PinterestLikeAdapterView

布局文件

actviity_main.xml

<?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">

    <com.huewu.pla.lib.MultiColumnListView
        xmlns:pla="http://schemas.android.com/apk/res-auto"
        android:id="@+id/listview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        pla:plaColumnNumber="2"/>

</LinearLayout>

image_item.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" 
    android:padding="5dp">

    <com.android.volley.toolbox.NetworkImageView
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/row_icon"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="1dp"
        android:adjustViewBounds="true"/>
</FrameLayout>

SampleActivity.java

package com.atguigu.platest;

import java.util.ArrayList;

import com.huewu.pla.lib.MultiColumnListView;
import com.huewu.pla.sample.R;

import android.app.Activity;
import android.os.Bundle;

public class SampleActivity extends Activity {

	//获取listview
	private MultiColumnListView listview;
	//获取图片集合
	ArrayList<String> imageList = new ArrayList<String>();
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.actviity_main);
		
		init();
	}
	private void init() {
		listview = (MultiColumnListView) findViewById(R.id.listview);
		
		imageList.add("http://www.yjz9.com/uploadfile/2012/1219/20121219043531502.jpg");
		imageList.add("http://www.yjz9.com/uploadfile/2012/1219/20121219043533581.jpg");
		imageList.add("http://www.yjz9.com/uploadfile/2012/1219/20121219043533571.jpg");
		imageList.add("http://www.yjz9.com/uploadfile/2012/1219/20121219043534672.jpg");
		imageList.add("http://www.yjz9.com/uploadfile/2012/1219/20121219043534854.jpg");
		imageList.add("http://www.yjz9.com/uploadfile/2012/1219/20121219043535929.jpg");
		imageList.add("http://www.yjz9.com/uploadfile/2012/1219/20121219043535784.jpg");
		imageList.add("http://www.yjz9.com/uploadfile/2012/1219/20121219043536626.jpg");
		imageList.add("http://www.yjz9.com/uploadfile/2012/1219/20121219043536244.jpg");
		imageList.add("http://g.hiphotos.baidu.com/image/pic/item/43a7d933c895d14323898b5970f082025baf07c8.jpg");
		imageList.add("http://c.hiphotos.baidu.com/image/pic/item/b3b7d0a20cf431ad99736b5d4836acaf2edd9834.jpg");
		//设置适配器
		listview.setAdapter(new WaterfallAdapter(imageList, this));
	}
}

WaterfallAdapter.java

package com.atguigu.platest;

import java.util.ArrayList;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;

import com.android.volley.toolbox.NetworkImageView;
import com.huewu.pla.sample.R;

public class WaterfallAdapter extends BaseAdapter {

	ArrayList<String> list;
	Context context;

	public WaterfallAdapter(ArrayList<String> list, Context context) {
		this.list = list;
		this.context = context;
	}

	@Override
	public int getCount() {
		return list.size();
	}

	@Override
	public Object getItem(int position) {
		return list.get(position);
	}

	@Override
	public long getItemId(int arg0) {
		return 0;
	}

	@Override
	public View getView(final int position, View view, ViewGroup group) {
		final Holder holder;
		// 得到View
		if (view == null) {
			holder = new Holder();
			LayoutInflater inflater = LayoutInflater.from(context);
			view = inflater.inflate(R.layout.image_item, null);
			holder.ivIcon = (NetworkImageView) view.findViewById(R.id.row_icon);
			view.setTag(holder);
		} else {
			holder = (Holder) view.getTag();
		}

		String url = list.get(position);
		holder.ivIcon.setDefaultImageResId(R.drawable.load_default);
		holder.ivIcon.setImageUrl(url, VolleyUtils.getInstance(context)
				.getImageLoader());
		return view;
	}

}

class Holder {
	public NetworkImageView ivIcon;
}

VolleyUtils.java

package com.atguigu.platest;

import android.content.Context;
import android.graphics.Bitmap;
import android.support.v4.util.LruCache;
import android.util.Log;

import com.android.volley.RequestQueue;
import com.android.volley.toolbox.ImageLoader;
import com.android.volley.toolbox.ImageLoader.ImageCache;
import com.android.volley.toolbox.Volley;

public class VolleyUtils {
	private RequestQueue queue;
	private ImageLoader imageLoader;

	//私有静态实例
	private static VolleyUtils instance;

	//私有构造方法
	private VolleyUtils(Context context) {
		this.queue = Volley.newRequestQueue(context);
		this.imageLoader = new ImageLoader(queue, new LruImageCache());
	}
	//对外提供公共的静态方法
	public static VolleyUtils getInstance(Context context) {
		if (instance == null) {
			instance = new VolleyUtils(context);
		}
		return instance;
	}

	/*
	 * 提供获取RequestQueue imageLoader方法
	 */
	public RequestQueue getQueue() {
		return queue;
	}

	public ImageLoader getImageLoader() {
		return imageLoader;
	}

	/**
	 * 使用LRU回收算法的Bitmap缓存的类
	 */
	class LruImageCache implements ImageCache {

		//缓存图片对象的容器(内部使用LinkedHashMap)
		private LruCache<String, Bitmap> cache;

		public LruImageCache() {
			//得到缓存图片的最大内存
			int maxSize = (int) Runtime.getRuntime().maxMemory() / 8;
			cache = new LruCache<String, Bitmap>(maxSize) {
				@Override
				protected int sizeOf(String key, Bitmap value) {
					// 得到一个图片的大小(byte)
					int size = value.getRowBytes() * value.getHeight();
					return size;
				}
				
				@Override
				protected void entryRemoved(boolean evicted, String key,
						Bitmap oldValue, Bitmap newValue) {
					Log.e("TAG", "移除 "+oldValue);
				}
			};
		}

		/**
		 * 从缓存中得到图片对象
		 */
		@Override
		public Bitmap getBitmap(String url) {
			return cache.get(url);
		}

		/**
		 * 缓存图片
		 * 如果超过了设置的最大缓存, 内部会移除使用最少的bitmap对象
		 */
		@Override
		public void putBitmap(String url, Bitmap bitmap) {
			cache.put(url, bitmap);
		}
	}
}