本文介绍Glide通过Transform转换圆形图片和圆角图片

1、圆形转换器

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public class GlideCircleTransform extends BitmapTransformation {
    public GlideCircleTransform(Context context) {
        super(context);
    }
    @Override
    protected Bitmap transform(BitmapPool pool, 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;
        // TODO this could be acquired from the pool too
        Bitmap squared = Bitmap.createBitmap(source, x, y, size, size);
        Bitmap result = pool.get(size, size, Bitmap.Config.ARGB_8888);
        if (result == null) {
            result = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
        }
        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 String getId() {
        return getClass().getName();
    }
}

使用

Glide.with(context).load(url)
.placeholder(R.drawable.def_header)
.transform(new GlideCircleTransform(context))
.into(view);

2、圆角转换器

可以传参设置圆角的角度,不传默认4

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public class GlideRoundTransform extends BitmapTransformation {
    private static float radius = 0f;
    public GlideRoundTransform(Context context)
    {
        this(context, 4);
    }
    public GlideRoundTransform(Context context, int dp)
    {
        super(context);
        this.radius = Resources.getSystem().getDisplayMetrics().density * dp;
    }
    @Override
    protected Bitmap transform(BitmapPool pool, Bitmap toTransform, int outWidth, int outHeight)
    {
        return roundCrop(pool, toTransform);
    }
    private static Bitmap roundCrop(BitmapPool pool, Bitmap source)
    {
        if (source == null) return null;
        Bitmap result = pool.get(source.getWidth(), source.getHeight(), Bitmap.Config.ARGB_8888);
        if (result == null) {
            result = Bitmap.createBitmap(source.getWidth(), source.getHeight(), Bitmap.Config.ARGB_8888);
        }
        Canvas canvas = new Canvas(result);
        Paint paint = new Paint();
        paint.setShader(new BitmapShader(source, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));
        paint.setAntiAlias(true);
        RectF rectF = new RectF(0f, 0f, source.getWidth(), source.getHeight());
        canvas.drawRoundRect(rectF, radius, radius, paint);
        return result;
    }
    @Override
    public String getId()
    {
        return getClass().getName() + Math.round(radius);
    }
}

使用

Glide.with(context).load(url)
.placeholder(R.drawable.transparent)
.transform(new GlideRoundTransform(context))
.into(view);

本文地址： http://itdais.com/2016/08/28/Glide Transform圆型图片和圆角图片/