重写ArrayAdapter

最新推荐文章于 2018-08-29 14:32:07 发布

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最新推荐文章于 2018-08-29 14:32:07 发布

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原文链接：https://my.oschina.net/linuxyangzhiyong/blog/54745

本文介绍了一个具体的Android应用程序中自定义适配器的实现案例，该适配器用于展示图书信息，包括名称、图标、描述、出版社及价格等。通过创建一个继承自ArrayAdapter的IAdapter类，并重写getView方法来实现对ListView中每一项的定制化显示。

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package org.yang.android.adapter.util;



import org.yang.android.adapter.demo.R;
import org.yang.android.adapter.model.Book;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

public class IAdapter extends ArrayAdapter<Object> {
	
	private int resources;
	private LayoutInflater inflater;
	
	public IAdapter(Context context, int resources, Book[] books)
	{
		super(context, resources, books);
		this.resources = resources;
		this.inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
	}
	
	public View getView(int position, View convertView, ViewGroup parent) {
		convertView = inflater.inflate(resources, null);
        
        Book bi = (Book) this.getItem(position);
        if (bi == null) {
            return null;
        }
        
        TextView nameView = (TextView)convertView.findViewById(R.id.bname);
        nameView.setText(bi.getName());
        
        ImageView bicon = (ImageView)convertView.findViewById(R.id.bimage);
        bicon.setBackgroundDrawable(bi.getIcon());
        
        TextView bdescView = (TextView)convertView.findViewById(R.id.bdesc);
        bdescView.setText(bi.getDesc());
        
        TextView bpress = (TextView)convertView.findViewById(R.id.bpress);
        bpress.setText(bi.getPress());
        
        TextView bprices = (TextView)convertView.findViewById(R.id.bprices);
        bprices.setText(bi.getPrices());
        
		return convertView;
	}
}

package org.yang.android.adapter.demo;

import org.yang.android.adapter.model.Book;
import org.yang.android.adapter.util.IAdapter;

import android.app.Activity;
import android.content.res.AssetManager;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.util.Log;
import android.widget.ListView;

public class AdapterDemoActivity extends Activity {
    /** Called when the activity is first created. */
	ListView lv;
	Book[] books = new Book[5];
	
	AssetManager assets;
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        lv = (ListView)this.findViewById(R.id.lv);
        
        assets = this.getAssets();
        try {
			books[0] = new Book("linux", Drawable.createFromStream(assets.open("linux.jpg"), null), "desc", "人民", "36.6");
			
			books[1] = new Book("linux", Drawable.createFromStream(assets.open("linux.jpg"), null), "desc", "人民", "36.6");
			
			books[2] = new Book("linux", Drawable.createFromStream(assets.open("linux.jpg"), null), "desc", "人民", "36.6");
			
			books[3] = new Book("linux", Drawable.createFromStream(assets.open("linux.jpg"), null), "desc", "人民", "36.6");
			
			books[4] = new Book("linux", Drawable.createFromStream(assets.open("linux.jpg"), null), "desc", "人民", "36.6");
		} catch (Exception e) {
			// TODO: handle exception
			Log.d("app 读到文件出错!", e.toString());
		}
		IAdapter adapter = new IAdapter(this, R.layout.book, books);
		lv.setAdapter(adapter);
    }
}

转载于:https://my.oschina.net/linuxyangzhiyong/blog/54745