/** * 利用給定路徑下的圖片設置ImageView * @param imgPath 手機圖片文件路徑 * @param imgView 需要設置的ImageView */ public void setImg(String imgPath, ImageView imgView) { File file = new File(imgPath); if (file.exists() && file.canRead()) {  // -------1.圖片縮放--------  // 手機屏幕信息  DisplayMetrics metric = new DisplayMetrics();  getWindowManager().getDefaultDisplay().getMetrics(metric);  int dw = metric.widthPixels; // 屏幕寬  int dh = metric.heightPixels; // 屏幕高  // 加載圖像，只是為了獲取尺寸  BitmapFactory.Options options = new BitmapFactory.Options();  options.inJustDecodeBounds = true; // 設置之后可以獲取尺寸信息  Bitmap bitmap = BitmapFactory.decodeFile(imgPath, options);  // 計算水平和垂直縮放系數  int heightRatio = (int) Math.ceil(options.outHeight / (float) dh);  int widthRatio = (int) Math.ceil(options.outWidth / (float) dw);  // 判斷哪個大  if (heightRatio > 1 && widthRatio > 1) {  if (heightRatio > widthRatio) {   options.inSampleSize = heightRatio;  } else {   options.inSampleSize = widthRatio;  }  }  // 圖片縮放  options.inJustDecodeBounds = false;  bitmap = BitmapFactory.decodeFile(imgPath, options);  // -------2.判斷圖片朝向--------  try {  ExifInterface exif = new ExifInterface(imgPath);  int degree = 0; // 圖片旋轉角度  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) { // 圖片需要旋轉   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) {  } } }