Android搜索筛选自定义列表 [英] Android Search Filter for custom lists

问题描述

我已经通过了许多关于如何创建搜索过滤器的教程，但是我不能让它们中的任何一个工作。我觉得通常遇到一个问题，因为我发现许多教程使用字符串，但我使用我的自定义类。如何为自定义类和适配器创建搜索过滤器？

这是我的 MainActivity 代码

  package com.example.android.college3; 
 
导入android.content.Intent; 
导入android.os.Bundle; 
导入android.support.v7.app.AppCompatActivity; 
导入android.view.View; 
导入android.widget.AdapterView; 
导入android.widget.ListView; 
 
 import java.util.ArrayList; 
 $ b $ public class MainActivity extends AppCompatActivity {
 
 @Override 
 protected void onCreate（Bundle savedInstanceState）{
 super.onCreate（savedInstanceState）; 
 setContentView（R.layout.activity_main）; 
 
 
 // College列表视图创建者
 
 
 
最后ArrayList< College> students = new ArrayList<>（）; 
 students.add（新学院（布朗大学，R.drawable.brown_logo，College_Info_Brown.class））; 
 students.add（新学院（宾夕法尼亚州立大学，R.drawable.penn_logo，College_Info.class））; 
 students.add（新学院（康奈尔大学，R.drawable.cornell_logo，College_Info.class））; 
 
 College_Adapter collegeAdapter = new College_Adapter（this，colleges）; 
 
最终ListView listView =（ListView）findViewById（R.id.college_list）; 
 listView.setAdapter（collegeAdapter）; 
 
 listView.setOnItemClickListener（new AdapterView.OnItemClickListener（）{
 @Override $ b $ public void onItemClick（AdapterView<> adapterView，View view，int i，long l）{ 
 College college = colleges.get（i）; 
 Intent intent = new Intent（MainActivity.this，college.getCollegeinfo（））; 
 startActivity（intent）; 
} 
}）; 
 
 //搜索
 
 
 
 $ b} 
 
} 
 自定义适配器 
 
   package com.example.android.college3; 
 
导入android.app.Activity; 
导入android.view.LayoutInflater; 
导入android.view.View; 
导入android.view.ViewGroup; 
导入android.widget.ArrayAdapter; 
导入android.widget.ImageView; 
导入android.widget.TextView; 
 
 import java.util.ArrayList; 
 
 public class College_Adapter扩展了ArrayAdapter< College> {
 
 
 
 public College_Adapter（活动环境，ArrayList< College>学院）{
 super（context，0，colleges）; 
 
 $ b $覆盖
 public View getView 
 if（listItemView == null）{
 listItemView = LayoutInflater.from（getContext（））。inflate（R.layout.list_item，parent，false）; 
 
 College currentCollege = getItem（position）; 
 TextView collegeNameTextView =（TextView）listItemView.findViewById（R.id.college_name_text_view）; 
 collegenameTextView.setText（currentCollege.getCollegeName（））; 
 
 ImageView collegeImageView =（ImageView）listItemView.findViewById（R.id.college_image_image_view）; 
 collegeImageView.setImageResource（currentCollege.getImageResourceId（））; 
 
 return listItemView; 
 
 
 
 
 
这是我的自定义类的代码  
 
 
  package com.example.android.college3; 
 
 public class College {
 
 private String mCollegeName; 
 private int mImageResourceId; 
 private Class<？> mCollegeInfo; 
 
 
公立学院（String collegeName，int imageResourceId，Class collegeInfo）{
 mCollegeName = collegeName; 
 mImageResourceId = imageResourceId; 
 mCollegeInfo = collegeInfo; 
} 
 
 public String getCollegeName（）{
 return mCollegeName; 
 
 
 public int getImageResourceId（）{
 return mImageResourceId; 
} 
 
 public Class getCollegeinfo（）{
 return mCollegeInfo; 
 
 
 $ b  
 
 
解决方案
 
 
 
首先，只替换College Name平等的大学课程的equals方法。然后，使用包含或可能的相等方法将其搜索到列表中。将结果保存到临时列表中。 
 
 
将您的临时列表设置为源列表到列表视图。 
 
 
为每个搜寻触发器都做。
 
 
 
I've been through many tutorials on how to create the search filter but I can't get any of them to work. I think usually encounter a problem because many of the tutorials I have found use a String but I use my custom class. How would you make the search filter for a custom class and adapter?

Here's my MainActivity code
package com.example.android.college3;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    //College List View creator



    final ArrayList<College> colleges = new ArrayList<>();
    colleges.add(new College("Brown University", R.drawable.brown_logo, College_Info_Brown.class));
    colleges.add(new College("Pennsylvania State University", R.drawable.penn_logo, College_Info.class));
    colleges.add(new College("Cornell University", R.drawable.cornell_logo, College_Info.class));

    College_Adapter collegeAdapter = new College_Adapter(this, colleges);

    final ListView listView = (ListView) findViewById(R.id.college_list);
    listView.setAdapter(collegeAdapter);

    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
            College college = colleges.get(i);
                Intent intent = new Intent(MainActivity.this, college.getCollegeinfo());
                startActivity(intent);
        }
    });

    //search




    }

}
Here is my custom adapter
package com.example.android.college3;

import android.app.Activity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.ArrayList;

public class College_Adapter extends ArrayAdapter<College> {



public College_Adapter(Activity context, ArrayList<College> colleges){
    super(context, 0 , colleges);
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View listItemView = convertView;
    if (listItemView == null){
        listItemView = LayoutInflater.from(getContext()).inflate(R.layout.list_item, parent, false);
    }
    College currentCollege = getItem(position);
    TextView collegeNameTextView = (TextView) listItemView.findViewById(R.id.college_name_text_view);
    collegeNameTextView.setText(currentCollege.getCollegeName());

    ImageView collegeImageView = (ImageView) listItemView.findViewById(R.id.college_image_image_view);
    collegeImageView.setImageResource(currentCollege.getImageResourceId());

    return listItemView;
          }
     }
This is the code for my custom class
package com.example.android.college3;

public class College {

private String mCollegeName;
private int mImageResourceId;
private Class<?> mCollegeInfo;


public College(String collegeName, int imageResourceId, Class collegeInfo){
    mCollegeName = collegeName;
    mImageResourceId = imageResourceId;
    mCollegeInfo = collegeInfo;
}

public String getCollegeName(){
    return mCollegeName;
}

public int getImageResourceId(){
    return mImageResourceId;
}

public Class getCollegeinfo(){
    return mCollegeInfo;
       }

 }

解决方案

Firstly, overrride your equals method of your College class for only College Name equality. 
Then, search it into the list with contains or likely equality methods. Save the result to a temp list. 
Set your temp list as source list to listview. 
Do it for every search trigger.


                        
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