Android bitmap 转RGB数组（三通道）、RGB数组（单、三通道）转回Bitmap、bitmap Resize 512

数组（三通道）、RGB数组（单、三通道）转回Bitmap、bitmap Resize 512"/>

Android bitmap 转RGB数组（三通道）、RGB数组（单、三通道）转回Bitmap、bitmap Resize 512

直接上工具类，简单易懂

import android.graphics.Bitmap;
import android.graphics.Matrix;/*** bitmap and rgb bytes dual transfer** @author guochao* @version 1.0* @since 2019/12/12*/
public class BitmapAndRgbByteUtil {private static final String TAG = BitmapAndRgbByteUtil.class.getSimpleName();public static final int RGB_DATA_WIDTH_OR_HEIGHT = 512;private static int mOriginWidth;private static int mOriginHeight;/*** 单通道数组转bitmap*/public static Bitmap rgb2BitmapFor123(byte[] data, int width, int height) {long startTime = System.currentTimeMillis();try {int[] colors = convertByteToColor123(data);//取RGB值转换为int数组if (colors == null) {return null;}return Bitmap.createBitmap(colors, 0, width, width, height,Bitmap.Config.ARGB_8888);} catch (Exception e) {} finally {}return null;}/*** 三通道数组转3通道bitmap*/public static Bitmap rgb2BitmapFor323(byte[] data, int width, int height) {long startTime = System.currentTimeMillis();try {int[] colors = convertByteToColor323(data);//取RGB值转换为int数组if (colors == null) {return null;}return Bitmap.createBitmap(colors, 0, width, width, height,Bitmap.Config.ARGB_8888);} catch (Exception e) {} finally {}return null;}/*** 将一个byte数转成int* 实现这个函数的目的是为了将byte数当成无符号的变量去转化成int** @param data byte字节*/private static int convertByteToInt(byte data) {int heightBit = (int) ((data >> 4) & 0x0F);int lowBit = (int) (0x0F & data);return heightBit * 16 + lowBit;}/*** 将纯RGB数据数组转化成int像素数组** @param data rgb数组 输入为单通道,输出为3通道*/private static int[] convertByteToColor123(byte[] data) {int size = -1;if (data != null) {size = data.length;}if (size == 0) {return null;}int arg = 0;if (size % 3 != 0) {arg = 1;}// 一般RGB字节数组的长度应该是3的倍数，// 不排除有特殊情况，多余的RGB数据用黑色0XFF000000填充int[] color = new int[size + arg];int red, green, blue;int colorLen = color.length;if (arg == 0) {for (int i = 0; i < colorLen; ++i) {red = convertByteToInt(data[i]);green = convertByteToInt(data[i]);blue = convertByteToInt(data[i]);// 获取RGB分量值通过按位或生成int的像素值color[i] = (red << 16) | (green << 8) | blue | 0xFF000000;}} else {for (int i = 0; i < colorLen - 1; ++i) {red = convertByteToInt(data[i]);green = convertByteToInt(data[i]);blue = convertByteToInt(data[i]);color[i] = (red << 16) | (green << 8) | blue | 0xFF000000;}color[colorLen - 1] = 0xFF000000;}return color;}/*** 将纯RGB数据数组转化成int像素数组，转三通道** @param data rgb数组 输入为三通道*/private static int[] convertByteToColor323(byte[] data) {int size = -1;if (data != null) {size = data.length;}if (size == 0) {return null;}int arg = 0;if (size % 3 != 0) {arg = 1;}// 一般RGB字节数组的长度应该是3的倍数，// 不排除有特殊情况，多余的RGB数据用黑色0XFF000000填充int[] color = new int[size / 3 + arg];int red, green, blue;int colorLen = color.length;if (arg == 0) {for (int i = 0; i < colorLen; ++i) {red = convertByteToInt(data[i * 3]);green = convertByteToInt(data[i * 3 + 1]);blue = convertByteToInt(data[i * 3 + 2]);// 获取RGB分量值通过按位或生成int的像素值color[i] = (red << 16) | (green << 8) | blue | 0xFF000000;}} else {for (int i = 0; i < colorLen - 1; ++i) {red = convertByteToInt(data[i * 3]);green = convertByteToInt(data[i * 3 + 1]);blue = convertByteToInt(data[i * 3 + 2]);color[i] = (red << 16) | (green << 8) | blue | 0xFF000000;}color[colorLen - 1] = 0xFF000000;}return color;}/*** 将bitmap 转换为RGB数组（三通道）* @param bitmap* @return*/public static byte[] bitmap2RGBData(Bitmap bitmap) {int width = bitmap.getWidth();int height = bitmap.getHeight();int[] intValues = new int[width * height];bitmap.getPixels(intValues, 0, width, 0, 0, width,height);byte[] rgb = new byte[width * height * 3];for (int i = 0; i < intValues.length; ++i) {final int val = intValues[i];rgb[i * 3] = (byte) ((val >> 16) & 0xFF);//Rrgb[i * 3 + 1] = (byte) ((val >> 8) & 0xFF);//Grgb[i * 3 + 2] = (byte) (val & 0xFF);//B}return rgb;}public static Bitmap resizeTo512(Bitmap bm) {mOriginWidth = bm.getWidth();mOriginHeight = bm.getHeight();AieLogger.d(TAG,"resizeTo512 origin width: " + mOriginWidth + ", height:" + mOriginHeight);// 设置想要的大小int newWidth = RGB_DATA_WIDTH_OR_HEIGHT;int newHeight = RGB_DATA_WIDTH_OR_HEIGHT;// 计算缩放比例float scaleWidth = ((float) newWidth) / mOriginWidth;float scaleHeight = ((float) newHeight) / mOriginHeight;// 取得想要缩放的matrix参数Matrix matrix = new Matrix();matrix.postScale(scaleWidth, scaleHeight);// 得到新的图片return Bitmap.createBitmap(bm, 0, 0, mOriginWidth, mOriginHeight, matrix, true);}public static Bitmap resize512ToOrigin(Bitmap bm) {// 获取之前图片的原始比例int newWidth = mOriginWidth;int newHeight = mOriginHeight;// 计算缩放比例float scaleWidth = ((float) newWidth) / RGB_DATA_WIDTH_OR_HEIGHT;float scaleHeight = ((float) newHeight) / RGB_DATA_WIDTH_OR_HEIGHT;// 取得想要缩放的matrix参数Matrix matrix = new Matrix();matrix.postScale(scaleWidth, scaleHeight);// 得到新的图片return Bitmap.createBitmap(bm, 0, 0, RGB_DATA_WIDTH_OR_HEIGHT,RGB_DATA_WIDTH_OR_HEIGHT, matrix, true);}
}