如何从listview android的主列表中获取所选项目的文本

Posted 2023-04-19

【中文标题】如何从listview android的主列表中获取所选项目的文本

【英文标题】：How to get text of selected item from the main list in listview android

【发布时间】：2016-01-31 14:37:39

【问题描述】：

在这种情况下，当我长按列表上下文菜单中的任何名称时，它会再次弹出并要求选择其中一个选项。

我想要的是生成在主列表视图中选择的名称的祝酒词。附上图片以便更好地理解。例如，当我按下 David Hicks 博士时，应该会出现他的名字。

Image1 Image2 有人可以帮我解决这个问题吗

package com.example.tamukcompscfaculty;
import android.app.ListActivity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.MenuInflater;
import android.view.View;
import android.widget.ArrayAdapter;


public class MainActivity extends ListActivity 

    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        String[] Professors = getResources().getStringArray(R.array.Professors);
        ArrayAdapter<String> ProgAdapter =  new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, Professors);
        setListAdapter(ProgAdapter);
        registerForContextMenu(getListView());

    


    @Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) 
        if(v==getListView())

            MenuInflater menuInflater=getMenuInflater();
            menu.setHeaderTitle(R.string.More);
            menuInflater.inflate(R.menu.details, menu);

        

        super.onCreateContextMenu(menu, v, menuInfo);

    

Xml 文件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_
    android:layout_
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.tamukcompscfaculty.MainActivity" >

    <TextView
        android:id="@+id/textView1"
        android:layout_
        android:layout_
        android:layout_alignLeft="@+id/profs"
        android:layout_alignParentTop="true"
        android:layout_marginTop="33dp"
        android:text="@string/FacultyText"
        android:textColor="#000000"
        android:textSize="20sp"
        android:textStyle="bold|italic" />

    <ListView
        android:id="@android:id/list"
        android:layout_
        android:layout_
        android:layout_below="@+id/textView1"
        android:layout_centerHorizontal="true"
        android:layout_marginLeft="-25dp" >

    </ListView>

    <ImageView
        android:id="@+id/imageView1"
        android:layout_
        android:layout_
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_alignRight="@+id/textView1"
        android:scaleType="fitXY"
        android:src="@drawable/engineering" />

</RelativeLayout>

item_data.xml 是 Values 文件夹中的一个文件

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name = "Professors">

        <item >Dr. David Hicks</item>
        <item >Dr. Mohammad S. Khan</item>
        <item >Dr. Young Lee</item>
        <item >Dr. Mais Nijim</item>
        <item >Dr. Ashraf Yaseen</item>
        <item >Ms. Jeong Yang</item>
        <item >Dr. Abdelrahman Elleithy</item>
        <item >Dr. Wei-Da Hao</item>
        <item >Dr. Syed Iqbal Omar</item>
        <item >Dr. Muhammad Aurangzeb</item>
        <item >Dr. Gahangir Hossain</item>


    </string-array>    

</resources>

字符串.Xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">TamukCompScFaculty</string>
    <string name="action_settings">Settings</string>
    <string name="FacultyText"><u>Faculty Office Hours Details</u></string>
    <string name="Office_Hours">Check Office Hours</string>
    <string name="Email">Email Id</string>
    <string name="Phonenumber">Phone Number</string>
    <string name="More"><u>Click below to check the details</u></string>
    <string name="title_activity_start">StartActivity</string>
    <string name="hello_world">Hello world!</string>

</resources>

【问题讨论】：

"附上图片便于理解"在哪里？

【参考方案1】：

首先，创建您的Professors 成员变量，然后覆盖onListItemClick(ListView l, View v, int position, long id)，您可以在其中获取单击列表项的位置。所以你的代码将是：

public class MainActivity extends ListActivity 

private String[] Professors;

    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Professors = getResources().getStringArray(R.array.Professors);
        ArrayAdapter<String> ProgAdapter =  new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, Professors);
        setListAdapter(ProgAdapter);
        registerForContextMenu(getListView());

    


    @Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) 
        if(v==getListView())

            MenuInflater menuInflater=getMenuInflater();
            menu.setHeaderTitle(R.string.More);
            menuInflater.inflate(R.menu.details, menu);

           //get the position of row clicked
           AdapterContextMenuInfo info = (AdapterContextMenuInfo) menuInfo;
           int position = info.position;

           Toast.makeText(MainActivity.this, Professors[position], Toast.LENGTH_SHORT).show();

        

        super.onCreateContextMenu(menu, v, menuInfo);

    

【讨论】：

@Ajay 在 onCreated 方法中添加这一行：getListView().setOnItemClickListener(this);我会更新我的答案。

@Ajay 查看更新后的答案。这应该适合你。

@Ajay 如果有帮助，请随时接受我的回答。 :)

【参考方案2】：

你应该实现 OnItemClickListener 然后重写方法 onItemClick 并且不要忘记在你的 OnCreated 方法中注册监听器。

public class MainActivity extends ListActivity implements OnItemClickListener 

private String[] Professors;

@Override
protected void onCreate(Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Professors = getResources().getStringArray(R.array.Professors);
    ArrayAdapter<String> ProgAdapter =  new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, Professors);
    setListAdapter(ProgAdapter);
    getListView().setOnItemClickListener(this)
    registerForContextMenu(getListView());




@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) 
    if(v==getListView())

        MenuInflater menuInflater=getMenuInflater();
        menu.setHeaderTitle(R.string.More);
        menuInflater.inflate(R.menu.details, menu);

    

    super.onCreateContextMenu(menu, v, menuInfo);



@Override
protected void onListItemClick(ListView l, View v, int position, long id) 
    super.onListItemClick(l, v, position, id);

    Toast.makeText(MainActivity.this, Professors[position], Toast.LENGTH_SHORT).show();

【参考方案3】：

试试这个：

@Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        String[] Professors = getResources().getStringArray(R.array.Professors);
        ArrayAdapter<String> ProgAdapter =  new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, Professors);
        setListAdapter(ProgAdapter);
        registerForContextMenu(getListView());

        getListView.setOnItemClickListener(new AdapterView.OnItemClickListener() 
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) 
                Toast.makeText(MainActivity.this, Professors[position], Toast.LENGTH_SHORT).show();
            
        );