/**
 * 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(shù)
  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(zhuǎn)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(zhuǎn)
   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) {
  }
 }
 }