从活动中删除片段

FragmantClass rSum = new FragmantClass();
getSupportFragmentManager().beginTransaction().remove(rSum).commit();       

当我加载切换另一个片段时，我试图删除这个片段。上面的片段不会被删除。这是我调用来切换片段的方法。

public void switchContent(Fragment fragment) {
    FragmantClass rSum = new FragmantClass();
    getSupportFragmentManager().beginTransaction().remove(rSum).commit();
    mContent = fragment;
    getSupportFragmentManager()
        .beginTransaction()
        .replace(R.id.content_frame, fragment)
        .commit();
    getSlidingMenu().showContent();
}

getSupportFragmentManager().beginTransaction().
remove(getSupportFragmentManager().findFragmentById(R.id.frame)).commit();

试试这个，它应该有效。

public void switchContent(Fragment fragment) {
    Fragment oldFragment = getSupportFragmentManager().findFragmentById(R.id.frame);
    if (oldFragment != null) { 
        getSupportFragmentManager().beginTransaction()
            .remove(oldFragment).commit();
    }
    mContent = fragment;
    getSupportFragmentManager()
        .beginTransaction()
        .replace(R.id.content_frame, fragment)
        .commit();
    getSlidingMenu().showContent();
}