RecycleView Gilde加载圆形Gilde加载圆角图片闪烁

这是因为没有复写

  1. equals()
  2. hashCode()
  3. updateDiskCacheKey

必需的方法

请特别注意,对于任何 Transformation 子类,包括 BitmapTransformation,你都有三个方法你 必须 实现它们,以使得磁盘和内存缓存正确地工作:

  1. equals()
  2. hashCode()
  3. updateDiskCacheKey

如果你的 Transformation 没有参数,通常使用一个包含完整包限定名的 static final String 来作为一个 ID,它可以构成 hashCode() 的基础,并可用于更新 updateDiskCacheKey() 传入的 MessageDigest。如果你的 Transformation 需要参数而且它会影响到 Bitmap 被变换的方式,它们也必须被包含到这三个方法中。

例如,Glide 的 RoundedCorners 变换接受一个 int,它决定了圆角的弧度。它的equals(), hashCode()updateDiskCacheKey 实现看起来像这样:

  @Override
  public boolean equals(Object o) {
    if (o instanceof RoundedCorners) {
      RoundedCorners other = (RoundedCorners) o;
      return roundingRadius == other.roundingRadius;
    }
    return false;
  }

  @Override
  public int hashCode() {
    return Util.hashCode(ID.hashCode(),
        Util.hashCode(roundingRadius));
  }

  @Override
  public void updateDiskCacheKey(MessageDigest messageDigest) {
    messageDigest.update(ID_BYTES);

    byte[] radiusData = ByteBuffer.allocate(4).putInt(roundingRadius).array();
    messageDigest.update(radiusData);
  }

原来的 String 仍然保留,但 roundingRadius 被包含到了三个方法中。这里,updateDiskCacheKey 方法还演示了你可以如何使用 ByteBuffer 来包含基本参数到你的 updateDiskCacheKey 实现中。

官方文档:https://muyangmin.github.io/glide-docs-cn/doc/transformations.html


/**
 * description:自定义图片转圆形类
 */
public class GlideCircleTransform extends BitmapTransformation {

    private static final String ID = "com.bumptech.glide.transformations.GlideCircleTransform";
    private final byte[] ID_ByTES= ID.getBytes(CHARSET);

    @Override
    protected Bitmap transform(@NotNull BitmapPool pool, @NotNull Bitmap toTransform, int outWidth, int outHeight) {
        return circleCrop(pool, toTransform);
    }

    private static Bitmap circleCrop(BitmapPool pool, Bitmap source) {
        if (source == null) {
            return null;
        }

        int size = Math.min(source.getWidth(), source.getHeight());
        int x = (source.getWidth() - size) / 2;
        int y = (source.getHeight() - size) / 2;

        Bitmap squared = Bitmap.createBitmap(source, x, y, size, size);

        Bitmap result = pool.get(size, size, Bitmap.Config.ARGB_8888);
        if (result == null) {
             result = pool.get(size, size, Bitmap.Config.RGB_565);
        }
//        Bitmap result = pool.get(size, size, Bitmap.Config.RGB_565);
        Canvas canvas = new Canvas(result);
        Paint paint = new Paint();
        paint.setShader(new BitmapShader(squared, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));
        paint.setAntiAlias(true);
        float r = size / 2f;
        canvas.drawCircle(r, r, r, paint);
        return result;
    }

    @Override
    public boolean equals(Object o) {
        return o instanceof GlideCircleTransform;
    }

    @Override
    public int hashCode() {
        return ID.hashCode();
    }

    @Override
    public void updateDiskCacheKey(MessageDigest messageDigest) {
        messageDigest.update(ID_ByTES);
    }
}
/**

 * description:自定义Glide圆角图片类 将图像转换为四个角有弧度的图像
 */
public class GlideRoundTransform extends BitmapTransformation {

    private final float radius;
    private final String ID = "com. bumptech.glide.transformations.GlideRoundTransform";
    private final byte[] ID_ByTES = ID.getBytes(CHARSET);

    public GlideRoundTransform(int dp) {
        this.radius = Resources.getSystem().getDisplayMetrics().density * dp;
    }

    @Override
    protected Bitmap transform(@NonNull BitmapPool pool, @NonNull Bitmap toTransform, int outWidth, int outHeight) {
        return roundCrop(pool, toTransform);
    }

    private Bitmap roundCrop(BitmapPool pool, Bitmap toTransform) {
        if (toTransform == null) {
            return null;
        }
        Bitmap result = pool.get(toTransform.getWidth(), toTransform.getHeight(), Bitmap.Config.ARGB_8888);
        if (result == null) {
            return Bitmap.createBitmap(toTransform.getWidth(), toTransform.getHeight(), Bitmap.Config.ARGB_8888);
        }

        Canvas canvas = new Canvas(result);
        Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
        paint.setShader(new BitmapShader(toTransform, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));
        RectF rectF = new RectF(0f, 0f, toTransform.getWidth(), toTransform.getHeight());
        canvas.drawRoundRect(rectF, radius, radius, paint);

        return result;
    }


    @Override
    public boolean equals(Object o) {
        if (o instanceof GlideRoundTransform) {
            GlideRoundTransform other = (GlideRoundTransform) o;
            return radius == other.radius;
        }
        return false;
    }

    @Override
    public int hashCode() {
        return Util.hashCode(ID.hashCode(),
                Util.hashCode(radius));
   }

    @Override
    public void updateDiskCacheKey(@NonNull MessageDigest messageDigest) {
        messageDigest.update(ID_ByTES);
        byte[] radiusData = ByteBuffer.allocate(4).putInt((int) radius).array();
        messageDigest.update(radiusData);
    }

}

或者直接使用 glide-transformations

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