适配器的应用

最新推荐文章于 2025-04-16 23:03:58 发布

原创最新推荐文章于 2025-04-16 23:03:58 发布 · 342 阅读

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本文介绍了一个简单的 Android 应用示例，使用 ListView 显示一组水果名称和对应的图标。通过创建自定义适配器 SimpleAdapter 实现数据绑定，并展示了如何初始化数据源及设置布局。

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布局文件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=".MainActivity" >

</ListView>

</RelativeLayout>

MainActivity.java

package cn.edu.bzu.androidboke;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import cn.edu.bzu.adapter.FruitAdapter;
import cn.edu.bzu.fruits.Fruits;
import cn.edu.bzu.adapter.*;

public class MainActivity extends Activity {

//@Override准备数据的操作
/*创建适配器绑定数据与图片之间的关联fruitName和fruiticon*/
private ListView lvfruits;
private List<Fruits> fruitList=new ArrayList<Fruits>();
List<Map<String,Object>> data=new ArrayList<Map<String,Object>>();
private String[]fruitName={"Apple", "Banana", "Orange", "Watermelon",
   "Pear", "Grape", "Pineapple", "Strawberry", "Cherry", "Mango" };
private int[]fruitIcon={R.drawable.apple_pic,R.drawable.banana_pic,R.drawable.cherry_pic,R.drawable.grape_pic,R.drawable.mango_pic,R.drawable.orange_pic,R.drawable.pear_pic,
   R.drawable.pineapple_pic,R.drawable.strawberry_pic,R.drawable.watermelon_pic};

protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  //调用方法准备数据
  initFruits();
  //查找组建
  lvfruits=(ListView) findViewById(R.id.lvfruits);
  //创建adapter
  //绑定AdapterView与Adapter之间的关联
  SimpleAdapter simpleadapter=new SimpleAdapter(this, data,R.layout.fruit_item, new String[]{"fruitName","fruitIcon"}, new int[]{R.id.tvfruit,R.id.ivfruit});
  lvfruits.setAdapter(simpleadapter);

}

private void initFruits() {
  // TODO Auto-generated method stub
  for(int i=0;i<fruitName.length;i++){
   Map<String,Object> item=new HashMap<String,Object>();
   item.put("fruitIcon",fruitIcon[i] );
   item.put("fruitName", fruitName[i]);
   data.add(item);  }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds items to the action bar if it is present.
  getMenuInflater().inflate(R.menu.main, menu);
  return true;
}

}

package cn.edu.bzu.fruits;

public class Fruits {
private String Name;
private int FruitId;
public String getName() {
  return Name;
}
public void setName(String name) {
  Name = name;
}
public int getFruitId() {
  return FruitId;
}
public void setFruitId(int fruitId) {
  FruitId = fruitId;
}
public int getImageId() {
  // TODO Auto-generated method stub
  return 0;
}
}

布局文件fruit_item.xml自定义的布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" >

</LinearLayout>

package cn.edu.bzu.adapter;

import cn.edu.bzu.androidboke.R;
import cn.edu.bzu.fruits.Fruits;

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 FruitAdapter extends ArrayAdapter {
private int resourceId;
public FruitAdapter(Context context, int resource, int textViewResourceId) {
  super(context, resource, textViewResourceId);
  resourceId=textViewResourceId;
  // TODO Auto-generated constructor stub
}

public View getView(int position,View convertView,ViewGroup parent){
  //此方法当每个子项被滚动到的时候都会被调用
  Fruits fruit = (Fruits) getItem(position);
  //把子项的图片和文字转换为View
  View view = LayoutInflater.from(getContext()).inflate(resourceId, null);
  //设置被滚动到的图片和文字
  ImageView fruitImage = (ImageView) view.findViewById(R.id.ivfruit);
  TextView fruitName = (TextView) view.findViewById(R.id.tvfruit);
  fruitImage.setImageResource(fruit.getFruitId());
  fruitName.setText(fruit.getName());
  return view;
}

}

实现效果