android判断相机图片朝向的简单方法

/**	 * 	 * 利用给定路径下的图片设置ImageView	 * 	 * @param imgPath	手机图片文件路径	 * @param imgView	需要设置的ImageView	 */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) {			}		}	}