Get data from all rows in ListView with CustomViews

Question

Android 2.3.3, MinSDK = 8

I have a ListView, with CustomView (with an Image, two textviews and 1 checkbox) for each row. I have a button called Add Contacts. On click of this button, I have the check whether the checkbox is checked or not. If Checked, I have to get the values of the image, and two textviews and store in database.

I know how ListView's CustomView works. The views get created as and when they are displayed. So, how do I get all the rows that are checked?

Here is the XML layout :::

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="100dp"
    android:layout_margin="2dp"    
    android:orientation="horizontal" >

    <ImageView
        android:id="@+id/imgView_addcontact"
        android:layout_width="0dip"
        android:layout_height="100dp"
        android:layout_weight="0.20"
        android:padding="5dp"
        android:src="@drawable/addcontactsmall2" />

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="100dp"
        android:layout_gravity="center"
        android:layout_weight="0.60"
        android:orientation="vertical"
        android:padding="5dp" >

        <TextView
            android:id="@+id/txtView_addcontact_contactname"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Contact Name"
            android:textSize="20sp" />

        <TextView
            android:id="@+id/txtview_addcontact_phonenumber"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Phone Number"
            android:textSize="16sp" />
    </LinearLayout>

    <CheckBox
        android:id="@+id/chbk_addcontact"
        android:layout_width="0dp"
        android:layout_height="100dp"
        android:layout_weight="0.10"
        android:layout_gravity="center"
        android:padding="5dp" />

</LinearLayout>

Here is the code that i am trying - though I know, it doesn't work :::

for(int i = 0; i< lv_addcontacts.getCount(); i++)
            {
                View contactView = lv_addcontacts.getChildAt(i);

                CheckBox contactView_chbk = (CheckBox) contactView.findViewById(R.id.chbk_addcontact);
                TextView contactView_txt_contactname = (TextView) contactView.findViewById(R.id.txtView_addcontact_contactname);
                TextView contactView_txt_phonenumber = (TextView) contactView.findViewById(R.id.txtview_addcontact_phonenumber);

                if(contactView_chbk.isChecked())
                {   
                    System.out.println("Contact Name = " + contactView_txt_contactname.getText().toString());
                    System.out.println("Phone Number = " + contactView_txt_phonenumber.getText().toString());
                    System.out.println("CheckBox Status = Checked");
                    System.out.println("");
                }
                else
                {
                    System.out.println("Contact Name = " + contactView_txt_contactname.getText().toString());
                    System.out.println("Phone Number = " + contactView_txt_phonenumber.getText().toString());
                    System.out.println("CheckBox Status = Not Checked");
                    System.out.println("");
                }

            }

And the Exception I get :::

// OutPut

04-08 12:28:47.539: I/System.out(3244): Contact Name = Self Help
04-08 12:28:47.539: I/System.out(3244): Phone Number = *111#
04-08 12:28:47.539: I/System.out(3244): CheckBox Status = Not Checked
04-08 12:28:47.539: I/System.out(3244): Contact Name = Bonus Cards
04-08 12:28:47.539: I/System.out(3244): Phone Number = *444#
04-08 12:28:47.539: I/System.out(3244): CheckBox Status = Checked
04-08 12:28:47.539: I/System.out(3244): Contact Name = Annaya
04-08 12:28:47.539: I/System.out(3244): Phone Number = +1xxxx
04-08 12:28:47.539: I/System.out(3244): CheckBox Status = Not Checked

// Exception

04-08 12:28:47.539: W/dalvikvm(3244): threadid=1: thread exiting with uncaught exception (group=0x401be560)
04-08 12:28:47.539: E/AndroidRuntime(3244): FATAL EXCEPTION: main
04-08 12:28:47.539: E/AndroidRuntime(3244): java.lang.NullPointerException
04-08 12:28:47.539: E/AndroidRuntime(3244):     at com.xxx.xx.Class_Add_Contact.onClick(Class_Add_Contact.java:277)
04-08 12:28:47.539: E/AndroidRuntime(3244):     at android.view.View.performClick(View.java:2485)
04-08 12:28:47.539: E/AndroidRuntime(3244):     at android.view.View$PerformClick.run(View.java:9080)
04-08 12:28:47.539: E/AndroidRuntime(3244):     at android.os.Handler.handleCallback(Handler.java:587)
04-08 12:28:47.539: E/AndroidRuntime(3244):     at android.os.Handler.dispatchMessage(Handler.java:92)
04-08 12:28:47.539: E/AndroidRuntime(3244):     at android.os.Looper.loop(Looper.java:130)
04-08 12:28:47.539: E/AndroidRuntime(3244):     at android.app.ActivityThread.main(ActivityThread.java:3687)
04-08 12:28:47.539: E/AndroidRuntime(3244):     at java.lang.reflect.Method.invokeNative(Native Method)
04-08 12:28:47.539: E/AndroidRuntime(3244):     at java.lang.reflect.Method.invoke(Method.java:507)
04-08 12:28:47.539: E/AndroidRuntime(3244):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:878)
04-08 12:28:47.539: E/AndroidRuntime(3244):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:636)
04-08 12:28:47.539: E/AndroidRuntime(3244):     at dalvik.system.NativeStart.main(Native Method)

The exception is coming because, the views are not yet created. But, then, how do i get the checked values in the entire list.

EDIT :::

If i choose to implement onCheckedChange() for the checkbox, How do i get the ListView Item, of the current checked checkbox, inside the onCheckedChange() method?

@Override
        public void onCheckedChanged(CompoundButton buttonView,
                boolean isChecked) {
            // TODO Auto-generated method stub

            if(isChecked)
            {
                // How do I get the View(CustomView of ListView) to access the textViews and ImageView?
            }

        }

Answer 1

Make an inner class like this with the getter setters for your values which you want to store

class CommonCategory {

        private String nameofFriend;
        private boolean isChecked;

        public void setName(String nameofFriend) {
            this.nameofFriend = nameofFriend;
        }

        public String getName() {
            return nameofFriend;
        }

        public void setChecked(boolean isChecked) {
            this.isChecked = isChecked;
        }

        public boolean isChecked() {
            return isChecked;
        }
    }

Get your list like this which you want to show in the list view

  final ArrayList<CommonCategory> commonFriends = new ArrayList<CommonCategory>();


  for (FriendsDataClass friendsDataClass : XMPPConn.mfriendList) {
                String usernameEmail = friendsDataClass.friendName;
                String username = usernameEmail.substring(0,
                        usernameEmail.indexOf("@"));


                    CommonCategory commoncontacts = new CommonCategory();
                    commoncontacts.setUsernameEmail(usernameEmail);
                    commoncontacts.setName(username);
                    commoncontacts.setChecked(false);
                    commonFriends.add(commoncontacts);



        }       

And do set your checkbox value in onCompoundButton in the getView itself, and set is to the getter setter. This way you can do it very easily.

Thanks