喵喵时光机
这是一个完整的解决方案（可从Facebook SDK的Hackbook示例中找到）。它的优点是不需要访问文件本身。如果要从内容解析器加载图像，这将非常有用（例如，如果您的应用正在响应共享照片的意图）。public static int getOrientation(Context context, Uri photoUri) { /* it's on the external media. */ Cursor cursor = context.getContentResolver().query(photoUri, new String[] { MediaStore.Images.ImageColumns.ORIENTATION }, null, null, null); if (cursor.getCount() != 1) { return -1; } cursor.moveToFirst(); return cursor.getInt(0);}然后，您可以如下获得旋转的位图。这段代码还将图片缩小（不幸的是）到MAX_IMAGE_DIMENSION。否则可能会耗尽内存。public static Bitmap getCorrectlyOrientedImage(Context context, Uri photoUri) throws IOException { InputStream is = context.getContentResolver().openInputStream(photoUri); BitmapFactory.Options dbo = new BitmapFactory.Options(); dbo.inJustDecodeBounds = true; BitmapFactory.decodeStream(is, null, dbo); is.close(); int rotatedWidth, rotatedHeight; int orientation = getOrientation(context, photoUri); if (orientation == 90 || orientation == 270) { rotatedWidth = dbo.outHeight; rotatedHeight = dbo.outWidth; } else { rotatedWidth = dbo.outWidth; rotatedHeight = dbo.outHeight; } Bitmap srcBitmap; is = context.getContentResolver().openInputStream(photoUri); if (rotatedWidth > MAX_IMAGE_DIMENSION || rotatedHeight > MAX_IMAGE_DIMENSION) { float widthRatio = ((float) rotatedWidth) / ((float) MAX_IMAGE_DIMENSION); float heightRatio = ((float) rotatedHeight) / ((float) MAX_IMAGE_DIMENSION); float maxRatio = Math.max(widthRatio, heightRatio); // Create the bitmap from file BitmapFactory.Options options = new BitmapFactory.Options(); options.inSampleSize = (int) maxRatio; srcBitmap = BitmapFactory.decodeStream(is, null, options); } else { srcBitmap = BitmapFactory.decodeStream(is); } is.close(); /* * if the orientation is not 0 (or -1, which means we don't know), we * have to do a rotation. */ if (orientation > 0) { Matrix matrix = new Matrix(); matrix.postRotate(orientation); srcBitmap = Bitmap.createBitmap(srcBitmap, 0, 0, srcBitmap.getWidth(), srcBitmap.getHeight(), matrix, true); } return srcBitmap;}