android判断相机图片朝向的简单方法

public void setImg(String imgPath, ImageView imgView) {File file = new File(imgPath);if (file.exists() && file.canRead()) {// -------1.图片缩放--------// 手机屏幕信息DisplayMetrics metric = new DisplayMetrics();getWindowManager().getDefaultDisplay().getMetrics(metric);int dw = metric.widthPixels; // 屏幕宽int dh = metric.heightPixels; // 屏幕高// 加载图像，只是为了获取尺寸BitmapFactory.Options options = new BitmapFactory.Options();options.inJustDecodeBounds = true; // 设置之后可以获取尺寸信息Bitmap bitmap = BitmapFactory.decodeFile(imgPath, options);// 计算水平和垂直缩放系数int heightRatio = (int) Math.ceil(options.outHeight / (float) dh);int widthRatio = (int) Math.ceil(options.outWidth / (float) dw);// 判断哪个大if (heightRatio > 1 && widthRatio > 1) {if (heightRatio > widthRatio) {options.inSampleSize = heightRatio;} else {options.inSampleSize = widthRatio;}}// 图片缩放options.inJustDecodeBounds = false;bitmap = BitmapFactory.decodeFile(imgPath, options);// -------2.判断图片朝向--------try {ExifInterface exif = new ExifInterface(imgPath);int degree = 0; // 图片旋转角度if (exif != null) {int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, -1);if (orientation != -1) {switch (orientation) {case ExifInterface.ORIENTATION_ROTATE_90:degree = 90;break;case ExifInterface.ORIENTATION_ROTATE_180:degree = 180;break;case ExifInterface.ORIENTATION_ROTATE_270:degree = 270;break;default:break;}}}if (degree != 0) { // 图片需要旋转int width = bitmap.getWidth();int height = bitmap.getHeight();Matrix matrix = new Matrix();matrix.preRotate(degree);Bitmap mRotateBitmap = Bitmap.createBitmap(bitmap, 0, 0,width, height, matrix, true);imgView.setImageBitmap(mRotateBitmap);} else {imgView.setImageBitmap(bitmap);}} catch (IOException e) {}}}