Java 刷新列表视图项
我的问题是,我在列表视图项上实现了带有filterable的搜索视图。它工作得很好,但是在执行搜索并且Java 刷新列表视图项,java,android,Java,Android,我的问题是,我在列表视图项上实现了带有filterable的搜索视图。它工作得很好,但是在执行搜索并且searchView为空后,我无法获取前面的项目。我尝试了notifydatasetchange,但对我无效。我该怎么办 .... private ListView mListNotes; NoteListAdapter na; protected void onCreate(Bundle savedInstanceState) { super.onCreate(sav
searchView
为空后,我无法获取前面的项目。我尝试了notifydatasetchange
,但对我无效。我该怎么办
....
private ListView mListNotes;
NoteListAdapter na;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mListNotes = (ListView) findViewById(R.id.main_listview);
mListNotes.setTextFilterEnabled(true);
}
@Override
protected void onResume() {
super.onResume();
//load data into the listview and display
mListNotes.setAdapter(na);
}
@Override
public boolean onQueryTextChange(String query) {
if (!query.equals("")) {
na.getFilter().filter(query); // filter listView items when text is inputted.
} else {
na.notifyDataSetChanged(); // what do i put here to refresh my list view after search?
}
return false;
}
}
// ListView Adapter
class NoteListAdapter extends ArrayAdapter<Note> implements Filterable{
List<Note> objects;
private List<Note> mStringFilterList;
Filter filter;
private static final int WRAP_CONTENT_LENGTH = 5;
public NoteListAdapter(Context context, int resource, List<Note> objects) {
super(context, resource, objects);
this.objects = objects;
this.mStringFilterList = objects;
}
@Override
public int getCount() {
return objects.size();
}
@Nullable
@Override
public Note getItem(int position) {
return objects.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public Filter getFilter() {
filter = new Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
ArrayList<Note> tempList= new ArrayList<>();
FilterResults results = new FilterResults();
if (constraint != null && objects != null) {
for(Note singleNote : objects) {
if( singleNote.getTitle().contains(constraint))
tempList.add(singleNote);
}
results.values = tempList;
results.count = tempList.size();
}
return results;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
objects = (ArrayList<Note>) results.values;
notifyDataSetChanged();
}
};
return filter;
}
}
}
。。。。
私有ListView mListNotes;
注:A;
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mListNotes=(ListView)findViewById(R.id.main\u ListView);
mListNotes.setTextFilterEnabled(true);
}
@凌驾
受保护的void onResume(){
super.onResume();
//将数据加载到listview并显示
mListNotes.setAdapter(na);
}
@凌驾
公共布尔onQueryTextChange(字符串查询){
如果(!query.equals(“”){
na.getFilter().filter(查询);//输入文本时过滤listView项。
}否则{
na.notifyDataSetChanged();//在搜索后,我应该在这里放置什么来刷新列表视图?
}
返回false;
}
}
//列表视图适配器
类NoteListAdapter扩展ArrayAdapter实现可筛选{
列出对象;
私有列表mStringFilterList;
过滤器;
私有静态最终整型内容长度=5;
公共NoteListAdapter(上下文、int资源、列表对象){
超级(上下文、资源、对象);
this.objects=对象;
this.mStringFilterList=对象;
}
@凌驾
public int getCount(){
返回objects.size();
}
@可空
@凌驾
公共注释getItem(内部位置){
返回对象。获取(位置);
}
@凌驾
公共长getItemId(int位置){
返回位置;
}
@凌驾
公共过滤器getFilter(){
过滤器=新过滤器(){
@凌驾
受保护的筛选器结果性能筛选(CharSequence约束){
ArrayList tempList=新的ArrayList();
FilterResults results=新的FilterResults();
if(约束!=null&&objects!=null){
对于(注意:单个对象){
if(singleNote.getTitle().contains(constraint))
添加(单音符);
}
results.values=模板列表;
results.count=templast.size();
}
返回结果;
}
@凌驾
受保护的void publishResults(CharSequence约束、FilterResults结果){
objects=(ArrayList)results.values;
notifyDataSetChanged();
}
};
回流过滤器;
}
}
}
您正在用过滤后的数据替换原始数据。使用以下代码:
class NoteListAdapter extends ArrayAdapter<Note> implements Filterable {
List<Note> objects;
private List<Note> originalList = new ArrayList<>();
Filter filter;
private static final int WRAP_CONTENT_LENGTH = 5;
public NoteListAdapter(Context context, int resource, List<Note> objects) {
super(context, resource, objects);
this.objects = objects;
this.originalList.addAll(objects);
}
@Override
public int getCount() {
return objects.size();
}
@Nullable
@Override
public Note getItem(int position) {
return objects.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public Filter getFilter() {
filter = new Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
ArrayList<Note> tempList = new ArrayList<>();
FilterResults results = new FilterResults();
if (objects != null) {
if(constraint != null && !constraint.equals("")) {
for (Note singleNote : objects) {
if (singleNote.getTitle().contains(constraint))
tempList.add(singleNote);
}
results.values = tempList;
results.count = tempList.size();
}else {
tempList.clear();
tempList.addAll(originalList);
results.values = tempList;
results.count = tempList.size();
}
}
return results;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
objects = (ArrayList<Note>) results.values;
notifyDataSetChanged();
}
};
return filter;
}
}
class NoteListAdapter扩展ArrayAdapter实现可过滤{
列出对象;
private List originalList=new ArrayList();
过滤器;
私有静态最终整型内容长度=5;
公共NoteListAdapter(上下文、int资源、列表对象){
超级(上下文、资源、对象);
this.objects=对象;
this.originalList.addAll(对象);
}
@凌驾
public int getCount(){
返回objects.size();
}
@可空
@凌驾
公共注释getItem(内部位置){
返回对象。获取(位置);
}
@凌驾
公共长getItemId(int位置){
返回位置;
}
@凌驾
公共过滤器getFilter(){
过滤器=新过滤器(){
@凌驾
受保护的筛选器结果性能筛选(CharSequence约束){
ArrayList tempList=新的ArrayList();
FilterResults results=新的FilterResults();
如果(对象!=null){
if(constraint!=null&!constraint.equals(“”){
对于(注意:单个对象){
if(singleNote.getTitle().contains(constraint))
添加(单音符);
}
results.values=模板列表;
results.count=templast.size();
}否则{
圣殿骑士;
圣殿骑士阿达尔(原教旨主义者);
results.values=模板列表;
results.count=templast.size();
}
}
返回结果;
}
@凌驾
受保护的void publishResults(CharSequence约束、FilterResults结果){
objects=(ArrayList)results.values;
notifyDataSetChanged();
}
};
回流过滤器;
}
}
希望有帮助:)您正在用过滤后的数据替换原始数据。使用以下代码:
class NoteListAdapter extends ArrayAdapter<Note> implements Filterable {
List<Note> objects;
private List<Note> originalList = new ArrayList<>();
Filter filter;
private static final int WRAP_CONTENT_LENGTH = 5;
public NoteListAdapter(Context context, int resource, List<Note> objects) {
super(context, resource, objects);
this.objects = objects;
this.originalList.addAll(objects);
}
@Override
public int getCount() {
return objects.size();
}
@Nullable
@Override
public Note getItem(int position) {
return objects.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public Filter getFilter() {
filter = new Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
ArrayList<Note> tempList = new ArrayList<>();
FilterResults results = new FilterResults();
if (objects != null) {
if(constraint != null && !constraint.equals("")) {
for (Note singleNote : objects) {
if (singleNote.getTitle().contains(constraint))
tempList.add(singleNote);
}
results.values = tempList;
results.count = tempList.size();
}else {
tempList.clear();
tempList.addAll(originalList);
results.values = tempList;
results.count = tempList.size();
}
}
return results;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
objects = (ArrayList<Note>) results.values;
notifyDataSetChanged();
}
};
return filter;
}
}
class NoteListAdapter扩展ArrayAdapter实现可过滤{
列出对象;
private List originalList=new ArrayList();
过滤器;
私有静态最终整型内容长度=5;
公共NoteListAdapter(上下文、int资源、列表对象){
超级(上下文、资源、对象);
this.objects=对象;
this.originalList.addAll(对象);
}
@凌驾
public int getCount(){
返回objects.size();
}
@可空
@凌驾
公共注释getItem(内部位置){
返回对象。获取(位置);
}
@凌驾
公共长条