SettingsActivity.java 文件源码

protected void showFragment(String tag, boolean addToBackStack) {
    PreferenceFragment fragment = (PreferenceFragment) getFragmentManager().findFragmentByTag(tag);
    if (fragment == null) {
        switch (tag) {
            case SettingsFragmentMaster.TAG:
            default:
                fragment = new SettingsFragmentMaster();
                toolbar.setTitle(R.string.settings);
                break;
        }
    }
    FragmentTransaction t = getFragmentManager().beginTransaction();
    if (addToBackStack) {
        t.addToBackStack(tag);
    }
    t.replace(R.id.settings__fragment_container, fragment, tag).commit();
}