Android:从抽屉导航中打开 fragment

Question

我创建了一个抽屉导航和一个 fragment ，我试图从抽屉导航中打开该 fragment ，但没有任何反应，请提供任何帮助..

@Override
public void onNavigationDrawerItemSelected(int position) {
    // update the main by replacing fragments
    Fragment fragment;
    switch(position){
        case 0: //search//todo
            break;
        case 1: //stats
            break;
        case 2: //my account //todo
            break;
        case 3: //settings //todo
            break;
        case 4: //location //todo
            fragment = getFragmentManager().findFragmentByTag(LocationFragment.TAG);
            if (fragment == null) {
                fragment = new LocationFragment();
            }
            getFragmentManager().beginTransaction().replace(R.id.container, fragment, LocationFragment.TAG).commit();
            break;
    }

Answer 1

我更改了您的一些代码，这应该可以。如果出现任何问题，请随时发表评论。您找不到您的 Location fragment ，因为您没有为它设置 setTag。

@Override
public void onNavigationDrawerItemSelected(int position) {
    // update the main by replacing fragments
    Fragment fragment;
    String fragmentName;
    switch(position) {
        case 0: //search//todo
            fragment = new SearchFragment();
            fragmentName = "SearchFragment";
            break;
        case 1: //stats
            fragment = new StatFragment();
            fragmentName = "StatFragment";
            break;
        case 2: //my account //todo
            fragment = new MyAccountFragment();
            fragmentName = "MyAccountFragment";
            break;
        case 3: //settings //todo
            fragment = new SettingsFragment();
            fragmentName = "SettingsFragment";
            break;
        case 4: //location //todo
            fragment = new LocationFragment();
            fragmentName = "LocationFragment";
            break;
    }
    if (fragment != null) {
        FragmentManager fragmentManager = getSupportFragmentManager();
        fragmentManager.beginTransaction().replace(R.id.container, fragment, fragmentName).commit();
        mDrawerList.setItemChecked(position, true);
        mDrawerList.setSelection(position);
        mDrawerLayout.closeDrawer(mDrawerRelativeLayout);
    } else {
        mDrawerLayout.closeDrawer(mDrawerRelativeLayout);
    }
}