adapter 回调处理数据

淩亂°似流年 2022-08-27 09:53 59阅读 0赞

测试，   在Adapter中点击按钮， 然后回调到Activity中， 进行数据处理。

package com.maizi.stu;
    
    import java.util.ArrayList;
    
    import android.content.Context;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.view.ViewGroup;
    import android.widget.BaseAdapter;
    import android.widget.Button;
    import android.widget.TextView;
    
    import com.maizi.activity.R;
    import com.maizi.stu.MainActivity.RefulshStateListenter;
    
    public class UserAdapter extends BaseAdapter{
    
    	private ArrayList<User> userList;
    	private Context contex;
    	private LayoutInflater inflater;
    	private RefulshStateListenter  refulshLister;
    	 
    	public UserAdapter(ArrayList<User> userList, Context contex,RefulshStateListenter refulshLister) {
    		super();
    		this.userList = userList;
    		this.contex = contex;
    		this.inflater = LayoutInflater.from(contex);
    		this.refulshLister = refulshLister;
    	}
    
    	@Override
    	public int getCount() {
    		 
    		return userList.size();
    	}
    
    	@Override
    	public Object getItem(int arg0) {
    		 
    		return userList.get(arg0);
    	}
    
    	@Override
    	public long getItemId(int position) {
    		 
    		return position;
    	}
    
    	@Override
    	public View getView(final int position, View convertView, ViewGroup parent) {
    		ViewHolder viewHolder = null;
    		if(convertView == null){
    			convertView = inflater.inflate(R.layout.item, null);
    			viewHolder = new ViewHolder();
    			viewHolder.textView = (TextView) convertView.findViewById(R.id.tv_name);
    			viewHolder.btn = (Button) convertView.findViewById(R.id.btn_change_name);
    			convertView.setTag(viewHolder);
    		}else{
    			viewHolder = (ViewHolder) convertView.getTag();
    		}
    		
    		viewHolder.textView.setText(userList.get(position).getName());
    		viewHolder.btn.setOnClickListener(new OnClickListener() {
    			
    			@Override
    			public void onClick(View v) {
    				 
    				refulshLister.refush(userList.get(position).getId());
    			}
    		});
    		return convertView;
    	}
    
    	static class ViewHolder{
    		private  TextView textView;
    		private  Button btn;
    		
    	}
    	
    	
    }

Activity代码

package com.maizi.stu;
    
    import java.util.ArrayList;
    import java.util.Iterator;
    
    import android.app.Activity;
    import android.os.Bundle;
    import android.widget.ListView;
    import android.widget.Toast;
    
    import com.maizi.activity.R;
    
    public class MainActivity extends Activity{
    	
    	private ListView  listView;
    	private UserAdapter adapter;
    	private ArrayList<User> userList;
    	private User user;
    	 
    	@Override
    	protected void onCreate(Bundle savedInstanceState) {
    		super.onCreate(savedInstanceState);
    		setContentView(R.layout.main);
    		userList = new ArrayList<User>();
    		for (int i = 0; i < 10; i++) {
    			user = new User();
    			user.setId(i);
    			user.setName("名字-->"+i);
    			userList.add(user);
    		}
    		refulshLister = new RefulshStateListenter() {
    			
    			@Override
    			public void refush(int id) {
    				 
    				Toast.makeText(MainActivity.this, "--学生---"+id, Toast.LENGTH_LONG).show();
    				
    			}
    		};
    		
    		listView = (ListView) findViewById(R.id.lv_test);
    		adapter = new UserAdapter(userList, this,refulshLister);
    		listView.setAdapter(adapter);
    	 
    		
    	}
    	
    	private  RefulshStateListenter  refulshLister;
    	 
    	public RefulshStateListenter getRefulshLister() {
    		return refulshLister;
    	}
     
    	public void setRefulshLister(RefulshStateListenter refulshLister) {
    		this.refulshLister = refulshLister;
    	}
    	
    	public interface RefulshStateListenter{
    		
    		public  void  refush(int id);
    		
    	}
    	
    	
    
    }