方案一：继承自ImageView

package com.chy.widget;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.PaintFlagsDrawFilter;import android.graphics.Path;import android.graphics.Region;import android.util.AttributeSet;import android.widget.ImageView;//有一个问题,当我把它放在列表项中, 然后列表上面有一个edittext用来filter, 结果发现该自定义imageview本该被edittext挡住, 结果却绘制在edittext之上//初步判断是由canvas.clipPath(path, Region.Op.REPLACE);引起的,它把第一次不存在的部分也画了//解决方案: REPLACE(覆盖) 改为 INTERSECT(交集)public class CircleImageView extends ImageView {    private Paint paint = null;    // 设置画布抗锯齿(毛边过滤)    private PaintFlagsDrawFilter pfdf = null;    private Path path = null;    public CircleImageView(Context context) {        super(context);        init(context, null);    }    public CircleImageView(Context context, AttributeSet attrs) {        super(context, attrs);        init(context, attrs);    }    public CircleImageView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init(context, attrs);    }    // public CircleImageView(Context context, AttributeSet attrs, int    // defStyleAttr, int defStyleRes) {    // super(context, attrs, defStyleAttr, defStyleRes);    // init(context, attrs);    // }    private void init(Context context, AttributeSet attrs) {        paint = new Paint();        // 透明度: 00%=FF（不透明） 100%=00（透明）        paint.setColor(Color.WHITE);        // paint.setColor(Color.parseColor("ffffffff"));        paint.setStyle(Paint.Style.STROKE);        // 解决图片拉伸后出现锯齿的两种办法: 1.画笔上设置抗锯齿 2.画布上设置抗锯齿        // http://labs.easymobi.cn/?p=3819        paint.setFlags(Paint.ANTI_ALIAS_FLAG);        paint.setAntiAlias(true);        int clearBits = 0;        int setBits = Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG;        pfdf = new PaintFlagsDrawFilter(clearBits, setBits);        //由于imageview有默认底色,如黑色,设置背景为透明是为了第一次setImageBitmap时不显示圆以外方型的默认背景色        //但是这样在中兴nubia手机上还会首先显示正方形黑色背景,然后才变圆(解决办法,先裁成圆再setImageBitmap)        setBackgroundColor(context.getResources().getColor(android.R.color.transparent));    }    @Override    protected void onDraw(Canvas canvas) {        int width = getWidth();        int height = getHeight();        // CCW: CounterClockwise(逆时针)        // CW: Clockwise(顺时针)        if (path == null) {            path = new Path();            path.addCircle(width / 2f, height / 2f, Math.min(width / 2f, height / 2f), Path.Direction.CCW);            path.close();        }//      canvas.drawCircle(width / 2f, height / 2f, Math.min(width / 2f, height / 2f), paint);        // super.onDraw里面也可能有多个canvas.save        int saveCount = canvas.save();        canvas.setDrawFilter(pfdf);        // Region.Op.REPLACE 是显示第二次的//      canvas.clipPath(path, Region.Op.REPLACE);        canvas.clipPath(path, Region.Op.INTERSECT);        super.onDraw(canvas);        canvas.restoreToCount(saveCount);    }}

方案二：继承自View

package com.chy.widget;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Matrix;import android.graphics.Paint;import android.graphics.PaintFlagsDrawFilter;import android.graphics.PorterDuff;import android.graphics.PorterDuffXfermode;import android.graphics.RectF;import android.util.AttributeSet;import android.view.View;import android.widget.ImageView.ScaleType;public class CircleView extends View {    private Paint paint = null;    private PaintFlagsDrawFilter pfdf = null;    // 在已有的图像上绘图将会在其上面添加一层新的形状, 设置这两个形状的显示方式    private PorterDuffXfermode xfermode = null;    private RectF rectf = null;    private Bitmap bitmap = null;    private Bitmap destBmp = null;    private Matrix matrix = null;    private ScaleType scaleType = ScaleType.CENTER_CROP;    public CircleView(Context context) {        super(context);        init(context, null);    }    public CircleView(Context context, AttributeSet attrs) {        super(context, attrs);        init(context, attrs);    }    public CircleView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init(context, attrs);    }    // public CircleView(Context context, AttributeSet attrs, int defStyleAttr,    // int defStyleRes) {    // super(context, attrs, defStyleAttr, defStyleRes);    // init(context, attrs);    // }    private void init(Context context, AttributeSet attrs) {        try {            if (android.os.Build.VERSION.SDK_INT >= 11) {                setLayerType(LAYER_TYPE_SOFTWARE, null);            }        } catch (Exception e) {            e.printStackTrace();        }        paint = new Paint();        paint.setStyle(Paint.Style.FILL);        paint.setColor(Color.WHITE);        // 透明度: 00%=FF（不透明） 100%=00（透明）        // paint.setColor(Color.parseColor("#ffffffff"));        // 解决图片拉伸后出现锯齿的两种办法: 1.画笔上设置抗锯齿 2.画布上设置抗锯齿        paint.setFlags(Paint.ANTI_ALIAS_FLAG);        paint.setAntiAlias(true);        int clearBits = 0;        int setBits = Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG;        pfdf = new PaintFlagsDrawFilter(clearBits, setBits);        // PorterDuff.Mode.MULTIPLY只显示重叠部分        xfermode = new PorterDuffXfermode(PorterDuff.Mode.MULTIPLY);        matrix = new Matrix();    }    public void setImageResource(int resId) {        Bitmap bmp = BitmapFactory.decodeResource(getResources(), resId);        setBitmap(bmp);    }    public void setBitmap(Bitmap bmp) {        this.bitmap = bmp;    }    public void setScaleType(ScaleType scaleType) {        this.scaleType = scaleType;    }    private void makeDestBmp(int width, int height) {        destBmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);        rectf = new RectF(0, 0, width, height);        Canvas canvas = new Canvas(destBmp);        canvas.drawOval(rectf, paint);    }    @Override    protected void onDraw(Canvas canvas) {        if (bitmap == null) {            return;        }        int width = getWidth();        int height = getHeight();        int bmpWidth = bitmap.getWidth();        int bmpHeight = bitmap.getHeight();        if (destBmp == null) {            makeDestBmp(width, height);        }        // canvas.save();        // 设置画布抗锯齿        canvas.setDrawFilter(pfdf);        canvas.drawBitmap(destBmp, 0, 0, paint);        paint.setXfermode(xfermode);        switch(scaleType) {        case FIT_XY:             canvas.drawBitmap(bitmap, null, rectf, paint);            break;        case CENTER_CROP:        default:            matrix.reset();            float scale = Math.max((float) width / (float) bmpWidth, (float) height / (float) bmpHeight);            // 默认绕原点进行缩放 matrix.postScale(scale, scale, 0, 0);            matrix.postScale(scale, scale, 0, 0);            matrix.postTranslate((width - bmpWidth * scale) / 2f, (height - bmpHeight * scale) / 2f);            canvas.drawBitmap(bitmap, matrix, paint);            break;        }        paint.setXfermode(null);        // canvas.restore();    }}

Android(安卓)两种方式实现圆形头像

方案一：继承自ImageView

方案二：继承自View

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