Android 圆形头像+渐变+白框

先上效果：

代码：

public class CircleImageView extends ImageView {    private Context context ;    private int radius = 0 ;    private int defaultWidth = 0 , defaultHeight = 0 ;    public CircleImageView(Context context) {        super(context);        init(context);    }    public CircleImageView(Context context, @Nullable AttributeSet attrs) {        super(context, attrs);        init(context);    }    public CircleImageView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init(context);    }    private void init(Context context){        this.context=context;    }

    @Override    protected void onDraw(Canvas canvas) {        //获取图片        Drawable drawable = getDrawable() ;        //如果图片为空，直接放返回        if (drawable == null)            return;        //如果控件的宽高其中一个为0，直接返回        if (getWidth() == 0 || getHeight() == 0)            return;        this.measure(0, 0);        //如果是.9图也无法显示，直接返回        if(drawable.getClass() == NinePatchDrawable.class)            return;        Bitmap b = ((BitmapDrawable) drawable).getBitmap();        Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);        //获取控件的宽高        if (defaultWidth == 0) {            defaultWidth = getWidth();        }        if (defaultHeight == 0) {            defaultHeight = getHeight();        }        //半径的等于宽高中较小的一边的一半        radius = (defaultHeight > defaultWidth ? defaultWidth :defaultHeight )/2;        Bitmap squareBitmap= Bitmap.createScaledBitmap(bitmap,radius*2,radius*2,false);        Bitmap roundBitmap = toRoundBitmap(squareBitmap);        //以控件的中心为中心画出图片        canvas.drawBitmap(roundBitmap, defaultWidth / 2 - radius, defaultHeight / 2 - radius, null);    }    /**     * 先画头像边缘的渐变     * */    public void JianBian(Paint paint,int j,int k){        RadialGradient gradient = new RadialGradient(j/2,k/2,j/2,new int[]{0xff5d5d5d,0xff5d5d5d,0x00ffffff},new float[]{0.f,0.8f,1.0f}, Shader.TileMode.CLAMP);        paint.setShader(gradient);    }    /**     * 转换图片成圆形     * @param bitmap 传入Bitmap对象     * @return     */    public Bitmap toRoundBitmap(Bitmap bitmap)    {        Paint paint = new Paint();        int width = bitmap.getWidth();        int height = bitmap.getHeight();        float roundPx;        float left,top,right,bottom,dst_left,dst_top,dst_right,dst_bottom;        paint.setAntiAlias(true);        JianBian(paint,width,height);        if (width <= height) {            roundPx = width / 2 ;            top = 0;            bottom = width;            left = 0;            right = width;            height = width;            dst_left = 0;            dst_top = 0;            dst_right = width;            dst_bottom = width;            Log.i ("111111","111111" );        } else {            roundPx = height / 2 ;            float clip = (width - height) / 2;            left = clip;            right = width - clip;            top = 0;            bottom = height;            width = height;            dst_left = 0;            dst_top = 0;            dst_right = height;            dst_bottom = height;            Log.i ("111111","22222" );        }        Bitmap output = Bitmap.createBitmap(width,                height, Bitmap.Config.ARGB_8888);        Canvas canvas = new Canvas(output);        final int color = 0xff424242;        final Rect src = new Rect((int)left, (int)top, (int)right, (int)bottom);        final Rect dst = new Rect((int)dst_left, (int)dst_top, (int)dst_right, (int)dst_bottom);        final RectF rectF = new RectF(dst_left-5              //图片对应imageview的左边距                , dst_top-5                                   //图片对应imageview的上边距                , dst_right                                   //图片对应imageview的右边距                , dst_bottom                                  //图片对应imageview的下边距        );        canvas.drawARGB(0, 0, 0, 0);        paint.setColor(color);        canvas.drawRoundRect(rectF, roundPx, roundPx, paint);        paint.setXfermode(new PorterDuffXfermode ( PorterDuff.Mode.SRC_IN));        canvas.drawBitmap(bitmap, src, dst, paint);        Log.i ("111111","33333" );        //BaiBian ( canvas,dst_right,dst_bottom );        return output;    }    /**     * 最后画上白边     *     *     * */    public void BaiBian(Canvas canvas,float j,float k){        Paint paint = new Paint();        paint.setColor(context.getResources().getColor(R.color.border));        paint.setAntiAlias(true);        paint.setStrokeWidth(2);        paint.setStyle(Paint.Style.STROKE);        canvas.drawCircle(j/2     //左右位置                ,k/2              //上下位置                ,j/2-2            //半径大小                ,paint);    }}