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Android: Rotate image in imageview by an angle

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));===>angle to be rotated
Bitmap bMapRotate = Bitmap.createBitmap(bMap, 0, 0,bMap.getWidth(),bMap.getHeight(), mat, true);
iv.setImageBitmap(bMapRotate);


18 Answers
18

Another simple way to rotate an ImageView:
UPDATE:

Required imports:

ImageView

import android.graphics.Matrix;
import android.widget.ImageView;


Code: (Assuming imageView, angle, pivotX & pivotY are already defined)

imageView

angle

pivotX

pivotY

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 & rotate it by adding last two
lines(i.e. postRotate matrix & set it on imageView) in above code
section in your touch listener ACTION_MOVE part.

ImageView

ImageView

ImageView

matrix.postRotate( 180f, imageView.getDrawable().getBounds().width()/2, imageView.getDrawable().getBounds().height()/2);

ImageView

src

getDrawable()

ImageView

background

src

mImageView.setRotation(angle) with API>=11

mImageView.setRotation(angle)

ViewPropertyAnimator

aView.animate().rotation(20).start()

rotationBy()

view.animate().rotationBy(180f).start()

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.

There are two ways to do that:

1 Using Matrix to create a new bitmap:

Matrix

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

RotateAnimation

View

fillAfter=true

duration=0

fromDegrees=toDgrees

<?xml version="1.0" encoding="utf-8"?>
<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"
/>


and Inflate the Animation in code:

Animation rotation = AnimationUtils.loadAnimation(this, R.anim.rotation);
myView.startAnimation(rotation);


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.

imageView.setRotation(angleInDegrees);

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.

15F

setRotation()

setRotation()

30F

Note: This actually works for any subclass of the View object, not just ImageView.

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.

<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">

<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" />
</FrameLayout>


If you have some problems with displaying image, try change code in RotatableImageView.onDraw() method or use draw() method instead.

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);




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

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);


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.

Sadly, I don't think there is. The Matrix class is responsible for all image manipulations, whether it's rotating, shrinking/growing, skewing, etc.

Matrix

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!

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.

RotateableImageView extends ImageView

But if you are going to rotate only a single instance of image view,your solution should be good enough.

without matrix and animated:


img_view = (ImageView) findViewById(R.id.imageView);
rotate = new RotateAnimation(0 ,300);
rotate.setDuration(500);
img_view.startAnimation(rotate);



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);




If you only want to rotate the view visually you can use:

iv.setRotation(float)


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);


Follow the below answer for continuous rotation of an imageview

int i=0;


If rotate button clicked

imageView.setRotation(i+90);
i=i+90;


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);

);


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