Android中通过反射实现圆角ImageView代码实例

概述privatevoidinit(){paint=newPaint(Paint.ANTI_ALIAS_FLAG);roundRect=newRectF(0,getWidth(),getHeight());

private voID init(){    paint = new Paint(Paint.ANTI_AliAS_FLAG);        roundRect = new RectF(0,getWIDth(),getHeight());    radius = 40;    mPorterDuffXfermode = new PorterDuffXfermode(PorterDuff.Mode.SRC_IN) ;  }

继承ImageVIEw，在构造方法中调用，初始化Paint和Xfermode。

 protected voID onDraw(Canvas canvas) {        int sc = canvas.saveLayer(0,getHeight(),null,Canvas.MATRIX_SAVE_FLAG |        Canvas.CliP_SAVE_FLAG |        Canvas.HAS_Alpha_LAYER_SAVE_FLAG |        Canvas.FulL_color_LAYER_SAVE_FLAG |        Canvas.CliP_TO_LAYER_SAVE_FLAG);        roundRect.set(0,getHeight());    canvas.drawRoundRect(roundRect,radius,paint);        reflectSetXfermod();        super.onDraw(canvas);        canvas.restoretoCount(sc);  }

重写ImageVIEw的onDraw方法，通过xfermode实现圆角

private voID reflectSetXfermod(){    Drawable drawable = getDrawable();    if(drawable == null){      return;    }            Class bsClass = null;    Class[] innerClasses = BitmapDrawable.class.getDeclaredClasses();    for(Class innerClass :innerClasses)    {      String name = innerClass.getname();      System.out.println("-----innerClass---"+name);      if(name.equals("androID.graphics.drawable.BitmapDrawable$BitmapState"))      {        bsClass = innerClass;      }          }        if(bsClass!= null){            try {        FIEld mPaintFIEld = bsClass.getDeclaredFIEld("mPaint");        mPaintFIEld.setAccessible(true);        ConstantState constantState = ((BitmapDrawable)drawable).getConstantState();        Paint paint = (Paint)mPaintFIEld.get(constantState);        paint.setXfermode(mPorterDuffXfermode);      } catch (IllegalArgumentException e) {        // Todo auto-generated catch block        e.printstacktrace();      } catch (illegalaccessexception e) {        // Todo auto-generated catch block        e.printstacktrace();      } catch (NoSuchFIEldException e) {        // Todo auto-generated catch block        e.printstacktrace();      }    }  }

通过反射的方法将xfermode设置到BitmapDrawable 里面的内部类BitmapState里的对象mPaint，用来绘制图片。

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