不兼容的片段类型

你好，我在 android 中有一个小应用程序，我在其中使用带导航抽屉的片段作为菜单。但现在我想在用户单击某些内容时在片段对话框弹出窗口中显示，并且出现以下错误：

主要活动：

private void displayView(int position) {
    // update the main content by replacing fragments
    Fragment fragment = null;
    switch (position) {
        case 0:
            fragment = new HomeFragment();
            break;
        case 1:
            fragment = new FindPeopleFragment();
            break;
        default:
            break;
    }

    if (fragment != null) {
        FragmentManager fragmentManager = getFragmentManager();
        fragmentManager.beginTransaction()
                .replace(R.id.frame_container, fragment).commit();

        // update selected item and title, then close the drawer
        mDrawerList.setItemChecked(position, true);
        mDrawerList.setSelection(position);
        setTitle(navMenuTitles[position]);
        mDrawerLayout.closeDrawer(mDrawerList);
    } else {
        // error in creating fragment
        Log.e("MainActivity", "Error in creating fragment");
    }
}

我遇到的第一个错误片段=新的HomeFragment(); >>不兼容的类型.

HomeFragment 上的第二个错误位于onCreateView方法>> 方法不会覆盖或实现超类型的方法

主页片段：

public class HomeFragment extends FragmentActivity {

public HomeFragment(){}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    View rootView = inflater.inflate(R.layout.fragment_home, container, false);
    final RelativeLayout rlPolievkaShowDialog=(RelativeLayout)rootView.findViewById(R.id.rlPolievkaButton);
    rlPolievkaShowDialog.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
        }

    });
    return rootView;
}

private void showDialog() {
    DialogFragment newFragment = DialogFragmentAlergeny.newInstance();
    newFragment.show(getSupportFragmentManager(), "dialog");
}

}

DialogFragment 警报：

public class DialogFragmentAlergeny extends DialogFragment {

public static DialogFragmentAlergeny newInstance() {
    DialogFragmentAlergeny frag = new DialogFragmentAlergeny();
    return frag;
}

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(getActivity());
    View view = getActivity().getLayoutInflater().inflate(R.layout.alergeny_dialog, null);
    alertDialogBuilder.setView(view);
    alertDialogBuilder.setTitle(getString(R.string.alergeny_dialog_title));
    alertDialogBuilder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
    dialog.dismiss();
        }
    });
    return alertDialogBuilder.create();
}

}

如何解决：

1. HomeFragment 必须扩展 Fragment
2. 您必须使用/导入android.support.v4.app.Fragment, android.support.v4.app.DialogFragment, android.support.v4.app.FragmentActivity任何需要的地方。
3. newFragment.show(getActivity().getSupportFragmentManager(), "dialog"); use getsupportManager not FragmentManager()
4. Use FragmentManager fragmentManager = getSupportFragmentManager(); not FragmentManager()

这就是全部，谢谢大家的帮助。