Rotate around alternate axis

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I am struggling with bitmap rotations. I wish to rotate a graphic around an alternate axis but I can only ever get it to rotate around the center point no matter what I do, putting in postTranlate. preTranslate, set Translate in any order doesnt work I have also tried the postRotate(45,0,0) but it always rotates around the center. Code below taken of internet what would I do to alter its rotation point, the code below uses the launcher icon which is square I am using a long thin graphic like an arrow. Thanks

// Rotate image to 45 degrees.

public void RotateImage(){
    ImageView image;
    Bitmap bMap;
    Matrix matrix;

    //Get ImageView from layout xml file
    image = (ImageView) findViewById(R.id.imageView1);

    //Decode Image using Bitmap factory.
    bMap = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);

    //Create object of new Matrix.
    matrix = new Matrix();

    //set image rotation value to 45 degrees in matrix.
    matrix.postRotate(45);

    //Create bitmap with new values.
    Bitmap bMapRotate = Bitmap.createBitmap(bMap, 0, 0,
            bMap.getWidth(), bMap.getHeight(), matrix, true);

    //put rotated image in ImageView.
    image.setImageBitmap(bMapRotate);
}

asked 28 secs ago

user3129787

1

Rotate around alternate axis