Android 开发：glide圆角，圆形，效率问题

原创

王二蛋和他的张大花 2022-03-03 11:36:12 ©著作权

文章标签 ide 百度圆角 文章分类 代码人生

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本篇文章其实并不应该出现！【捂脸哭】

看过这篇文章的建议测试一下，本文中的示例，顺便对比其他百度到的示例。

写这篇文章的原因如下：

1.目前能百度到的glide圆角，圆形方案都是错误的

2.实际上glide在后续的新版本里提供了圆角圆形方案。

刚开始我在做项目的时候，采用了百度到的方案，结果发现百度到的代码效率极差，尤其是在做recycleView的时候，展示图片慢成狗。

于是我重新研究了glide代码，以及官方文档。

注：以下示例

圆形：

public class GlideCircleTransform extends BitmapTransformation {

    private static final String ID = "com.xiaohe.www.lib.tools.glide.GlideCircleTransform";

    private static final byte[] ID_BYTES = ID.getBytes(CHARSET);

    @Override

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

        int size = Math.min(toTransform.getWidth(), toTransform.getHeight());

        int x = (toTransform.getWidth() - size) / 2;

        int y = (toTransform.getHeight() - size) / 2;

        Bitmap square = Bitmap.createBitmap(toTransform, x, y, size, size);

        Bitmap circle = pool.get(size, size, Bitmap.Config.ARGB_8888);

        Canvas canvas = new Canvas(circle);

        Paint paint = new Paint();

        paint.setShader(new BitmapShader(square, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));

        paint.setAntiAlias(true);

        float r = size / 2f;

        canvas.drawCircle(r, r, r, paint);

        return circle;

    }

    @Override

    public boolean equals(Object obj) {

        return obj instanceof GlideCircleTransform;

    }

    @Override

    public int hashCode() {

        return ID.hashCode();

    }

    @Override

    public void updateDiskCacheKey(@NonNull MessageDigest messageDigest) {

        messageDigest.update(ID_BYTES);

    }

}

圆角：

public class GlideRoundTransform  extends BitmapTransformation {

    private static final String ID = "com.xiaohe.www.lib.tools.glide.GlideRoundTransform";

    private static final byte[] ID_BYTES = ID.getBytes(CHARSET);

    private int radius;

    public GlideRoundTransform(Context context, int radius) {

        this.radius = UUi.dp2px(radius);

    }

    @Override

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

        int width = toTransform.getWidth();

        int height = toTransform.getHeight();

        Bitmap bitmap = pool.get(width, height, Bitmap.Config.ARGB_8888);

        bitmap.setHasAlpha(true);

        Canvas canvas = new Canvas(bitmap);

        Paint paint = new Paint();

        paint.setAntiAlias(true);

        paint.setShader(new BitmapShader(toTransform, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));

        canvas.drawRoundRect(new RectF(0, 0, width, height), radius, radius, paint);

        return bitmap;

    }

    @Override

    public boolean equals(Object obj) {

        if (obj instanceof GlideRoundTransform) {

            GlideRoundTransform other = (GlideRoundTransform) obj;

            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(radius).array();

        messageDigest.update(radiusData);

    }

}