baseadapterを使用してリストビューをフィルタリングするにはどうすればよいですか？
リストビューをフィルタリングしようとしていますが、getfilterメソッドが機能していません。
コードは次のとおりです。
@Override
public void afterTextChanged(Editable s) {
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
mHistoryAdapter.getFilter().filter(s);
}
baseadapterにもメソッドを追加しました
public Filter getFilter() {
return null;
}
しかし、それは機能していません..誰かが私を助けることができます.. @ありがとう
MainActivity.Java
public class MainActivity extends Activity {
private ListView mListView;
private CustomAdapter mCustomAdapter;
private EditText mEditText;
private ArrayList<Contacts> _Contacts = new ArrayList<Contacts>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
for (int i = 0; i < 100; i++) {
Contacts contacts = new Contacts();
contacts.setId(""+i);
contacts.setName("Name "+i);
_Contacts.add(contacts);
}
mListView = (ListView) findViewById(R.id.listView1);
mEditText = (EditText) findViewById(R.id.editText1);
mCustomAdapter = new CustomAdapter(MainActivity.this, _Contacts);
mListView.setAdapter(mCustomAdapter);
mEditText.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
mCustomAdapter.getFilter().filter(arg0);
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) {
}
@Override
public void afterTextChanged(Editable arg0) {
}
});
}
}
CustomAdapter.Java
public class CustomAdapter extends BaseAdapter implements Filterable{
private ArrayList<Contacts> _Contacts;
private Activity context;
private LayoutInflater inflater;
private ValueFilter valueFilter;
private ArrayList<Contacts> mStringFilterList;
public CustomAdapter(Activity context, ArrayList<Contacts> _Contacts) {
super();
this.context = context;
this._Contacts = _Contacts;
mStringFilterList = _Contacts;
this.inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
getFilter();
}
@Override
public int getCount() {
return _Contacts.size();
}
@Override
public Object getItem(int position) {
return _Contacts.get(position).getName();
}
@Override
public long getItemId(int position) {
return 0;
}
public class ViewHolder {
TextView tname, tplace;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = inflater.inflate(R.layout.activity_main, null);
holder.tname = (TextView) convertView.findViewById(R.id.textView1);
holder.tplace = (TextView) convertView.findViewById(R.id.textView2);
convertView.setTag(holder);
} else
holder = (ViewHolder) convertView.getTag();
holder.tname.setText("" + _Contacts.get(position).getName());
holder.tplace.setText("" + "" + _Contacts.get(position).getId());
return convertView;
}
@Override
public Filter getFilter() {
if(valueFilter==null) {
valueFilter=new ValueFilter();
}
return valueFilter;
}
private class ValueFilter extends Filter {
//Invoked in a worker thread to filter the data according to the constraint.
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results=new FilterResults();
if(constraint!=null && constraint.length()>0){
ArrayList<Contacts> filterList=new ArrayList<Contacts>();
for(int i=0;i<mStringFilterList.size();i++){
if((mStringFilterList.get(i).getName().toUpperCase())
.contains(constraint.toString().toUpperCase())) {
Contacts contacts = new Contacts();
contacts.setName(mStringFilterList.get(i).getName());
contacts.setId(mStringFilterList.get(i).getId());
filterList.add(contacts);
}
}
results.count=filterList.size();
results.values=filterList;
}else{
results.count=mStringFilterList.size();
results.values=mStringFilterList;
}
return results;
}
//Invoked in the UI thread to publish the filtering results in the user interface.
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint,
FilterResults results) {
_Contacts=(ArrayList<Contacts>) results.values;
notifyDataSetChanged();
}
}
}
Contacts.Java
public class Contacts {
private String name;
private String id;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
}
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:Android="http://schemas.Android.com/apk/res/Android"
Android:layout_width="match_parent"
Android:layout_height="match_parent"
Android:orientation="vertical" >
<EditText
Android:id="@+id/editText1"
Android:layout_width="match_parent"
Android:layout_height="wrap_content"
Android:ems="10" >
<requestFocus />
</EditText>
<ListView
Android:id="@+id/listView1"
Android:layout_width="match_parent"
Android:layout_height="wrap_content" >
</ListView>
activity_main.xml
<LinearLayout xmlns:Android="http://schemas.Android.com/apk/res/Android"
xmlns:tools="http://schemas.Android.com/tools"
Android:layout_width="match_parent"
Android:layout_height="wrap_content"
Android:layout_marginBottom="2dp"
Android:layout_marginLeft="1dp"
Android:layout_marginRight="1dp"
Android:layout_marginTop="2dp"
Android:background="@Android:color/black"
Android:gravity="center_vertical"
Android:paddingBottom="2dp"
Android:paddingTop="2dp"
tools:context=".MainActivity" >
<TextView
Android:id="@+id/textView1"
Android:layout_width="wrap_content"
Android:layout_height="wrap_content"
Android:layout_marginLeft="8dp"
Android:text="Large Text"
Android:textAppearance="?android:attr/textAppearanceLarge"
Android:textColor="@Android:color/white" />
<TextView
Android:id="@+id/textView2"
Android:layout_width="wrap_content"
Android:layout_height="wrap_content"
Android:layout_marginLeft="8dp"
Android:text="Small Text"
Android:textAppearance="?android:attr/textAppearanceSmall"
Android:textColor="@Android:color/white" />
これはサンプルプロジェクトコードです。このコードを使用してくださいこれは本当にあなたを助けます
どうぞ。いくつかのカスタム任意オブジェクトのリストを表示およびフィルタリングする単純なベースアダプター（ビューのリサイクルなし）。この例では、Object.nameはフィルタリングに使用するフィールドです。
1）アクティビティで、（または）ListViewを作成する場所で、テキストフィルタリングを有効にします。
class MyObject {
public String name;
}
List<MyObject> myData = ArrayList<>();
listview.setTextFilterEnabled(true);
2）すでに述べたように、Edittextのtextwatcherで、ListAdapterでフィルターをトリガーします。
public void onTextChanged(CharSequence s, int start, int before, int count) {
listadapter.getFilter().filter(s);
}
3）ベースアダプターで、implement Filterable。そして、データの2つのコピーを保存します。1つはオリジナルで、もう1つはフィルタリングされています。 フィルタリングされていないデータではなく、BaseAdapter全体でフィルタリングされたデータにアクセスしてください
public class FilterableListAdapterExample extends BaseAdapter implements Filterable {
private List<MyObject> mData; //the original data
private List<MyObject> mDataFiltered;//the filtered data
private LayoutInflater mLayoutInflater;
public FilterableListAdapterExample(Context context, List<MyObject> data) {
mData = data;
mDataFiltered=data;
mLayoutInflater = LayoutInflater.from(context);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
convertView= mLayoutInflater.inflate(R.layout.listview_item, null);
TextView textview=(TextView)convertView.findViewById(R.id.listitem_textview);
//note: we access mDataFiltered, not mData
textview.setText(mDataFiltered.get(position).name);
return convertView;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public int getCount() {
return mDataFiltered.size();
}
@Override
public Filter getFilter() {
return new Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults();
if (constraint == null || constraint.length() == 0) {
//no constraint given, just return all the data. (no search)
results.count = mData.size();
results.values = mData;
} else {//do the search
List<MyObject> resultsData = new ArrayList<>();
String searchStr = constraint.toString().toUpperCase();
for (MyObject o : mData)
if (o.name.toUpperCase().startsWith(searchStr)) resultsData.add(o);
results.count = resultsData.size();
results.values = resultsData;
}
return results;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
mDataFiltered = (ArrayList<MyObject>) results.values;
notifyDataSetChanged();
}
};
}
}
次のコードを試してみてください。
public class MainActivity extends ListActivity
{
private List<String> list = new ArrayList<String>();
List<String> mOriginalValues;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final MyAdapter adapter = new MyAdapter(this, getModel());
setListAdapter(adapter);
EditText filterEditText = (EditText) findViewById(R.id.filterText);
// Add Text Change Listener to EditText
filterEditText.addTextChangedListener(new TextWatcher()
{
@Override
public void onTextChanged(CharSequence s, int start, int before, int count)
{
// Call back the Adapter with current character to Filter
adapter.getFilter().filter(s.toString());
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,int after)
{
}
@Override
public void afterTextChanged(Editable s)
{
}
});
}
private List<String> getModel() {
list.add("Linux");
list.add("Windows7");
list.add("Suse");
list.add("Eclipse");
list.add("Ubuntu");
list.add("Solaris");
list.add("Android");
list.add("iPhone");
list.add("Windows XP");
return list;
}
// Adapter Class
public class MyAdapter extends BaseAdapter implements Filterable
{
List<String> arrayList;
List<String> mOriginalValues; // Original Values
LayoutInflater inflater;
public MyAdapter(Context context, List<String> arrayList)
{
this.arrayList = arrayList;
inflater = LayoutInflater.from(context);
}
@Override
public int getCount()
{
return arrayList.size();
}
@Override
public Object getItem(int position)
{
return position;
}
@Override
public long getItemId(int position)
{
return position;
}
private class ViewHolder
{
TextView textView;
}
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
ViewHolder holder = null;
if (convertView == null)
{
holder = new ViewHolder();
convertView = inflater.inflate(R.layout.row, null);
holder.textView = (TextView) convertView
.findViewById(R.id.listTxt);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.textView.setText(arrayList.get(position));
return convertView;
}
@Override
public Filter getFilter()
{
Filter filter = new Filter()
{
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint,FilterResults results)
{
arrayList = (List<String>) results.values; // has the filtered values
notifyDataSetChanged(); // notifies the data with new filtered values
}
@Override
protected FilterResults performFiltering(CharSequence constraint)
{
FilterResults results = new FilterResults(); // Holds the results of a filtering operation in values
List<String> FilteredArrList = new ArrayList<String>();
if (mOriginalValues == null)
{
System.out.println("");
mOriginalValues = new ArrayList<String>(arrayList); // saves the original data in mOriginalValues
}
/********
*
* If constraint(CharSequence that is received) is null returns the mOriginalValues(Original) values
* else does the Filtering and returns FilteredArrList(Filtered)
*
********/
if (constraint == null || constraint.length() == 0)
{
// set the Original result to return
results.count = mOriginalValues.size();
results.values = mOriginalValues;
}
else
{
constraint = constraint.toString().toLowerCase();
for (int i = 0; i < mOriginalValues.size(); i++)
{
String data = mOriginalValues.get(i);
if (data.toLowerCase().startsWith(constraint.toString()))
{
FilteredArrList.add(data);
}
}
// set the Filtered result to return
results.count = FilteredArrList.size();
results.values = FilteredArrList;
}
return results;
}
};
return filter;
}
}
}
ここではgetfilter（）メソッドは必要ないと思います
ArrayList<YourDataModel> data;
.
.
.
Collections.sort(data, new Comparator<YourDataModel>() {
@Override
public int compare(YourDataModel data1, YourDataModel data2) {
if( data1.getDistance() < data2.getDistance() )
return 1;
else
return 0;
}
});
.
.
.
ListView lvData = (ListView) findViewById(R.id.listview1);
MyCustomAdapter adapter = new MyCustomAdapter(this, R.layout.listview_item_row, data);
lvData.setAdapter(adapter);
更新するときはいつでもnotifydatachangeメソッドを使用します