最近一直在做一個掃描的專案，用zxing實現二維碼的掃描，需求要實現拍照並且掃描名片，發現拍照出來的照片是旋轉的。一直找原因找不到，在國外一個論壇看到說是camera獲取data資料是橫向的，沒有經過處理所以顯示就是旋轉的。想了好久還是不會實現data的旋轉，索性就將bitmap進行旋轉以達到正面顯示的效果吧。下面看程式碼：

Camera.PictureCallback myJpegCallback = new Camera.PictureCallback() {
    @Override
public void onPictureTaken(byte[] data, Camera camera) {
        Bitmap bitmap_cc = BitmapFactory.decodeByteArray
 
(data, 0, data.length);
Matrix m = new Matrix();
m.setRotate(90,(float) bitmap_cc.getWidth() / 2, (float) bitmap_cc.getHeight() / 2);
        final Bitmap bm = Bitmap.createBitmap(bitmap_cc, 0, 0, bitmap_cc.getWidth(), bitmap_cc.getHeight(), m, true);
String name = new DateFormat().format("yyyyMMdd_hhmmss"
 
, Calendar.getInstance(Locale.CHINA)) + ".jpg";
File file = new File("/storage/emulated/0/DCIM/Camera_scanning/");
file.mkdirs();
File newFile = new File(file, name);
String fileName = "/storage/emulated/0/DCIM/Camera_scanning/" + name;
        try {
            FileOutputStream outputStream = new FileOutputStream(newFile)
 
;
bm.compress(Bitmap.CompressFormat.JPEG, 100, outputStream);
outputStream.close();
} catch (IOException e) {
            e.printStackTrace();
}Log.d("MainActivity", "data.length:" + data.length);
Log.d("MainActivity", fileName);}
};