Rotating an image around a pivot point

Question

The issue is simple: I want to rotate an image around a certain pivot point. Here is the code I use:

Matrix matrix = new Matrix();
matrix.setTranslate(bmpWidth/2, 0);
matrix.preRotate(degrees, bmpWidth/2, 0);

Bitmap resizedBitmap = Bitmap.createBitmap(
    bitmap, 0, 0, bmpWidth, bmpHeight, matrix, true);
ImageView imageView = (ImageView) findViewById(R.id.bell);
imageView.setImageBitmap(resizedBitmap);

I get the rotation degrees from the accelerometer sensor. The result is that every time the image is rotated around its center point.

Answer 1

I think you should try doing this:

imageView.setPivotX(desiredXPivotPoint);
imageView.setPivotY(desiredYPivotPoint);

That should do the trick.

Answer 2

这有点旧，但有一个功能允许您指定旋转度和枢轴点：

    imageView.setRotation(degrees, px, py)