android - 直接在 Android 中设置 ImageView 方向？

Question

我知道我可以ImageView在 Android 中通过

matrix.postRotate(finalOrientation - initOrientation, width, height);

但我想将其设置为finalOrientation直接，而不是按差异旋转它，finalOrientation - initOrientation.

所以我期待类似的东西：

matrix.setOrientation(finalOrientation);

我怎样才能做到这一点？

Answer 1

完美的！谢谢@Bette Devine！为了方便，我做了一个函数。

public Bitmap rotateBmp(Bitmap bmp){
    Matrix matrix = new Matrix();
    //set image rotation value to 90 degrees in matrix.
    matrix.postRotate(90);
    //supply the original width and height, if you don't want to change the height and width of bitmap.
    bmp = Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(),bmp.getHeight(), matrix, true);
    return bmp;
}

我不得不用缩小的图像来做到这一点。当我尝试使用全尺寸图像执行此操作时，出现“java.lang.OutOfMemoryError”。: (

Answer 2

Matrix matrix = new Matrix();
//set image rotation value to 90 degrees in matrix.
matrix.postRotate(90);
//supply the original width and height, if you don't want to change the height and width of bitmap.
Bitmap bMapRotate = Bitmap.createBitmap(bMap, 0, 0, newWidth, newHeight, matrix, true);

Answer 3

请参考以下链接：

http://docs.xamarin.com/guides/android/application_fundamentals/handling_rotation/