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我使用列表視圖與複選框獲取手機聯繫人。我使用了這個link給出的指導。如果我想選擇一些聯繫人，代碼工作正常。現在我想在活動爲複選框選擇列表視圖的所有選項
// Logcat
FATAL EXCEPTION: main
Process: com.sam.afrikk, PID: 10628
java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
at java.util.ArrayList.get(ArrayList.java:308)
at com.sam.afrikk.ContactsPickerActivity$1.onCheckedChanged(ContactsPickerActivity.java:54)
at android.widget.CompoundButton.setChecked(CompoundButton.java:156)
at android.widget.CompoundButton.toggle(CompoundButton.java:115)
at android.widget.CompoundButton.performClick(CompoundButton.java:120)
at android.view.View$PerformClick.run(View.java:21534)
at android.os.Handler.handleCallback(Handler.java:815)
at android.os.Handler.dispatchMessage(Handler.java:104)
at android.os.Looper.loop(Looper.java:207)添加一個「全選」複選框，但我發現IndexOutOfBoundsException異常。
public class ContactsList{
public ArrayList<Contact> contactArrayList;
ContactsList(){
contactArrayList = new ArrayList<Contact>();
}
public int getCount(){
return contactArrayList.size();
}
public void addContact(Contact contact){
contactArrayList.add(contact);
}
public void removeContact(Contact contact){
contactArrayList.remove(contact);
}
public Contact getContact(int id){
for(int i=0;i<this.getCount();i++){
if(Integer.parseInt(contactArrayList.get(i).id)==id)
return contactArrayList.get(i);
}
return null;
}
}public class ContactsListAdapter extends BaseAdapter {
Context context;
ContactsList contactsList,filteredContactsList,selectedContactsList;
String filterContactName;
ContactsListAdapter(Context context, ContactsList contactsList){
super();
this.context = context;
this.contactsList = contactsList;
this.filteredContactsList=new ContactsList();
this.selectedContactsList = new ContactsList();
this.filterContactName = "";
}
public void filter(String filterContactName){
filteredContactsList.contactArrayList.clear();
if(filterContactName.isEmpty() || filterContactName.length()<1){
filteredContactsList.contactArrayList.addAll(contactsList.contactArrayList);
this.filterContactName = "";
}
else {
this.filterContactName = filterContactName.toLowerCase().trim();
for (int i = 0; i < contactsList.contactArrayList.size(); i++) {
if (contactsList.contactArrayList.get(i).name.toLowerCase().contains(filterContactName))
filteredContactsList.addContact(contactsList.contactArrayList.get(i));
}
}
notifyDataSetChanged();
}
public void addContacts(ArrayList<Contact> contacts){
this.contactsList.contactArrayList.addAll(contacts);
this.filter(this.filterContactName);
}
@Override
public int getCount() {
return filteredContactsList.getCount();
}
@Override
public Contact getItem(int position) {
return filteredContactsList.contactArrayList.get(position);
}
@Override
public long getItemId(int position) {
return Long.parseLong(this.getItem(position).id);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder;
if(convertView==null){
LayoutInflater inflater = ((Activity)context).getLayoutInflater();
convertView = inflater.inflate(R.layout.contact_item, parent, false);
viewHolder = new ViewHolder();
viewHolder.chkContact = (CheckBox) convertView.findViewById(R.id.chk_contact);
convertView.setTag(viewHolder);
}else {
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.chkContact.setText(this.filteredContactsList.contactArrayList.get(position).toString());
viewHolder.chkContact.setId(Integer.parseInt(this.filteredContactsList.contactArrayList.get(position).id));
viewHolder.chkContact.setChecked(alreadySelected(filteredContactsList.contactArrayList.get(position)));
viewHolder.chkContact.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
Contact contact = filteredContactsList.getContact(buttonView.getId());
if(contact!=null && isChecked && !alreadySelected(contact)){
selectedContactsList.addContact(contact);
}
else if(contact!=null && !isChecked){
selectedContactsList.removeContact(contact);
}
}
});
return convertView;
}
public boolean alreadySelected(Contact contact)
{
if(this.selectedContactsList.getContact(Integer.parseInt(contact.id))!=null)
return true;
return false;
}
public static class ViewHolder{
CheckBox chkContact;
}
}public class ContactsPickerActivity extends AppCompatActivity {
ListView contactsChooser;
Button btnDone;
TextView txtLoadInfo;
ContactsListAdapter contactsListAdapter;
ContactsLoader contactsLoader;
CheckBox selectAll;
Contact contact;
ContactsList contactsList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_contacts_picker);
contactsChooser = (ListView) findViewById(R.id.lst_contacts_chooser);
btnDone = (Button) findViewById(R.id.btn_done);
txtLoadInfo = (TextView) findViewById(R.id.txt_load_progress);
selectAll = (CheckBox)findViewById(R.id.selectAll);
contactsListAdapter = new ContactsListAdapter(this,new ContactsList());
contactsChooser.setAdapter(contactsListAdapter);
loadContacts("");
selectAll.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
contactsList = new ContactsList();
if(isChecked){
selectAll.setText("Unselect All");
\t \t \t \t \t //HERE I"M GETTING EXCEPTION
for (int i=0;i<contactsListAdapter.getCount();i++){
contact = contactsListAdapter.selectedContactsList.contactArrayList.get(i);
contactsListAdapter.selectedContactsList.addContact(contact);
}
}else{
selectAll.setText("Select All");
for (int i=0;i<contactsListAdapter.getCount();i++){
contact = contactsListAdapter.selectedContactsList.contactArrayList.get(i);
contactsListAdapter.selectedContactsList.removeContact(contact);
}
}
}
});
btnDone.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(contactsListAdapter.selectedContactsList.contactArrayList.isEmpty()){
setResult(RESULT_CANCELED);
}
else{
Intent resultIntent = new Intent();
resultIntent.putParcelableArrayListExtra("SelectedContacts", contactsListAdapter.selectedContactsList.contactArrayList);
setResult(RESULT_OK,resultIntent);
}
finish();
}
});
}
private void loadContacts(String filter){
if(contactsLoader!=null && contactsLoader.getStatus()!= AsyncTask.Status.FINISHED){
try{
contactsLoader.cancel(true);
}catch (Exception e){
}
}
if(filter==null) filter="";
try{
//Running AsyncLoader with adapter and filter
contactsLoader = new ContactsLoader(this,contactsListAdapter);
contactsLoader.txtProgress = txtLoadInfo;
contactsLoader.execute(filter);
}catch(Exception e){
e.printStackTrace();
}
}
}