[文件] ImageManager2.java ~ 13KB    下载(5) package com.example.util;import java.io.File;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.Queue;
import java.util.Stack;http://www.fp1111.info/linked/20130304.do;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.util.EntityUtils;import android.app.ActivityManager;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.TransitionDrawable;
import android.media.ThumbnailUtils;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Looper;
import android.os.Message;
import android.support.v4.util.LruCache;
import android.widget.ImageView;import com.example.MyApplication;/*** 图像加载类* * @author 月月鸟*/
public class ImageManager2 {private static ImageManager2 imageManager;public LruCache mMemoryCache;private static final int DISK_CACHE_SIZE = 1024 * 1024 * 20; // 10MBprivate static final String DISK_CACHE_SUBDIR = "thumbnails";public DiskLruCache mDiskCache;private static MyApplication myapp;/** 图像加载行列，后进先出 */private Stack mImageQueue = new Stack();/** 图像恳求行列，先进先出，用于寄存已发送的恳求。 */private Queue mRequestQueue = new LinkedList();/** 图像加载线程音讯处理器 */private Handler mImageLoaderHandler;/** 图像加载线程能否安排妥当 */private boolean mImageLoaderIdle = true;/** 恳求图像 */private static final int MSG_REQUEST = 1;/** 图像加载完结 */private static final int MSG_REPLY = 2;/** 间断图像加载线程 */private static final int MSG_STOP = 3;/** 若是图像是从网络加载，则运用渐显动画，若是从缓存读出则不运用动画 */private boolean isFromNet = true;/*** 获取单例，只能在UI线程中运用。* * @param context* @return*/public static ImageManager2 from(Context context) {// 若是不在ui线程中，则抛出反常if (Looper.myLooper() != Looper.getMainLooper()) {throw new RuntimeException("Cannot instantiate outside UI thread.");}if (myapp == null) {myapp = (MyApplication) context.getApplicationContext();}if (imageManager == null) {imageManager = new ImageManager2(myapp);}return imageManager;}/*** 私有结构函数，确保单例形式* * @param context*/private ImageManager2(Context context) {int memClass = ((ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE)).getMemoryClass();memClass = memClass > 32 ? 32 : memClass;// 运用可用内存的1/8作为图像缓存final int cacheSize = 1024 * 1024 * memClass / 8;mMemoryCache = new LruCache(cacheSize) {protected int sizeOf(String key, Bitmap bitmap) {return bitmap.getRowBytes() * bitmap.getHeight();}};File cacheDir = DiskLruCache.getDiskCacheDir(context, DISK_CACHE_SUBDIR);mDiskCache = DiskLruCache.openCache(context, cacheDir, DISK_CACHE_SIZE);}/*** 寄存图像信息*/class ImageRef {/** 图像对应ImageView控件 */ImageView imageView;/** 图像URL地址 */String url;/** 图像缓存途径 */String filePath;/** 默许图资源ID */int resId;int width = 0;int height = 0;/*** 结构函数* * @param imageView* @param url* @param resId* @param filePath*/ImageRef(ImageView imageView, String url, String filePath, int resId) {this.imageView = imageView;this.url = url;this.filePath = filePath;this.resId = resId;}ImageRef(ImageView imageView, String url, String filePath, int resId,int width, int height) {this.imageView = imageView;this.url = url;this.filePath = filePath;this.resId = resId;this.width = width;this.height = height;}}/*** 显现图像* * @param imageView* @param url* @param resId*/public void displayImage(ImageView imageView, String url, int resId) {if (imageView == null) {return;}if (imageView.getTag() != nullhttp://www.1111kp.info/linked/20130304.do;