android图像处理系列之二－－图片旋转、缩放、反转

转自：http://blog.csdn.net/maylian7700/article/details/7071837

注意是反转，不是翻转。贴图：

原图：

处理后：

下面看代码：

package com.jacp.image.util;import android.graphics.Bitmap;import android.graphics.Matrix;/** * 图片处理 *  * @author [email protected] *  */public class ImageHandler {/** * 图片旋转 *  * @param bmp *            要旋转的图片 * @param degree *            图片旋转的角度，负值为逆时针旋转，正值为顺时针旋转 * @return */public static Bitmap rotateBitmap(Bitmap bmp, float degree) {Matrix matrix = new Matrix();matrix.postRotate(degree);return Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(), bmp.getHeight(), matrix, true);}/** * 图片缩放 *  * @param bm * @param scale *            值小于则为缩小，否则为放大 * @return */public static Bitmap resizeBitmap(Bitmap bm, float scale) {Matrix matrix = new Matrix();matrix.postScale(scale, scale);return Bitmap.createBitmap(bm, 0, 0, bm.getWidth(), bm.getHeight(), matrix, true);}/** * 图片缩放 *  * @param bm * @param w *            缩小或放大成的宽 * @param h *            缩小或放大成的高 * @return */public static Bitmap resizeBitmap(Bitmap bm, int w, int h) {Bitmap BitmapOrg = bm;int width = BitmapOrg.getWidth();int height = BitmapOrg.getHeight();float scaleWidth = ((float) w) / width;float scaleHeight = ((float) h) / height;Matrix matrix = new Matrix();matrix.postScale(scaleWidth, scaleHeight);return Bitmap.createBitmap(BitmapOrg, 0, 0, width, height, matrix, true);}/** * 图片反转 *  * @param bm * @param flag *            0为水平反转，1为垂直反转 * @return */public static Bitmap reverseBitmap(Bitmap bmp, int flag) {float[] floats = null;switch (flag) {case 0: // 水平反转floats = new float[] { -1f, 0f, 0f, 0f, 1f, 0f, 0f, 0f, 1f };break;case 1: // 垂直反转floats = new float[] { 1f, 0f, 0f, 0f, -1f, 0f, 0f, 0f, 1f };break;}if (floats != null) {Matrix matrix = new Matrix();matrix.setValues(floats);return Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(), bmp.getHeight(), matrix, true);}return null;}}

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