Android listview 的应用

ListView作为Android最常用但是却最难用的控件之一,有很多神奇的用法.我之前也有写过一个例子,稍微不那么简单了一点.

[Android原生item的伸缩效果]:http://www.cnblogs.com/stareblankly/p/4958062.html

• 简单的ListView的应用.

private Integer[] data={1,1,1,1,1,1,1,1,1,1,1,1,1,1,1};
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(R.layout.activity_main);
		ArrayAdapter<Integer> adapter=new ArrayAdapter<Integer>(MainActivity.this, android.R.layout.simple_list_item_1,data);
		((ListView)findViewById(R.id.lv)).setAdapter(adapter);
	}

• 定制ListView界面
  
  1.我们新建一个furit_item.xml作为我们自定义listview的item.

<?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="vertical" >

    <ImageView
        android:id="@+id/furit_image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/fruit_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginLeft="10dp" />

</LinearLayout>

2.然后我们新建一个Furit.class作为数据适配的实体类.

public class Fruit {

	private String name;
	private int imageId;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getImageId() {
		return imageId;
	}

	public void setImageId(int imageId) {
		this.imageId = imageId;
	}

	public Fruit(String name, int imageId) {
		super();
		this.name = name;
		this.imageId = imageId;
	}
}

3.新建一个FruitAdapter.class适配器用来适配listview.

public class FruitAdapter extends ArrayAdapter<Fruit>{

	private int resourceid;

	public FruitAdapter(Context context, int textViewResourceId,
			List<Fruit> objects) {
		super(context,textViewResourceId, objects);
		resourceid=textViewResourceId;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		Fruit fruit=getItem(position);
		View view=LayoutInflater.from(getContext()).inflate(resourceid, null);
		TextView tv=(TextView) view.findViewById(R.id.fruit_name);
		ImageView iv=(ImageView) view.findViewById(R.id.furit_image);
		iv.setImageResource(fruit.getImageId());
		tv.setText(fruit.getName());
		return view;
	}
}

4.然后初始化我们要显示的数据.

private List<Fruit> fruitList=new ArrayList<Fruit>();

Fruit fruit=new Fruit("1", R.drawable.ic_launcher);
fruitList.add(fruit);
fruit=new Fruit("2", R.drawable.ic_launcher);
fruitList.add(fruit);
fruit=new Fruit("3", R.drawable.ic_launcher);
fruitList.add(fruit);
......

5.最后就只剩下使用了.

protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		init();
		FruitAdapter adapter=new FruitAdapter(this, R.layout.fruit_item, fruitList);
		((ListView)findViewById(R.id.lv)).setAdapter(adapter);
	}

• ListView的item的点击事件

((ListView)findViewById(R.id.lv)).setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				Fruit fruit=fruitList.get(position);
				Toast.makeText(MainActivity.this, fruit.getName(), Toast.LENGTH_SHORT).show();
			}
		});