Android圓形的Imageview

Android圓形的Imageview

網上找的圓形imageview自訂控制項：‘

package com.wangll.widget;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.PaintFlagsDrawFilter;import android.graphics.PorterDuff.Mode;import android.graphics.PorterDuffXfermode;import android.graphics.Rect;import android.graphics.RectF;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.util.AttributeSet;import android.widget.ImageView;/** * 圓形的Imageview *  * @author wangll *  */public class CircularImage extends ImageView {    public CircularImage(Context context) {        super(context);    }    public CircularImage(Context context, AttributeSet attrs) {        super(context, attrs);    }    public CircularImage(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);    }    @Override    protected void onDraw(Canvas canvas) {        Drawable drawable = getDrawable();        if (null != drawable) {            Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();            if (null != bitmap) {                Bitmap b = toRoundCorner(bitmap);                Paint paint = new Paint();                paint.setAntiAlias(true);                paint.setFilterBitmap(true);                canvas.drawBitmap(b, new Rect(0, 0, b.getWidth(), b.getHeight()),                        new Rect(0, 0, this.getWidth(), this.getHeight()), paint);            }        } else {            super.onDraw(canvas);        }    }    private Bitmap toRoundCorner(Bitmap bitmap) {        Bitmap outBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);        final Paint paint = new Paint();        paint.setAntiAlias(true);        paint.setFilterBitmap(true);        paint.setColor(0xffffffff);        final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());        final RectF rectF = new RectF(rect);        final float roundPX = bitmap.getWidth() / 2 < bitmap.getHeight() / 2 ? bitmap.getWidth() : bitmap.getHeight();        Canvas canvas = new Canvas(outBitmap);        canvas.drawARGB(0, 0, 0, 0);        canvas.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG));        canvas.drawRoundRect(rectF, roundPX, roundPX, paint);        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));        canvas.drawBitmap(bitmap, rect, rect, paint);        return outBitmap;    }}

xml中直接用

圖片效果：