如何在Android中位圖壓縮後保存Exif數據 (How to save Exif data after bitmap coppression in Android)

問題描述

如何在Android中位圖壓縮後保存Exif數據 (How to save Exif data after bitmap coppression in Android)

我需要從 sd 卡中獲取圖像，創建、旋轉和保存更改的圖像。我嘗試使用此代碼

Bitmap original = BitmapFactory.decodeFile(file.getAbsolutePath());

    ExifInterface originalExif = new ExifInterface(file.getAbsolutePath());
    int orientation = originalExif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_UNDEFINED);

    Matrix matrix = new Matrix();
    int rotate = 90;
    if(orientation == ExifInterface.ORIENTATION_ROTATE_90){
        rotate = 180;
    }else if(orientation == ExifInterface.ORIENTATION_ROTATE_180){
        rotate = 270;
    }else if(orientation == ExifInterface.ORIENTATION_ROTATE_270){
        rotate = 0;
    }

    matrix.postRotate(rotate);

    Bitmap bitmap = Bitmap.createBitmap(original, 0, 0, original.getWidth(), original.getHeight(), matrix, true);

    try {
        FileOutputStream out = new FileOutputStream(file);
        bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
        out.flush();
        out.close();

    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        original.recycle();
        bitmap.recycle();
    }


    ExifInterface newExif = new ExifInterface(file.getAbsolutePath());

    newExif.setAttribute(ExifInterface.TAG_ORIENTATION, String.valueOf(ExifInterface.ORIENTATION_ROTATE_90));

    newExif.saveAttributes();

但我無法在 ExifInterface 中保存更改。這只是清除所有標籤。

參考解法

方法 1:

saveAttributes method only Save the tag data into the JPEG file.

check this link

http://developer.android.com/reference/android/media/ExifInterface.html#saveAttributes()

So if you change your code this

bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);

to this

bitmap.compress(Bitmap.CompressFormat.JPEG, 100, out);

it will save you exif tag data

Hope this help

Let me know in case of any other issue

(by couldDog、Sandy)

參考文件

1. How to save Exif data after bitmap coppression in Android (CC BY‑SA 2.5/3.0/4.0)