自定义圆角带边框ImageView

最近项目改版需要带阴影的圆角矩形，最后只实现了带边框的圆角矩形，阴影需要渐变，由于宝宝经验有限，只能参考被人的实现成了这样的。有路过的大神可以留下脚印，嘿嘿

import android.content.Context;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.PorterDuff;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;import com.trthi.mall.R;/** * 圆角带边框矩形ImageView */public class RectangleView extends ImageView {    private Paint paint;    private  Bitmap sbmp;    private float left;    private float top;    private float right;    private float bottom;    public RectangleView(Context context) {        this(context, null);    }    public RectangleView(Context context, AttributeSet attrs) {        this(context, attrs,0);    }    public RectangleView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        paint = new Paint();    }    protected void onDraw(Canvas canvas) {        int roundPx = 10;//圆角的大小，这个单位是像素        paint.setAntiAlias(true);        paint.setColor(getResources().getColor(R.color.text_color_0c66666)); //这里的颜色决定了边缘的颜色        Drawable drawable = getDrawable();        if (drawable == null) {            return;        }        if (getWidth() == 0 || getHeight() == 0) {            return;        }        if(drawable instanceof BitmapDrawable){            Bitmap b = ((BitmapDrawable) drawable).getBitmap();            Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);            int w = getWidth();            int h = getHeight();            RectF rectF = new RectF(0, 0, w, h);            Bitmap roundBitmap = getCroppedBitmap(bitmap, w, h,roundPx);            canvas.drawARGB(0, 0, 0, 0);            canvas.drawRoundRect(rectF, roundPx, roundPx, paint);            canvas.drawBitmap(roundBitmap, 0, 0, null);        }    }    public Bitmap getCroppedBitmap(Bitmap bmp, int lengthx, int lengthy,int roundPx) {        if (bmp.getWidth() != lengthx || bmp.getHeight() != lengthy)            sbmp = Bitmap.createScaledBitmap(bmp, lengthx, lengthy, false);        else            sbmp = bmp;        Bitmap output = Bitmap.createBitmap(sbmp.getWidth(), sbmp.getHeight(), Bitmap.Config.ARGB_8888);        Canvas canvas = new Canvas(output);        final Rect rect = new Rect(0, 0, sbmp.getWidth(), sbmp.getHeight());        //left、right -:向右 +:向左   top、bottom -:向下 +:向上        final RectF rectF = new RectF(left,top,sbmp.getWidth()+right,sbmp.getHeight()+bottom);//        final RectF rectF = new RectF(-3, 0, sbmp.getWidth()+3, sbmp.getHeight() - 2);        final Paint paint = new Paint();        paint.setAntiAlias(true);        paint.setFilterBitmap(true);        paint.setDither(true);        canvas.drawRoundRect(rectF, roundPx, roundPx, paint);        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));        canvas.drawBitmap(sbmp, rect, rect, paint);        return output;    }    //这个方法是通过外部来控制边框的大小    public void setRectFSize(float left,float top,float right,float bottom){        this.left = left;        this.top = top;        this.right = right;        this.bottom = bottom;    }}

这里需要说明一点，给这个自定义的ImageView设置background是不起作用的，这个不也不知道为啥，所以就想到给他加一个父布局（带阴影的）来解决带阴影的圆角矩形。
我的建议，直接让设计给圆角带阴影的矩形最好，原因：一本身不用重写任何控件，减少了APP文件的大小；二节省了开发时间。但是最好还是要一起沟通和看具体需求了嘿嘿