照片选择器。肖像变成景观 [英] Photo picker. Portrait turns to landscape

问题描述

<一个href=\"http://stackoverflow.com/questions/2507898/how-to-pick-an-image-from-gallery-sd-card-for-my-app-in-android\">How从画廊（SD卡）为我在Android应用程序中选择一个图片？

我已经实现了第二个答案（同下采样）。当我在肖像选择一个图像，图像将在横向模式下显示..有谁知道这是为什么？而如何解决这一问题？在此先感谢！

I have implemented the second answer (With the downsampling). When I select an image in portrait, the image will be shown in landscape mode.. Does anybody know why this is? And how to fix this? Thanks in advance!

P.S。对不起，我做了一个新的话题了这一点，但海报保护了他的话题对新手和我一样：）

P.s. Sorry I've made a new topic out of this but the poster protected his topic against newbies like me :)

推荐答案

您必须得到图片的EXIF旋转，这样并据此安排youur位图

You have to get the exif rotation of the pic, like this and arrange youur bitmap accordingly

public static int getExifRotation(String imgPath) 
{
    try 
    {
        ExifInterface exif = new ExifInterface(imgPath);
        String rotationAmount = exif.getAttribute(ExifInterface.TAG_ORIENTATION);
        if (!TextUtils.isEmpty(rotationAmount)) 
        {
            int rotationParam = Integer.parseInt(rotationAmount);
            switch (rotationParam) 
            {
                case ExifInterface.ORIENTATION_NORMAL:
                    return 0;
                case ExifInterface.ORIENTATION_ROTATE_90:
                    return 90;
                case ExifInterface.ORIENTATION_ROTATE_180:
                    return 180;
                case ExifInterface.ORIENTATION_ROTATE_270:
                    return 270;
                default:
                    return 0;
            }
        } 
        else 
        {
            return 0;
        }
    }
    catch (Exception ex) 
    {
        return 0;
    }
}

得到的图片的路径

get the path of the picture

public String getPath(Uri uri) {
    String[] projection = { MediaStore.Images.Media.DATA };
    Cursor cursor = managedQuery(uri, projection, null, null, null);
    int column_index = cursor
            .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
    cursor.moveToFirst();
    return cursor.getString(column_index);
}

细做矩阵，使用了一个矩阵位图构造

Thin make a matrix and use bitmap constructor that uses matrix

Matrix matrix = new Matrix();
matrix.preRotate(90); 
// or
matrix.postRotate(90);

所以你的onActivityResult里面你应该有这样的事情

so inside your onActivityResult you should have something like this

 Uri selectedImageUri = data.getData();

                selectedImagePath = getPath(selectedImageUri);
                orientation = getExifRotation(selectedImagePath);


                Matrix matrix = new Matrix();
                matrix.postRotate(90);
               if(orientation == 90){
                   bitmap = Bitmap.createBitmap(bitmap, 0, 0, 
                            bitmap.getWidth(), bitmap.getHeight(), 
                            matrix, true);}

请确保您重新取样的图像，虽然第一，所以他是如何在他的答案，然后再做到这一点。

make sure you resample your image first though, so how he has it in his answer first and then do this

这篇关于照片选择器。肖像变成景观的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！