Java/Android Change data in a ListView populated by a ArrayList of Objects

Question

I have an issue which I can't seem to solve. I have a ListView, this ListView contains an object (IndividualRow). this IndividualRow has 3 values which are displayed in textviews and in a switch. These IndividualRows are stored in an ArrayList, but then I got stuck.

I want to press on 1 of the TextViews (which is displaying a temperature), when I press it, it should automatically add 1.

Now the problem is that I don't know how to implement this. I tried several things but I cound't figure it out. I don't specifically want code, but I'd like to know what I should do, so I'll not copy past and don't learn from it. This is my code so far.

(I have a custom adapter so that the ListView displays my rows accordingly, i can include it here if you want)

list_item.xml (this is how a row looks like)

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:paddingTop="14dp"
android:paddingBottom="14dp" >

<Switch
    android:id="@+id/switch1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:height="30dp"
    android:textSize="22sp"
    android:textOff="@string/Off"
    android:textOn="@string/On"
    android:paddingLeft="30dp" />
<TextView 
    android:id="@+id/tijd"
    android:textSize="22sp"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_weight="1"        
    android:gravity="right"
    android:clickable="true"/>
<TextView
    android:id="@+id/temperatuur"
    android:textSize="22sp"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:gravity="right"
    android:clickable="true"/>
<TextView
    android:layout_width="wrap_content"
    android:textSize="22sp"
    android:layout_height="wrap_content"
    android:text="@string/GradenCelcius"
    android:paddingRight="10dp" />
</LinearLayout>

This is the IndividualRow code

//holds values for each individual row
  public  class IndividualRow {
//instance variables
private  String  tijd;
private  int  temperatuur;
private  boolean onoroff2;

//constructor > what an individual row needs to be an individual row
public IndividualRow(String data1,int data2, boolean onoroff){
tijd = data1;
temperatuur = data2;
onoroff2 = onoroff;
}

//sends value of tijd
public String getString1(){
    return tijd;
}

//sends value of temperatuur
public String getString2(){
    String x = Integer.toString(temperatuur);
    return x;
}

//sends value of switch state, so on or off (on = true, off = false)
public boolean getBoolean() {
    return onoroff2;
}

//probably should add setString1 and so on here right?
}

And than here is my fragment which should operate it all

public class SettingTimeFragment extends Fragment{

//Instance Variables
private List<IndividualRow> items = new ArrayList<IndividualRow>();
private CustomAdapter adapter;
private ListView rowListView;
private String tijd = "0:00";
private int temperatuur = 15; 
private boolean onoroff = true;

//creates the SettingTimeFragment
public static final SettingTimeFragment newInstance(){
    SettingTimeFragment f = new SettingTimeFragment();
    return f;
}

//providing it's layout
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment 
    return inflater.inflate(R.layout.setting_time_fragment, container, false);
}

//creates the content of SettingTimeFragment
@Override
  public void onActivityCreated(Bundle savedInstanceState) {
    setHasOptionsMenu(true);
    super.onActivityCreated(savedInstanceState);

    items.add(new IndividualRow(tijd, temperatuur, onoroff));// add initial row

    adapter = new CustomAdapter(getActivity().getApplicationContext(),R.layout.list_item, items); // create new CustomAdapter
    rowListView=(ListView)getActivity().findViewById(R.id.rowListView); // find rowListView
    rowListView.setAdapter(adapter); //attach adapter to rowListView
}


//creates menu on top of the screen
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater)
{
    inflater.inflate(R.menu.setting_time_fragment_menu, menu);
}

//finds each individual button in menu and handles click events
public boolean onOptionsItemSelected(MenuItem item) 
{
    switch (item.getItemId()) 
    {
        case R.id.additionbutton:                      
            addRow(new IndividualRow(tijd, temperatuur, onoroff));
            return true;           
        default:
            return super.onOptionsItemSelected(item);
    }
}

//adds a new IndividualRow
public void addRow(IndividualRow newRow) {
       items.add(newRow);
       adapter.notifyDataSetChanged(); //updates adapter that there is new information to display
    }
}

Jimmy · Accepted Answer · 2013-12-23 16:47:16Z

I am android newbie. But I will try what I would have done/did for almost similar situation. First of all , I am not aware of the listview that you are talking about in example. I can see you using textview, and I doubt if that is clickable by default. I have used android list view like this which can be updated on every click:

  <ListView
    android:id="@android:id/list"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="@string/item_list" />

This is how I created adapter:

  final ArrayAdapter<ContentData> adapter = new ArrayAdapter<ContentData>(this,   android.R.layout.simple_list_item_1, values);

and this is how I would update the listview ( longClick example, you can use OnClick) :

 lv.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
        @Override
        public boolean onItemLongClick(AdapterView<?> myAdapter, View myView, int position, long id) {
            //update your list and perform your actions                    
               //notify your adapter about the changes if required
            return true;
        }
    });

You will probably need to research on how to use values.get() in above method. Basically about what position and id represents in above method and what adapter and view can provide.

I hope it did not confuse you. The above sample is from actual code I implemented for learning purpose, so It may not be the best solution.

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