Picasso 图片请求库(工具类)

Picasso:picasso是Square公司开源的一个Android图形缓存库,地址:
http://square.github.io/picasso/

可以实现图片下载和缓存功能。仅仅只需要一行代码就能完全实现图片的异步加载:

Picasso.with(context).load("http://i.imgur.com/DvpvklR.png").into(imageView);

Picasso讲解:

http://www.jcodecraeer.com/a/anzhuokaifa/androidkaifa/2014/0731/1639.html

下面贴出封装的工具类:

import com.example.mytoolutils.R;
import com.squareup.picasso.Picasso;
import com.squareup.picasso.Transformation;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.net.Uri;
import android.graphics.Bitmap.Config;
import android.graphics.PorterDuff.Mode;
import android.widget.ImageView;

/**
 * picasso 图片处理工具类
* 优缺点:对图片处理强大,取消已经不在视野范围的ImageView图片资源的加载(否则会导致图片错位), * 使用4.0+系统上的HTTP缓存来代替磁盘缓存;只能得到结果,不能监听图片下载过程 *
Picasso 可以与okhttp搭配 * * 如果使用Picasso同时也使用了okhttp库,那么项目运行的时候可能会报出一下异常: Picasso detected an unsupported OkHttp on the classpath 针对该情况,网上说需要引入:compile 'com.squareup.okhttp:okhttp-urlconnection:2.2.0' 即同时引入一下三个包: compile 'com.squareup.okhttp:okhttp:2.4.0' compile 'com.squareup.okhttp:okhttp-urlconnection:2.2.0' compile 'com.squareup.picasso:picasso:2.4.0' */
public class PicassoUtils { private static PicassoUtils instance; /**圆形*/ public static String PICASSO_BITMAP_SHOW_CIRCLE_TYPE="PicassoUtils_Circle_Type"; /**圆角*/ public static String PICASSO_BITMAP_SHOW_ROUND_TYPE="PicassoUtils_Round_Type"; /**正常*/ public static String PICASSO_BITMAP_SHOW_NORMAL_TYPE="PicassoUtils_Normal_Type"; public static PicassoUtils getinstance(){ if(instance==null){ synchronized (PicassoUtils.class) { if(instance==null){ instance=new PicassoUtils(); } } } return instance; } //Picasso使用的方法汇总: //Picasso.with(context).load("http://i.imgur.com/DvpvklR.png").into(imageView); //Picasso.with(context).load(url).into(view); //Picasso.with(context).load(url) .resize(50, 50).centerCrop().into(imageView) ////这里的placeholder将resource传入通过getResource.getDrawable取资源,所以可以是张图片也可以是color id //Picasso.with(context).load(url).placeholder(R.drawable.user_placeholder).error(R.drawable.user_placeholder_error).into(imageView); // // Resources, assets, files, content providers 加载图片都支持 //Picasso.with(context).load(R.drawable.landing_screen).into(imageView1); //Picasso.with(context).load("file:///android_asset/DvpvklR.png").into(imageView2); //Picasso.with(context).load(new File(...)).into(imageView3); ////这里显示notification的图片 //Picasso.with(activity).load(Data.URLS[new Random().nextInt(Data.URLS.length)]).resizeDimen(R.dimen.notification_icon_width_height, R.dimen.notification_icon_width_height).into(remoteViews, R.id.photo, NOTIFICATION_ID, notification); ////这里是通过设置tag标签,就是当前传过来的context,这样就可以根据这个context tag来pause和resume显示了 //Picasso.with(context).load(url).placeholder(R.drawable.placeholder).error(R.drawable.error).fit().tag(context).into(view); ////监听onScrollStateChanged的时候调用执行 //picasso.resumeTag(context); //picasso.pauseTag(context); //Picasso.with(context).load(contactUri).placeholder(R.drawable.contact_picture_placeholder).tag(context).into(holder.icon); /** * 加载图片通过地址 * @param context * @param path *
* String imagePath = "/mnt/sdcard/phone_pregnancy/header.png";
String imagefileUrl = Scheme.FILE.wrap(imagePath);
//图片来源于Content provider String contentprividerUrl = "content://media/external/audio/albumart/13";
//图片来源于assets // String assetsUrl = Scheme.ASSETS.wrap("image.png");
String assetsUrl = "assets://fail_image.9.png";
//图片来源于 drawable // String drawableUrl = Scheme.DRAWABLE.wrap("R.drawable.ic_launcher.png");
String drawableUrl = "drawable://" + R.drawable.ic_add;
//图片来源于 网络 String neturi = "http://ww2.sinaimg.cn/large/49aaa343jw1dgwd0qvb4pj.jpg";

* @param imageView * @param placeholderimage 占位图片 * @param errorimage 加载错误图片 * @param bitmapShowType PICASSO_BITMAP_SHOW_CIRCLE_TYPE , PICASSO_BITMAP_SHOW_ROUND_TYPE ,PICASSO_BITMAP_SHOW_NORMAL_TYPE * @param roundRadius 设置圆角半径 */ public void LoadImage(Context context,String path,ImageView imageView,int placeholderimage,int errorimage,String bitmapShowType,float roundRadius){ if(bitmapShowType.equals(PICASSO_BITMAP_SHOW_CIRCLE_TYPE)){ Picasso.with(context).load(path).placeholder(placeholderimage).error(errorimage).transform(new CircleTransform()).into(imageView); }else if(bitmapShowType.equals(PICASSO_BITMAP_SHOW_ROUND_TYPE)){ Picasso.with(context).load(path).placeholder(placeholderimage).error(errorimage).transform(new RoundTransform(roundRadius)).into(imageView); }else { Picasso.with(context).load(path).placeholder(placeholderimage).error(errorimage).into(imageView); } } /** * 加载图片本地 通过id * @param context * @param localimage R.drawable.landing_screen * @param imageView * @param bitmapShowType PICASSO_BITMAP_SHOW_CIRCLE_TYPE , PICASSO_BITMAP_SHOW_ROUND_TYPE ,PICASSO_BITMAP_SHOW_NORMAL_TYPE * @param roundRadius 设置圆角半径 */ public void LoadImage(Context context,int localimage,ImageView imageView,String bitmapShowType,float roundRadius){ if(bitmapShowType.equals(PICASSO_BITMAP_SHOW_CIRCLE_TYPE)){ Picasso.with(context).load(localimage).placeholder(R.drawable.ic_add).error(R.drawable.ic_launcher).transform(new CircleTransform()).into(imageView); }else if(bitmapShowType.equals(PICASSO_BITMAP_SHOW_ROUND_TYPE)){ Picasso.with(context).load(localimage).transform(new RoundTransform(roundRadius)).into(imageView); }else { Picasso.with(context).load(localimage).into(imageView); } } /** * 加载图片 设置宽高 图片默认居中 (centerCrop() ) * @param context * @param path * @param imageView * @param targetWidth * @param targetHeight * @param bitmapShowType PICASSO_BITMAP_SHOW_CIRCLE_TYPE , PICASSO_BITMAP_SHOW_ROUND_TYPE ,PICASSO_BITMAP_SHOW_NORMAL_TYPE * @param roundRadius 设置圆角半径 */ public void LoadImageWithWidtAndHeight(Context context,String path,ImageView imageView,int targetWidth,int targetHeight,String bitmapShowType,float roundRadius){ if(bitmapShowType.equals(PICASSO_BITMAP_SHOW_CIRCLE_TYPE)){ Picasso.with(context).load(path).resize(targetWidth, targetHeight).centerCrop().transform(new CircleTransform()).into(imageView); }else if(bitmapShowType.equals(PICASSO_BITMAP_SHOW_ROUND_TYPE)){ Picasso.with(context).load(path).resize(targetWidth, targetHeight).centerCrop().transform(new RoundTransform(roundRadius)).into(imageView); }else { Picasso.with(context).load(path).resize(targetWidth, targetHeight).centerCrop().into(imageView); } } //-------------------------------------------------- /** *设置圆形头像 */ public class CircleTransform implements Transformation { @Override public Bitmap transform(Bitmap source) { int size = Math.min(source.getWidth(), source.getHeight()); int x = (source.getWidth() - size) / 2; int y = (source.getHeight() - size) / 2; Bitmap squaredBitmap = Bitmap.createBitmap(source, x, y, size, size); if (squaredBitmap != source) { source.recycle(); } Bitmap bitmap = Bitmap.createBitmap(size, size, source.getConfig()); Canvas canvas = new Canvas(bitmap); Paint paint = new Paint(); BitmapShader shader = new BitmapShader(squaredBitmap, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP); paint.setShader(shader); paint.setAntiAlias(true); float r = size / 2f; canvas.drawCircle(r, r, r, paint); squaredBitmap.recycle(); return bitmap; } @Override public String key() { return "circle"; } } //------------------------------------------------------ /** * 绘制圆角 */ public class RoundTransform implements Transformation{ private float radius; public RoundTransform(float radius) { this.radius=radius; } @Override public String key() { return "round"; } @Override public Bitmap transform(Bitmap bitmap) { int size = Math.min(bitmap.getWidth(), bitmap.getHeight()); int x = (bitmap.getWidth() - size) / 2; int y = (bitmap.getHeight() - size) / 2; Bitmap squaredBitmap = Bitmap.createBitmap(bitmap, x, y, size, size); if (squaredBitmap != bitmap) { bitmap.recycle(); } Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888); Canvas canvas = new Canvas(output); final int color = 0xff424242; final Paint paint = new Paint(); final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight()); final RectF rectF = new RectF(rect); paint.setAntiAlias(true); canvas.drawARGB(0, 0, 0, 0); paint.setColor(color); canvas.drawRoundRect(rectF, radius, radius, paint); paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); canvas.drawBitmap(bitmap, rect, rect, paint); squaredBitmap.recycle(); return output; } } }

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