Android(安卓)网易云音乐图片高斯模糊

Android 背景图流行使用高斯模糊效果，界面效果会比较好看。分析各种实现方式，实现网易云音乐图片加载高斯模糊背景。

注意：请更新 fresco 版本，内部已实现 BlurPostProcessor

使用方式如下：

ImageRequest request = ImageRequestBuilder.newBuilderWithSource(Uri.parse(SINGER_URL))        .setPostprocessor(new BlurPostProcessor(10, this, 1))        .build();PipelineDraweeController controller = (PipelineDraweeController)Fresco.newDraweeControllerBuilder()        .setImageRequest(request)        .setOldController(mBlurView.getController())        .build();mBlurView.setController(controller);

源码：android-fresco-blur

高斯模糊实现方式

JavaBlur
NativeBlur
RenderScriptBlur

选择合适的模糊技术

性能分析直接参考 Android高级模糊技术，结合实际开发情况，本文只针对 NativeBlur 结合 Fresco 图片修改 BasePostprocessor 实现高斯模糊。

代码实践

FastBlurPostprocessor 实现对图片的高斯模糊处理

package com.android.blur;import android.graphics.Bitmap;import com.enrique.stackblur.NativeBlurProcess;import com.facebook.imagepipeline.request.BasePostprocessor;public class FastBlurPostprocessor extends BasePostprocessor {        private float mRadius;        public FastBlurPostprocessor(float blurRadius) {        this.mRadius = blurRadius;    }    public void process(Bitmap bitmap) {        try {            bitmap.setHasAlpha(true);            NativeBlurProcess blur = new NativeBlurProcess();            blur.blur(bitmap, mRadius);        } catch (Exception e) {            e.printStackTrace();        }    }    public String getName() {        return "FastBlurPostprocessor";    }}

修改图片

ImageRequest request = ImageRequestBuilder.newBuilderWithSource(Uri.parse(SINGER_URL))        .setPostprocessor(new FastBlurPostprocessor(60f))        .build();PipelineDraweeController controller = (PipelineDraweeController)Fresco.newDraweeControllerBuilder().setImageRequest(request)        .setOldController(mBlurView.getController())        .build();mBlurView.setController(controller);

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