Oto kod bazowy załadować bitmapę i obrócić go w lewo lub w prawo:
// 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);
Teraz idź i używać rSprite i lSprite.
Oto pełna próbka że faktycznie wyciąga bitmapy na ekranie:
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);
}
}
}
Patrz odpowiedź tutaj : http://stackoverflow.com/questions/13099652/custom-rotating-of-an-image-view – AYBABTU