Custom three item ListView adapter

Question

I have a ListView layout with three values per item (grade_list.xml), but I cannot get my adapter to set the third value because the HashMap will only take two Strings. How would I get around this?

grade_list.xml

<TwoLineListItem xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="?attr/listPreferredItemHeight"
android:mode="twoLine"
android:paddingStart="?android:attr/listPreferredItemPaddingStart"
android:paddingEnd="?android:attr/listPreferredItemPaddingEnd">
<!-- First Line - Header Text -->
<TextView
    android:id="@android:id/text1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignTop="@+id/thumbnail"
    android:layout_toRightOf="@+id/thumbnail"
    android:textColor="#040404"
    android:typeface="sans"
    android:textSize="15dip"
    android:layout_marginTop="8dp"
    android:textStyle="bold"/>
<!-- Second Line - Description -->
<TextView
    android:id="@android:id/text2"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_below="@android:id/text1"
    android:layout_alignStart="@android:id/text1"
    android:textColor="#343434"
    android:textSize="10dip"
    android:layout_marginTop="1dip"
    android:layout_toRightOf="@+id/thumbnail" />
<!-- Third Line - Grade -->
<TextView
    android:id="@+id/text3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentRight="true"
    android:layout_alignTop="@id/title"
    android:gravity="right"
    android:layout_marginTop="8dp"
    android:layout_marginRight="5dip"
    android:textSize="10dip"
    android:textColor="#10bcc9"
    android:textStyle="bold"/></TwoLineListItem>

My server responds with something along the lines of

Period 1 - Language Arts;Period 2 - Biology;Period 3 - Engineering~~DIVIDER~~A+;B-;A

in the format of

Class;Class;Class~~DIVIDER~~Grade;Grade;Grade

then the client puts that data into the ListView with this code

final String[] ServerResponse = input.split("~~DIVIDER~~");
final String[] Classes = ServerResponse[0].split(";");
final String[] Grades = ServerResponse[1].split(";");

ArrayList<HashMap<String, String>> item_list = new ArrayList<HashMap<String, String>>();

for (int i = 0; i < Classes.length; i++) {
    HashMap<String, String> item = new HashMap<String, String>();
    item.put("Class", Classes[i]);
    item.put("Grade", Grades[i]);

    item_list.add(item);
}

String[] list_input = new String[] { "Class", "Grade" };
// PUT THE STRING VALUES FROM list_input INTO THE XML LAYOUT VALUES
int[] layout_values = new int[] { android.R.id.text1, android.R.id.text2};

// LISTVIEW LAYOUT (XML FILE)
int list_layout = grade_list;

ListView gradeListView = (ListView) findViewById(R.id.gradeListView);
gradeListView.setAdapter(new SimpleAdapter(this, item_list, list_layout, list_input, layout_values));

I'd like to split the

Period 1 - Class Name 

Into two separate values, the period would populate the first line, and the class name would populate the second line, split by the - character. However, the HashMap will only hold two values, instead of my desired three.

The Android documentation does not give much help into this, nor does Google. Thanks in advance.

Answer 1

It is good to remember that the HashMap links the data to the line ID (two items). There is a HashMap created for each list line. The SimpleAdapter does the same iteration as your code for loading the ListView from each HashMap.

It'll be something like:

//Setting the HashMaps

HashMap<String,String> item;
for(int i=0;i<Classes.length;i++){
    item = new HashMap<String,String>();
    item.put( "text1", Period[i]);
    item.put( "text2", Classes[i]);
    item.put( "text3", Grades[i]);
    list.add( item );
}

//...

//Setting the adapter
gradeListView.setAdapter(new new SimpleAdapter(this, item_list, R.layout.TwoLineListItem, new String[] { "text1","text2", "text3" }, new int[] {R.id.text1, R.id.text, R.id.text3}));

Though you should really rename your TwoLineListItem to ThreeLineListItem to avoid future confusions.

Answer 2

You can make your custom object for a list item

public class ListItem {
    public String text1;
    public String text1;
    public String text1;

    public ListItem(String text1, String text2, String text3) {
        this.text1 = text1;
        this.text2 = text2;
        this.text3 = text3;
    }
}

Then use ArrayList<ListItem> and a custom adapter .