使用相机拍摄时将图像旋转到移动设备的方向：Android

Question

我正在构建一个Android应用程序，从手机的相机中单击照片并将其显示在ImageView中，它会自动逆时针旋转90度。我想以手机单击的方向而不是手机的方向显示它让它旋转。

谁能提供相关的代码片段或一些相关文档的指针？

Answer 1

检查ExifInterface

ExifInterface exif = new ExifInterface(imageFilePath);
int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);

switch(orientation) {
case ExifInterface.ORIENTATION_ROTATE_90:
    // rotate the image
    break;

    //....
}

Answer 2

使用这种方法将帮助您。

/*   
 * 1 = Horizontal (normal) 
 * 2 = Mirror horizontal 
 * 3 = Rotate 180 
 * 4 = Mirror vertical 
 * 5 = Mirror horizontal and rotate 270 CW 
 * 6 = Rotate 90 CW 
 * 7 = Mirror horizontal and rotate 90 CW 
 * 8 = Rotate 270 CW
 */
public static Bitmap getRotateBitmapImage(Bitmap bm, int newHeight,int newWidth, int exifOrientation) {
    int width = bm.getWidth();
    int height = bm.getHeight();
    float scaleWidth = ((float) newWidth) / width;
    float scaleHeight = ((float) newHeight) / height;
    Matrix matrix = new Matrix();
    matrix.postScale(scaleWidth, scaleHeight);
    switch (exifOrientation) {
    case ExifInterface.ORIENTATION_ROTATE_270:
        rotate = 270;
        break;
    case ExifInterface.ORIENTATION_ROTATE_180:
        rotate = 180;
        break;
    case ExifInterface.ORIENTATION_ROTATE_90:
        rotate = 90;
        break;
    case ExifInterface.ORIENTATION_TRANSPOSE:
        rotate = 45;
        break;
    case 0:
        rotate = 360;
        break;
    default:
        break;
    }
    matrix.postRotate(rotate);
    // resizedBitmap = Bitmap.createScaledBitmap(bm, 65, 65, true);
    Bitmap resizedBitmap = Bitmap.createBitmap(bm, 0, 0, width, height, matrix, false);
    return resizedBitmap;
}