Question

我正在尝试从我的Android手机中读取联系人以修改它们并将它们写回数据库。到目前为止，该项目有三个班级：

MainActivity.java。这是我读取数据库的地方，填充我创建的联系人对象并将它们放在列表中。

public class MainActivity extends Activity {
private ArrayAdapter<String> adapter;

// Store contacts values in these arraylist.
// I t is not really needed for this implementation but I keep this just in case

public static ArrayList<String> phoneValueArr = new ArrayList<>();
public static ArrayList<String> nameValueArr = new ArrayList<>();

// Store the values of names and associated phone numbers.
public  ContactData contactsData= new ContactData(); 

// List to store the contacts
public  ContactsDataList contactsList= new ContactsDataList();

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

adapter = new ArrayAdapter<>
(this, android.R.layout.simple_dropdown_item_1line, new ArrayList<String>());
readContactsData();

//Display the number of contacts
Toast.makeText(getApplicationContext(),
        "read " + phoneValueArr.size() + " contacts. "  , Toast.LENGTH_LONG).show();


pressButton();

    for(ContactData c:contactsList.getContacts()){
        Toast.makeText(getApplicationContext(),
                c.getContact_name() + "Hopes   on God "  ,    Toast.LENGTH_LONG).show();

    }

}
}

public  void readContactsData() {

try {

    // Reading Contacts Name And Number

    String phoneNumber = "";
    ContentResolver cr = getBaseContext().getContentResolver();

    // Query to get contact name

    Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI, null,
            null, null, null);

    // If data data found in contacts
    if (cur.getCount() > 0) {

     Log.i("AutocompleteContacts", "Reading   contacts........");

     int k = 0;
     String name = "";

     //Until there are no more contacts stored
      while (cur.moveToNext()) {

      String id = cur.getString(cur
      .getColumnIndex(ContactsContract.Contacts._ID));
      name = cur
      .getString(cur.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));

            // Check contact have phone number
            if (Integer
                    .parseInt(cur.getString(cur
                            .getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER))) > 0) {

                // Create query to get phone number by contact id
                Cursor pCur = cr
                .query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
                null,
                ContactsContract.CommonDataKinds.Phone.CONTACT_ID
                + " = ?", new String[] { id },
                null);
                int j = 0;

                //Until query is stopped
                while (pCur.moveToNext()) {
                    // Sometimes get multiple data
                    if (j == 0) {
                        // Get Phone number
                        phoneNumber = ""
                                + pCur.getString(pCur
                                        .getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));

                        // Add contacts names to adapter
                        adapter.add(name);

                        // Add ArrayList names to adapter
                        phoneValueArr.add(phoneNumber.toString());
                        nameValueArr.add(name.toString());

                        // Set contact name and phone number
                        // i.e parse the SQLlite query to set the POJO's
                        contactsData.setPhone_number(phoneNumber.toString());
                        contactsData.setContact_name(name.toString());


                        // Add Contacts to list
                        contactsList.addContact(contactsData);


                      j++;
                        k++;
                    }

                } // End while loop

                pCur.close();
            } // End if

        }// End while loop

    } // End Cursor value check
    cur.close();

} catch (Exception e) {
    Log.i("AutocompleteContacts", "Exception : " + e);
}
}

ContactData类，我在其中创建实例化对象的类。

public class ContactData {

public String contact_name;
public String phone_number;

public ContactData(){

}

public  ContactData(String contact_name, String phone_number) {

this.contact_name=contact_name;
this.phone_number=phone_number;
}



public String getContact_name() {
return contact_name;
}

public void setContact_name(String contact_name) {
this.contact_name = contact_name;
}
public String getPhone_number() {
return phone_number;
}
public void setPhone_number(String phone_number) {
this.phone_number = phone_number;
}

 public String toString() {
    return contact_name + ", " + phone_number;
}


public boolean equals(Object obj) {
if (obj instanceof ContactData) {
    ContactData contact = (ContactData) obj;
    return (contact_name.equals(contact.getContact_name()) && phone_number
            .equals(contact.getPhone_number()));
}

return false;
}


public int hashCode() {
    return (contact_name.length() + phone_number.length());
}
 class ContactNameComparator implements Comparator<ContactData> {
    public int compare(ContactData contact1, ContactData contact2) {
        return   contact1.getContact_name().compareToIgnoreCase(contact2.getContact_name());
    }
 }
 }

ContactsDataList，它接收对象并存储它们。

 public class ContactsDataList  {



 public List<ContactData> contactList;

public ContactsDataList() {

this(new ArrayList<ContactData>());
}

public ContactsDataList(List<ContactData> contactList) {
this.contactList = contactList;
}

public void addContact(ContactData contact) {
if (contactList != null) {
        contactList.add(contact);
    }
}

public List<ContactData> getContacts() {
return contactList;
}

public void setContacts(List<ContactData> contacts) {
this.contactList = contacts;
}


}

我列表中的联系人对象都是一样的，我没看到出错的地方，因为arraylists phoneValuerArr和nameValueArr都有正确的数据。

ContactsDataList，contactList，仅包含最后一次阅读的联系人。

有人可以帮忙吗？

Answer 1

您在ContactData循环的每次迭代中重用while的相同实例，只是更新其属性。您需要为每次迭代创建一个单独的实例

while (pCur.moveToNext()) {
    ...
    ContactData contactsData = new ContactData();
    contactsData.setPhoneNumber(...);
    ...
}

ArrayList仅存储最后读取的值

1 个答案: