直播源码搭建教程,如何通过图片获取指定大小的bitmap
直播源码搭建教程,如何通过图片获取指定大小的bitmap
一般通过图片获取其Bitmap的方法如下
Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.drawable.head); int width = bitmap.getWidth(); int height = bitmap.getHeight(); System.out.println("Bitmap weight = "+width+" Bitmap height "+height); Bitmap bitmap1 = Bitmap.createBitmap(bitmap, width/3, height/4, bitmap.getWidth() /3, bitmap.getHeight() /2); imageView.setImageBitmap(bitmap1);
但是以上方法只是’裁剪’,如果只是想要固定大小的而不裁剪呢?
/** * Creates a new bitmap, scaled from an existing bitmap, when possible. If the * specified width and height are the same as the current width and height of * the source bitmap, the source bitmap is returned and no new bitmap is * created. * * @param src The source bitmap. * @param dstWidth The new bitmap's desired width. * @param dstHeight The new bitmap's desired height. * @param filter Whether or not bilinear filtering should be used when scaling the * bitmap. If this is true then bilinear filtering will be used when * scaling which has better image quality at the cost of worse performance. * If this is false then nearest-neighbor scaling is used instead which * will have worse image quality but is faster. Recommended default * is to set filter to 'true' as the cost of bilinear filtering is * typically minimal and the improved image quality is significant. * @return The new scaled bitmap or the source bitmap if no scaling is required. * @throws IllegalArgumentException if width is <= 0, or height is <= 0 */ public static Bitmap createScaledBitmap(@NonNull Bitmap src, int dstWidth, int dstHeight, boolean filter) { Matrix m = new Matrix(); final int width = src.getWidth(); final int height = src.getHeight(); if (width != dstWidth || height != dstHeight) { final float sx = dstWidth / (float) width; final float sy = dstHeight / (float) height; m.setScale(sx, sy); } return Bitmap.createBitmap(src, 0, 0, width, height, m, filter); }
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