Glide加载圆角gif 和圆角图片的三种方法

直接上代码： 看注解
@SuppressLint("AppCompatCustomView")
public class MyTestImageView extends ImageView {

    private float width;
    private float height;
    private float radius;
    private Paint paint;
    private Matrix matrix;

    public MyTestImageView(Context context) {
        this(context, null);
    }

    public MyTestImageView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        paint = new Paint();
        paint.setAntiAlias(true);
        matrix = new Matrix();
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        width = getMeasuredWidth();
        height = getMeasuredHeight();
        radius = DensityUtils.dpForPx(3);
    }

    @SuppressLint("DrawAllocation")
    @Override
    protected void onDraw(Canvas canvas) {

// 第三种就直接用 PorterDuffXfermode 去交集 DST_IN 来得倒 交集的后 gif 图片展示 
//加这个是为了隔离图层，避免黑色的底边
        int layerID = canvas.saveLayer(0, 0, width, height, paint, Canvas.ALL_SAVE_FLAG);        @SuppressLint("DrawAllocation") RectF f1 = new RectF(0.0f, 0.0f, width, height);
        @SuppressLint("DrawAllocation") Path ra = new Path();
        ra.addRoundRect(f1, radius, radius, Path.Direction.CCW);
        paint.setColor(ContextCompat.getColor(this.getContext(), R.color.color_fff));
        //        canvas.clipPath(ra);//第一种 直接裁剪画布，根据实践有锯齿
        super.onDraw(canvas);
        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));
        canvas.drawPath(ra, paint);
        paint.setXfermode(null);
//回复图层
       canvas.restoreToCount(layerID);// 第二种 给imageview 加相框 不过得适配画笔颜色和布局背景颜色一样。
//        Drawable drawable = getDrawable();
//        if (null != drawable) {
//            @SuppressLint("DrawAllocation")
//            RectF f = new RectF(0.0f, 0.0f, width, height);
//            @SuppressLint("DrawAllocation") Path now = new Path();
//            @SuppressLint("DrawAllocation") Path bg = new Path();
//            bg.addRect(f, Path.Direction.CCW);
//            now.addRoundRect(f, radius, radius, Path.Direction.CCW);
//            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT)
//                now.op(bg, now, Path.Op.DIFFERENCE);
//            canvas.drawPath(now, paint);
//        }
    }
}