原文地址：http://www.cnblogs.com/lee0oo0/archive/2013/12/06/3461392.html

Android之多种Bitmap效果

1. 将图片变为圆角

2. 获取缩略图图片

3. LOMO特效

4. 旧时光特效

5. 暖意特效

6. 根据饱和度、色相、亮度调整图片

7. 添加图片外边框

8. 添加内边框

9. 创建一个缩放的图片

/*** 图片工具类* * @author rendongwei* */
public class PhotoUtil {/*** 将图片变为圆角* * @param bitmap*            原Bitmap图片* @param pixels*            图片圆角的弧度(单位:像素(px))* @return 带有圆角的图片(Bitmap 类型)*/public static Bitmap toRoundCorner(Bitmap bitmap, int pixels) {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);final float roundPx = pixels;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;}public static boolean saveToSDCard(Bitmap bitmap) {if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {return false;}FileOutputStream fileOutputStream = null;File file = new File("/sdcard/KaiXin/Download/");if (!file.exists()) {file.mkdirs();}String fileName = UUID.randomUUID().toString() + ".jpg";String filePath = "/sdcard/KaiXin/Download/" + fileName;File f = new File(filePath);if (!f.exists()) {try {f.createNewFile();fileOutputStream = new FileOutputStream(filePath);bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fileOutputStream);} catch (IOException e) {return false;} finally {try {fileOutputStream.flush();fileOutputStream.close();} catch (IOException e) {return false;}}}return true;}/*** 保存图片到本地(JPG)* * @param bm*            保存的图片* @return 图片路径*/public static String saveToLocal(Bitmap bm) {if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {return null;}FileOutputStream fileOutputStream = null;File file = new File("/sdcard/KaiXin/Images/");if (!file.exists()) {file.mkdirs();}String fileName = UUID.randomUUID().toString() + ".jpg";String filePath = "/sdcard/KaiXin/Images/" + fileName;File f = new File(filePath);if (!f.exists()) {try {f.createNewFile();fileOutputStream = new FileOutputStream(filePath);bm.compress(Bitmap.CompressFormat.JPEG, 100, fileOutputStream);} catch (IOException e) {return null;} finally {try {fileOutputStream.flush();fileOutputStream.close();} catch (IOException e) {return null;}}}return filePath;}/*** 保存图片到本地(PNG)* * @param bm*            保存的图片* @return 图片路径*/public static String saveToLocalPNG(Bitmap bm) {if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {return null;}FileOutputStream fileOutputStream = null;File file = new File("/sdcard/KaiXin/Images/");if (!file.exists()) {file.mkdirs();}String fileName = UUID.randomUUID().toString() + ".png";String filePath = "/sdcard/KaiXin/Images/" + fileName;File f = new File(filePath);if (!f.exists()) {try {f.createNewFile();fileOutputStream = new FileOutputStream(filePath);bm.compress(Bitmap.CompressFormat.PNG, 100, fileOutputStream);} catch (IOException e) {return null;} finally {try {fileOutputStream.flush();fileOutputStream.close();} catch (IOException e) {return null;}}}return filePath;}/*** 获取缩略图图片* * @param imagePath*            图片的路径* @param width*            图片的宽度* @param height*            图片的高度* @return 缩略图图片*/public static Bitmap getImageThumbnail(String imagePath, int width, int height) {Bitmap bitmap = null;BitmapFactory.Options options = new BitmapFactory.Options();options.inJustDecodeBounds = true;// 获取这个图片的宽和高，注意此处的bitmap为nullbitmap = BitmapFactory.decodeFile(imagePath, options);options.inJustDecodeBounds = false; // 设为 false// 计算缩放比int h = options.outHeight;int w = options.outWidth;int beWidth = w / width;int beHeight = h / height;int be = 1;if (beWidth < beHeight) {be = beWidth;} else {be = beHeight;}if (be <= 0) {be = 1;}options.inSampleSize = be;// 重新读入图片，读取缩放后的bitmap，注意这次要把options.inJustDecodeBounds 设为 falsebitmap = BitmapFactory.decodeFile(imagePath, options);// 利用ThumbnailUtils来创建缩略图，这里要指定要缩放哪个Bitmap对象bitmap = ThumbnailUtils.extractThumbnail(bitmap, width, height, ThumbnailUtils.OPTIONS_RECYCLE_INPUT);return bitmap;}/*** LOMO特效* * @param bitmap*            原图片* @return LOMO特效图片*/public static Bitmap lomoFilter(Bitmap bitmap) {int width = bitmap.getWidth();int height = bitmap.getHeight();int dst[] = new int[width * height];bitmap.getPixels(dst, 0, width, 0, 0, width, height);int ratio = width > height ? height * 32768 / width : width * 32768 / height;int cx = width >> 1;int cy = height >> 1;int max = cx * cx + cy * cy;int min = (int) (max * (1 - 0.8f));int diff = max - min;int ri, gi, bi;int dx, dy, distSq, v;int R, G, B;int value;int pos, pixColor;int newR, newG, newB;for (int y = 0; y < height; y++) {for (int x = 0; x < width; x++) {pos = y * width + x;pixColor = dst[pos];R = Color.red(pixColor);G = Color.green(pixColor);B = Color.blue(pixColor);value = R < 128 ? R : 256 - R;newR = (value * value * value) / 64 / 256;newR = (R < 128 ? newR : 255 - newR);value = G < 128 ? G : 256 - G;newG = (value * value) / 128;newG = (G < 128 ? newG : 255 - newG);newB = B / 2 + 0x25;// ==========边缘黑暗==============//dx = cx - x;dy = cy - y;if (width > height)dx = (dx * ratio) >> 15;elsedy = (dy * ratio) >> 15;distSq = dx * dx + dy * dy;if (distSq > min) {v = ((max - distSq) << 8) / diff;v *= v;ri = newR * v >> 16;gi = newG * v >> 16;bi = newB * v >> 16;newR = ri > 255 ? 255 : (ri < 0 ? 0 : ri);newG = gi > 255 ? 255 : (gi < 0 ? 0 : gi);newB = bi > 255 ? 255 : (bi < 0 ? 0 : bi);}// ==========边缘黑暗end==============//dst[pos] = Color.rgb(newR, newG, newB);}}Bitmap acrossFlushBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);acrossFlushBitmap.setPixels(dst, 0, width, 0, 0, width, height);return acrossFlushBitmap;}/*** 旧时光特效* * @param bmp*            原图片* @return 旧时光特效图片*/public static Bitmap oldTimeFilter(Bitmap bmp) {int width = bmp.getWidth();int height = bmp.getHeight();Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);int pixColor = 0;int pixR = 0;int pixG = 0;int pixB = 0;int newR = 0;int newG = 0;int newB = 0;int[] pixels = new int[width * height];bmp.getPixels(pixels, 0, width, 0, 0, width, height);for (int i = 0; i < height; i++) {for (int k = 0; k < width; k++) {pixColor = pixels[width * i + k];pixR = Color.red(pixColor);pixG = Color.green(pixColor);pixB = Color.blue(pixColor);newR = (int) (0.393 * pixR + 0.769 * pixG + 0.189 * pixB);newG = (int) (0.349 * pixR + 0.686 * pixG + 0.168 * pixB);newB = (int) (0.272 * pixR + 0.534 * pixG + 0.131 * pixB);int newColor = Color.argb(255, newR > 255 ? 255 : newR, newG > 255 ? 255 : newG, newB > 255 ? 255: newB);pixels[width * i + k] = newColor;}}bitmap.setPixels(pixels, 0, width, 0, 0, width, height);return bitmap;}/*** 暖意特效* * @param bmp*            原图片* @param centerX*            光源横坐标* @param centerY*            光源纵坐标* @return 暖意特效图片*/public static Bitmap warmthFilter(Bitmap bmp, int centerX, int centerY) {final int width = bmp.getWidth();final int height = bmp.getHeight();Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);int pixR = 0;int pixG = 0;int pixB = 0;int pixColor = 0;int newR = 0;int newG = 0;int newB = 0;int radius = Math.min(centerX, centerY);final float strength = 150F; // 光照强度 100~150int[] pixels = new int[width * height];bmp.getPixels(pixels, 0, width, 0, 0, width, height);int pos = 0;for (int i = 1, length = height - 1; i < length; i++) {for (int k = 1, len = width - 1; k < len; k++) {pos = i * width + k;pixColor = pixels[pos];pixR = Color.red(pixColor);pixG = Color.green(pixColor);pixB = Color.blue(pixColor);newR = pixR;newG = pixG;newB = pixB;// 计算当前点到光照中心的距离，平面座标系中求两点之间的距离int distance = (int) (Math.pow((centerY - i), 2) + Math.pow(centerX - k, 2));if (distance < radius * radius) {// 按照距离大小计算增加的光照值int result = (int) (strength * (1.0 - Math.sqrt(distance) / radius));newR = pixR + result;newG = pixG + result;newB = pixB + result;}newR = Math.min(255, Math.max(0, newR));newG = Math.min(255, Math.max(0, newG));newB = Math.min(255, Math.max(0, newB));pixels[pos] = Color.argb(255, newR, newG, newB);}}bitmap.setPixels(pixels, 0, width, 0, 0, width, height);return bitmap;}/*** 根据饱和度、色相、亮度调整图片* * @param bm*            原图片* @param saturation*            饱和度* @param hue*            色相* @param lum*            亮度* @return 处理后的图片*/public static Bitmap handleImage(Bitmap bm, int saturation, int hue, int lum) {Bitmap bmp = Bitmap.createBitmap(bm.getWidth(), bm.getHeight(), Bitmap.Config.ARGB_8888);Canvas canvas = new Canvas(bmp);Paint paint = new Paint();paint.setAntiAlias(true);ColorMatrix mLightnessMatrix = new ColorMatrix();ColorMatrix mSaturationMatrix = new ColorMatrix();ColorMatrix mHueMatrix = new ColorMatrix();ColorMatrix mAllMatrix = new ColorMatrix();float mSaturationValue = saturation * 1.0F / 127;float mHueValue = hue * 1.0F / 127;float mLumValue = (lum - 127) * 1.0F / 127 * 180;mHueMatrix.reset();mHueMatrix.setScale(mHueValue, mHueValue, mHueValue, 1);mSaturationMatrix.reset();mSaturationMatrix.setSaturation(mSaturationValue);mLightnessMatrix.reset();mLightnessMatrix.setRotate(0, mLumValue);mLightnessMatrix.setRotate(1, mLumValue);mLightnessMatrix.setRotate(2, mLumValue);mAllMatrix.reset();mAllMatrix.postConcat(mHueMatrix);mAllMatrix.postConcat(mSaturationMatrix);mAllMatrix.postConcat(mLightnessMatrix);paint.setColorFilter(new ColorMatrixColorFilter(mAllMatrix));canvas.drawBitmap(bm, 0, 0, paint);return bmp;}/*** 添加图片外边框* * @param context*            上下文* @param bm*            原图片* @param frameName*            边框名称* @return 带有边框的图片*/public static Bitmap combinateFrame(Context context, Bitmap bm, String frameName) {// 原图片的宽高int imageWidth = bm.getWidth();int imageHeight = bm.getHeight();// 边框Bitmap leftUp = decodeBitmap(context, frameName, 0);Bitmap leftDown = decodeBitmap(context, frameName, 2);Bitmap rightDown = decodeBitmap(context, frameName, 4);Bitmap rightUp = decodeBitmap(context, frameName, 6);Bitmap top = decodeBitmap(context, frameName, 7);Bitmap down = decodeBitmap(context, frameName, 3);Bitmap left = decodeBitmap(context, frameName, 1);Bitmap right = decodeBitmap(context, frameName, 5);Bitmap newBitmap = null;Canvas canvas = null;// 判断大小图片的宽高int judgeWidth = 0;int judgeHeight = 0;if ("frame7".equals(frameName)) {judgeWidth = leftUp.getWidth() + rightUp.getWidth() + top.getWidth() * 5;judgeHeight = leftUp.getHeight() + leftDown.getHeight() + left.getHeight() * 5;} else if ("frame10".equals(frameName)) {judgeWidth = leftUp.getWidth() + rightUp.getWidth() + top.getWidth() * 5;judgeHeight = leftUp.getHeight() + leftDown.getHeight() + left.getHeight() * 10;} else {judgeWidth = leftUp.getWidth() + rightUp.getWidth() + top.getWidth();judgeHeight = leftUp.getHeight() + leftDown.getHeight() + left.getHeight();}// 内边框if (imageWidth > judgeWidth && imageHeight > judgeHeight) {// 重新定义一个bitmapnewBitmap = Bitmap.createBitmap(imageWidth, imageHeight, Config.ARGB_8888);canvas = new Canvas(newBitmap);Paint paint = new Paint();// 画原图canvas.drawBitmap(bm, 0, 0, paint);// 上空余宽度int topWidth = imageWidth - leftUp.getWidth() - rightUp.getWidth();// 上空余填充个数int topCount = (int) Math.ceil(topWidth * 1.0f / top.getWidth());for (int i = 0; i < topCount; i++) {canvas.drawBitmap(top, leftUp.getWidth() + top.getWidth() * i, 0, paint);}// 下空余宽度int downWidth = imageWidth - leftDown.getWidth() - rightDown.getWidth();// 下空余填充个数int downCount = (int) Math.ceil(downWidth * 1.0f / down.getWidth());for (int i = 0; i < downCount; i++) {canvas.drawBitmap(down, leftDown.getWidth() + down.getWidth() * i, imageHeight - down.getHeight(),paint);}// 左空余高度int leftHeight = imageHeight - leftUp.getHeight() - leftDown.getHeight();// 左空余填充个数int leftCount = (int) Math.ceil(leftHeight * 1.0f / left.getHeight());for (int i = 0; i < leftCount; i++) {canvas.drawBitmap(left, 0, leftUp.getHeight() + left.getHeight() * i, paint);}// 右空余高度int rightHeight = imageHeight - rightUp.getHeight() - rightDown.getHeight();// 右空余填充个数int rightCount = (int) Math.ceil(rightHeight * 1.0f / right.getHeight());for (int i = 0; i < rightCount; i++) {canvas.drawBitmap(right, imageWidth - right.getWidth(), rightUp.getHeight() + right.getHeight() * i,paint);}// 画左上角canvas.drawBitmap(leftUp, 0, 0, paint);// 画左下角canvas.drawBitmap(leftDown, 0, imageHeight - leftDown.getHeight(), paint);// 画右下角canvas.drawBitmap(rightDown, imageWidth - rightDown.getWidth(), imageHeight - rightDown.getHeight(), paint);// 画右上角canvas.drawBitmap(rightUp, imageWidth - rightUp.getWidth(), 0, paint);} else {if ("frame7".equals(frameName)) {imageWidth = leftUp.getWidth() + top.getWidth() * 5 + rightUp.getWidth();imageHeight = leftUp.getHeight() + left.getHeight() * 5 + leftDown.getHeight();} else if ("frame10".equals(frameName)) {imageWidth = leftUp.getWidth() + top.getWidth() * 5 + rightUp.getWidth();imageHeight = leftUp.getHeight() + left.getHeight() * 10 + leftDown.getHeight();} else {imageWidth = leftUp.getWidth() + top.getWidth() + rightUp.getWidth();imageHeight = leftUp.getHeight() + left.getHeight() + leftDown.getHeight();}newBitmap = Bitmap.createBitmap(imageWidth, imageHeight, Config.ARGB_8888);canvas = new Canvas(newBitmap);Paint paint = new Paint();int newImageWidth = imageWidth - left.getWidth() - right.getWidth() + 5;int newImageHeight = imageHeight - top.getHeight() - down.getHeight() + 5;bm = Bitmap.createScaledBitmap(bm, newImageWidth, newImageHeight, true);canvas.drawBitmap(bm, left.getWidth(), top.getHeight(), paint);if ("frame7".equals(frameName)) {for (int i = 0; i < 5; i++) {canvas.drawBitmap(top, leftUp.getWidth() + top.getWidth() * i, 0, paint);}for (int i = 0; i < 5; i++) {canvas.drawBitmap(left, 0, leftUp.getHeight() + left.getHeight() * i, paint);}for (int i = 0; i < 5; i++) {canvas.drawBitmap(right, imageWidth - right.getWidth(),rightUp.getHeight() + right.getHeight() * i, paint);}for (int i = 0; i < 5; i++) {canvas.drawBitmap(down, leftDown.getWidth() + down.getWidth() * i, imageHeight - down.getHeight(),paint);}canvas.drawBitmap(leftUp, 0, 0, paint);canvas.drawBitmap(rightUp, leftUp.getWidth() + top.getWidth() * 5, 0, paint);canvas.drawBitmap(leftDown, 0, leftUp.getHeight() + left.getHeight() * 5, paint);canvas.drawBitmap(rightDown, imageWidth - rightDown.getWidth(), rightUp.getHeight() + right.getHeight()* 5, paint);} else if ("frame10".equals(frameName)) {for (int i = 0; i < 5; i++) {canvas.drawBitmap(top, leftUp.getWidth() + top.getWidth() * i, 0, paint);}for (int i = 0; i < 10; i++) {canvas.drawBitmap(left, 0, leftUp.getHeight() + left.getHeight() * i, paint);}for (int i = 0; i < 10; i++) {canvas.drawBitmap(right, imageWidth - right.getWidth(),rightUp.getHeight() + right.getHeight() * i, paint);}for (int i = 0; i < 5; i++) {canvas.drawBitmap(down, leftDown.getWidth() + down.getWidth() * i, imageHeight - down.getHeight(),paint);}canvas.drawBitmap(leftUp, 0, 0, paint);canvas.drawBitmap(rightUp, leftUp.getWidth() + top.getWidth() * 5, 0, paint);canvas.drawBitmap(leftDown, 0, leftUp.getHeight() + left.getHeight() * 10, paint);canvas.drawBitmap(rightDown, imageWidth - rightDown.getWidth(), rightUp.getHeight() + right.getHeight()* 10, paint);} else {canvas.drawBitmap(leftUp, 0, 0, paint);canvas.drawBitmap(top, leftUp.getWidth(), 0, paint);canvas.drawBitmap(rightUp, leftUp.getWidth() + top.getWidth(), 0, paint);canvas.drawBitmap(left, 0, leftUp.getHeight(), paint);canvas.drawBitmap(leftDown, 0, leftUp.getHeight() + left.getHeight(), paint);canvas.drawBitmap(right, imageWidth - right.getWidth(), rightUp.getHeight(), paint);canvas.drawBitmap(rightDown, imageWidth - rightDown.getWidth(),rightUp.getHeight() + right.getHeight(), paint);canvas.drawBitmap(down, leftDown.getWidth(), imageHeight - down.getHeight(), paint);}}// 回收leftUp.recycle();leftUp = null;leftDown.recycle();leftDown = null;rightDown.recycle();rightDown = null;rightUp.recycle();rightUp = null;top.recycle();top = null;down.recycle();down = null;left.recycle();left = null;right.recycle();right = null;canvas.save(Canvas.ALL_SAVE_FLAG);canvas.restore();return newBitmap;}/*** 获取边框图片* * @param context*            上下文* @param frameName*            边框名称* @param position*            边框的类型* @return 边框图片*/private static Bitmap decodeBitmap(Context context, String frameName, int position) {try {switch (position) {case 0:return BitmapFactory.decodeStream(context.getAssets().open("frames/" + frameName + "/leftup.png"));case 1:return BitmapFactory.decodeStream(context.getAssets().open("frames/" + frameName + "/left.png"));case 2:return BitmapFactory.decodeStream(context.getAssets().open("frames/" + frameName + "/leftdown.png"));case 3:return BitmapFactory.decodeStream(context.getAssets().open("frames/" + frameName + "/down.png"));case 4:return BitmapFactory.decodeStream(context.getAssets().open("frames/" + frameName + "/rightdown.png"));case 5:return BitmapFactory.decodeStream(context.getAssets().open("frames/" + frameName + "/right.png"));case 6:return BitmapFactory.decodeStream(context.getAssets().open("frames/" + frameName + "/rightup.png"));case 7:return BitmapFactory.decodeStream(context.getAssets().open("frames/" + frameName + "/up.png"));default:return null;}} catch (IOException e) {e.printStackTrace();return null;}}/*** 添加内边框* * @param bm*            原图片* @param frame*            内边框图片* @return 带有边框的图片*/public static Bitmap addBigFrame(Bitmap bm, Bitmap frame) {Bitmap newBitmap = Bitmap.createBitmap(bm.getWidth(), bm.getHeight(), Config.ARGB_8888);Canvas canvas = new Canvas(newBitmap);Paint paint = new Paint();canvas.drawBitmap(bm, 0, 0, paint);frame = Bitmap.createScaledBitmap(frame, bm.getWidth(), bm.getHeight(), true);canvas.drawBitmap(frame, 0, 0, paint);canvas.save(Canvas.ALL_SAVE_FLAG);canvas.restore();return newBitmap;}/*** 创建一个缩放的图片* * @param path*            图片地址* @param w*            图片宽度* @param h*            图片高度* @return 缩放后的图片*/public static Bitmap createBitmap(String path, int w, int h) {try {BitmapFactory.Options opts = new BitmapFactory.Options();opts.inJustDecodeBounds = true;// 这里是整个方法的关键，inJustDecodeBounds设为true时将不为图片分配内存。BitmapFactory.decodeFile(path, opts);int srcWidth = opts.outWidth;// 获取图片的原始宽度int srcHeight = opts.outHeight;// 获取图片原始高度int destWidth = 0;int destHeight = 0;// 缩放的比例double ratio = 0.0;if (srcWidth < w || srcHeight < h) {ratio = 0.0;destWidth = srcWidth;destHeight = srcHeight;} else if (srcWidth > srcHeight) {// 按比例计算缩放后的图片大小，maxLength是长或宽允许的最大长度ratio = (double) srcWidth / w;destWidth = w;destHeight = (int) (srcHeight / ratio);} else {ratio = (double) srcHeight / h;destHeight = h;destWidth = (int) (srcWidth / ratio);}BitmapFactory.Options newOpts = new BitmapFactory.Options();// 缩放的比例，缩放是很难按准备的比例进行缩放的，目前我只发现只能通过inSampleSize来进行缩放，其值表明缩放的倍数，SDK中建议其值是2的指数值newOpts.inSampleSize = (int) ratio + 1;// inJustDecodeBounds设为false表示把图片读进内存中newOpts.inJustDecodeBounds = false;// 设置大小，这个一般是不准确的，是以inSampleSize的为准，但是如果不设置却不能缩放newOpts.outHeight = destHeight;newOpts.outWidth = destWidth;// 获取缩放后图片return BitmapFactory.decodeFile(path, newOpts);} catch (Exception e) {// TODO: handle exceptionreturn null;}}public static Bitmap createBitmap2(Context context, int id, int w, int h) {try {BitmapFactory.Options opts = new BitmapFactory.Options();opts.inJustDecodeBounds = true;// 这里是整个方法的关键，inJustDecodeBounds设为true时将不为图片分配内存。BitmapFactory.decodeResource(context.getResources(), id, opts);int srcWidth = opts.outWidth;// 获取图片的原始宽度int srcHeight = opts.outHeight;// 获取图片原始高度int destWidth = 0;int destHeight = 0;// 缩放的比例double ratio = 0.0;if (srcWidth < w || srcHeight < h) {ratio = 0.0;destWidth = srcWidth;destHeight = srcHeight;} else if (srcWidth > srcHeight) {// 按比例计算缩放后的图片大小，maxLength是长或宽允许的最大长度ratio = (double) srcWidth / w;destWidth = w;destHeight = (int) (srcHeight / ratio);} else {ratio = (double) srcHeight / h;destHeight = h;destWidth = (int) (srcWidth / ratio);}BitmapFactory.Options newOpts = new BitmapFactory.Options();// 缩放的比例，缩放是很难按准备的比例进行缩放的，目前我只发现只能通过inSampleSize来进行缩放，其值表明缩放的倍数，SDK中建议其值是2的指数值newOpts.inSampleSize = (int) ratio + 1;// inJustDecodeBounds设为false表示把图片读进内存中newOpts.inJustDecodeBounds = false;// 设置大小，这个一般是不准确的，是以inSampleSize的为准，但是如果不设置却不能缩放newOpts.outHeight = destHeight;newOpts.outWidth = destWidth;// 获取缩放后图片// return BitmapFactory.decodeFile(path, newOpts);return BitmapFactory.decodeResource(context.getResources(), id, newOpts);} catch (Exception e) {// TODO: handle exceptionreturn null;}}
}

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