArrayList<Movie> nlist = new ArrayList<Movie>(count);
String filterableString ;
for (int i = 0; i < count; i++) {
filterableString = list.get(i).getTitle();
if (filterableString.toLowerCase().contains(filterString)) {
// nlist.add(filterableString);
nlist.add(list.get(i));
}
}
results.values = nlist;
results.count = nlist.size();
return results;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
//filteredData = (ArrayList<String>) results.values;
movieItems = (ArrayList<Movie>) results.values;
notifyDataSetChanged();
}
}
}
如你所见，我真的花了很多时间将整个代码放在一起，但在这个交界处，我的头脑旋转，因为我无法弄清楚为什么
关于方向更改，在我将可过滤引入我的 CustomListAdapter 之后，用于重新填充的listView数据会突然停止填充课程以及
当我清除搜索EditView 时，ListView中的内容不会返回
当我点击重新加载按钮时，列表中的内容不会重新加载，就像设备方向更改时一样。
我真的很感激能帮助我，因为我现在非常困难。
Thanks in Advance
- 已编辑的CustomListAdapter 我所做的更改
@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();
}
}
也编辑了这个。添加了this.originalMovieList = new ArrayList<Movie>(movieItems);
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);
}
将此方法添加到CustomListAdapter
//Add Below Method
public void reloadData(){
this.originalMovieList = new ArrayList<Movie>(movieItems);
notifyDataSetChanged();
}
还使用此
替换了MainActivity Class中的notifyDataSetChanged（） `// notifying list adapter about data changes
// so that it renders the list view with updated data
//adapter.notifyDataSetChanged();
adapter.reloadData();`
-Reload Button现在工作正常，方向更改可以很好地重新加载页面，但搜索不会填充ListView。 因此，搜索尚未开始
答案 0 :(得分：0)
以下是您的问题的答案：
1。 ListView未重新加载？在函数中查看代码后：
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
//filteredData = (ArrayList<String>) results.values;
movieItems = (ArrayList<Movie>) results.values;
notifyDataSetChanged();
}
上述功能使您的适配器无法重新加载。为什么？因为这一行：movieItems = (ArrayList<Movie>) results.values;。您将适配器中的movieItems引用到另一个List，因此movieList.add(movie);中的MainActivity d不再更新adapter中的任何内容。如何克服它？改变如下：
movieItems.clear();
movieItems.addAll((ArrayList<Movie>) results.values);
notifyDataSetChanged();
但是，您的Search功能仍无效。为什么？因为您在performFiltering中尝试搜索movieItems而不是您的备份数据。 - ＆GT;您应该搜索备份数据：originalMovieList，然后通过添加movieItems进行发布。
//change final List<Movie> list = movieItems;
//to belowed line in peformFiltering
final List<String> list = originalData;
为什么你的适配器没有恢复？因为你控制它，但你不会还原它。您应该在peformFiltering函数中恢复它：
protected FilterResults performFiltering(CharSequence constraint) {
String filterString = constraint.toString().toLowerCase();
if(TextUtils.isEmpty(filterString)){
// do restore backup data here
}else{
// do filter here.
}
}
答案 1 :(得分：0)
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) {
if (movie.getTitle().toLowerCase().contains(filterString)) {
currentMovieList.add(movie);
}
else if (String.valueOf(movie.getYear()).toLowerCase().contains(filterString))
{
currentMovieList.add(movie);
}
else if (String.valueOf(movie.getRating()).toLowerCase().contains(filterString))
{
currentMovieList.add(movie);
}
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 那家伙是Android大师。 He made all this happen. -Happy Coding