java - Android 尝试旋转图像时出现 OutOfMemoryError

Question

我想在屏幕上显示图像(我有一个显示图像的 Activity ):

Bitmap bitmap = BitmapFactory.decodeFile(imagePath);
ExifInterface exif = new ExifInterface(imagePath);
int rotation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
int rotationInDegrees = exifToDegrees(rotation);
Matrix matrix = new Matrix();
matrix.preRotate(rotationInDegrees);
bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);

最后一行抛出 java.lang.OutOfMemoryError

我不明白该怎么做...我必须首先创建位图(BitmapFactory.decodeFile)，但是当我想旋转它时，我必须已经提供源位图 - 如何避免它？

谢谢

Answer 1

您可以在位图选项中添加 inSampleSize 来尝试先缩小图像尺寸，然后再进行解码。如文件所述:http://developer.android.com/reference/android/graphics/BitmapFactory.Options.html#inSampleSize

If set to a value > 1, requests the decoder to subsample the original image, returning a smaller image to save memory.

BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 5;
Bitmap bitmap = BitmapFactory.decodeFile(imagePath, options);

希望有帮助。