Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);

Bitmap bitmap;

MaskFilter normalMaskFilter = new BlurMaskFilter(50, BlurMaskFilter.Blur.NORMAL);

MaskFilter innerMaskFilter = new BlurMaskFilter(50, BlurMaskFilter.Blur.INNER);

MaskFilter outerMaskFilter = new BlurMaskFilter(50, BlurMaskFilter.Blur.OUTER);

MaskFilter solidMaskFilter = new BlurMaskFilter(50, BlurMaskFilter.Blur.SOLID);

public Practice14MaskFilterView(Context context) {

super(context);

}

public Practice14MaskFilterView(Context context, @Nullable AttributeSet attrs) {

super(context, attrs);

}

public Practice14MaskFilterView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {

super(context, attrs, defStyleAttr);

}

{

setLayerType(LAYER_TYPE_SOFTWARE, null);

bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.what_the_fuck);

}

@Override

protected void onDraw(Canvas canvas) {

super.onDraw(canvas);

// 用 Paint.setMaskFilter 来设置不同的 BlurMaskFilter

// 第一个：NORMAL 内外都模糊绘制

paint.setMaskFilter(normalMaskFilter);

canvas.drawBitmap(bitmap, 100, 50, paint);

// 第二个：INNER 内部模糊，外部不绘制

paint.setMaskFilter(innerMaskFilter);

canvas.drawBitmap(bitmap, bitmap.getWidth() + 200, 50, paint);

// 第三个：OUTER 内部不绘制，外部模糊

paint.setMaskFilter(outerMaskFilter);

canvas.drawBitmap(bitmap, 100, bitmap.getHeight() + 100, paint);

// 第四个：SOLID 内部正常绘制，外部模糊

paint.setMaskFilter(solidMaskFilter);

canvas.drawBitmap(bitmap, bitmap.getWidth() + 200, bitmap.getHeight() + 100, paint);

}