Android项目实战之Glide 高斯模糊效果的实例代码

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

//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, 14, 3))
          .into(allBg);

Glide.with(context)
        .load(url)
        .apply(RequestOptions.bitmapTransform(new BlurTransformation(25,8)))
        .into(view);            

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 = 1;
  private static final String ID = "BlurTransformation." + VERSION;
  private static int MAX_RADIUS = 25;
  private static int DEFAULT_DOWN_SAMPLING = 1;
  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(1 / (float) sampling, 1 / (float) sampling);
    Paint paint = new Paint();
    paint.setFlags(Paint.FILTER_BITMAP_FLAG);
    canvas.drawBitmap(toTransform, 0, 0, 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 * 1000 + sampling * 10;
  }
  @Override public void updateDiskCacheKey(@NonNull MessageDigest messageDigest) {
    messageDigest.update((ID + radius + sampling).getBytes(CHARSET));
  }
}