/*
* Copyright (C) 2013 www.418log.org
*
* 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.bitmap;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.TransitionDrawable;
import android.view.View;
import android.widget.ImageView;
import com.ab.global.AbAppData;
import com.ab.global.AbConstant;
import com.ab.util.AbImageUtil;
import com.ab.util.AbStrUtil;
// TODO: Auto-generated Javadoc
/**
* 描述：下载图片并显示的工具类.
*
* @author zhaoqp
* @date 2011-12-10
* @version v1.0
*/
public class AbImageDownloader {
/** The tag. */
private static String TAG = "AbImageDownloader";
/** The Constant D. */
private static final boolean D = AbAppData.DEBUG;
/** Context. */
private static Context context = null;
/** 显示的图片的宽. */
private int width;
/** 显示的图片的高. */
private int height;
/** 图片的处理类型（剪切或者缩放到指定大小，参考AbConstant类）. */
private int type = AbConstant.ORIGINALIMG;
/** 显示为下载中的图片. */
private Drawable loadingImage;
/** 显示为下载中的View. */
private View loadingView;
/** 显示下载失败的图片. */
private Drawable errorImage;
/** 图片未找到的图片. */
private Drawable noImage;
/** 线程池. */
private AbImageDownloadPool mAbImageDownloadPool = null;
/** 动画控制. */
private boolean animation;
/**
* 构造图片下载器.
*/
public AbImageDownloader(Context context) {
this.context = context;
this.mAbImageDownloadPool = AbImageDownloadPool.getInstance();
}
/**
* 显示这个图片.
* 加入动画效果后加载下一页后图片会全部闪一下，因为设置了不同的图片
* @param imageView 显得的View
* @return url 网络url
*/
public void display(final ImageView imageView,String url) {
if(AbStrUtil.isEmpty(url)){
if(noImage != null){
if(loadingView != null){
loadingView.setVisibility(View.INVISIBLE);
imageView.setVisibility(View.VISIBLE);
}
imageView.setImageDrawable(noImage);
}
return;
}
//设置下载项
AbImageDownloadItem item = new AbImageDownloadItem();
//设置显示的大小
item.width = width;
item.height = height;
//设置为缩放
item.type = type;
item.imageUrl = url;
String cacheKey = AbImageCache.getCacheKey(item.imageUrl, item.width, item.height, item.type);
item.bitmap = AbImageCache.getBitmapFromCache(cacheKey);
//if(D) Log.d(TAG, "缓存中获取的"+cacheKey+":"+item.bitmap);
if(item.bitmap == null){
//先显示加载中
if(loadingView!=null){
loadingView.setVisibility(View.VISIBLE);
imageView.setVisibility(View.INVISIBLE);
}else if(loadingImage != null){
if(animation){
TransitionDrawable td = AbImageUtil.drawableToTransitionDrawable(loadingImage);
imageView.setImageDrawable(td);
td.startTransition(200);
}else{
imageView.setImageDrawable(loadingImage);
}
}
//下载完成后更新界面
item.listener = new AbImageDownloadListener() {
@Override
public void update(Bitmap bitmap, String imageUrl) {
//未设置加载中的图片，并且设置了隐藏的View
if(loadingView != null){
loadingView.setVisibility(View.INVISIBLE);
imageView.setVisibility(View.VISIBLE);
}
if(bitmap!=null){
if(animation){
TransitionDrawable td = AbImageUtil.bitmapToTransitionDrawable(bitmap);
imageView.setImageDrawable(td);
td.startTransition(200);
}else{
imageView.setImageBitmap(bitmap);
}
}else{
if(errorImage != null){
if(animation){
TransitionDrawable td = AbImageUtil.drawableToTransitionDrawable(errorImage);
imageView.setImageDrawable(td);
td.startTransition(200);
}else{
imageView.setImageDrawable(errorImage);
}
}
}
}
};
mAbImageDownloadPool.download(item);
}else{
if(loadingView != null){
loadingView.setVisibility(View.INVISIBLE);
imageView.setVisibility(View.VISIBLE);
}
imageView.setImageBitmap(item.bitmap);
}
}
/**
*
* 描述：设置下载中的图片
* @param resID
* @throws
*/
public void setLoadingImage(int resID) {
this.loadingImage = context.getResources().getDrawable(resID);
}
/**
*
* 描述：设置下载中的View，优先级高于setLoadingImage
* @param view 放在ImageView的上边或者下边的View
* @throws
*/
public void setLoadingView(View view) {
this.loadingView = view;
}
/**
*
* 描述：设置下载失败的图片
* @param resID
* @throws
*/
public void setErrorImage(int resID) {
this.errorImage = context.getResources().getDrawable(resID);
}
/**
*
* 描述：设置未找到的图片
* @param resID
* @throws
*/
public void setNoImage(int resID) {
this.noImage = context.getResources().getDrawable(resID);
}
public int getWidth() {
return width;
}
/**
*
* 描述：设置图片的宽度
* @param height
* @throws
*/
public void setWidth(int width) {
this.width = width;
}
public int getHeight() {
return height;
}
/**
*
* 描述：设置图片的高度
* @param height
* @throws
*/
public void setHeight(int height) {
this.height = height;
}
public int getType() {
return type;
}
/**
*
* 描述：图片的处理类型（剪切或者缩放到指定大小，参考AbConstant类）.
* @param type
* @throws
*/
public void setType(int type) {
this.type = type;
}
/**
*
* 描述：是否开启动画.
* @param animation
* @throws
*/
public void setAnimation(boolean animation) {
this.animation = animation;
}
}