Rotate image in android

Question

I want rotate image in both the ways Clockwise as well as Anti clock wise. I had try but not rotate image both the way, so plz give me solution for my problem if you know..

Answer 1

Here is the base code to load a bitmap and rotate it left or right:

// Load a bitmap from a drawable, make sure this drawable exists in your project
Bitmap sprite = BitmapFactory.decodeResource(this.getResources(),
        R.drawable.ic_launcher);

// Create two matrices that will be used to rotate the bitmap
Matrix rotateRight = new Matrix();
Matrix rotateLeft = new Matrix();

// Set the matrices with the desired rotation 90 or -90 degrees
rotateRight.preRotate(90);
rotateLeft.preRotate(-90);

// Create bitmaps based on the loaded bitmap 'sprite' and apply one of
// the rotation matrices
Bitmap rSprite = Bitmap.createBitmap(sprite, 0, 0,
        sprite.getWidth(), sprite.getHeight(), rotateRight, true);
Bitmap lSprite = Bitmap.createBitmap(sprite, 0, 0,
        sprite.getWidth(), sprite.getHeight(), rotateLeft, true);

Now go and use rSprite and lSprite.

Here is a full sample that actually draws the bitmaps to screen:

public class MainActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(new drawView(this));
    }

    private class drawView extends View{
        public drawView(Context context){
            super(context);
        }

        @Override
        protected void onDraw(Canvas canvas) {
            super.onDraw(canvas);

            // Load a bitmap from a drawable, make sure this drawable exists in your project
            Bitmap sprite = BitmapFactory.decodeResource(this.getResources(),
                    R.drawable.ic_launcher);

            // Create two matrices that will be used to rotate the bitmap
            Matrix rotateRight = new Matrix();
            Matrix rotateLeft = new Matrix();

            // Set the matrices with the desired rotation 90 or -90 degrees
            rotateRight.preRotate(90);
            rotateLeft.preRotate(-90);

            // Create bitmaps based on the loaded bitmap 'sprite' and apply one of
            // the rotation matrices
            Bitmap rSprite = Bitmap.createBitmap(sprite, 0, 0,
                    sprite.getWidth(), sprite.getHeight(), rotateRight, true);
            Bitmap lSprite = Bitmap.createBitmap(sprite, 0, 0,
                    sprite.getWidth(), sprite.getHeight(), rotateLeft, true);

            //Draw the first unrotated sprite at the top left of the screen
            canvas.drawBitmap(sprite, 0, 0, null);

            //Draw the rotated right sprite on the 2nd row
            canvas.drawBitmap(rSprite, 0, sprite.getHeight() + 5, null);

            //Draw the rotated left sprite on the 3rd row
            canvas.drawBitmap(lSprite, 0, sprite.getHeight() * 2 + 5, null);
        }
    }
}