我能得到的最接近的是在取消选中每个checkbox后显示toast，但我想仅在它们全部未选中后显示toast。在我的onBindViewHolder中，我有：
((MatchingContact) viewHolder).check.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
// ((MatchingContact) viewHolder).check.setOnClickListener(new CompoundButton.OnClickListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked==false) {
Toast.makeText(context_type, "all unchecked!", Toast.LENGTH_SHORT).show();
}
}
});
这是我的活动，NewContact.java，代码(在下面的评论中请求后)：
public class NewContact extends AppCompatActivity {
//in this JSONArray, checkedContacts, we will be storing each checkedContact JSON Object
//Then we're going to post it to our NewContact.php file
JSONArray checkedContacts = new JSONArray();
Button phoneContacts;
CheckBox mcheckbox;
//thse are the fields in the xml
private EditText categoryname;
private EditText namename;
private EditText phonename;
private EditText addressname;
private EditText commentname;
int public_or_private;
// ArrayList called selectPhoneContacts that will contain SelectPhoneContact info
ArrayList<SelectPhoneContact> selectPhoneContacts;
ArrayList<String> allPhonesofContacts;
ArrayList<String> allNamesofContacts;
ArrayList<String> MatchingContactsAsArrayList;
String phoneNoofUserCheck;
public String phoneNumberofContact;
String phoneNameofContact;
//For the recycler view, containing the phone contacts
RecyclerView recyclerView;
PopulistoContactsAdapter adapter;
int check_counter = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_new_contact);
PopulistoContactsAdapter adapter = new PopulistoContactsAdapter(selectPhoneContacts, NewContact.this);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
//we are fetching details for the recyclerview - the name, numbers, matching contacts...
LoadContact loadContact = new LoadContact();
loadContact.execute();
//selectPhoneContacts is an empty array list that will hold our SelectPhoneContact info
selectPhoneContacts = new ArrayList<SelectPhoneContact>();
recyclerView = (RecyclerView) findViewById(R.id.rv);
//cast an EditText for each of the field ids in activity_new_contactact.xml
categoryname = (EditText) findViewById(R.id.textViewCategory);
namename = (EditText) findViewById(R.id.textViewName);
phonename = (EditText) findViewById(R.id.textViewPhone);
addressname = (EditText) findViewById(R.id.textViewAddress);
commentname = (EditText) findViewById(R.id.textViewComment);
phoneContacts = (Button) findViewById(R.id.btnPhoneContacts);
phoneContactsButton();
checkboxnull();
public_or_private = 1;
}
// Load data in background
class LoadContact extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected Void doInBackground(Void... voids) {
//code here to get allPhonesofContacts
allPhonesofContacts = gson.fromJson(json, type);
//code here to get allNamesofContacts
allNamesofContacts = gson.fromJson(jsonNames, type);
System.out.println("NewContact: allNamesofContacts :" + allNamesofContacts);
//code here to get MatchingContactsAsArrayList
MatchingContactsAsArrayList = gsonMatchingContactsAsArrayList.fromJson(jsonMatchingContactsAsArrayList, type1);
System.out.println("SelectPhoneContactAdapter MatchingContactsAsArrayList :" + MatchingContactsAsArrayList);
//for every value in the allPhonesofContacts array list, call it phoneNumberofContact
for (int i = 0; i < allPhonesofContacts.size(); i++) {
phoneNumberofContact = allPhonesofContacts.get(i);
phoneNameofContact = allNamesofContacts.get(i);
SelectPhoneContact selectContact = new SelectPhoneContact();
//if a phone number is in our array of matching contacts
if (MatchingContactsAsArrayList.contains(phoneNumberofContact))
{ //add the selectContacts to the selectPhoneContacts array
// insert the contact at the beginning of the listview
selectPhoneContacts.add(0, selectContact);
//In SelectContact class, so getItemViewType will know which layout to show
selectContact.setType_row("1");
} else {
// insert it at the end (default)
selectPhoneContacts.add(selectContact);
selectContact.setType_row("2");
}
selectContact.setName(phoneNameofContact);
selectContact.setPhone(phoneNumberofContact);
}
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
PopulistoContactsAdapter adapter = new PopulistoContactsAdapter(selectPhoneContacts, NewContact.this);
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager((new LinearLayoutManager(NewContact.this)));
adapter.notifyDataSetChanged();
}
}
@Override
protected void onResume() {
super.onResume();
}
//for the Public Contacts button
private void phoneContactsButton() {
phoneContacts.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
PopulistoContactsAdapter adapter = new PopulistoContactsAdapter(selectPhoneContacts, NewContact.this);
recyclerView.setAdapter(adapter);
// recyclerView.setLayoutManager((new LinearLayoutManager(NewContact.this)));
//loop through the matching contacts
int count = PopulistoContactsAdapter.theContactsList.size();
for (int i = 0; i < count; i++) {
//for contacts that are checked (they can only be matching contacts)...
//PopulistoContactsAdapter.theContactsList.get(i).isSelected=true;
PopulistoContactsAdapter.theContactsList.get(i).setSelected(true);
//we need to notify the recyclerview that changes may have been made
adapter.notifyDataSetChanged();
}
}
});
}
private void checkboxnull() {
//adapter.setOnClickListener(new PopulistoContactsAdapter.OnClickListener() {
PopulistoContactsAdapter adapter = new PopulistoContactsAdapter(selectPhoneContacts, NewContact.this);
adapter.SetOnCheckBoxClickListener(new PopulistoContactsAdapter.OnCheckBoxClickListener() {
@Override
public void onCheckBoxClick(boolean isChecked) {
if (isChecked)
++check_counter;
else
--check_counter;
if (check_counter <= 0)
Toast.makeText(NewContact.this, "all unchecked!", Toast.LENGTH_SHORT).show();
}
});
}
//create a method in your first activity, (where the button color should change):
public void changeColorInFirstActivity(){
// Button btnA = (Button) findViewById(R.id.btnPhoneContacts);
phoneContacts.setBackgroundColor(Color.RED);
}
}
和我的适配器：
public class PopulistoContactsAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder > {
private Context mContext;
//make a List containing info about SelectPhoneContact objects
public static List<SelectPhoneContact> theContactsList;
Context context_type;
private OnCheckBoxClickListener onCheckBoxClickListener;
public class MatchingContact extends RecyclerView.ViewHolder {
//In each recycler_blueprint show the items you want to have appearing
public TextView title, phone;
public CheckBox check;
public Button invite;
public MatchingContact(final View itemView) {
super(itemView);
//title is cast to the name id, in recycler_blueprint,
//phone is cast to the id called no etc
title = (TextView) itemView.findViewById(R.id.name);
phone = (TextView) itemView.findViewById(R.id.no);
invite = (Button) itemView.findViewById(R.id.btnInvite);
check = (CheckBox) itemView.findViewById(R.id.checkBoxContact);
}
}
public class nonMatchingContact extends RecyclerView.ViewHolder {
//In each recycler_blueprint show the items you want to have appearing
public TextView title, phone;
public CheckBox check;
public Button invite;
public nonMatchingContact(final View itemView) {
super(itemView);
//title is cast to the name id, in recycler_blueprint,
//phone is cast to the id called no etc
title = (TextView) itemView.findViewById(R.id.name);
phone = (TextView) itemView.findViewById(R.id.no);
invite = (Button) itemView.findViewById(R.id.btnInvite);
check = (CheckBox) itemView.findViewById(R.id.checkBoxContact);
}
}
@Override
public int getItemViewType(int position) {
//for each row in recyclerview, get the getType_row, set in NewContact.java
return Integer.parseInt(theContactsList.get(position).getType_row());
}
public PopulistoContactsAdapter(List<SelectPhoneContact> selectPhoneContacts, Context context) {
//selectPhoneContacts = new ArrayList<SelectPhoneContact>();
theContactsList = selectPhoneContacts;
this.mContext = context;
// whichactivity = activity;
context_type = context;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView;
//if getType_row is 1...
if (viewType == 1)
{
Context context = parent.getContext();
LayoutInflater inflater = LayoutInflater.from(context);
itemView = inflater.inflate(R.layout.recycler_blueprint, parent, false);
//itemView.setTag();
return new MatchingContact(itemView);
} else {
Context context = parent.getContext();
LayoutInflater inflater = LayoutInflater.from(context);
itemView = inflater.inflate(R.layout.recycler_blueprint_non_matching, parent, false);
return new nonMatchingContact(itemView);
}
}
@Override
public void onBindViewHolder(final RecyclerView.ViewHolder viewHolder, final int position) {
//bind the views into the ViewHolder
//selectPhoneContact is an instance of the SelectPhoneContact class.
//We will assign each row of the recyclerview to contain details of selectPhoneContact:
//The number of rows will match the number of phone contacts
final SelectPhoneContact selectPhoneContact = theContactsList.get(position);
//if the row is a matching contact
if (viewHolder.getItemViewType() == 1)
{
//in the title textbox in the row, put the corresponding name etc...
((MatchingContact) viewHolder).title.setText(selectPhoneContact.getName());
((MatchingContact) viewHolder).phone.setText(selectPhoneContact.getPhone());
((MatchingContact) viewHolder).check.setChecked(theContactsList.get(position).getSelected());
((MatchingContact) viewHolder).check.setTag(position);
((MatchingContact) viewHolder).check.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//pos is the row number that the clicked checkbox exists in
Integer pos = (Integer) ((MatchingContact) viewHolder).check.getTag();
//NEED THIS TO PRESERVE CHECKBOX STATE
//because it is onClick, getSelected will always be the same value
//false or true, it doesn't matter
if (theContactsList.get(pos).getSelected()) {
theContactsList.get(pos).setSelected(false);
Toast.makeText(context_type, theContactsList.get(pos).getPhone() + " clicked!", Toast.LENGTH_SHORT).show();
} else {
theContactsList.get(pos).setSelected(true);
Toast.makeText(context_type, theContactsList.get(pos).getPhone() + " unclicked!", Toast.LENGTH_SHORT).show();
}
}
});
((MatchingContact) viewHolder).check.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
// ((MatchingContact) viewHolder).check.setOnClickListener(new CompoundButton.OnClickListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
onCheckBoxClickListener.onCheckBoxClick(isChecked);
}
});
}
else {
((nonMatchingContact) viewHolder).title.setText(selectPhoneContact.getName());
((nonMatchingContact) viewHolder).phone.setText(selectPhoneContact.getPhone());
}
}
@Override
public int getItemCount() {
return theContactsList.size();
}
public interface OnCheckBoxClickListener {
void onCheckBoxClick(boolean ischecked);
}
public void SetOnCheckBoxClickListener(final OnCheckBoxClickListener onCheckBoxClickListener) {
this.onCheckBoxClickListener = onCheckBoxClickListener;
}
}
使用接口
在Adapter中定义此接口
private OnCheckBoxClickListener onCheckBoxClickListener;
public interface OnCheckBoxClickListener {
void onCheckBoxClick(boolean ischecked);
}
加
public void SetOnCheckBoxClickListener(final OnCheckBoxClickListener onCheckBoxClickListener) {
this.onCheckBoxClickListener = onCheckBoxClickListener;
}
更新onBindViewHolder
((MatchingContact) viewHolder).check.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
// ((MatchingContact) viewHolder).check.setOnClickListener(new CompoundButton.OnClickListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
onCheckBoxClickListener.onCheckBoxClick(isChecked);
}
});
在Activity/Fragment
int check_counter = 0;
mAdapter.SetOnCheckBoxClickListener(new YourAdapterClass.OnCheckBoxClickListener() {
@Override
public void onCheckBoxClick(boolean ischecked) {
if (ischecked)
++check_counter;
else
--check_counter;
if (check_counter <= 0)
Toast.makeText(context, "all unchecked!", Toast.LENGTH_SHORT).show();
}
});
您可以使用全局变量来存储所选复选框的计数，然后在每次检查更改事件时更新计数(根据选中的值添加或替换计数)，然后，如果更新后计数为 0，则取消选中所有复选框
像这样：
//if all the checkboxes are cheked by default
int count = theContactsList.size();
//if all the checkboxes are uncheked by defult
int count = 0;
和
((MatchingContact) viewHolder).check.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener()
{
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked)
{
if (!isChecked)
{
count--;
}
else
{
count++;
}
if(count<=0)
{
//all unchcked
}
}
});
我设法用onClickListener做到了.
在我的：
((MatchingContact) viewHolder).check.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
我把：
int count = 0;
int size = theContactsList.size();
for (int i = 0; i < size; i++) {
if (theContactsList.get(i).isSelected) {
count++;
}
}
if(count==0) {
Toast.makeText(context_type, "All unchecked!" , Toast.LENGTH_SHORT).show();
}