我有一个列表视图，其中包含所有用户的联系人及其相关的电话号码。我希望他们能够选择多个单元格/行，然后列表必须突出显示选择的联系人，以便用户不会丢失状态。
我有一个自定义适配器设置，如下所示。
public class ContactsListAdapter extends BaseAdapter {
private static final String TAG = "ContactsListAdapter";
/*********** Declare Used Variables *********/
private Activity activity;
private ArrayList data;
private static LayoutInflater inflater=null;
public Resources res;
ContactsModel tempValues=null;
int i=0;
public ContactsListAdapter(Activity a, ArrayList d, Resources resLocal) {
/********** Take passed values **********/
activity = a;
data=d;
res = resLocal;
/*********** Layout inflator to call external xml layout () ***********/
inflater = ( LayoutInflater )activity.
getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
if (data != null) {
if(data.size()<=0)
return 1;
return data.size();
} else
return 0;
}
@Override
public Object getItem(int position) {
if (data != null)
return position;
return null;
}
@Override
public long getItemId(int position) {
if (data != null)
return position;
return 0;
}
/********* Create a holder Class to contain inflated xml file elements *********/
public static class ViewHolder{
public RelativeLayout containerView;
public TextView fullname;
public TextView phone_number;
}
@Override
public View getView(final int position, View convertView, ViewGroup viewGroup) {
View vi = convertView;
final ContactsListAdapter.ViewHolder holder;
if(convertView==null){
/****** Inflate tabitem.xml file for each row ( Defined below ) *******/
vi = inflater.inflate(R.layout.contacts_list_item, null);
/****** View Holder Object to contain tabitem.xml file elements ******/
holder = new ContactsListAdapter.ViewHolder();
holder.fullname = vi.findViewById(R.id.contactName);
holder.phone_number = vi.findViewById(R.id.contactPhoneNumber);
holder.containerView = vi.findViewById(R.id.containerView);
/************ Set holder with LayoutInflater ************/
vi.setTag( holder );
}
else
holder=(ContactsListAdapter.ViewHolder)vi.getTag();
if(data.size()<=0)
{
//holder.username.setText("No Data");
}
else
{
/***** Get each Model object from Arraylist ********/
tempValues=null;
tempValues = ( ContactsModel ) data.get( position );
holder.fullname.setText(tempValues.getFullname());
holder.phone_number.setText(tempValues.getPhone_number());
}
return vi;
}
}
然后我有一个异步任务，从设备获取联系人，然后更新适配器，如下所示。
class Contacts(context: Context, listview : ListView, adapter : ContactsListAdapter?, CustomListViewValuesArr : ArrayList<ContactsModel>, progress : ProgressBar?) : AsyncTask<Unit, Unit, Unit>() {
val context : Context = context
var listview : ListView = listview
var adapter : ContactsListAdapter? = adapter
var CustomListViewValuesArr : ArrayList<ContactsModel> = CustomListViewValuesArr
var holder : ArrayList<ContactsModel>? = null
var progress : ProgressBar? = progress
override fun onPreExecute() {
super.onPreExecute()
progress!!.visibility = View.VISIBLE
progress!!.animate()
}
override fun doInBackground(vararg params: Unit?) {
var obj : JSONObject = JSONObject()
var contactsModels : ArrayList<ContactsModel> = arrayListOf()
var cr : ContentResolver = context.contentResolver
var cur : Cursor = cr.query(ContactsContract.Contacts.CONTENT_URI,
null, null, null, null)
if ((if(cur != null) cur.getCount() else 0) > 0) {
while (cur != null && cur.moveToNext()) {
val id = cur.getString(
cur.getColumnIndex(ContactsContract.Contacts._ID))
val name = cur.getString(cur.getColumnIndex(
ContactsContract.Contacts.DISPLAY_NAME))
if (cur.getInt(cur.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER)) > 0) {
val pCur = cr.query(
ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,
ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = ?",
arrayOf(id), null)
while (pCur.moveToNext()) {
var phoneNo : String = pCur.getString(pCur.getColumnIndex(
ContactsContract.CommonDataKinds.Phone.NUMBER)).replace("\\D", "")
obj.put(name, phoneNo)
var model : ContactsModel = ContactsModel()
model.fullname = name
model.phone_number = phoneNo
contactsModels.add(model)
}
pCur.close()
}
}
holder = contactsModels
}
}
override fun onPostExecute(result: Unit?) {
super.onPostExecute(result)
CustomListViewValuesArr.clear()
CustomListViewValuesArr.addAll(holder!!)
//Log.d(TAG, "Adapter Notify")
adapter!!.notifyDataSetChanged()
progress!!.visibility = View.GONE
}
}
到目前为止，这是我选择联系人的最佳解决方案，但问题是滚动时无法为其他联系人设置背景。
contactsListView!!.setOnItemClickListener(object : AdapterView.OnItemClickListener {
override fun onItemClick(parent: AdapterView<*>?, view: View?, position: Int, id: Long) {
val items = contactsListView!!.getCheckedItemPositions()
for (i in 0 until contactsListView!!.getAdapter().getCount()) {
if (items.get(i) == true) {
parent!!.getChildAt(i).setBackgroundColor(getResources().getColor(R.color.hapningGrey))
val contactName = parent.getChildAt(i).findViewById<TextView>(R.id.contactName)
val phoneNumber = parent.getChildAt(i).findViewById<TextView>(R.id.contactPhoneNumber)
var itemPhoneNumber : String = phoneNumber.text.toString()
.replace("(", "")
.replace(")", "")
.replace(" ", "")
.replace("-", "")
if (nominatedList.contains(itemPhoneNumber) == false) {
nominatedList.add(itemPhoneNumber)
}
} else {
parent!!.getChildAt(i).setBackgroundColor(Color.TRANSPARENT)
val contactName = parent.getChildAt(i).findViewById<TextView>(R.id.contactName)
val phoneNumber = parent.getChildAt(i).findViewById<TextView>(R.id.contactPhoneNumber)
var itemPhoneNumber : String = phoneNumber.text.toString()
.replace("(", "")
.replace(")", "")
.replace(" ", "")
.replace("-", "")
if (nominatedList.contains(itemPhoneNumber) == true) {
nominatedList.remove(itemPhoneNumber)
}
}
}
Log.d(TAG, nominatedList.toString())
}
})
此时我们将不胜感激。
答案 0 :(得分：0)
添加到longClickListener
view.selected=true
将一个isSelected字段添加到持有者为boolean
var isSelected=false
添加到适配器
holder.isSelected=vi.isSelected
if (holder.isSelected)
vi.background=ContextCompat.getColor(vi.context,R.color.blue)