Activity公用跳转到主Activity

public class VSession {

    private VSession() {
    }

    public static VSession getInstance() {
        if (session == null)
            session = new VSession();
        return session;
    }

    // 跳转到主Activity
    public void exit(Activity activity) {
        Intent intent = new Intent(activity, MainActivity.class);
        activity.startActivity(intent);
        activity.overridePendingTransition(R.anim.push_right_in,R.anim.push_right_out);
        activity.finish();
    }

}

VSession.getInstance().exit(TextActivity.this);