Android项目实战（五十七）：Glide 高斯模糊效果

核心需要高斯模糊的库

compile 'jp.wasabeef:glide-transformations:2.0.1'

针对于3.7的版本

使用方法为：

//加载背景，

            Glide.with(MusicPlayerActivity.this)

                    .load(service.getImageUri())

                    .dontAnimate()

                    .error(R.drawable.no_music_rotate_img)

                    // 设置高斯模糊,模糊程度(最大25)  缩放比例

                    .bitmapTransform(new BlurTransformation(this, , ))

                    .into(allBg);

针对4.+

Glide.with(context)

                .load(url)

                .apply(RequestOptions.bitmapTransform(new BlurTransformation(,)))

                .into(view);                        

BlurTransformation 类源码：

import android.graphics.Bitmap;

import android.graphics.Canvas;

import android.graphics.Paint;

import android.support.annotation.NonNull;

import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;

import com.bumptech.glide.load.resource.bitmap.BitmapTransformation;

import java.security.MessageDigest;

import jp.wasabeef.glide.transformations.internal.FastBlur;

public class BlurTransformation extends BitmapTransformation {

    private static final int VERSION = ;

    private static final String ID = "BlurTransformation." + VERSION;

    private static int MAX_RADIUS = ;

    private static int DEFAULT_DOWN_SAMPLING = ;

    private int radius;

    private int sampling;

    public BlurTransformation() {

        this(MAX_RADIUS, DEFAULT_DOWN_SAMPLING);

    }

    public BlurTransformation(int radius) {

        this(radius, DEFAULT_DOWN_SAMPLING);

    }

    public BlurTransformation(int radius, int sampling) {

        this.radius = radius;

        this.sampling = sampling;

    }

    @Override

    protected Bitmap transform(@NonNull BitmapPool pool, @NonNull Bitmap toTransform, int outWidth, int outHeight) {

        int width = toTransform.getWidth();

        int height = toTransform.getHeight();

        int scaledWidth = width / sampling;

        int scaledHeight = height / sampling;

        Bitmap bitmap = pool.get(scaledWidth, scaledHeight, Bitmap.Config.ARGB_8888);

        Canvas canvas = new Canvas(bitmap);

        canvas.scale( / (float) sampling,  / (float) sampling);

        Paint paint = new Paint();

        paint.setFlags(Paint.FILTER_BITMAP_FLAG);

        canvas.drawBitmap(toTransform, , , paint);

        bitmap = FastBlur.blur(bitmap, radius, true);

        return bitmap;

    }

    @Override public String toString() {

        return "BlurTransformation(radius=" + radius + ", sampling=" + sampling + ")";

    }

    @Override public boolean equals(Object o) {

        return o instanceof BlurTransformation &&

                ((BlurTransformation) o).radius == radius &&

                ((BlurTransformation) o).sampling == sampling;

    }

    @Override public int hashCode() {

        return ID.hashCode() + radius *  + sampling * ;

    }

    @Override public void updateDiskCacheKey(@NonNull MessageDigest messageDigest) {

        messageDigest.update((ID + radius + sampling).getBytes(CHARSET));

    }

}