我正在尝试在基本适配器上实现getfilter(),以筛选出列表中的搜索结果。有没有实现getfilter()的例子?
main活动.java
final AppInfoAdapter adapter = new AppInfoAdapter(this, Utilities.getSystemFilteredApplication(this), getPackageManager());
public void onTextChanged(CharSequence s, int start, int before,
int count) {
adapter.getFilter().filter(s); //Filter from my adapter
adapter.notifyDataSetChanged(); //Update my view
}
appinfoadapter.java
package com.example.permission;
import java.util.List;
import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.ImageView;
import android.widget.TextView;
public class AppInfoAdapter extends BaseAdapter implements Filterable{
private Context mContext;
private List mListAppInfo;
PackageManager mPackManager;
public AppInfoAdapter(Context c, List list, PackageManager pm) {
mContext = c;
mListAppInfo = list;
mPackManager = pm;
}
public int getCount() {
return mListAppInfo.size();
}
public Object getItem(int position) {
return mListAppInfo.get(position);
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
// get the selected entry
ApplicationInfo entry = (ApplicationInfo) mListAppInfo.get(position);
// reference to convertView
View v = convertView;
// inflate new layout if null
if(v == null) {
LayoutInflater inflater = LayoutInflater.from(mContext);
v = inflater.inflate(R.layout.layout_appinfo, null);
}
// load controls from layout resources
ImageView ivAppIcon = (ImageView)v.findViewById(R.id.ivIcon);
TextView tvAppName = (TextView)v.findViewById(R.id.tvName);
TextView tvPkgName = (TextView)v.findViewById(R.id.tvPack);
// set data to display
ivAppIcon.setImageDrawable(entry.loadIcon(mPackManager));
tvAppName.setText(entry.loadLabel(mPackManager));
tvPkgName.setText(entry.packageName);
// return view
return v;
}
public Filter getFilter() {
// TODO Auto-generated method stub
return null;
}
}
编辑:编辑代码并添加完整的appinfoadapter.java
最佳答案
在适配器中,将这个类用于getfilter方法
//this is a simple class that filtering the ArrayList of strings used in adapter
public class filter_here extends Filter{
@Override
protected FilterResults performFiltering(CharSequence constraint) {
// TODO Auto-generated method stub
FilterResults Result = new FilterResults();
// if constraint is empty return the original names
if(constraint.length() == 0 ){
Result.values = Original_Names;
Result.count = Original_Names.size();
return Result;
}
ArrayList<String> Filtered_Names = new ArrayList<String>();
String filterString = constraint.toString().toLowerCase();
String filterableString;
for(int i = 0; i<Original_Names.size(); i++){
filterableString = Original_Names.get(i);
if(filterableString.toLowerCase().contains(filterString)){
Filtered_Names.add(filterableString);
}
}
Result.values = Filtered_Names;
Result.count = Filtered_Names.size();
return Result;
}
@Override
protected void publishResults(CharSequence constraint,FilterResults results) {
// TODO Auto-generated method stub
Names = (ArrayList<String>) results.values;
notifyDataSetChanged();
}
}
在getfilter中从中返回实例
@Override
public Filter getFilter() {
// TODO Auto-generated method stub
return filter;
}
full example