android 中bitmap 缩放和阴影效果

1.缩放

/**
* zoom bitmap to certain size
*
* @param bitmap
* @param width
* @param height
* @return
*/
public static Bitmap zoomBitmap(Bitmap bitmap, int width, int height) {
if (bitmap == null) {
return null;
}

int w = bitmap.getWidth();
int h = bitmap.getHeight();
Matrix matrix = new Matrix();
float scaleWidth = ((float) width / w);
float scaleHeight = ((float) height / h);
matrix.postScale(scaleWidth, scaleHeight);
Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, w, h, matrix, true);
return newbmp;
}

2. 阴影

/**

* add shadow to bitmap
*
* @param originalBitmap
* @return
*/
private Bitmap drawImageDropShadow(Bitmap originalBitmap) {

BlurMaskFilter blurFilter = new BlurMaskFilter(1,
BlurMaskFilter.Blur.NORMAL);
Paint shadowPaint = new Paint();
shadowPaint.setAlpha(50);
shadowPaint.setColor(activity.getResources()
.getColor(R.color.solid_red));
shadowPaint.setMaskFilter(blurFilter);

int[] offsetXY = new int[2];
Bitmap shadowBitmap = originalBitmap
.extractAlpha(shadowPaint, offsetXY);

Bitmap shadowImage32 = shadowBitmap.copy(Bitmap.Config.ARGB_8888, true);
Canvas c = new Canvas(shadowImage32);
c.drawBitmap(originalBitmap, offsetXY[0], offsetXY[1], null);

return shadowImage32;
}

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