当显示到listview android studio时无法将项目分开

Question

我正在学习Android，到目前为止我已经开始创建联系人列表了。该列表使用SQLlight存储，但是当我尝试在ListView中显示信息时，每个联系人都显示在同一部分中。

我得到的结果是..

联系1

联络2

联系3

.......................

而不是..

联系1

.........................

联络2

.........................

联系3

.........................

public class MainActivityFragment extends Fragment {
DatabaseHelper mydb;
ArrayAdapter<String> adapter;
private static ListView listView;


public MainActivityFragment() {
}

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

    mydb = new DatabaseHelper(getActivity());

    adapter = new ArrayAdapter<>(
            //gets information about MainActivity/ this fragment's parent activity
            getActivity(),
            //Id for contact item layout
            R.layout.contact_list_item,
            //gets the arraylist of contacts
            getContacts()
            );

    View rootView = inflater.inflate(R.layout.fragment_main, container, false);

    //Get reference  to the list view and then set the adapter to it.
    listView = (ListView) rootView.findViewById(R.id.listView_contacts);
    listView.setAdapter(adapter);

    return rootView;
}
/*
Method to get contacts from the Database
 */
public List<String> getContacts(){

    Cursor result = mydb.getData();
    List<String> nameList = new ArrayList<String>();

    if(result.getCount() == 0){
        nameList.add("No Contacts available");
        return nameList;
    }

    StringBuffer buffer = new StringBuffer();
    while(result.moveToNext()){
        //buffer.append("ID :" + result.getString(0)+"\n");
        buffer.append("Name :" + result.getString(1)+"\n");
        buffer.append("Phone :" + result.getString(2)+"\n");
        buffer.append("Email :" + result.getString(3)+"\n");
        buffer.append("B-Day :" + result.getString(4) + "\n");

    }
    nameList.add(buffer.toString());
    return nameList;
}

}

activity_main.xml中

<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:id="@+id/fragment"
android:name="com.example.jak.contacts.MainActivityFragment"
tools:layout="@layout/fragment_main" android:layout_width="match_parent"
android:layout_height="match_parent" />

fragment_main.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context=".MainActivityFragment"
android:orientation="vertical">

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Add Contact"
    android:id="@+id/button_Add_Contact"
    android:layout_gravity="center_horizontal|bottom" />

<ListView
    android:layout_width="match_parent"
    android:layout_height="410dp"
    android:id="@+id/listView_contacts"
    android:layout_gravity="right"
    />

contact_list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:minHeight="?android:attr/listPreferredItemHeight"
    android:gravity="center_vertical"
    android:id="@+id/contact_list_item_textView">