简单列表视图崩溃应用

我在对话框中有一个简单的编辑文本，在输入一些文本后单击确定，在一个片段中有一个列表视图，我需要将该文本添加到片段中的列表视图中。

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

这是我的家居片段：

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.app.Fragment;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;

public class HomeFragment extends Fragment {
    public HomeFragment(){}
    ListView lv;
    List<String> li;
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_home, container, false);
        lv = (ListView) getView().findViewById(R.id.itemslistView);
        li=new ArrayList<String>();
        li.add("Apple");
        li.add("Mango");
        li.add("Orange");
        ArrayAdapter<String> adp=new ArrayAdapter<String> 
        (getActivity().getApplicationContext(),R.layout.list,li);
        lv.setAdapter(adp);
      return rootView;
    }
}

当我运行此程序时，应用程序崩溃了，并且在logcat中没有收到任何错误。

这是我的input_dialog：

protected void showInputDialog() {

        // get prompts.xml view
        LayoutInflater layoutInflater = LayoutInflater.from(MainActivity.this);
        View promptView = layoutInflater.inflate(R.layout.input_dialog, null);
        AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
                MainActivity.this);
        alertDialogBuilder.setView(promptView);

        // setup a dialog window
        alertDialogBuilder
                .setCancelable(false)
                .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        dialog.cancel();
                    }
                })
                .setNegativeButton("Cancel",
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int id) {
                                dialog.cancel();
                            }
                        });

        // create an alert dialog
        AlertDialog alert = alertDialogBuilder.create();
        alert.show();

    }

这是我的家庭片段：

    public class HomeFragment extends Fragment {
    public HomeFragment() {
    }

    ListView lv;
    List<String> li;

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

        View rootView = inflater.inflate(R.layout.fragment_home, container,
                false);
        lv = (ListView) rootView.findViewById(R.id.itemslistView);

        View editView = inflater.inflate(R.layout.input_dialog, container,
                false);
        EditText edit = (EditText) editView.findViewById(R.id.txtlist);
        String ItemName = edit.getText().toString();
        lv = (ListView) getView().findViewById(R.id.itemslistView);
        li = new ArrayList<String>();
        li.add(ItemName);
        ArrayAdapter<String> adp = new ArrayAdapter<String>(getActivity()
                .getApplicationContext(), R.layout.list, li);
        lv.setAdapter(adp);
        return rootView;

    }
}