android中图片倒影、圆角效果重绘

本文用来记录一些android 操作图片的方法，方便查看。

1.将Drawable转化为Bitmap

public static Bitmap drawableToBitmap(Drawable drawable){  int width = drawable.getIntrinsicWidth();  int height = drawable.getIntrinsicHeight();  Bitmap bitmap = Bitmap.createBitmap(width, height,  drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888  : Bitmap.Config.RGB_565);  Canvas canvas = new Canvas(bitmap);  drawable.setBounds(0,0,width,height);  drawable.draw(canvas);  return bitmap;  }

2.获得圆角图片的方法

public static Bitmap getRoundedCornerBitmap(Bitmap bitmap,float roundPx){   Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap  .getHeight(), Config.ARGB_8888);  Canvas canvas = new Canvas(output);   final int color = 0xff424242;  final Paint paint = new Paint();  final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());  final RectF rectF = new RectF(rect);   paint.setAntiAlias(true);  canvas.drawARGB(0, 0, 0, 0);  paint.setColor(color);  canvas.drawRoundRect(rectF, roundPx, roundPx, paint);   paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));  canvas.drawBitmap(bitmap, rect, rect, paint);   return output;  }

3.获得带倒影的图片方法

public static Bitmap createReflectionImageWithOrigin(Bitmap bitmap){ final int reflectionGap = 4; int width = bitmap.getWidth(); int height = bitmap.getHeight(); Matrix matrix = new Matrix(); matrix.preScale(1, -1); Bitmap reflectionImage = Bitmap.createBitmap(bitmap, , height/2, width, height/2, matrix, false); Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height/2), Config.ARGB_8888); Canvas canvas = new Canvas(bitmapWithReflection); canvas.drawBitmap(bitmap, 0, 0, null); Paint deafalutPaint = new Paint(); canvas.drawRect(0, height,width,height + reflectionGap, deafalutPaint); canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null); Paint paint = new Paint(); LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0, bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP); paint.setShader(shader); //importantpaint.setXfermode(new PorterDuffXfermode(Mode.DST_IN)); canvas.drawRect(0, height, width, bitmapWithReflection.getHeight() + reflectionGap, paint); return bitmapWithReflection; }

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