[CircleImageView] 圆角图片 #抗锯齿 #Xfermode

CircleImageView.java

package com.open.circleimageview.widget;
 
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PaintFlagsDrawFilter;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;
 
public class CircleImageViewB extends View {
 
	public CircleImageViewB(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		init();
	}
 
	public CircleImageViewB(Context context, AttributeSet attrs) {
		super(context, attrs);
		init();
	}
 
	public CircleImageViewB(Context context) {
		super(context);
		init();
	}
 
	private Bitmap bitmap;
	private Rect bitmapRect=new Rect();
	private PaintFlagsDrawFilter pdf=new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG|Paint.FILTER_BITMAP_FLAG);
	private Paint paint = new Paint();
    {
	    paint.setStyle(Paint.Style.STROKE);
	    paint.setFlags(Paint.ANTI_ALIAS_FLAG);
	    paint.setAntiAlias(true);// 设置画笔的锯齿效果。 true是去除，大家一看效果就明白了 
    }
    private Bitmap mDstB=null;
    private PorterDuffXfermode xfermode=new PorterDuffXfermode(PorterDuff.Mode.MULTIPLY);
    
    
    private void init()
    {
    	try {
			if(android.os.Build.VERSION.SDK_INT>=11)
			{
				setLayerType(LAYER_TYPE_SOFTWARE, null);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
    }
	public void setImageBitmap(Bitmap bitmap)
	{
		this.bitmap=bitmap;
	}
 
	private Bitmap makeDst(int w, int h) 
    {
        Bitmap bm = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
        Canvas c = new Canvas(bm);
        Paint p = new Paint(Paint.ANTI_ALIAS_FLAG);
        p.setColor(Color.parseColor("#ffffffff"));   
        c.drawOval(new RectF(0, 0, w, h), p);
        return bm;
    }
	
	@Override
	protected void onDraw(Canvas canvas) {
 
		if(null==bitmap)
		{
			return;
		}
		
		if(null==mDstB)
		{
			mDstB=makeDst(getWidth(), getHeight());
		}
 
		
		bitmapRect.set(0, 0, getWidth(), getHeight());
        canvas.save();
        canvas.setDrawFilter(pdf);
        canvas.drawBitmap(mDstB, 0, 0, paint);
        paint.setXfermode(xfermode);
        canvas.drawBitmap(bitmap, null, bitmapRect, paint);
        paint.setXfermode(null);
        canvas.restore();
	}
	
}
--------------------- 
原文：https://blog.csdn.net/ZZ7ZZ7ZZ/article/details/11495517