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我正在使用 exifInterface 进行照片旋转问题代码如下：面对从相机捕获的图像方向问题。

  • 从文件创建位图
Bitmap b = BitmapFactory.decodeFile(imagePath);
  • 通过将位图缩放到适当的级别来调整其大小
int width = b.getWidth();
int height = b.getHeight();
int newWidth = 150;
int newHeight = 150;
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
Matrix matrix = new Matrix();
matrix.postScale(scaleWidth, scaleHeight);
// Bitmap resizedBitmap = Bitmap.createBitmap(b, 0, 0, width, height, matrix, true);
// resizedBitmap.compress(Bitmap.CompressFormat.JPEG, 70, out);
  • 处理图像的方向
 ExifInterface exif = new ExifInterface(imagePath);
    String orientation = exif.getAttribute(ExifInterface.TAG_ORIENTATION);
    if (orientation.equals(ExifInterface.ORIENTATION_NORMAL)) {
            // Do nothing. The original image is fine.
    } else if (orientation.equals(ExifInterface.ORIENTATION_ROTATE_90+"")) {
            matrix.postRotate(90);
    } else if (orientation.equals(ExifInterface.ORIENTATION_ROTATE_180+"")) {
            matrix.postRotate(180);
    } else if (orientation.equals(ExifInterface.ORIENTATION_ROTATE_270+"")) {
            matrix.postRotate(270);
}
  • 保存新位图 
 out = new FileOutputStream(new File("some output file path"));
    Bitmap resizedBitmap = Bitmap.createBitmap(b, 0, 0, width, height, matrix, true);
    resizedBitmap.compress(Bitmap.CompressFormat.JPEG, 70, out);

此代码无法解决旋转问题，请给我指导。在 Lg 设备上，exifinterface 总是返回 0 方向，三星设备返回 6 和 1。

如何使用 htc、摩托罗拉、三星、索尼和 LG 等所有设备解决此问题。

我很感谢大家，请帮助我。

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1 回答 1

7

您可以使用此功能来执行您需要的相同操作。在您的活动或任何实用程序类中具有此功能并调用它以从文件路径获取位图。

我一直在我的应用程序中使用此功能，我的主要测试设备是 LG。

public static Bitmap decodeFile(String path) {
    int orientation;
    try {
        if (path == null) {
            return null;
        }
        // decode image size
        BitmapFactory.Options o = new BitmapFactory.Options();
        o.inJustDecodeBounds = true;
        // Find the correct scale value. It should be the power of 2.
        final int REQUIRED_SIZE = 70;
        int width_tmp = o.outWidth, height_tmp = o.outHeight;
        int scale = 8;
        while (true) {
            if (width_tmp / 2 < REQUIRED_SIZE
                    || height_tmp / 2 < REQUIRED_SIZE)
                break;
            width_tmp /= 2;
            height_tmp /= 2;
            scale++;
        }
        // decode with inSampleSize
        BitmapFactory.Options o2 = new BitmapFactory.Options();
        o2.inSampleSize = scale;
        Bitmap bm = BitmapFactory.decodeFile(path, o2);
        Bitmap bitmap = bm;

        ExifInterface exif = new ExifInterface(path);
        orientation = exif
                .getAttributeInt(ExifInterface.TAG_ORIENTATION, 1);
        Log.e("orientation", "" + orientation);
        Matrix m = new Matrix();

        if ((orientation == 3)) {
            m.postRotate(180);
            m.postScale((float) bm.getWidth(), (float) bm.getHeight());
            // if(m.preRotate(90)){
            Log.e("in orientation", "" + orientation);
            bitmap = Bitmap.createBitmap(bm, 0, 0, bm.getWidth(),
                    bm.getHeight(), m, true);
            return bitmap;
        } else if (orientation == 6) {
            m.postRotate(90);
            Log.e("in orientation", "" + orientation);
            bitmap = Bitmap.createBitmap(bm, 0, 0, bm.getWidth(),
                    bm.getHeight(), m, true);
            return bitmap;
        }
        else if (orientation == 8) {
            m.postRotate(270);
            Log.e("in orientation", "" + orientation);
            bitmap = Bitmap.createBitmap(bm, 0, 0, bm.getWidth(),
                    bm.getHeight(), m, true);
            return bitmap;
        }
        return bitmap;
    } catch (Exception e) {
    }
    return null;
}
于 2012-09-06T12:35:51.177 回答