图片来源图库自动旋转 - 机器人 [英] Image from gallery rotates automatically - Android

问题描述

在我的Andr​​oid应用我加载从，我就面临形象定位问题设备gallery.In图像。当我加载大分辨率的图像从画廊，它们会自动旋转，然后在我的视图中显示。我想关于这个问题的各种解决方案，但无法得到妥善的解决办法。我称之为<一个href="http://stackoverflow.com/questions/12369138/disable-android-image-auto-rotate">getOrientation()和<一href="http://stackoverflow.com/questions/3647993/android-bitmaps-loaded-from-gallery-are-rotated-in-imageview">this链接。我曾尝试这两种解决方案，但无法得到所需的result.The ExifInterface 返回正确的数据，但随后也他们没有帮助，因为他们的大分辨率为图像旋转没有因为相机方向。请帮我解决这个问题的解决方案。

In my android application i am loading image from device gallery.In that, i am facing issue regarding image orientation. When i load large resolution images from gallery, they are automatically rotated then display in my view. I tried various solution regarding this problem but couldn't get proper solution. I referred getOrientation() , and this links. I have tried both solutions but couldn't got desired result.The ExifInterface return proper data but then also they are not helpful as images are rotated because of their large resolution not because of camera orientation. Please help me to solve this solution.

感谢你。

推荐答案

请一个类名为 ExifUtils 的

Make one class named ExifUtils

public class ExifUtils {
/**
 * @see http://sylvana.net/jpegcrop/exif_orientation.html
 */
public static Bitmap rotateBitmap(String src, Bitmap bitmap) {
    try {
        int orientation = getExifOrientation(src);

        if (orientation == 1) {
            return bitmap;
        }

        Matrix matrix = new Matrix();
        switch (orientation) {
        case 2:
            matrix.setScale(-1, 1);
            break;
        case 3:
            matrix.setRotate(180);
            break;
        case 4:
            matrix.setRotate(180);
            matrix.postScale(-1, 1);
            break;
        case 5:
            matrix.setRotate(90);
            matrix.postScale(-1, 1);
            break;
        case 6:
            matrix.setRotate(90);
            break;
        case 7:
            matrix.setRotate(-90);
            matrix.postScale(-1, 1);
            break;
        case 8:
            matrix.setRotate(-90);
            break;
        default:
            return bitmap;
        }

        try {
            Bitmap oriented = Bitmap.createBitmap(bitmap, 0, 0,
                    bitmap.getWidth(), bitmap.getHeight(), matrix, true);
            bitmap.recycle();
            return oriented;
        } catch (OutOfMemoryError e) {
            e.printStackTrace();
            return bitmap;
        }
    } catch (IOException e) {
        e.printStackTrace();
    }

    return bitmap;
}

private static int getExifOrientation(String src) throws IOException {
    int orientation = 1;

    try {
        /**
         * if your are targeting only api level >= 5 ExifInterface exif =
         * new ExifInterface(src); orientation =
         * exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, 1);
         */
        if (Build.VERSION.SDK_INT >= 5) {
            Class<?> exifClass = Class
                    .forName("android.media.ExifInterface");
            Constructor<?> exifConstructor = exifClass
                    .getConstructor(new Class[] { String.class });
            Object exifInstance = exifConstructor
                    .newInstance(new Object[] { src });
            Method getAttributeInt = exifClass.getMethod("getAttributeInt",
                    new Class[] { String.class, int.class });
            Field tagOrientationField = exifClass
                    .getField("TAG_ORIENTATION");
            String tagOrientation = (String) tagOrientationField.get(null);
            orientation = (Integer) getAttributeInt.invoke(exifInstance,
                    new Object[] { tagOrientation, 1 });
        }
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    } catch (SecurityException e) {
        e.printStackTrace();
    } catch (NoSuchMethodException e) {
        e.printStackTrace();
    } catch (IllegalArgumentException e) {
        e.printStackTrace();
    } catch (InstantiationException e) {
        e.printStackTrace();
    } catch (IllegalAccessException e) {
        e.printStackTrace();
    } catch (InvocationTargetException e) {
        e.printStackTrace();
    } catch (NoSuchFieldException e) {
        e.printStackTrace();
    }

    return orientation;
}

现在你可以把它在你的活动：

Now you can call it in your Activity by:

  ExifUtils.rotateBitmap("your Image path here", "your bitmap object here");

编辑：

 public void decodeFile(String filePath) {

    // Decode image size
    BitmapFactory.Options o = new BitmapFactory.Options();
    o.inJustDecodeBounds = true;
    BitmapFactory.decodeFile(filePath, o);

    // The new size we want to scale to
    final int REQUIRED_SIZE = 1024;

    // Find the correct scale value. It should be the power of 2.
    int width_tmp = o.outWidth, height_tmp = o.outHeight;
    int scale = 1;
    while (true) {
        if (width_tmp < REQUIRED_SIZE && height_tmp < REQUIRED_SIZE)
            break;
        width_tmp /= 2;
        height_tmp /= 2;
        scale *= 2;
    }

    // Decode with inSampleSize
    BitmapFactory.Options o2 = new BitmapFactory.Options();
    o2.inSampleSize = scale;
    Bitmap b1 = BitmapFactory.decodeFile(filePath, o2);
    Bitmap b= ExifUtils.rotateBitmap(filePath, b1);

    // image.setImageBitmap(bitmap);
}

现在调用这个方法

  decodeFile(imagepath);

谢谢！

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