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

     */

publicvoidsetImg(String imgPath, ImageView imgView) {

        File file =newFile(imgPath);

        if(file.exists() && file.canRead()) {

            // -------1.图片缩放--------

            // 手机屏幕信息

            DisplayMetrics metric =newDisplayMetrics();

            getWindowManager().getDefaultDisplay().getMetrics(metric);

            intdw = metric.widthPixels;// 屏幕宽

            intdh = metric.heightPixels;// 屏幕高

            // 加载图像，只是为了获取尺寸

            BitmapFactory.Options options =newBitmapFactory.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

            intheightRatio = (int) Math.ceil(options.outHeight / (float) dh);

            intwidthRatio = (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 =newExifInterface(imgPath);

                intdegree =0;// 图片旋转角度

                if(exif !=null) {

                    intorientation = exif.getAttributeInt(

                            ExifInterface.TAG_ORIENTATION, -1);

                    if(orientation != -1) {

                        switch(orientation) {

                        caseExifInterface.ORIENTATION_ROTATE_90:

                            degree =90;

                            break;

                        caseExifInterface.ORIENTATION_ROTATE_180:

                            degree =180;

                            break;

                        caseExifInterface.ORIENTATION_ROTATE_270:

                            degree =270;

                            break;

                        default:

                            break;

                        }

                    }

                }

                if(degree !=0) {// 图片需要旋转

                    intwidth = bitmap.getWidth();

                    intheight = bitmap.getHeight();

                    Matrix matrix =newMatrix();

                    matrix.preRotate(degree);

                    Bitmap mRotateBitmap = Bitmap.createBitmap(bitmap,0,0,

                            width, height, matrix,true);

                    imgView.setImageBitmap(mRotateBitmap);

                }else{

                    imgView.setImageBitmap(bitmap);

                }

            }catch(IOException e) {

            }

        }

    }