XUtils开源项目---BitmapUtils图片处理

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项目地址项目地址。。。。。。。

最近搜了XUtils进行学习，该开源库是目前git上比较活跃 功能比较完善的一个框架，是基于afinal开发的，比afinal稳定性提高了不少，该框架包含

DbUtils模块：android中的orm框架，一行代码就可以进行增删改查；

ViewUtils模块：android中的ioc框架，完全注解方式就可以进行UI，资源和事件绑定。

HttpUtils模块：支持同步，异步方式的请求；支持大文件上传，上传大文件不会oom；返回文本内容的请求(默认只启用了GET请求)支持缓存

BitmapUtils模块：加载bitmap的时候无需考虑bitmap加载过程中出现的oom和android容器快速滑动时候出现的图片错位等现象；支持加载网络图片和本地图片；内存管理使用lru算法，更好的管理bitmap内存；可配置线程加载线程数量，缓存大小，缓存路径，加载显示动画等...

我讲GitHub上的demo,下载下来，这篇就先摘图片处理案例，所以这篇博客就是针对BitmapUtils进行说明的，后期在整理其他的功能--诸如HttpUtils

项目git地址https://github.com/wyouflf/xUtils

使用xUtils快速开发框架需要有以下权限：

<uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 

BitmapUtils 使用方法

BitmapUtils bitmapUtils = new BitmapUtils(this);// 加载网络图片
bitmapUtils.display(testImageView, "http://bbs.lidroid.com/static/image/common/logo.png");// 加载本地图片(路径以/开头， 绝对路径)
bitmapUtils.display(testImageView, "/sdcard/test.jpg");// 加载assets中的图片(路径以assets开头)
bitmapUtils.display(testImageView, "assets/img/wallpaper.jpg");// 使用ListView等容器展示图片时可通过PauseOnScrollListener控制滑动和快速滑动过程中时候暂停加载图片
listView.setOnScrollListener(new PauseOnScrollListener(bitmapUtils, false, true));
listView.setOnScrollListener(new PauseOnScrollListener(bitmapUtils, false, true, customListener));

开始理理项目代码

bitmap_fragment.xml首先看主页面布局--布局只有一个展示数据的ListView

<span style="font-size:14px;"><?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="fill_parent"android:layout_height="fill_parent"android:orientation="vertical" ><ListViewandroid:id="@+id/img_list"android:layout_width="fill_parent"android:layout_height="fill_parent" /></RelativeLayout></span>

bitmap_item.xml

<span style="font-size:14px;"><?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"android:orientation="vertical" ><ImageViewandroid:id="@+id/img_item"android:layout_width="wrap_content"android:layout_height="wrap_content"android:minHeight="50dp"android:minWidth="50dp" /><ProgressBarandroid:id="@+id/img_pb"style="?android:attr/progressBarStyleHorizontal"android:layout_width="fill_parent"android:layout_height="2dp" /></LinearLayout></span>

BitmapHelp这个是一个单例模式，获取BitmapUtils对象，用来操作加载网络图片

package com.example.xutilsbitmap;import android.content.Context;
import com.lidroid.xutils.BitmapUtils;public class BitmapHelp {private BitmapHelp() {}private static BitmapUtils bitmapUtils;/*** BitmapUtils不是单例的 根据需要重载多个获取实例的方法* * @param appContext*            application context* @return*/public static BitmapUtils getBitmapUtils(Context appContext) {if (bitmapUtils == null) {bitmapUtils = new BitmapUtils(appContext);}return bitmapUtils;}
}

package com.example.xutilsbitmap;import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.TransitionDrawable;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.ProgressBar;import com.lidroid.xutils.BitmapUtils;
import com.lidroid.xutils.HttpUtils;
import com.lidroid.xutils.bitmap.BitmapCommonUtils;
import com.lidroid.xutils.bitmap.BitmapDisplayConfig;
import com.lidroid.xutils.bitmap.PauseOnScrollListener;
import com.lidroid.xutils.bitmap.callback.BitmapLoadFrom;
import com.lidroid.xutils.bitmap.callback.DefaultBitmapLoadCallBack;
import com.lidroid.xutils.exception.HttpException;
import com.lidroid.xutils.http.ResponseInfo;
import com.lidroid.xutils.http.callback.RequestCallBack;
import com.lidroid.xutils.http.client.HttpRequest;public class MainActivity extends Activity {/***  获取bitmapUtils单例*/public static BitmapUtils bitmapUtils;private String[] imgSites = { "http://image.baidu.com/","http://www.22mm.cc/", "http://www.moko.cc/","http://eladies.sina.com.cn/photo/", "http://www.youzi4.com/" };private ListView imageListView;private ImageListAdapter imageListAdapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.bitmap_fragment);// 获取listView控件imageListView = (ListView) findViewById(R.id.img_list);// 获取bitmapUtils单例bitmapUtils = BitmapHelp.getBitmapUtils(this);/*** 设置默认的图片展现、加载失败的图片展现*/bitmapUtils.configDefaultLoadingImage(R.drawable.ic_launcher);bitmapUtils.configDefaultLoadFailedImage(R.drawable.bitmap);bitmapUtils.configDefaultBitmapConfig(Bitmap.Config.RGB_565);// 设置最大宽高, 不设置时根据控件属性自适应.bitmapUtils.configDefaultBitmapMaxSize(BitmapCommonUtils.getScreenSize(this).scaleDown(3));/*** 滑动时加载图片，快速滑动时不加载图片 com.lidroid.xutils.bitmap.PauseOnScrollListener.* PauseOnScrollListener(TaskHandler taskHandler, boolean pauseOnScroll,* boolean pauseOnFling)*/imageListView.setOnScrollListener(new PauseOnScrollListener(bitmapUtils, false, true));imageListAdapter = new ImageListAdapter(this);imageListView.setAdapter(imageListAdapter);// 加载url请求返回的图片连接给listview// 这里只是简单的示例，并非最佳实践，图片较多时，最好上拉加载更多...for (String url : imgSites) {loadImgList(url);}imageListView.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view,int position, long id) {Intent intent = new Intent(MainActivity.this, ImageActivity.class);intent.putExtra("url",imageListAdapter.getItem(position).toString());startActivity(intent);}});}/*** 进行网络加载 (HttpMethod method, String url, RequestCallBack<String> callBack)* */private void loadImgList(String url) {new HttpUtils().send(HttpRequest.HttpMethod.GET, url,new RequestCallBack<String>() {@Overridepublic void onSuccess(ResponseInfo<String> responseInfo) {// 得到的是已打算html内容Log.e("TAG", "" + responseInfo.result);// 通过正则来获取图片的url地址，并且添加到adapter中imageListAdapter.addSrc(getImgSrcList(responseInfo.result));// 通知listview更新数据imageListAdapter.notifyDataSetChanged();}@Overridepublic void onFailure(HttpException error, String msg) {Log.e("TAG", "加载失败。。。");}});}/*** 得到网页中图片的地址 http://image.baidu.com/*/public static List<String> getImgSrcList(String htmlStr) {List<String> pics = new ArrayList<String>();String regEx_img = "<img.*?src=\"http://(.*?).jpg\""; // 图片链接地址Pattern p_image = Pattern.compile(regEx_img, Pattern.CASE_INSENSITIVE);Matcher m_image = p_image.matcher(htmlStr);while (m_image.find()) {String src = m_image.group(1);if (src.length() < 100) {pics.add("http://" + src + ".jpg");}}return pics;}private class ImageListAdapter extends BaseAdapter {private Context mContext;private final LayoutInflater mInflater;private ArrayList<String> imgSrcList;public ImageListAdapter(Context context) {super();this.mContext = context;mInflater = LayoutInflater.from(context);imgSrcList = new ArrayList<String>();}/*** 将获取的url地址，添加进来*/public void addSrc(List<String> imgSrcList) {this.imgSrcList.addAll(imgSrcList);}@Overridepublic int getCount() {return imgSrcList.size();}@Overridepublic Object getItem(int position) {return imgSrcList.get(position);}@Overridepublic long getItemId(int i) {return i;}@Overridepublic View getView(final int position, View view, ViewGroup parent) {ImageItemHolder holder = null;if (view == null) {view = mInflater.inflate(R.layout.bitmap_item, null);holder = new ImageItemHolder();holder.imgItem = (ImageView) view.findViewById(R.id.img_item);holder.imgPb = (ProgressBar) view.findViewById(R.id.img_pb);view.setTag(holder);} else {holder = (ImageItemHolder) view.getTag();}// 初始值进度为0holder.imgPb.setProgress(0);/*** display参数 (ImageView container, String uri,* BitmapLoadCallBack<ImageView> callBack)*/bitmapUtils.display(holder.imgItem, imgSrcList.get(position),new CustomBitmapLoadCallBack(holder));return view;}}private class ImageItemHolder {private ImageView imgItem;private ProgressBar imgPb;}/*** 接口* * @author Administrator* */public class CustomBitmapLoadCallBack extendsDefaultBitmapLoadCallBack<ImageView> {private final ImageItemHolder holder;public CustomBitmapLoadCallBack(ImageItemHolder holder) {this.holder = holder;}/*** 加载过程中，进行进度展示*/@Overridepublic void onLoading(ImageView container, String uri,BitmapDisplayConfig config, long total, long current) {// 百分比展示进度this.holder.imgPb.setProgress((int) (current * 100 / total));}/*** 加载图片完毕*/@Overridepublic void onLoadCompleted(ImageView imageview, String uri,Bitmap bitmap, BitmapDisplayConfig config, BitmapLoadFrom from) {// 设置图片到listviewfadeInDisplay(imageview, bitmap);// 加载完毕，修改进度值this.holder.imgPb.setProgress(100);}}/*** 动画效果--渐变效果展示* * @param imageView* @param bitmap*/private void fadeInDisplay(ImageView imageView, Bitmap bitmap) {final TransitionDrawable transitionDrawable = new TransitionDrawable(new Drawable[] { TRANSPARENT_DRAWABLE,new BitmapDrawable(imageView.getResources(), bitmap) });imageView.setImageDrawable(transitionDrawable);transitionDrawable.startTransition(500);}private static final ColorDrawable TRANSPARENT_DRAWABLE = new ColorDrawable(android.R.color.transparent);}

image.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="match_parent"android:layout_height="match_parent"><ImageView android:id="@+id/big_img"android:layout_width="wrap_content"android:layout_height="fill_parent"android:layout_gravity="center"/></LinearLayout>

ImageActivity

package com.example.xutilsbitmap;import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.Toast;
import com.lidroid.xutils.BitmapUtils;
import com.lidroid.xutils.bitmap.BitmapCommonUtils;
import com.lidroid.xutils.bitmap.BitmapDisplayConfig;
import com.lidroid.xutils.bitmap.callback.BitmapLoadCallBack;
import com.lidroid.xutils.bitmap.callback.BitmapLoadFrom;
import com.lidroid.xutils.bitmap.callback.DefaultBitmapLoadCallBack;/*** Author: wyouflf* Date: 13-10-9* Time: 下午5:26*/
public class ImageActivity extends Activity {private ImageView bigImage;private BitmapUtils bitmapUtils;private BitmapDisplayConfig bigPicDisplayConfig;public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.image);bigImage = (ImageView) findViewById(R.id.big_img);String imgUrl = getIntent().getStringExtra("url");if (bitmapUtils == null) {bitmapUtils = BitmapHelp.getBitmapUtils(this);}bigPicDisplayConfig = new BitmapDisplayConfig();// 显示原始图片,不压缩, 尽量不要使用, 图片太大时容易OOM。//bigPicDisplayConfig.setShowOriginal(true);bigPicDisplayConfig.setBitmapConfig(Bitmap.Config.RGB_565);bigPicDisplayConfig.setBitmapMaxSize(BitmapCommonUtils.getScreenSize(this));BitmapLoadCallBack<ImageView> callback = new DefaultBitmapLoadCallBack<ImageView>() {@Overridepublic void onLoadStarted(ImageView container, String uri, BitmapDisplayConfig config) {super.onLoadStarted(container, uri, config);Toast.makeText(getApplicationContext(), uri, 300).show();}@Overridepublic void onLoadCompleted(ImageView container, String uri, Bitmap bitmap, BitmapDisplayConfig config, BitmapLoadFrom from) {super.onLoadCompleted(container, uri, bitmap, config, from);Toast.makeText(getApplicationContext(), bitmap.getWidth() + "*" + bitmap.getHeight(), 300).show();}};bitmapUtils.display(bigImage, imgUrl, bigPicDisplayConfig, callback);}
}

如下的代码是设置加载图片之前默认的显示图片，加载失败的图片，以及图片的质量参数

/*** 设置默认的图片展现、加载失败的图片展现*/bitmapUtils.configDefaultLoadingImage(R.drawable.ic_launcher);bitmapUtils.configDefaultLoadFailedImage(R.drawable.bitmap);bitmapUtils.configDefaultBitmapConfig(Bitmap.Config.RGB_565);

	/*** 进行网络加载 (HttpMethod method, String url, RequestCallBack<String> callBack)*/private void loadImgList(String url) {new HttpUtils().send(HttpRequest.HttpMethod.GET, url,new RequestCallBack<String>() {@Overridepublic void onSuccess(ResponseInfo<String> responseInfo) {// 得到的是已打算html内容Log.e("TAG", "" + responseInfo.result);// 通过正则来获取图片的url地址，并且添加到adapter中imageListAdapter.addSrc(getImgSrcList(responseInfo.result));// 通知listview更新数据imageListAdapter.notifyDataSetChanged();}@Overridepublic void onFailure(HttpException error, String msg) {Log.e("TAG", "加载失败。。。");}});}

请求完毕，json或则xml内容后，就利用下面的方法，获取图片地址，并创建集合对象--利用了正则表达式

	/*** 得到网页中图片的地址 http://image.baidu.com/*/public static List<String> getImgSrcList(String htmlStr) {List<String> pics = new ArrayList<String>();String regEx_img = "<img.*?src=\"http://(.*?).jpg\""; // 图片链接地址Pattern p_image = Pattern.compile(regEx_img, Pattern.CASE_INSENSITIVE);Matcher m_image = p_image.matcher(htmlStr);while (m_image.find()) {String src = m_image.group(1);if (src.length() < 100) {pics.add("http://" + src + ".jpg");}}return pics;}

imageListAdapter .addSrc(getImgSrcList(responseInfo.result));

	/*** 将获取的url地址，添加进来*/public void addSrc(List<String> imgSrcList) {this.imgSrcList.addAll(imgSrcList);}

在adapter里面关键的地方是

/*** display参数 (ImageView container, String uri,* BitmapLoadCallBack<ImageView> callBack)*/bitmapUtils.display(holder.imgItem, imgSrcList.get(position),new CustomBitmapLoadCallBack(holder));

	/*** 接口* * @author Administrator* */public class CustomBitmapLoadCallBack extendsDefaultBitmapLoadCallBack<ImageView> {private final ImageItemHolder holder;public CustomBitmapLoadCallBack(ImageItemHolder holder) {this.holder = holder;}/*** 加载过程中，进行进度展示*/@Overridepublic void onLoading(ImageView container, String uri,BitmapDisplayConfig config, long total, long current) {// 百分比展示进度this.holder.imgPb.setProgress((int) (current * 100 / total));}/*** 加载图片完毕*/@Overridepublic void onLoadCompleted(ImageView imageview, String uri,Bitmap bitmap, BitmapDisplayConfig config, BitmapLoadFrom from) {// 设置图片到listviewfadeInDisplay(imageview, bitmap);// 加载完毕，修改进度值this.holder.imgPb.setProgress(100);}}

这个是用的一个渐变的效果代码如下

/*** 动画效果--渐变效果展示* * @param imageView* @param bitmap*/private void fadeInDisplay(ImageView imageView, Bitmap bitmap) {final TransitionDrawable transitionDrawable = new TransitionDrawable(new Drawable[] { TRANSPARENT_DRAWABLE,new BitmapDrawable(imageView.getResources(), bitmap) });imageView.setImageDrawable(transitionDrawable);transitionDrawable.startTransition(500);}private static final ColorDrawable TRANSPARENT_DRAWABLE = new ColorDrawable(android.R.color.transparent);

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