Rotating a view in Android

API 11 added a setRotation() method to all views.

Extend the TextView class and override the onDraw() method. Make sure the parent view is large enough to handle the rotated button without clipping it.

@Override
protected void onDraw(Canvas canvas) {
     canvas.save();
     canvas.rotate(45,<appropriate x pivot value>,<appropriate y pivot value>);
     super.onDraw(canvas);
     canvas.restore();

} 

I just used the simple line in my code and it works :

myCusstomView.setRotation(45);

Hope it works for you.

As mentioned before, the easiest way it to use rotation available since API 11:

android:rotation="90"    // in XML layout

view.rotation = 90f      // programatically

You can also change pivot of rotation, which is by default set to center of the view. This needs to be changed programatically:

// top left
view.pivotX = 0f
view.pivotY = 0f

// bottom right
view.pivotX = width.toFloat()
view.pivotY = height.toFloat()

...

In Activity's onCreate() or Fragment's onCreateView(...) width and height are equal to 0, because the view wasn't measured yet. You can access it simply by using doOnPreDraw extension from Android KTX, i.e.:

view.apply {
    doOnPreDraw {
        pivotX = width.toFloat()
        pivotY = height.toFloat()
    }
}

if you wish to make it dynamically with an animation:

view.animate()
    .rotation(180)
    .start();

THATS IT

fun rotateArrow(view: View): Boolean {
    return if (view.rotation == 0F) {
        view.animate().setDuration(200).rotation(180F)
        true
    } else {
         view.animate().setDuration(200).rotation(0F)
         false
    }
}

That's simple, in Java

your_component.setRotation(15);

or

your_component.setRotation(295.18f);

in XML

<Button android:rotation="15" />