我有一个Android应用程序，我有一个自定义适配器。我想过滤我的数据但是当我清除编辑文本时，我的列表变成空白。
我希望在清除编辑文本时显示原始列表视图。我认为我的原始列表也在某些代码中被清除，但我不明白在哪里。
public class Adapter_SelectedDetail extends ArrayAdapter<DataModel> implements Filterable {
private final Context context;
ArrayList<DataModel> MyList=null,newList=null;
private MyFilter filter;
DataModel dataModel;
EditText Mysearch;
ListView listView;
String searchdata;
private static LayoutInflater inflater=null;
public Adapter_SelectedDetail(Context context, EditText search, ArrayList MyList1, ListView listView) {
super(context, -1, MyList1);
this.newList = new ArrayList<DataModel>();
this.newList.addAll(newList);
this.Mysearch=search;
this.listView=listView;
this.MyList = new ArrayList<DataModel>();
this.MyList.addAll(newList);
this.MyList=MyList1;
this.context=context;
}
@Override
public Filter getFilter() {
if (filter == null){
filter = new MyFilter();
}
return filter;
}
@Override
public View getView(final int position, View ConverView, ViewGroup parent) {
inflater = ( LayoutInflater )context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
// DataModel dataModel = (DataModel) getItem(position);
View rowView = ConverView;
// TODO Auto-generated method stub
TextView CompanyName,CompanyMobile,Bill_no,Bill_date,PartyName,Transport,City,
State,CustomerMobileNumber,AgentName,LRno,LRdate,Item,Shades,
AgentMobileNumber,InvoicePDF,PartyEmail,agentEmail;
if (rowView==null) {
rowView = inflater.inflate(R.layout.selected_detail_list_view, parent,false);
}
dataModel=MyList.get(position);
if (dataModel!=null) {
CompanyName = (TextView) rowView.findViewById(R.id.txt_heading_of_detail);
CompanyMobile = (TextView) rowView.findViewById(R.id.txt_subheading_of_detail);
Bill_no = (TextView) rowView.findViewById(R.id.txt_bill_no);
Bill_date = (TextView) rowView.findViewById(R.id.txt_bill_date);
PartyName = (TextView) rowView.findViewById(R.id.txt_party_name);
Transport = (TextView) rowView.findViewById(R.id.txt_transport);
City = (TextView) rowView.findViewById(R.id.txt_city);
State = (TextView) rowView.findViewById(R.id.txt_state);
Shades = (TextView) rowView.findViewById(R.id.txt_shades);
CustomerMobileNumber = (TextView) rowView.findViewById(R.id.txt_customer_mob_no);
AgentName = (TextView) rowView.findViewById(R.id.txt_agent);
AgentMobileNumber = (TextView) rowView.findViewById(R.id.txt_agent_mob_number);
LRdate = (TextView) rowView.findViewById(R.id.txt_lr_date);
LRno = (TextView) rowView.findViewById(R.id.txt_lr_number);
Item = (TextView) rowView.findViewById(R.id.txt_item);
agentEmail = (TextView) rowView.findViewById(R.id.txt_agent_Email);
PartyEmail = (TextView) rowView.findViewById(R.id.txt_party_email);
// Toast.makeText(context, MyList1.get(2).toString(), Toast.LENGTH_SHORT).show();
CompanyMobile.setText(dataModel.getCompanyMobile());
City.setText(dataModel.getCity());
State.setText(dataModel.getState());
CompanyName.setText(dataModel.getCompanyName());
Bill_no.setText(dataModel.getBill_no());
PartyName.setText(dataModel.getPartyName());
Transport.setText(dataModel.getTransport());
Shades.setText(dataModel.getShades());
CustomerMobileNumber.setText(dataModel.getCustomerMobileNumber());
AgentName.setText(dataModel.getAgentName());
AgentMobileNumber.setText(dataModel.getAgentMobileNumber());
LRdate.setText(dataModel.getLRdate());
LRno.setText(dataModel.getLRno());
Item.setText(dataModel.getItem());
agentEmail.setText(dataModel.getAgentEmail());
PartyEmail.setText(dataModel.getPartyEmail());
}
return rowView;
}
public class MyFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
constraint = constraint.toString().toLowerCase();
FilterResults result = new FilterResults();
if(constraint != null && constraint.toString().length() > 0)
{
ArrayList<DataModel> filteredItems = new ArrayList<DataModel>();
for(int i = 0, l = MyList.size(); i < l; i++)
{
DataModel dataModel = MyList.get(i);
if(dataModel.getShades().toString().toLowerCase().contains(constraint))
filteredItems.add(dataModel);
}
result.count = filteredItems.size();
result.values = filteredItems;
}
else
{
synchronized(this)
{
result.values = MyList;
result.count = MyList.size();
}
}
return result;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint,
FilterResults results) {
newList = (ArrayList<DataModel>)results.values;
notifyDataSetChanged();
clear();
for (int i = 0, l = newList.size(); i < l; i++)
add(newList.get(i));
notifyDataSetInvalidated();
}
}
}
public class Selected_Detail_Activity extends Activity {
@BindView(R.id.select_listview)
ListView selected_list;
@BindView(R.id.search)
EditText search;
String item, mobile, pass, partyName;
ArrayList<DataModel> MyList1;
Context context;
DataModel dataModel=new DataModel();
@BindView(R.id.txt_party_name)
TextView txtparty_Name;
ConnectionClass connectionClass;
Adapter_SelectedDetail adapter;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.selected_detail);
ButterKnife.bind(this);
item = getIntent().getStringExtra("item");
mobile = getIntent().getStringExtra("mobile");
pass = getIntent().getStringExtra("pass");
partyName = getIntent().getStringExtra("partyName");
txtparty_Name.setText(partyName);
connectionClass = new ConnectionClass();
context=this;
selected_list.setAdapter(adapter);
try {
Connection con = connectionClass.CONN();
if (con == null) {
} else {
PreparedStatement statement = con.prepareStatement("EXEC " + pass + " " + item + " , " + mobile + "");
MyList1 = new ArrayList<DataModel>();
ResultSet rs = statement.executeQuery();
while (rs.next()) {
dataModel.setBill_date(rs.getString("bill_date"));
dataModel.setCompanyMobile(rs.getString("CompanyMobile"));
dataModel.setCity(rs.getString("city"));
dataModel.setState(rs.getString("state"));
dataModel.setShades(rs.getString("Shades"));
dataModel.setAgentMobileNumber(rs.getString("agentMobNumber"));
MyList1.add(dataModel);
dataModel=new DataModel();
adapter=new Adapter_SelectedDetail(this,search,MyList1,selected_list);
selected_list.setAdapter(adapter);
search.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) {
}
@Override
public void afterTextChanged(Editable s) {
Selected_Detail_Activity.this.adapter.getFilter().filter(s.toString());
}
});
}
}
}
catch (Exception e) {
Log.e("123", "error", e);
}
}
}
答案 0 :(得分：0)
您滥用数据集。即，您已删除所有原始数据。
首先，您尚未设置备份数据，请将适配器构造函数替换为此。
public Adapter_SelectedDetail(Context context, EditText search, ArrayList MyList1, ListView listView) {
super(context,-1);
this.newList = new ArrayList<>();
this.newList.addAll(MyList1);
this.Mysearch = search;
this.listView = listView;
this.MyList = new ArrayList<>();
this.MyList.addAll(MyList1);
this.context = context;
}
并向您的适配器添加覆盖函数getCount。
@Override
public int getCount() {
return MyList.size();
}
然后，
......
@Override
protected FilterResults performFiltering(CharSequence constraint) {
constraint = constraint.toString().toLowerCase();
FilterResults result = new FilterResults();
if(constraint != null && constraint.toString().length() > 0)
{
ArrayList<DataModel> filteredItems = new ArrayList<DataModel>();
for(int i = 0, l = newList.size(); i < l; i++)
{
DataModel dataModel = newList.get(i);
if(dataModel.getShades().toString().toLowerCase().contains(constraint))
filteredItems.add(dataModel);
}
result.count = filteredItems.size();
result.values = filteredItems;
}else
{
synchronized(this)
{
result.values = newList;
result.count = newList.size();
}
}
return result;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint,
FilterResults results) {
MyList= (ArrayList<DataModel>)results.values;
notifyDataSetChanged();
}
.....
然后它工作正常， 祝你好运。