Android：ListView简单实例

ListView是Android中最重要的控件之一，是用于对数据进行列展示的控件。ListView允许用户通过手指上下滑动的方式将屏幕外的数据滚动到屏幕内，同时屏幕内的数据则会滚动出屏幕。

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实例一

效果展示：

1.样式布局文件listview_layout

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout	xmlns:android="http://schemas.android.com/apk/res/android"	xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ListViewActivity">
    <ListView
        android:id="@+id/list_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</LinearLayout>

2.ListViewActivity.java

public class ListViewActivity extends AppCompatActivity {
    private String[] data = {"Ashin","Monster","Masa","Stone","Ming","MAYDAY","You","and","I"};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
       	super.onCreate(savedInstanceState);
        setContentView(R.layout.listview_layout);
   	ArrayAdapter<String> myAdapter = new ArrayAdapter<String>(ListViewActivity.this,android.R.layout.simple_expandable_list_item_1,data);
        ListView listview = (ListView)findViewById(R.id.list_view);
        listview.setAdapter(myAdapter);
    }
}

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实例二

效果展示：

图片下载地址：https://www.iconfont.cn/ （可以选择自己喜欢的图）

1.listview_layout.xml 同上
2.food_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout	xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent">    
    <ImageView
        android:id="@+id/food_image"
        //可以自己设置图片大小
        android:layout_width="100dip"
        android:layout_height="100dip" />
    <TextView
        android:id="@+id/food_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginLeft="10dip"/>
</LinearLayout>

3.ListViewActivity1.java

public class ListViewActivity1 extends AppCompatActivity {
    private List<Food> foodList = new ArrayList<Food>(); 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
        setContentView(R.layout.listview_layout);
	initFood();
	FoodAdapter myFoodAdapter = new FoodAdapter(ListViewActivity1.this,R.layout.food_item,foodList);
	ListView listView = (ListView) findViewById(R.id.list_view);
	listView.setAdapter(myFoodAdapter);
	private void initFood() {
		//图片存放在drawable
		Food burger = new Food("burger", R.drawable.burger);
		foodList.add(burger);
		Food cheese = new Food("cheese", R.drawable.cheese);
		foodList.add(cheese);
		Food cupcake = new Food("cupcake", R.drawable.cupcake);
		foodList.add(cupcake);
		Food egg = new Food("egg", R.drawable.egg);
		foodList.add(egg);
		Food honey = new Food("honey", R.drawable.honey);
		foodList.add(honey);
		Food hot_dog = new Food("hot_dog", R.drawable.hot_dog);
		foodList.add(hot_dog);
		Food ice_cream = new Food("ice_cream", R.drawable.ice_cream);
		foodList.add(ice_cream);
		Food milk = new Food("milk", R.drawable.milk);
		foodList.add(milk);
		Food ramen = new Food("ramen", R.drawable.ramen);
		foodList.add(ramen);
	}
}

4.Food.java

public class Food {
    private String name;
  	private int imageId;
    public Food(String foodname,int foodimage){
        this.name = foodname;
        this.imageId = foodimage;
    }
    public String getName(){
        return name;
    }
    public int getImageId(){
        return imageId;
    }
}

5.FoodAdapter.java

import java.util.List;
public class FoodAdapter extends ArrayAdapter {
	private final int resourceId;
   	public FoodAdapter(@NonNull Context context, int textViewResourceId, @NonNull List objects) {
        super(context,textViewResourceId, objects);
        resourceId = textViewResourceId;
    }
    public View getView(int position, View converView, ViewGroup parent){
        Food food = (Food)getItem(position);
        View view;
        ViewHolder viewHolder;
        if(converView == null){
            view = LayoutInflater.from(getContext()).inflate(resourceId,parent,false);
            viewHolder = new ViewHolder();
            viewHolder.foodImage = (ImageView)view.findViewById(R.id.food_image);
            viewHolder.foodName = (TextView)view.findViewById(R.id.food_name);
            view.setTag(viewHolder);
        }
        else{
            view = converView;
            viewHolder = (ViewHolder)view.getTag();
        }
        viewHolder.foodImage.setImageResource(food.getImageId());
        viewHolder.foodName.setText(food.getName());
        return view;
    }
    class ViewHolder{
        ImageView foodImage;
        TextView foodName;
    }
 }