libgdx move camera with touch
@Override
public boolean touchDragged(int screenX, int screenY, int pointer) {
//difference between the current pointer location and the last pointer location on X axis
float x = Gdx.input.getDeltaX();
//difference between the current pointer location and the last pointer location on Y axis
float y = Gdx.input.getDeltaY();
camera.translate(-x,y);
return true;
}