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fresco v1.5.0：https://github.com/facebook/fresco subsampling-scale-image-view v3.6.0：https://github.com/davemorrissey/subsampling-scale-image-view
在使用到fresco-helper库的Module中的build.gradle文件里，添加以下依赖：
allprojects {
repositories {
jcenter()
maven {
url 'https://dl.bintray.com/hpdx/maven/'
}
}
}
compile 'com.facebook.fresco.helper:fresco-helper:1.6.3'
初始化
Phoenix.init(this); // Context
xml布局文件
<com.facebook.drawee.view.SimpleDraweeView
android:id="@+id/sdv_1"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:actualImageScaleType="centerCrop" />
从网络加载一张图片
String url = "http://ww3.sinaimg.cn/large/610dc034jw1f6m4aj83g9j20zk1hcww3.jpg";
SimpleDraweeView simpleDraweeView = (SimpleDraweeView)findViewById(R.id.sdv_1);
Phoenix.with(simpleDraweeView).load(url);
从网络加载一张图片，按原图等比缩放显示
String url = "http://ww3.sinaimg.cn/large/610dc034jw1f6m4aj83g9j20zk1hcww3.jpg";
SimpleDraweeView simpleDraweeView = (SimpleDraweeView)findViewById(R.id.sdv_1);
Phoenix.with(simpleDraweeView)
.setControllerListener(new SingleImageControllerListener(simpleDraweeView))
.load(url);
从网络加载一张图片，想加上自己的后处理
String url = "http://ww3.sinaimg.cn/large/610dc034jw1f6m4aj83g9j20zk1hcww3.jpg";
SimpleDraweeView simpleDraweeView = (SimpleDraweeView)findViewById(R.id.sdv_1);
Phoenix.with(simpleDraweeView)
.setBasePostprocessor(new BasePostprocessor() {
@Override
public void process(Bitmap bitmap) {
// 后处理，比如做高斯模糊处理
}
}).load(url);
从本地加载一张图片
String filePath = "/sdcard/image/test.jpg";
SimpleDraweeView simpleDraweeView = (SimpleDraweeView)findViewById(R.id.sdv_1);
Phoenix.with(simpleDraweeView).load(filePath);
从res下面加载一张图片
SimpleDraweeView simpleDraweeView = (SimpleDraweeView)findViewById(R.id.sdv_1);
Phoenix.with(simpleDraweeView).load(R.drawable.meizi);
从assets下面加载一张图片
SimpleDraweeView simpleDraweeView = (SimpleDraweeView)findViewById(R.id.sdv_1);
Phoenix.with(simpleDraweeView)
.setAssets(true)
.load("qingchun.jpg");
在写布局文件xml时，我不知道要显示的图片尺寸，需要根据业务逻辑动态的设置要显示的图片的大小，可以像下面这样写：
String url = "http://ww3.sinaimg.cn/large/610dc034jw1f6m4aj83g9j20zk1hcww3.jpg";
SimpleDraweeView simpleDraweeView = (SimpleDraweeView)findViewById(R.id.sdv_1);
Phoenix.with(simpleDraweeView)
.setWidth(100)
.setHeight(100)
.load(url);
只知道要显示图片的高或者宽的值，另一个值可以从设置的比例得出
String url = "http://ww3.sinaimg.cn/large/610dc034jw1f6m4aj83g9j20zk1hcww3.jpg";
SimpleDraweeView simpleDraweeView = (SimpleDraweeView)findViewById(R.id.sdv_1);
Phoenix.with(simpleDraweeView)
.setWidth(100)
.setAspectRatio(0.6f) // w/h = 6/10
.load(url);
图片的高斯模糊处理
String url = "http://ww3.sinaimg.cn/large/610dc034jw1f6m4aj83g9j20zk1hcww3.jpg";
SimpleDraweeView simpleDraweeView = (SimpleDraweeView)findViewById(R.id.sdv_1);
Phoenix.with(simpleDraweeView)
.setNeedBlur(true)
.load(url);
加载并显示gif格式的图片
String url = "http://img4.178.com/acg1/201506/227753817857/227754566617.gif";
SimpleDraweeView simpleDraweeView = (SimpleDraweeView)findViewById(R.id.sdv_1);
Phoenix.with(simpleDraweeView)
.load(url);
加载并显示webp格式的图片
SimpleDraweeView simpleDraweeView = (SimpleDraweeView)findViewById(R.id.sdv_1);
Phoenix.with(simpleDraweeView)
.load(R.drawable.meizi_webp);
将图片资源预加载到磁盘缓存
String url = "http://ww1.sinaimg.cn/large/610dc034jw1fahy9m7xw0j20u00u042l.jpg";
Phoenix.prefetchToDiskCache(url);
将图片资源预加载到内存缓存
String url = "http://ww1.sinaimg.cn/large/610dc034jw1fahy9m7xw0j20u00u042l.jpg";
Phoenix.prefetchToBitmapCache(url);
从网络下载一张图片，下载完成后把Bitmap给我（返回的结果是在主线程）
String url = "http://feed.chujianapp.com/20161108/452ab5752287a99a1b5387e2cd849006.jpg@1080w";
Phoenix.with(context)
.setUrl(url)
.setResult(new IResult<Bitmap>() {
@Override
public void onResult(Bitmap result) {
// 在主线程
}
}).load();
从网络下载gif图片，返回Bitmap对象
String url = "http://lh-avatar.liehuozhibo.com/20170911/d7682418510c7877fd4dd6afaa1be460.jpg?x-oss-process=image/resize,w_640,h_640/quality,q_90";
Phoenix.with(GIFFirstFrameActivity.this)
.setUrl(url)
// .setWidth(DensityUtil.dipToPixels(GIFFirstFrameActivity.this, 100))
// .setHeight(DensityUtil.dipToPixels(GIFFirstFrameActivity.this, 100))
.setResult(new IResult<Bitmap>() {
@Override
public void onResult(Bitmap result) {
mImageView.setImageBitmap(result);
}
}).load();
从网络下载一张图片，下载完成后告诉我下载的图片存在哪里（返回的结果是在工作线程，非主线程）
String url = "http://feed.chujianapp.com/20161108/452ab5752287a99a1b5387e2cd849006.jpg@1080w";
String filePath = "";
Phoenix.with(context)
.setUrl(url)
.setResult(new IDownloadResult(filePath) {
@Override
public void onResult(String filePath) {
MLog.i("filePath = " + filePath);
// 在子线程，要显示到View上，需要切换到主线程
}
}).download();
大小以M为单位，目标图片宽度大于手机屏幕宽的2倍以上或者高度大于手机屏幕高的2倍以上
xml布局文件
<com.facebook.fresco.helper.LargePhotoView
android:id="@+id/image"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
从网络加载并显示
String url = "http://img5q.duitang.com/uploads/item/201402/24/20140224212510_eQRG5.thumb.700_0.jpeg";
final LargePhotoView imageView = (LargePhotoView) findViewById(R.id.image);
Phoenix.with(imageView).load(url);
设置缩放参数
imageView.setMinimumScaleType(SubsamplingScaleImageView.SCALE_TYPE_CUSTOM);
imageView.setMinScale(1.0f);
imageView.setMaxScale(2.0f);
禁用缩放功能（你可能会有这个需求）
imageView.setZoomEnabled(false);
添加各种事件处理（单击、双击、长按）
final GestureDetector gestureDetector = new GestureDetector(this, new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onSingleTapConfirmed(MotionEvent e) {
if (imageView.isReady()) {
PointF sCoord = imageView.viewToSourceCoord(e.getX(), e.getY());
MLog.i("单击: " + ((int) sCoord.x) + ", " + ((int) sCoord.y));
} else {
MLog.i("onSingleTapConfirmed onError");
}
return false;
}
@Override
public void onLongPress(MotionEvent e) {
if (imageView.isReady()) {
PointF sCoord = imageView.viewToSourceCoord(e.getX(), e.getY());
MLog.i("长按: " + ((int) sCoord.x) + ", " + ((int) sCoord.y));
} else {
MLog.i("onLongPress onError");
}
}
@Override
public boolean onDoubleTap(MotionEvent e) {
if (imageView.isReady()) {
PointF sCoord = imageView.viewToSourceCoord(e.getX(), e.getY());
MLog.i("双击: " + ((int) sCoord.x) + ", " + ((int) sCoord.y));
} else {
MLog.i("onDoubleTap onError");
}
return false;
}
});
imageView.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
return gestureDetector.onTouchEvent(motionEvent);
}
});
从网络加载，存放到指定的缓存目录并显示
String fileCacheDir = getCacheDir().getAbsolutePath();
MLog.i("fileCacheDir = " + fileCacheDir);
Phoenix.with(imageView)
.setDiskCacheDir(fileCacheDir)
.load(url);
加载本地资源并显示
imageView.setImage(ImageSource.asset("qmsht.jpg"));
imageView.setImage(ImageSource.resource(R.drawable.monkey));
imageView.setImage(ImageSource.uri("/storage/emulated/0/fresco-helper/Download/Images/20140224212510_eQRG5.thumb.700_0.jpeg"));
imageView.setImage(ImageSource.bitmap(bitmap));
1、可以使用Fresco内置的OKHttp3 v3.6.0
compile 'com.facebook.fresco:imagepipeline-okhttp3:1.3.0'
2、在项目中已经使用OKHttp3作为网络请求库，想让图片加载库网络请求，使用与项目中一致的版本
compile 'com.squareup.okhttp3:okhttp:3.8.0'
3、新建类继承ImageLoaderConfig类
package com.android.fresco.demo.config;
import android.content.Context;
import com.android.fresco.demo.okhttp3.OkHttpImagePipelineConfigFactory;
import com.facebook.fresco.helper.config.ImageLoaderConfig;
import com.facebook.imagepipeline.core.ImagePipelineConfig;
import okhttp3.OkHttpClient;
/**
* Created by android_ls on 2017/6/12.
*/
public class PhoenixConfig extends ImageLoaderConfig {
private static PhoenixConfig sImageLoaderConfig;
protected PhoenixConfig(Context context) {
super(context);
}
public static PhoenixConfig get(Context context) {
if (sImageLoaderConfig == null) {
synchronized (PhoenixConfig.class) {
if (sImageLoaderConfig == null) {
sImageLoaderConfig = new PhoenixConfig(context);
}
}
}
return sImageLoaderConfig;
}
/**
* 使用OKHttp3替换原有的网络请求
* @return
*/
@Override
protected ImagePipelineConfig.Builder createConfigBuilder() {
OkHttpClient okHttpClient = new OkHttpClient.Builder()
.retryOnConnectionFailure(false)
.build();
return OkHttpImagePipelineConfigFactory.newBuilder(mContext, okHttpClient);
}
}
4、在初始化时，加入配置参数
package com.android.fresco.demo;
import android.app.Application;
import com.android.fresco.demo.config.PhoenixConfig;
import com.facebook.fresco.helper.Phoenix;
/**
* Created by android_ls on 2017/6/12.
*/
public class App extends Application {
@Override
public void onCreate() {
super.onCreate();
// init Phoenix
Phoenix.init(this, PhoenixConfig.get(this).getImagePipelineConfig());
}
}
5、另外说句，目前ImageLoaderConfig是支持自定义配置的。
获取已占用磁盘缓存的大小，已B为单位
long cacheSize = Phoenix.getMainDiskStorageCacheSize();
MLog.i("cacheSize = " + cacheSize);
从内存缓存中移除指定图片的缓存
String url = "http://ww1.sinaimg.cn/large/610dc034jw1fahy9m7xw0j20u00u042l.jpg";
Phoenix.evictFromMemoryCache(url);
从磁盘缓存中移除指定图片的缓存
String url = "http://ww1.sinaimg.cn/large/610dc034jw1fahy9m7xw0j20u00u042l.jpg";
Phoenix.evictFromDiskCache(url);
移除指定图片的所有缓存（包括内存+磁盘）
String url = "http://ww1.sinaimg.cn/large/610dc034jw1fahy9m7xw0j20u00u042l.jpg";
Phoenix.evictFromCache(url);
清空所有内存缓存
Phoenix.clearMemoryCaches();
清空所有磁盘缓存
Phoenix.clearDiskCaches();
清除所有缓存（包括内存+磁盘）
Phoenix.clearCaches();
与之配套的浏览大图，若需要可以试试我的这个开源库fresco-photoview
更详细的讲解，请查阅我的这篇博客：Android图片加载神器之Fresco，基于各种使用场景的讲解。
在使用过程中有满足不了的使用场景或遇到bug，欢迎提issuse ! 若你觉得还不错，请点Star, 谢谢！