BitmapManager.java

package com.partynetwork.iparty.app.common;

import java.io.File;
import java.io.IOException;
import java.lang.ref.SoftReference;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.WeakHashMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import com.lidroid.xutils.bitmap.BitmapDisplayConfig;
import com.lidroid.xutils.bitmap.callback.BitmapLoadCallBack;
import com.lidroid.xutils.bitmap.callback.BitmapLoadFrom;
import com.partynetwork.iparty.app.AppContext;
import com.partynetwork.iparty.app.AppException;
import com.partynetwork.iparty.app.api.ApiClient;

import android.graphics.Bitmap;
import android.graphics.drawable.Drawable;
import android.widget.ImageView;

/**
 * 异步线程加载图片工具类 使用说明： BitmapManager bmpManager; bmpManager = new
 * BitmapManager(BitmapFactory.decodeResource(context.getResources(),
 * R.drawable.loading)); bmpManager.loadBitmap(imageURL, imageView);
 * 
 * @author liux (http://my.oschina.net/liux)
 * @version 1.0
 * @created 2012-6-25
 */
public class BitmapManager {

	private static HashMap<String, SoftReference<Bitmap>> cache;
	private static ExecutorService pool;
	private static Map<ImageView, String> imageViews;
	private Bitmap defaultBmp;

	static {
		cache = new HashMap<String, SoftReference<Bitmap>>();
		pool = Executors.newFixedThreadPool(5); // 固定线程池
		imageViews = Collections
				.synchronizedMap(new WeakHashMap<ImageView, String>());
	}

	public BitmapManager() {
	}

	public BitmapManager(Bitmap def) {
		this.defaultBmp = def;
	}

	/**
	 * 设置默认图片
	 * 
	 * @param bmp
	 */
	public void setDefaultBmp(Bitmap bmp) {
		defaultBmp = bmp;
	}

	/**
	 * 加载图片
	 * 
	 * @param url
	 * @param imageView
	 */
	public void loadBitmap(String url, ImageView imageView) {
		AppContext.getInstance().getBitmapUtils().display(imageView, url);
		// ImageLoader.getInstance().displayImage(url, imageView);
		// loadBitmap(url, imageView, this.defaultBmp, 0, 0);
	}

	/**
	 * 加载图片-可设置加载失败后显示的默认图片
	 * 
	 * @param url
	 * @param imageView
	 * @param defaultBmp
	 */
	public void loadBitmap(String url, ImageView imageView, Bitmap defaultBmp) {
		loadBitmap(url, imageView, defaultBmp, 0, 0);
	}

	/**
	 * 加载图片-可指定显示图片的高宽
	 * 
	 * @param url
	 * @param imageView
	 * @param width
	 * @param height
	 */
	public void loadBitmap(String url, ImageView imageView, Bitmap defaultBmp,
			int width, int height) {
		imageViews.put(imageView, url);
		Bitmap bitmap = getBitmapFromCache(url);

		if (bitmap != null) {
			// 显示缓存图片
			imageView.setImageBitmap(bitmap);
		} else {
			// 加载SD卡中的图片缓存
			String filename = FileUtils.getFileName(url);
			String filepath = imageView.getContext().getFilesDir()
					+ File.separator + filename;
			File file = new File(filepath);
			if (file.exists()) {
				// 显示SD卡中的图片缓存
				Bitmap bmp = ImageUtils.getBitmap(imageView.getContext(),
						filename);
				imageView.setImageBitmap(bmp);
			} else {
				// 线程加载网络图片
				imageView.setImageBitmap(defaultBmp);
				queueJob(url, imageView, width, height);
			}
		}
	}

	/**
	 * 从缓存中获取图片
	 * 
	 * @param url
	 */
	public Bitmap getBitmapFromCache(String url) {
		Bitmap bitmap = null;
		if (cache.containsKey(url)) {
			bitmap = cache.get(url).get();
		}
		return bitmap;
	}

	/**
	 * 从网络中加载图片
	 * 
	 * @param url
	 * @param imageView
	 * @param width
	 * @param height
	 */
	public void queueJob(final String url, final ImageView imageView,
			final int width, final int height) {
		BitmapLoadCallBack<ImageView> listener = new BitmapLoadCallBack<ImageView>() {

			@Override
			public void onLoadFailed(ImageView arg0, String arg1, Drawable arg2) {
				// TODO 自动生成的方法存根

			}

			@Override
			public void onLoadCompleted(ImageView arg0, String arg1,
					Bitmap arg2, BitmapDisplayConfig arg3, BitmapLoadFrom arg4) {
				try {
					ImageUtils.saveImage(arg0.getContext(), arg1, arg2);
				} catch (IOException e) {
					// TODO 自动生成的 catch 块
					e.printStackTrace();
				}
			}
		};
		AppContext.getInstance().getBitmapUtils()
				.display(imageView, url, listener);
	}

	/**
	 * 下载图片-可指定显示图片的高宽
	 * 
	 * @param url
	 * @param width
	 * @param height
	 */
	private Bitmap downloadBitmap(String url, int width, int height) {
		Bitmap bitmap = null;
		try {
			// http加载图片
			bitmap = ApiClient.getNetBitmap(url);
			if (width > 0 && height > 0) {
				// 指定显示图片的高宽
				bitmap = Bitmap.createScaledBitmap(bitmap, width, height, true);
			}
			// 放入缓存
			cache.put(url, new SoftReference<Bitmap>(bitmap));
		} catch (AppException e) {
			e.printStackTrace();
		}
		return bitmap;
	}
}