使用过滤器做一个列表视图搜索 [英] use filter to do a listview search
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问题描述
我试图使用过滤器做了一个列表视图搜索，但我得到的错误FilterResults不能被解析为一个类型，而如果我添加
进口android.widget.Filter;
进口android.widget.Filter.FilterResults;开头，出现另一个错误类型android.widget.Filter.FilterResults不可见，还真不知道如何解决。
这里是我的recipeadapter：
I'm trying to use filter to do a listview search, but I get the error "FilterResults cannot be resolved to a type", and if I add "import android.widget.Filter; import android.widget.Filter.FilterResults;" at the beginning, another error appears "The type android.widget.Filter.FilterResults is not visible", really don't know how to fix. here is my recipeadapter:
class RecipesAdapter extends ArrayAdapter<Recipe> implements Filterable{
LayoutInflater inflater;
ArrayList<Recipe> arraylist;
public RecipesAdapter(Context context, ArrayList<Recipe> arraylist) {
super(context, R.layout.row_recipe, recipes);
this.arraylist = arraylist;
inflater = LayoutInflater.from(context);
}
public View getView(final int position, View convertView, ViewGroup parent) {
View itemView = convertView;
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if(itemView == null) {
itemView = inflater.inflate(R.layout.row_recipe, parent, false);
}
final Recipe currentEvent = recipes.get(position);
TextView recipeName = (TextView) itemView.findViewById(R.id.recipename);
recipeName.setText(currentEvent.name);
TextView time = (TextView) itemView.findViewById(R.id.timeContent);
time.setText(currentEvent.created_at);
return itemView;
}
@Override
public int getCount() {
return super.getCount();
}
}
@Override
public Filter getFilter() {
Filter filter = new Filter() {
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint,FilterResults results) {
recipes = (ArrayList<Recipe>) results.values; // has the filtered values
notifyDataSetChanged(); // notifies the data with new filtered values
}
private void notifyDataSetChanged() {
// TODO Auto-generated method stub
}
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults(); // Holds the results of a filtering operation in values
ArrayList<Recipe> FilteredArrList = new ArrayList<Recipe>();
if (recipes == null) {
recipes = new ArrayList<Recipe>(); // 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 = recipes.size();
results.values = recipes;
} else {
constraint = constraint.toString().toLowerCase();
for (int i = 0; i < recipes.size(); i++) {
Recipe data = recipes.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;
}
@Override
public boolean onLoadClass(Class clazz) {
// TODO Auto-generated method stub
return false;
}
};
return filter;
}
ArrayList的食谱已经宣告出局侧Recipesadapter。
the ArrayList recipes has been declared out side the Recipesadapter.
推荐答案
我做到了没有手动在一个非常简单的方法使用过滤器，而无需使用任何额外的点击，只需键入在编辑文本和结果列表视图。根据键入的字符列表视图元素更改/在编辑文本中删除：
I did it manually without using filter in a very easy way without using any extra click, just type in edit text and results are in the list view. List view elements changes according to the characters typed/removed in the edit text:
MainActivity.java
MainActivity.java
package com.example.examplesearch;
import java.util.ArrayList;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.text.Editable;
import android.text.TextWatcher;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
public class MainActivity extends ActionBarActivity {
ArrayAdapter<String> adapter1 = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final ListView list1 = (ListView) findViewById(R.id.list1);
final EditText search = (EditText) findViewById(R.id.search);
final ArrayList<String> arraylist = new ArrayList<String>();
arraylist.add("Balvier");
arraylist.add("Sudhier");
arraylist.add("Abhinay");
arraylist.add("Amit");
arraylist.add("Dilip");
final ArrayList<String> newArraylist = new ArrayList<String>();
final ArrayAdapter<String> adapter = new ArrayAdapter<String>(
getApplicationContext(),
android.R.layout.simple_dropdown_item_1line, arraylist);
newArraylist.clear();
list1.setAdapter(adapter);
search.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before,
int count) {
// TODO Auto-generated method stub
newArraylist.clear();
for (int i = 0; i < arraylist.size(); i++) {
if (search.getText().length() <= arraylist.get(i).length()) {
if (search
.getText()
.toString()
.equalsIgnoreCase(
(String) arraylist.get(i).subSequence(
0, search.getText().length()))) {
newArraylist.add(arraylist.get(i).toString());
}
}
}
adapter1 = new ArrayAdapter<String>(getApplicationContext(),
android.R.layout.simple_dropdown_item_1line,
newArraylist);
list1.setAdapter(adapter1);
}
@Override
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
});
}
}
activity_main.xml中
activity_main.xml
<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.examplesearch.MainActivity" >
<EditText
android:id="@+id/search"
android:layout_width="match_parent"
android:layout_height="50dp" />
<ListView
android:id="@+id/list1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#000000"
android:layout_below="@+id/search"/>
</RelativeLayout>
这篇关于使用过滤器做一个列表视图搜索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IT屋！
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