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  • 设置ImageView圆角

    import android.content.Context;
    import android.graphics.Canvas;
    import android.graphics.Color;
    import android.graphics.Paint;
    import android.graphics.PorterDuff;
    import android.graphics.PorterDuffXfermode;
    import android.graphics.RectF;
    import android.util.AttributeSet;
    import android.widget.ImageView;
    
    public class RoundImageView extends ImageView {
        public RoundImageView(Context context, AttributeSet attrs) {
            super(context, attrs);
            init();
        }
    
        public RoundImageView(Context context) {
            super(context);
            init();
        }
    
        private final RectF roundRect = new RectF();
        private float rect_adius = 10;//控制圆角大小
        private final Paint maskPaint = new Paint();
        private final Paint zonePaint = new Paint();
    
        private void init() {
            maskPaint.setAntiAlias(true);
            maskPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
            //
            zonePaint.setAntiAlias(true);
            zonePaint.setColor(Color.WHITE);
            //
            float density = getResources().getDisplayMetrics().density;
            rect_adius = rect_adius * density;
        }
    
        public void setRectAdius(float adius) {
            rect_adius = adius;
            invalidate();
        }
    
        @Override
        protected void onLayout(boolean changed, int left, int top, int right,
                int bottom) {
            super.onLayout(changed, left, top, right, bottom);
            int w = getWidth();
            int h = getHeight();
            roundRect.set(0, 0, w, h);
        }
    
        @Override
        public void draw(Canvas canvas) {
            canvas.saveLayer(roundRect, zonePaint, Canvas.ALL_SAVE_FLAG);
            canvas.drawRoundRect(roundRect, rect_adius, rect_adius, zonePaint);
            //
            canvas.saveLayer(roundRect, maskPaint, Canvas.ALL_SAVE_FLAG);
            super.draw(canvas);
            canvas.restore();
        }
    
    }
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  • 原文地址:https://www.cnblogs.com/yangcong/p/4086862.html
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