如何记录对象的键和值

Question

在我的 Android 应用程序中，我有一个包含用户联系人列表的姓名和电话号码的类。我还有一个列出联系人姓名的微调器。当用户从微调器中选择姓名时，我想Log 联系人的姓名和号码。

这里是MainActivity.java

package com.example.mycompy.myapp;

import android.content.ContentResolver;
import android.database.Cursor;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.provider.ContactsContract;

import java.util.ArrayList;


public class MainActivity extends ActionBarActivity implements AdapterView.OnItemSelectedListener {
    // this class will hold contact names and numbers
    public class ContactInfo {
        public String contactName, phoneNumber;

        public ContactInfo(String contactName, String phoneNumber){
            this.contactName = contactName;
            this.phoneNumber = phoneNumber;
        }

        @Override
        public String toString(){
            return contactName;
        }
    }

    public Spinner contactSpinner;


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

        ArrayList<ContactInfo> contactList = new ArrayList<ContactInfo>();
        ContentResolver cr = getContentResolver();
        Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI,null,null,null,null); // A SQL query for contacts data table, in Java form, I think...
        contactSpinner = (Spinner) findViewById(R.id.contact_list);
        contactSpinner.setOnItemSelectedListener(this);

        // If there are contacts, this code goes
        if(cur.getCount()>0){
            while(cur.moveToNext()){
                String id = cur.getString(
                        cur.getColumnIndex(ContactsContract.Contacts._ID)
                );
                String name = cur.getString(
                        cur.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME)
                );

                if(
                    Integer.parseInt(
                            cur.getString(
                                cur.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER)
                            )
                    ) > 0
                ){
                    Cursor pCur = cr.query(
                            ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
                            null,
                            ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = ?",
                            new String[]{id},null
                    );
                    while(pCur.moveToNext()){
                        String phone = pCur.getString(
                                pCur.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER)
                        );

                        // Add contact's info to `contactList`
                        ContactInfo newContact = new ContactInfo(name,phone);
                        contactList.add(newContact);
                        Log.v("onCreate", String.valueOf(newContact));
                    }
                    pCur.close();
                }
            }
        }

        // Add items to spinner
        ArrayAdapter adapter = new ArrayAdapter(this,android.R.layout.simple_spinner_dropdown_item,contactList);
        contactSpinner.setAdapter(adapter); // Spinner shows contact names only, which is what I want spinner to show
    }

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
        parent.getItemAtPosition(pos);
        Log.v("onItemSelected", String.valueOf(parent.getItemAtPosition(pos))); // When user selects a contact, this Logs just the contact name, but I want contact name AND number
    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) {
        // Another interface callback
    }

    // Rest of code...
}

如何编辑onItemSelected() 以便Logs 选择联系人姓名和电话号码？

Answer 1

当 String.valueOf(Object) 方法从给定对象调用 toString 方法时，您可以对其进行编程以准确打印您想要的内容。

试试这样的

public class ContactInfo {
    public String contactName, phoneNumber;

    public ContactInfo(String contactName, String phoneNumber){
        this.contactName = contactName;
        this.phoneNumber = phoneNumber;
    }

    @Override
    public String toString(){
        return contactName + " - " + phoneNumber;
    }
}