Rotating a view in Android

Question

I have a button that I want to put on a 45 degree angle  For some reason I can t get this to work    Can someone please provide the code to accomplish this

User · Answer

API 11 added a setRotation   method to all views

User · Answer

Ichorus s answer is correct for views  but if you want to draw rotated rectangles or text  you can do the following in your onDraw  or onDispatchDraw  callback for your view    note that theta is the angle from the x axis of the desired rotation  pivot is the Point that represents the point around which we want the rectangle to rotate  and horizontalRect is the rect s position  before  it was rotated   canvas save    canvas rotate theta  pivot x  pivot y   canvas drawRect horizontalRect  paint   canvas restore

User · Answer

if you wish to make it dynamically with an animation  view animate        rotation 180       start     THATS IT

User · Answer

One line in XML     lt View     android rotation  45            gt

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You could create an animation and apply it to your button view  For example          Locate view     ImageView diskView    ImageView  findViewById R id imageView3           Create an animation instance     Animation an   new RotateAnimation 0 0f  360 0f  pivotX  pivotY           Set the animation s parameters     an setDuration 10000                    duration in ms     an setRepeatCount 0                     -1   infinite repeated     an setRepeatMode Animation REVERSE      reverses each repeat     an setFillAfter true                    keep rotation after animation         Aply animation to image view     diskView setAnimation an

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I just used the simple line in my code and it works     myCusstomView setRotation 45     Hope it works for you

User · Answer

Rotating view with rotate   will not affect your view s measured size  As result  rotated view be clipped or not fit into the parent layout  This library fixes it though   https   github com rongi rotate-layout

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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

User · Answer

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  lt appropriate x pivot value gt   lt appropriate y pivot value gt         super onDraw canvas        canvas restore

User · Answer

As mentioned before  the easiest way it to use rotation available since API 11  android rotation  quot 90 quot        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

User · Answer

Joininig  Rudi s and  Pete s answers  I have created an RotateAnimation that keeps buttons functionality also after rotation   setRotation   method preserves buttons functionality   Code Sample   Animation an   new RotateAnimation 0 0f  180 0f  mainLayout getWidth   2  mainLayout getHeight   2        an setDuration 1000                     an setRepeatCount 0                            an setFillAfter false                   DO NOT keep rotation after animation     an setFillEnabled true                  Make smooth ending of Animation     an setAnimationListener new AnimationListener              Override         public void onAnimationStart Animation animation               Override         public void onAnimationRepeat Animation animation               Override         public void onAnimationEnd Animation animation                    mainLayout setRotation 180 0f           Make instant rotation when Animation is finished                                 mainLayout startAnimation an     mainLayout is a  LinearLayout  field

User · Answer

That s simple  in Java  your component setRotation 15     or  your component setRotation 295 18f     in XML   lt Button android rotation  15    gt

User · Answer

Applying a rotation animation  without duration  thus no animation effect  is a simpler solution than either calling View setRotation   or override View onDraw method      substitude deltaDegrees for whatever you want RotateAnimation rotate   new RotateAnimation 0f  deltaDegrees       Animation RELATIVE TO SELF  0 5f  Animation RELATIVE TO SELF  0 5f         prevents View from restoring to original direction   rotate setFillAfter true     someButton startAnimation rotate

[android] Rotating a view in Android

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