Android Rotate image in imageview by an angle

Question

I am using the following code to rotate a image in ImageView by an angle  Is there any simpler and less complex method available   ImageView iv    ImageView findViewById imageviewid   TextView tv    TextView findViewById txtViewsid   Matrix mat   new Matrix    Bitmap bMap   BitmapFactory decodeResource getResources   imageid   mat postRotate Integer parseInt degree       gt angle to be rotated Bitmap bMapRotate   Bitmap createBitmap bMap  0  0 bMap getWidth   bMap getHeight    mat  true   iv setImageBitmap bMapRotate

User · Answer

I know this is insanely late  but it was helpful for me so it may help others    As of API 11  you can set the absolute rotation of an ImageView programmatically by using the imageView setRotation angleInDegrees   method    By absolute  I mean you can repeatedly call this function without having to keep track of the current rotation  Meaning  if I rotate by passing 15F to the setRotation   method  and then call setRotation   again with 30F  the image s rotation with be 30 degrees  not 45 degrees    Note  This actually works for any subclass of the View object  not just ImageView

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mImageView setRotation angle  with API  11

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Try this code 100  working   On rotate button click write this code            Override         public void onClick View view                if bitmap  null                   Toast makeText getApplicationContext     Image photo is not yet set   Toast LENGTH LONG  show                              else                   Matrix matrix   new Matrix                    ivImageProduct setScaleType ImageView ScaleType MATRIX       required                 matrix postRotate 90 ivImageProduct getDrawable   getBounds   width   2 ivImageProduct getDrawable   getBounds   height   2                   Bitmap bmp Bitmap createBitmap bitmap  0  0 bitmap getWidth    bitmap getHeight    matrix  true                   bitmap recycle                    bitmap bmp                  ivImageProduct setImageBitmap bitmap

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I have a solution to this  Actually it is a solution to a problem that arises after rotation Rectangular image doesn t fit ImagView  but it covers your problem too   Although this Solution has Animation for better or for worse      int h w      Boolean safe true    Getting the parameters of imageView is not possible at initialisation of activity To do so please refer to this solution OR set the dimensions at onClick of a Button Like this      rotateButton setOnClickListener new View OnClickListener              Override         public void onClick View view                if imageView getRotation   90 2  0                   h imageView getHeight                    w imageView getWidth                                        Insert the code Snippet below here             And the code to be run when we want to rotate ImageView  if safe       imageView animate   rotationBy 90  scaleX imageView getRotation   90 2  0  w 1 0f h  1  scaleY imageView getRotation   90 2  0  w 1 0f h  1  setDuration 2000  setInterpolator new LinearInterpolator    setListener new Animator AnimatorListener                      Override                 public void onAnimationStart Animator animation                          safe false                                      Override                 public void onAnimationEnd Animator animation                          safe true                                       Override                 public void onAnimationCancel Animator animation                                         Override                 public void onAnimationRepeat Animator animation                                      start                        This solution is sufficient for the Problem above Although it will shrink the imageView even if it is not necessary when height is smaller than Width  If it bothers you you can add another ternary operator inside scaleX scaleY

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without matrix and animated         img view    ImageView  findViewById R id imageView       rotate   new RotateAnimation 0  300       rotate setDuration 500       img view startAnimation rotate

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Rotate an image in android with delay   imgSplash animate   rotationBy 360f  setDuration 3000  setInterpolator new LinearInterpolator    start

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Matrix matrix   new Matrix    imageView setScaleType ImageView ScaleType MATRIX     required matrix postRotate  float  20  imageView getDrawable   getBounds   width   2  imageView getDrawable   getBounds   height   2   imageView setImageMatrix matrix     how to use   public class MainActivity extends AppCompatActivity      int view   R layout activity main     TextView textChanger     ImageView imageView      RequiresApi api   Build VERSION CODES JELLY BEAN      Override    protected void onCreate Bundle savedInstanceState          super onCreate savedInstanceState         setContentView view         textChanger   findViewById R id textChanger         imageView findViewById R id imageView         textChanger setOnClickListener new View OnClickListener               Override          public void onClick View v                roateImage imageView                                private void roateImage ImageView imageView          Matrix matrix   new Matrix          imageView setScaleType ImageView ScaleType MATRIX     required       matrix postRotate  float  20  imageView getDrawable   getBounds   width   2     imageView getDrawable   getBounds   height   2         imageView setImageMatrix matrix

User · Answer

Can also be done this way -  imageView animate   rotation 180  start      got from here

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Also  if you want to rotate an ImageView by 180 degrees vertically or horizontally  you can use scaleY or scaleX properties and set them to -1f  Here is a Kotlin example   imageView scaleY   -1f imageView scaleX   -1f   1f value is used to return an ImageView to its normal state   imageView scaleY   1f imageView scaleX   1f

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Sadly  I don t think there is  The Matrix class is responsible for all image manipulations  whether it s rotating  shrinking growing  skewing  etc   http   developer android com reference android graphics Matrix html  My apologies  but I can t think of an alternative  Maybe someone else might be able to  but the times I ve had to manipulate an image I ve used a Matrix   Best of luck

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If you re supporting API 11 or higher  you can just use the following XML attribute   android rotation  90    It might not display correctly in Android Studio xml preview  but it works as expected

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There are two ways to do that   1 Using Matrix to create a new bitmap   imageView    ImageView  findViewById R id imageView   Bitmap myImg   BitmapFactory decodeResource getResources    R drawable image    Matrix matrix   new Matrix    matrix postRotate 30    Bitmap rotated   Bitmap createBitmap myImg  0  0  myImg getWidth    myImg getHeight            matrix  true    imageView setImageBitmap rotated     2 use RotateAnimation on the View you want to Rotate  and make sure the Animation set to fillAfter true  duration 0  and fromDegrees toDgrees    lt  xml version  1 0  encoding  utf-8   gt   lt rotate   xmlns android  http   schemas android com apk res android    android fromDegrees  45    android toDegrees  45    android pivotX  50     android pivotY  50     android duration  0    android startOffset  0    gt    and Inflate the Animation in code   Animation rotation   AnimationUtils loadAnimation this  R anim rotation   myView startAnimation rotation

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Another possible solution is to create your own custom Image view say RotateableImageView extends ImageView     and override the onDraw   to rotate either the canvas bitmaps before redering on to the canvas Don t forget to restore the canvas back   But if you are going to rotate only a single instance of image view your solution should be good enough

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Follow the below answer for continuous rotation of an imageview  int i 0    If rotate button clicked  imageView setRotation i 90   i i 90

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For Kotlin    mImageView rotation   90f   angle in float   This will rotate the imageView rather than rotating the image  Also  though its a method in View class  So you can pretty much rotate any view using it

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just write this in your onactivityResult              Bitmap yourSelectedImage  BitmapFactory decodeFile filePath               Matrix mat   new Matrix                mat postRotate  270      degree how much you rotate i rotate 270             Bitmap bMapRotate Bitmap createBitmap yourSelectedImage  0 0 yourSelectedImage getWidth   yourSelectedImage getHeight    mat  true               image setImageBitmap bMapRotate               Drawable d new BitmapDrawable yourSelectedImage               image setBackground d

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Another simple way to rotate an ImageView  UPDATE  Required imports     import android graphics Matrix  import android widget ImageView    Code   Assuming imageView  angle  pivotX  amp  pivotY are already defined   Matrix matrix   new Matrix    imageView setScaleType ImageView ScaleType MATRIX       required matrix postRotate  float  angle  pivotX  pivotY   imageView setImageMatrix matrix     This method does not require creating a new bitmap each time        NOTE  To rotate an ImageView on ontouch at runtime you can   set onTouchListener on ImageView  amp  rotate it by adding last two   lines i e  postRotate matrix  amp  set it on imageView  in above code   section in your touch listener ACTION MOVE part

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This is my implementation of RotatableImageView  Usage is very easy  just copy attrs xml and RotatableImageView java into your project and add RotatableImageView to your layout  Set desired rotation angle using example angle parameter    lt FrameLayout xmlns android  http   schemas android com apk res android      xmlns example  http   schemas android com apk res com example      android layout width  match parent      android layout height  wrap content  gt        lt com example views RotatableImageView         android id    id layout example image          android layout width  wrap content          android layout height  wrap content          android adjustViewBounds  true          android scaleType  fitCenter          android src   drawable ic layout arrow          example angle  180    gt   lt  FrameLayout gt    If you have some problems with displaying image  try change code in RotatableImageView onDraw   method or use draw   method instead

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You can simply use rotation atribute of ImageView Below is the attribute from ImageView with details from Android source  lt  -- rotation of the view  in degrees  -- gt   lt attr name  quot rotation quot  format  quot float quot    gt

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try this  on a custom view  public class DrawView extends View         public DrawView Context context AttributeSet attributeSet           super context  attributeSet               Override     public void onDraw Canvas canvas              Canvas c new Canvas BitmapFactory decodeResource getResources    R drawable new minute1                 c rotate 45              canvas drawBitmap BitmapFactory decodeResource getResources    R drawable new minute1   0  0  null           canvas rotate 45

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If you only want to rotate the view visually you can use    iv setRotation float

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here s a nice solution for putting a rotated drawable for an imageView   Drawable getRotateDrawable final Bitmap b  final float angle        final BitmapDrawable drawable   new BitmapDrawable getResources    b             Override         public void draw final Canvas canvas                canvas save                canvas rotate angle  b getWidth     2  b getHeight     2               super draw canvas               canvas restore                         return drawable      usage   Bitmap b     float angle     final Drawable rotatedDrawable   getRotateDrawable b angle   root setImageDrawable rotatedDrawable     another alternative   private Drawable getRotateDrawable final Drawable d  final float angle        final Drawable   arD     d        return new LayerDrawable arD             Override         public void draw final Canvas canvas                canvas save                canvas rotate angle  d getBounds   width     2  d getBounds   height     2               super draw canvas               canvas restore                         also  if you wish to rotate the bitmap  but afraid of OOM  you can use an NDK solution i ve made here

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if u want to rotate an image by 180 degrees then put these two value in imageview tag -  android scaleX  -1  android scaleY  -1    Explanation - scaleX   1 and scaleY   1 repesent it s normal state but if we put -1 on scaleX scaleY property then it will be rotated by 180 degrees

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Rather than convert image to bitmap and then rotate it try to rotate direct image view like below code   ImageView myImageView    ImageView findViewById R id my imageview    AnimationSet animSet   new AnimationSet true   animSet setInterpolator new DecelerateInterpolator     animSet setFillAfter true   animSet setFillEnabled true    final RotateAnimation animRotate   new RotateAnimation 0 0f  -90 0f      RotateAnimation RELATIVE TO SELF  0 5f       RotateAnimation RELATIVE TO SELF  0 5f    animRotate setDuration 1500   animRotate setFillAfter true   animSet addAnimation animRotate    myImageView startAnimation animSet

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I think the best method     int angle   0  imageView setOnClickListener new View OnClickListener              Override         public void onClick View v                angle   angle   90              imageView setRotation angle

[android] Android: Rotate image in imageview by an angle

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