/*
* Copyright (C) 2012 www.amsoft.cn
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.ab.image;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import android.content.Context;
import android.content.pm.PackageInfo;
import android.graphics.Bitmap;
import android.view.View;
import android.widget.ImageView;
import com.ab.cache.AbCacheHeaderParser;
import com.ab.cache.AbCacheResponse;
import com.ab.cache.AbCacheUtil;
import com.ab.cache.AbDiskBaseCache;
import com.ab.cache.AbDiskCache.Entry;
import com.ab.cache.image.AbBitmapResponse;
import com.ab.cache.image.AbImageBaseCache;
import com.ab.global.AbAppConfig;
import com.ab.task.AbTaskItem;
import com.ab.task.AbTaskObjectListener;
import com.ab.task.thread.AbTaskQueue;
import com.ab.util.AbAppUtil;
import com.ab.util.AbFileUtil;
import com.ab.util.AbImageUtil;
import com.ab.util.AbLogUtil;
import com.ab.util.AbStrUtil;
// TODO: Auto-generated Javadoc
/**
* © 2012 amsoft.cn
* 名称：AbImageLoader.java
* 描述：下载图片并显示的工具类.
*
* @author 还如一梦中
* @version v1.0
* @date：2011-12-10 上午10:10:53
*/
public class AbImageLoader {
/** 上下文. */
private Context context = null;
/** 单例对象. */
private static AbImageLoader imageLoader = null;
/** 缓存超时时间设置. */
private long cacheMaxAge;
/** 请求队列. */
private List<AbTaskQueue> taskQueueList;
/** 图片缓存. */
private AbImageBaseCache memCache;
/** 磁盘缓存. */
private AbDiskBaseCache diskCache;
/**
* 构造图片下载器.
*
* @param context the context
*/
public AbImageLoader(Context context) {
this.context = context;
this.cacheMaxAge = AbAppConfig.DISK_CACHE_EXPIRES_TIME;
this.taskQueueList = new ArrayList<AbTaskQueue>();
PackageInfo info = AbAppUtil.getPackageInfo(context);
File cacheDir = null;
if(!AbFileUtil.isCanUseSD()){
cacheDir = new File(context.getCacheDir(), info.packageName);
}else{
cacheDir = new File(AbFileUtil.getCacheDownloadDir(context));
}
this.diskCache = new AbDiskBaseCache(cacheDir);
this.memCache = AbImageBaseCache.getInstance();
}
/**
*
* 获得一个实例.
* @param context
* @return
*/
public static AbImageLoader getInstance(Context context) {
if (imageLoader == null) {
imageLoader = new AbImageLoader(context);
}
return imageLoader;
}
/**
*
* 显示这个图片.
* @param imageView
* @param url
* @param desiredWidth
* @param desiredHeight
*/
public void display(ImageView imageView,String url,int desiredWidth, int desiredHeight){
download(imageView,url,desiredWidth,desiredHeight,new OnImageListener() {
@Override
public void onSuccess(ImageView imageView, Bitmap bitmap) {
imageView.setImageBitmap(bitmap);
}
@Override
public void onLoading(ImageView imageView) {
}
@Override
public void onError(ImageView imageView) {
}
@Override
public void onEmpty(ImageView imageView) {
}
});
}
/**
*
* 显示这个图片(按照原图尺寸).
* ImageView使用android:scaleType="fitXY"属性仍旧可以充满
* @param imageView
* @param url
*/
public void display(ImageView imageView,String url){
download(imageView,url,-1,-1,new OnImageListener() {
@Override
public void onSuccess(ImageView imageView, Bitmap bitmap) {
imageView.setImageBitmap(bitmap);
}
@Override
public void onLoading(ImageView imageView) {
}
@Override
public void onError(ImageView imageView) {
imageView.setVisibility(View.VISIBLE);
imageView.setImageBitmap(null);
}
@Override
public void onEmpty(ImageView imageView) {
imageView.setVisibility(View.VISIBLE);
imageView.setImageBitmap(null);
}
});
}
/**
*
* 显示这个图片.
* @param imageView
* @param loadingView
* @param url
* @param desiredWidth
* @param desiredHeight
*/
public void display(final ImageView imageView,final View loadingView,final String url,final int desiredWidth,final int desiredHeight){
download(imageView,url,desiredWidth,desiredHeight,new OnImageListener() {
public void onSuccess(ImageView imageView, Bitmap bitmap) {
imageView.setImageBitmap(bitmap);
imageView.setVisibility(View.VISIBLE);
loadingView.setVisibility(View.GONE);
}
@Override
public void onLoading(ImageView imageView) {
imageView.setVisibility(View.GONE);
loadingView.setVisibility(View.VISIBLE);
}
@Override
public void onError(ImageView imageView) {
loadingView.setVisibility(View.GONE);
imageView.setVisibility(View.VISIBLE);
imageView.setImageBitmap(null);
}
@Override
public void onEmpty(ImageView imageView) {
imageView.setImageBitmap(null);
loadingView.setVisibility(View.GONE);
imageView.setVisibility(View.VISIBLE);
}
});
}
/**
*
* 下载这个图片.
* @param imageView
* @param url
* @param desiredWidth
* @param desiredHeight
*/
public void download(final ImageView imageView,final String url,final int desiredWidth,final int desiredHeight,final OnImageListener onImageListener) {
if(AbStrUtil.isEmpty(url)){
if(onImageListener!=null){
onImageListener.onEmpty(imageView);
}
return;
}
final String cacheKey = memCache.getCacheKey(url, desiredWidth, desiredHeight);
//先看内存
Bitmap bitmap = memCache.getBitmap(cacheKey);
AbLogUtil.i(AbImageLoader.class, "从LRUCache中获取到的图片"+cacheKey+":"+bitmap);
if(bitmap != null){
if(onImageListener!=null){
onImageListener.onSuccess(imageView, bitmap);
}
}else{
if(onImageListener!=null){
onImageListener.onLoading(imageView);
}
if(imageView != null){
//设置标记,目的解决闪烁问题
imageView.setTag(url);
}
AbTaskItem item = new AbTaskItem();
item.setListener(new AbTaskObjectListener(){
@Override
public <T> void update(T entity) {
AbBitmapResponse response = (AbBitmapResponse)entity;
if(response == null){
if(onImageListener!=null){
onImageListener.onError(imageView);
}
}else{
Bitmap bitmap = response.getBitmap();
//要判断这个imageView的url有变化，如果没有变化才set
//有变化就取消，解决列表的重复利用View的问题
if(bitmap==null){
if(onImageListener!=null){
onImageListener.onEmpty(imageView);
}
}else if(imageView == null || url.equals(imageView.getTag())){
if(onImageListener!=null){
onImageListener.onSuccess(imageView, bitmap);
}
}
AbLogUtil.d(AbImageLoader.class, "获取到图片："+bitmap);
}
}
@Override
public AbBitmapResponse getObject() {
return getBitmapResponse(url, desiredWidth, desiredHeight);
}
});
add2Queue(item);
}
}
/**
*
* 下载这个图片.
* @param url
* @param desiredWidth
* @param desiredHeight
*/
public void download(final String url,final int desiredWidth,final int desiredHeight,final OnImageListener2 onImageListener) {
if(AbStrUtil.isEmpty(url)){
if(onImageListener!=null){
onImageListener.onEmpty();
}
return;
}
final String cacheKey = memCache.getCacheKey(url, desiredWidth, desiredHeight);
//先看内存
Bitmap bitmap = memCache.getBitmap(cacheKey);
AbLogUtil.i(AbImageLoader.class, "从LRUCache中获取到的图片"+cacheKey+":"+bitmap);
if(bitmap != null){
if(onImageListener!=null){
onImageListener.onSuccess(bitmap);
}
}else{
if(onImageListener!=null){
onImageListener.onLoading();
}
AbTaskItem item = new AbTaskItem();
item.setListener(new AbTaskObjectListener(){
@Override
public <T> void update(T entity) {
AbBitmapResponse response = (AbBitmapResponse)entity;
if(response == null){
if(onImageListener!=null){
onImageListener.onError();
}
}else{
Bitmap bitmap = response.getBitmap();
//要判断这个imageView的url有变化，如果没有变化才set
//有变化就取消，解决列表的重复利用View的问题
if(bitmap==null){
if(onImageListener!=null){
onImageListener.onEmpty();
}
}else {
if(onImageListener!=null){
onImageListener.onSuccess(bitmap);
}
}
AbLogUtil.d(AbImageLoader.class, "获取到图片："+bitmap);
}
}
@Override
public AbBitmapResponse getObject() {
try {
return getBitmapResponse(url, desiredWidth, desiredHeight);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
});
add2Queue(item);
}
}
/**
*
* 获取AbBitmapResponse.
* @param url
* @param desiredWidth
* @param desiredHeight
* @return
*/
public AbBitmapResponse getBitmapResponse(String url,int desiredWidth,int desiredHeight){
AbBitmapResponse bitmapResponse = null;
try {
final String cacheKey = memCache.getCacheKey(url, desiredWidth, desiredHeight);
Bitmap bitmap = null;
//看磁盘
Entry entry = diskCache.get(cacheKey);
if(entry == null || entry.isExpired()){
if(entry == null){
AbLogUtil.i(AbImageLoader.class, "磁盘中没有这个图片");
}else{
if(entry.isExpired()){
AbLogUtil.i(AbImageLoader.class, "磁盘中图片已经过期");
}
}
AbCacheResponse response = AbCacheUtil.getCacheResponse(url);
if(response!=null){
bitmap = AbImageUtil.getBitmap(response.data, desiredWidth, desiredHeight);
if(bitmap!=null){
memCache.putBitmap(cacheKey, bitmap);
AbLogUtil.i(AbImageLoader.class, "图片缓存成功");
diskCache.put(cacheKey, AbCacheHeaderParser.parseCacheHeaders(response,cacheMaxAge));
}
}
}else{
//磁盘中有
byte [] bitmapData = entry.data;
bitmap = AbImageUtil.getBitmap(bitmapData, desiredWidth, desiredHeight);
memCache.putBitmap(cacheKey, bitmap);
}
bitmapResponse = new AbBitmapResponse(url);
bitmapResponse.setBitmap(bitmap);
} catch (Exception e) {
e.printStackTrace();
}
return bitmapResponse;
}
/**
*
* 设置缓存的最大时间.
* @return
*/
public long getCacheMaxAge() {
return cacheMaxAge;
}
/**
*
* 获取缓存的最大时间.
* @param cacheMaxAge
*/
public void setCacheMaxAge(long cacheMaxAge) {
this.cacheMaxAge = cacheMaxAge;
}
/**
* 监听器
*/
public interface OnImageListener {
/**
* On Empty.
* @param imageView
*/
public void onEmpty(ImageView imageView);
/**
* On Loading.
* @param imageView
*/
public void onLoading(ImageView imageView);
/**
* On Error.
* @param imageView
*/
public void onError(ImageView imageView);
/**
*
* On response.
* @param imageView
* @param bitmap
*/
public void onSuccess(ImageView imageView,Bitmap bitmap);
}
/**
* 监听器
*/
public interface OnImageListener2 {
/**
* On Empty.
* @param imageView
*/
public void onEmpty();
/**
* On Loading.
* @param imageView
*/
public void onLoading();
/**
* On Error.
* @param imageView
*/
public void onError();
/**
*
* On response.
* @param imageView
* @param bitmap
*/
public void onSuccess(Bitmap bitmap);
}
/**
*
* 增加到最少的队列中.
* @param item
*/
private void add2Queue(AbTaskItem item){
int minQueueIndex = 0;
if(taskQueueList.size() == 0){
AbTaskQueue queue = AbTaskQueue.newInstance();
taskQueueList.add(queue);
queue.execute(item);
}else{
int minSize = 0;
for(int i=0;i<taskQueueList.size();i++){
AbTaskQueue queue = taskQueueList.get(i);
int size = queue.getTaskItemListSize();
if(i==0){
minSize = size;
minQueueIndex = i;
}else{
if(size < minSize){
minSize = size;
minQueueIndex = i;
}
}
}
if(taskQueueList.size() <5 && minSize > 2){
AbTaskQueue queue = AbTaskQueue.newInstance();
taskQueueList.add(queue);
queue.execute(item);
}else{
AbTaskQueue minQueue = taskQueueList.get(minQueueIndex);
minQueue.execute(item);
}
}
for(int i=0;i<taskQueueList.size();i++){
AbTaskQueue queue = taskQueueList.get(i);
int size = queue.getTaskItemListSize();
AbLogUtil.i(AbImageLoader.class, "线程队列["+i+"]的任务数："+size);
}
}
/**
*
* 释放资源.
*/
public void cancelAll(){
for(int i=0;i<taskQueueList.size();i++){
AbTaskQueue queue = taskQueueList.get(i);
queue.cancel(true);
}
taskQueueList.clear();
}
public AbImageBaseCache getMemCache() {
return memCache;
}
public void setMemCache(AbImageBaseCache memCache) {
this.memCache = memCache;
}
public AbDiskBaseCache getDiskCache() {
return diskCache;
}
public void setDiskCache(AbDiskBaseCache diskCache) {
this.diskCache = diskCache;
}
}