显示到listview android studio时无法分隔项目

我正在学习Android，到目前为止，我已经开始创建联系人列表。列表是使用SQLlight存储的，但是当我试图在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

联系人1

联系人2

联系人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;
}

而不是

联系人1

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;
}

联系人2

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;
}

联系人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;
}

public类MainActivityFragment扩展了片段{
数据库助手mydb；
阵列适配器；
私有静态ListView ListView；
公共维护活动片段（）{
}
@凌驾
创建视图上的公共视图（布局、充气机、视图组容器、，
Bundle savedInstanceState）{
mydb=新的DatabaseHelper（getActivity（））；
适配器=新阵列适配器(
//获取有关MainActivity/此片段的父活动的信息
getActivity（），
//联系人项目布局的Id
R.layout.contact\u list\u项目，
//获取联系人的arraylist
getContacts（）
);
视图根视图=充气机。充气（R.layout.fragment_main，容器，错误）；
//获取对列表视图的引用，然后将适配器设置为它。
listView=（listView）rootView.findViewById（R.id.listView\u联系人）；
setAdapter（适配器）；
返回rootView；
}
/*
方法从数据库中获取联系人
*/
公共列表getContacts（）{
游标结果=mydb.getData（）；
列表名称列表=新的ArrayList（）；
if（result.getCount（）==0）{
姓名列表。添加（“无联系人”）；
返回姓名列表；
}
StringBuffer=新的StringBuffer（）；
while（result.moveToNext（））{
//append（“ID:+result.getString（0）+”\n”）；
append（“名称：”+result.getString（1）+“\n”）；
buffer.append（“Phone:+result.getString（2）+”\n”）；
buffer.append（“电子邮件：+result.getString（3）+”\n”）；
buffer.append（“B-Day:+result.getString（4）+”\n”）；
}
nameList.add（buffer.toString（））；
返回姓名列表；
}

}

activity_main.xml

<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"
    />

联系\u list\u 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">

---

同一部分是什么意思？是视觉上的吗？同一部分？或者它们被添加到同一个列表项中？你怎么知道它们都在同一个位置？您使用的只是文本视图，您看到的可能是三个文本视图。如果单击每个联系人，会发生什么情况？您看到的是全部选中还是一次一个？当我尝试只点击1时，它们都被选中。在每个单独的接触之后，只有一条分隔线，而不是一条分隔线。谢谢你的回答，我解决了这个问题。我没有从数据库中正确检索信息。