我正在尝试在我的应用程序中创建一个设备联系人列表，我必须在其中提供一个全选复选框。检查时它应该选择所有联系人并为所有联系人创建一个字符串缓冲区，以便我可以使用它向所有选定的联系人发送邮件。
到目前为止，我可以选择一个复选框，但无法创建全选菜单。我附上了我正在使用的代码。
public class CheckboxListField extends VerticalFieldManager implements ListFieldCallback, FieldChangeListener {
private static String [] selectedContacts = new String[]{};
private ChecklistData[] mListData = new ChecklistData[] {};
private ListField mListField;
private Vector mContacts;
private SendEmail sendEmail;
private int i;
public static StringBuffer emailString = new StringBuffer();
private MenuItem mMenuItemToggle = new MenuItem(
"Change Option", 0, 0) {
public void run() {
toggleItem();
};
};
private MenuItem mMenuItemGet = new MenuItem("Get", 0,
0) {
public void run() {
StringBuffer sbi = new StringBuffer();
for (int i = 0; i < mListData.length; i++) {
ChecklistData checkboxField = mListData[i];
if (checkboxField.isChecked()) {
sbi.append(checkboxField.getStringVal()).append(checkboxField.getContactNumber())
.append("\n");
}
}
}
};
private ButtonField _inviteButton;
// A class to hold the Strings in the CheckBox and it's checkbox state
// (checked or unchecked).
private class ChecklistData {
private String _stringVal;
private boolean _checked;
private String _telNumber;
ChecklistData(String stringVal,String telNumber , boolean checked) {
_stringVal = stringVal;
_checked = checked;
_telNumber = telNumber;
}
// Get/set methods.
private String getStringVal() {
return _stringVal;
}
private boolean isChecked() {
return _checked;
}
//Contact Info
private String getContactNumber() {
return _stringVal;
}
// Toggle the checked status.
public boolean toggleChecked() {
_checked = !_checked;
return _checked;
}
}
public CheckboxListField() {
//INVITE BUTTON
_inviteButton=new ButtonField("Invite Friend");
_inviteButton.setChangeListener(this);
_inviteButton.setMargin(2,0,10,0);
// toggle list field item on navigation click
mListField = new ListField() {
protected boolean navigationClick(int status,
int time) {
toggleItem();
return true;
};
};
// set two line row height
mListField.setRowHeight(getFont().getHeight() * 2);
mListField.setCallback(this);
add(new NullField(NullField.FOCUSABLE));
add(_inviteButton);
add(mListField);
// load contacts in separate thread
loadContacts.run();
}
protected Runnable loadContacts = new Runnable() {
public void run() {
reloadContactList();
// fill list field control in UI event thread
UiApplication.getUiApplication().invokeLater(
fillList);
}
};
protected Runnable fillList = new Runnable() {
public void run() {
int size = mContacts.size();
mListData = new ChecklistData[size];
for (int i = 0; i < mContacts.size(); i++) {
BlackBerryContact item = (BlackBerryContact) mContacts
.elementAt(i);
String displayName = getDisplayName(item);
String telContact = getContact(item);
mListData[i] = new ChecklistData(
displayName,telContact , false);
}
mListField.setSize(size);
}
};
protected void toggleItem() {
// Get the index of the selected row.
int index = mListField.getSelectedIndex();
if (index != -1) {
// Get the ChecklistData for this row.
ChecklistData data = mListData[index];
// Toggle its status.
data.toggleChecked();
// Invalidate the modified row of the ListField.
mListField.invalidate(index);
BlackBerryContact contact = (BlackBerryContact) mContacts
.elementAt(mListField
.getSelectedIndex());
String email= contact.getString(Contact.EMAIL, 0);
emailString = emailString.append(email+",");
}
}
protected void makeMenu(Menu menu, int instance) {
menu.add(mMenuItemToggle);
menu.add(mMenuItemGet);
super.makeMenu(menu, instance);
}
private boolean reloadContactList() {
try {
ContactList contactList = (ContactList) PIM
.getInstance()
.openPIMList(PIM.CONTACT_LIST,
PIM.READ_ONLY);
Enumeration allContacts = contactList.items();
mContacts = enumToVector(allContacts);
mListField.setSize(mContacts.size());
return true;
} catch (PIMException e) {
return false;
}
}
// Convert the list of contacts from an Enumeration to a Vector
private Vector enumToVector(Enumeration contactEnum) {
Vector v = new Vector();
if (contactEnum == null)
return v;
while (contactEnum.hasMoreElements()) {
v.addElement(contactEnum.nextElement());
}
return v;
}
public void drawListRow(ListField list,
Graphics graphics, int index, int y, int w) {
Object obj = this.get(list, index);
if (list.getSelectedIndex() != index) {
graphics.setBackgroundColor(index % 2 == 0 ? Color.WHITE
: Color.LIGHTGRAY);
graphics.clear();
//list.setFocus();
}
if (obj != null) {
ChecklistData currentRow = (ChecklistData) obj;
StringBuffer rowString = new StringBuffer();
if (currentRow.isChecked()) {
rowString
.append(Characters.BALLOT_BOX_WITH_CHECK);
} else {
rowString.append(Characters.BALLOT_BOX);
}
// Append a couple spaces and the row's text.
rowString.append(Characters.SPACE);
rowString.append(Characters.SPACE);
rowString.append(currentRow.getStringVal());
// Draw the text.
graphics.drawText(rowString.toString(), 0, y,
0, w);
} else {
graphics.drawText("No rows available.", 0, y,
0, w);
}
}
public static String getDisplayName(Contact contact) {
if (contact == null) {
return null;
}
String displayName = null;
// First, see if there is a meaningful name set for the contact.
if (contact.countValues(Contact.NAME) > 0) {
final String[] name = contact.getStringArray(
Contact.NAME, 0);
final String firstName = name[Contact.NAME_GIVEN];
final String lastName = name[Contact.NAME_FAMILY];
if (firstName != null && lastName != null) {
displayName = firstName + " " + lastName;
} else if (firstName != null) {
displayName = firstName;
} else if (lastName != null) {
displayName = lastName;
}
if (displayName != null) {
final String namePrefix = name[Contact.NAME_PREFIX];
if (namePrefix != null) {
displayName = namePrefix + " "
+ displayName;
}
return displayName;
}
}
return displayName;
}
// Returns the object at the specified index.
public Object get(ListField list, int index) {
Object result = null;
if (mListData.length > index) {
result = mListData[index];
}
return result;
}
// Returns the first occurrence of the given String,
// beginning the search at index, and testing for
// equality using the equals method.
public int indexOfList(ListField list, String p, int s) {
return -1;
}
// Returns the screen width so the list uses the entire screen width.
public int getPreferredWidth(ListField list) {
return Graphics.getScreenWidth();
// return Display.getWidth();
}
//GET EMAIL IDS FROM CONTACT
public static String getContact(Contact contact){
if (contact == null) {
return null;
}
String telNumber=null;
telNumber = contact.getString(Contact.TEL, 0);
telNumber = "[ "+telNumber+" ]";
System.out.println(telNumber);
return telNumber;
}
public void fieldChanged(Field field, int context) {
ChecklistData checklistData = new ChecklistData("","", false);
if(field==_inviteButton){
if(!checklistData.toggleChecked()){
UiApplication.getApplication();
synchronized (Application.getEventLock()){
UiApplication.getUiApplication().pushScreen(new InviteFriendEmailScreen());
}
}else{
//emailId = contact.getString(Contact.EMAIL, 0);
String mailBody =": "+Jxa.loginUserName+" invited you on NaijaPings app. Please download NaijaPings Android app from here "+"http://appworld.blackberry.com/webstore/content/77264/?lang=en" ;
sendEmail=new SendEmail(mailBody);
sendEmail.Email(emailString.toString(),Constant.emailSubject);
emailString=null;
}
}
}
}
请建议我并帮助我创建这个特殊的。
在这里，在Invite Button下方和创建列表之前，我需要带有文本Select All的复选框。
