本文介绍了自定义用getFilter自定义ArrayAdapter的机器人的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有自定义arrayAdapter实现自定义用getFilter麻烦。其实我不知道如何实现它。试过各种codeS，但仍然没有运气。这里是我的自定义阵列适配器。
I am having trouble implementing custom getFilter in custom arrayAdapter. Actually I have no idea how to implement it. Tried various codes but still no luck. Here is my custom array adapter.
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;
}
}
和这里的列表以类。
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;
}
}
和这里的布局。
<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>
下面的搜索关键字来自inputSearch的EditText。
Here the search keyword comes from "inputSearch" EditText.
下面的文本改变了听众。
Here's the text changed listener.
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
}
});
感谢。
推荐答案
您是有问题的，主要是因为使用的是自定义对象。如果你传递一个String或int值阵列适配器它知道如何过滤。但是，如果你通过自定义对象的默认筛选器的实现必须不知道如何面对这一切。
You are having problem, mainly because you are using custom object. If you pass a String or int value to array adapter its know how to filter it. But if you pass custom object default filter implementation have to no idea how to deal with that.
尽管目前尚不清楚你想要做你的过滤器是我建议你下面的步骤。
Although it is not clear what you are trying to do in your filter i recommend you following steps.
- 正确实施
列表以，虽然它无关，与你的目标，现在 - 在实现自定义过滤器
- 在返回过滤器
- Proper implementation of
ListTO, although it has nothing to do with your goal right now - Implement custom filter
- return your filter
实现自定义过滤器
首先你需要做的是，工具 可筛选从你的阵列适配器。
First thing you have to do is, implements Filterable from your array adapter.
二，提供了实施的过滤器
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;
}
这篇关于自定义用getFilter自定义ArrayAdapter的机器人的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！