glide 设置圆角的时候会导致ImageView的scaleType属性无效？导致图片变形？
原因：属性覆盖了。
为什么呢，其实是因为重复调用了transform方法导致的，
比如new CenterCrop(mContext)或者是new RequestOptions().centerCrop()
public class CenterCrop extends BitmapTransformation { .... // Bitmap doesn't implement equals, so == and .equals are equivalent here. @SuppressWarnings("PMD.CompareObjectsWithEquals") @Override protected Bitmap transform( @NonNull BitmapPool pool, @NonNull Bitmap toTransform, int outWidth, int outHeight) { return TransformationUtils.centerCrop(pool, toTransform, outWidth, outHeight); } }
public RequestOptions centerCrop() { return transform(DownsampleStrategy.CENTER_OUTSIDE, new CenterCrop()); }
可以看到都有调用transform方法的，
再看一种写法
new RequestOptions().centerCrop().transform(...);
很明显重复了，centerCrop内部已经调用了transform方法，然后后面又跟了一个transform。
解决思路：既然多次调用会覆盖，那就一次调用多个属性。
自定义一个类去继承BitmapTransformation：
/** * Created by yechaoa on 2018/9/10. * Describe : glide 圆角 */ public class GlideRoundTransform extends BitmapTransformation { private static float radius = 0f; public GlideRoundTransform(int dp) { super(); radius = Resources.getSystem().getDisplayMetrics().density * dp; } @Override protected Bitmap transform(@NonNull BitmapPool pool, @NonNull Bitmap toTransform, int outWidth, int outHeight) { Bitmap bitmap = TransformationUtils.centerCrop(pool, toTransform, outWidth, outHeight); return roundCrop(pool, bitmap); } 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); 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; } public String getId() { return getClass().getName() + Math.round(radius); } @Override public void updateDiskCacheKey(MessageDigest messageDigest) { } }
调用：
参数直接传圆角的度数就行
RequestOptions options =new RequestOptions().transform(new GlideRoundTransform(5)); Glide.with(mContext).load(...).apply(options).into(...);
