不兼容的片段类型

Question

嗨，我在 android 中有一个小应用程序，我在其中使用带有导航抽屉的片段作为菜单。但是现在我想在用户点击某些东西时显示在我的片段对话框弹出窗口中，并且出现以下错误：

MainActivity：

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");
    }
}

我在 fragment = new HomeFragment(); >>不兼容的类型上遇到的第一个错误。

在 onCreateView 方法 >> 方法的第二个错误 HomeFragment 没有覆盖或实现超类型中的方法

HomeFragment：

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");
}

}

DialogFragmentAlergeny：

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();
}

}

Answer 1

如何解决：

1. HomeFragment 必须扩展 Fragment
2. 您必须在任何需要的地方使用/导入android.support.v4.app.Fragment、android.support.v4.app.DialogFragment、android.support.v4.app.FragmentActivity。
3. newFragment.show(getActivity().getSupportFragmentManager(), "dialog"); 使用 getsupportManager 而不是 FragmentManager()
4. 使用FragmentManager fragmentManager = getSupportFragmentManager(); 而不是FragmentManager()

这就是所有的帮助。

Answer 2

HomeFragment 不是一个片段，而是一个 FragmentActivity...更改将类扩展为 Fragment

public class HomeFragment extends FragmentActivity { ... }