Red*_*one 37 android android-arrayadapter android-listview
我在自定义arrayAdapter中实现自定义getFilter时遇到问题.实际上我不知道如何实现它.试过各种代码,但仍然没有运气.这是我的自定义数组适配器.
package com.test.FilterableList.Adapters;
import java.util.ArrayList;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import com.test.FilterableList.Models.ListTO;
import com.test.FilterableList.R;
import android.widget.Filterable;
public class FilterableAdapter extends ArrayAdapter<ListTO> implements Filterable {
// declaring our ArrayList of items
public ArrayList<ListTO> objects;
/* here we must override the constructor for ArrayAdapter
* the only variable we care about now is ArrayList<Item> objects,
* because it is the list of objects we want to display.
*/
public FilterableAdapter(Context context, int textViewResourceId, ArrayList<ListTO> objects) {
super(context, textViewResourceId, objects);
this.objects = objects;
}
/*
* we are overriding the getView method here - this is what defines how each
* list item will look.
*/
public View getView(int position, View convertView, ViewGroup parent){
// assign the view we are converting to a local variable
View v = convertView;
// first check to see if the view is null. if so, we have to inflate it.
// to inflate it basically means to render, or show, the view.
if (v == null) {
LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = inflater.inflate(R.layout.list_item, null);
}
/*
* Recall that the variable position is sent in as an argument to this method.
* The variable simply refers to the position of the current object in the list. (The ArrayAdapter
* iterates through the list we sent it)
*
* Therefore, i refers to the current Item object.
*/
ListTO i = objects.get(position);
if (i != null) {
// This is how you obtain a reference to the TextViews.
// These TextViews are created in the XML files we defined.
TextView tt = (TextView) v.findViewById(R.id.list_name);
if (tt != null){
tt.setText(i.FileName);
}
}
// the view must be returned to our activity
return v;
}
}
这是ListTO类.
package com.test.FilterableList.Models;
public class ListTO {
public int Id;
public String FileName;
public String FileUri;
public ListTO(int id, String fileName, String fileUri) {
Id = id;
FileName = fileName;
FileUri = fileUri;
}
}
这是布局.
<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="match_parent"
android:orientation="vertical"
android:background="@drawable/blacklikenbackground"
tools:context=".AllListActivity" >
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Search"
android:id="@+id/inputSearch"
/>
<ListView
android:id="@+id/test_list"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</ListView>
</LinearLayout>
这里的搜索关键字来自"inputSearch"EditText.
这是改变了听众的文字.
inputSearch.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
// When user changed the Text
// Toast.makeText(getActivity(), cs.toString(), Toast.LENGTH_LONG).show();
m_adapter.getFilter().filter(cs);
}
@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
}
});
谢谢.
min*_*haz 45
您遇到问题,主要是因为您使用的是自定义对象.如果将String或int值传递给数组适配器,则知道如何对其进行过滤.但是,如果你传递自定义对象默认过滤器实现不得不知道如何处理.
虽然不清楚您在过滤器中尝试做什么,但我建议您按照以下步骤操作.
ListTO,虽然它与你现在的目标无关实施自定义过滤器
您需要做的第一件事就是implements Filterable从您的阵列适配器.
第二,提供你的实施 Filter
Filter myFilter = new Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults filterResults = new FilterResults();
ArrayList<ListTO> tempList=new ArrayList<ListTO>();
//constraint is the result from text you want to filter against.
//objects is your data set you will filter from
if(constraint != null && objects!=null) {
int length=objects.size();
int i=0;
while(i<length){
ListTO item=objects.get(i);
//do whatever you wanna do here
//adding result set output array
tempList.add(item);
i++;
}
//following two lines is very important
//as publish result can only take FilterResults objects
filterResults.values = tempList;
filterResults.count = tempList.size();
}
return filterResults;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence contraint, FilterResults results) {
objects = (ArrayList<ListTO>) results.values;
if (results.count > 0) {
notifyDataSetChanged();
} else {
notifyDataSetInvalidated();
}
}
};
最后一步,
@Override
public Filter getFilter() {
return myFilter;
}
您需要覆盖getFilter()适配器中的方法并提供自己的过滤器.查看此可过滤示例以查看实际实现.
将以下getFilter()代码添加到您的FilterableAdapter类中并使用您的过滤填充它:
/* (non-Javadoc)
* @see android.widget.ArrayAdapter#getFilter()
*/
@Override
public Filter getFilter() {
return new Filter() {
/* (non-Javadoc)
* @see android.widget.Filter#performFiltering(java.lang.CharSequence)
*/
@Override
protected FilterResults performFiltering(CharSequence constraint) {
// TODO Auto-generated method stub
/*
* Here, you take the constraint and let it run against the array
* You return the result in the object of FilterResults in a form
* you can read later in publichResults.
*/
return null;
}
/* (non-Javadoc)
* @see android.widget.Filter#publishResults(java.lang.CharSequence, android.widget.Filter.FilterResults)
*/
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
// TODO Auto-generated method stub
/*
* Here, you take the result, put it into Adapters array
* and inform about the the change in data.
*/
}
};
}
我在评论中添加了一些提示.
无需编写数组适配器.写一个toString()方法,该方法应该返回filename的值.
喜欢
public class ListTO {
public int Id;
public String FileName;
public String FileUri;
public ListTO(int id, String fileName, String fileUri) {
Id = id;
FileName = fileName;
FileUri = fileUri;
}
public String toString(){
return FileName
}
}
试试这个:
public class Adptr extends BaseAdapter implements Filterable {
public ArrayList<Model> modelValues;
private Activity activity;
private LayoutInflater layoutinflater;
private List<Model> mOriginalValues;
private int PositionSelected = 0;
public Adptr (ArrayList<Model> modelValues, Activity activity) {
super();
this.modelValues = modelValues;
this.activity = activity;
}
@Override
public int getCount() {
return modelValues.size();
}
@Override
public Object getItem(int position) {
return modelValues.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
layoutinflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
ViewHolder holder = null;
Model model = modelValues.get(position);
if (convertView == null || !(convertView.getTag() instanceof ViewHolder)) {
convertView = layoutinflater.inflate(R.layout.row_search, null);
holder = new ViewHolder();
holder.txtName = (TextView) convertView.findViewById(R.id.row_serch_txt_name);
convertView.setTag(holder);
convertView.setTag(R.id.row_serch_txt_name, holder.txtName);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.txtArtistName.setText("" + modelValue.get_NAME());
return convertView;
}
class ViewHolder {
TextView txtName;
}
@Override
public Filter getFilter() {
Filter filter = new Filter() {
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
modelValues = (ArrayList<ModelValueArtist>) results.values; // has
notifyDataSetChanged();
}
@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>();
List<Model> FilteredArrList = new ArrayList<Model>();
if (mOriginalValues == null) {
mOriginalValues = new ArrayList<Model>(modelValues); // saves
}
/********
*
* 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 {
Locale locale = Locale.getDefault();
constraint = constraint.toString().toLowerCase(locale);
for (int i = 0; i < mOriginalValues.size(); i++) {
Model model = mOriginalValues.get(i);
String data = model.get_NAME();
if (data.toLowerCase(locale).contains(constraint.toString())) {
FilteredArrList.add(modelMyMall);
}
}
// set the Filtered result to return
results.count = FilteredArrList.size();
results.values = FilteredArrList;
}
return results;
}
};
return filter;
}
}