ListView: How to add data on custom ArrayAdapter?

Question

To have a colorful ListView I have created my own ArrayAdapter, but when I want to use adapter.clear() or adapter.add() it gives me errors. Here is the code and errors.

XML file:

<ListView
    android:id="@+id/android:list"
    android:layout_width="0dip"
    android:layout_height="wrap_content"
    android:padding="10dip"
    android:layout_margin="4dip"
    android:layout_weight="1">
</ListView>

Adapter:

class stableArrayAdapter extends ArrayAdapter<String> {

    HashMap<String, Integer> mIdMap = new HashMap<String, Integer>();

    public stableArrayAdapter(Context context, int textViewResourceId, String [] objects) 
    {
        super(context, textViewResourceId, objects);
        for (int i = 0; i < objects.length; ++i) {
            mIdMap.put(objects[i], i);
        }
    }

    @Override
    public long getItemId(int position) {
        String item = getItem(position);
        return mIdMap.get(item);
    }

    @Override
    public boolean hasStableIds() {
        return true;
    }
}

Java code:

public class createtarget extends ListActivity
{
    stableArrayAdapter adapter;

    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.createtarget);


        lstView = getListView();
        lstView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);        
        lstView.setTextFilterEnabled(true);

        Target=new String []{""};
        adapter = new stableArrayAdapter(this,android.R.layout.simple_list_item_checked, Target);
        setListAdapter(adapter);
    }   
}

Add code:

public void submit(View view) 
{

    adapter.add("Hello");
    }

Errors:

06-08 05:21:11.785: E/AndroidRuntime(3584): FATAL EXCEPTION: main
06-08 05:21:11.785: E/AndroidRuntime(3584): java.lang.IllegalStateException: Could not execute method of the activity
06-08 05:21:11.785: E/AndroidRuntime(3584):     at android.view.View$1.onClick(View.java:3599)
06-08 05:21:11.785: E/AndroidRuntime(3584):     at android.view.View.performClick(View.java:4204)
06-08 05:21:11.785: E/AndroidRuntime(3584):     at android.view.View$PerformClick.run(View.java:17355)
06-08 05:21:11.785: E/AndroidRuntime(3584):     at android.os.Handler.handleCallback(Handler.java:725)
06-08 05:21:11.785: E/AndroidRuntime(3584):     at android.os.Handler.dispatchMessage(Handler.java:92)
06-08 05:21:11.785: E/AndroidRuntime(3584):     at android.os.Looper.loop(Looper.java:137)
06-08 05:21:11.785: E/AndroidRuntime(3584):     at android.app.ActivityThread.main(ActivityThread.java:5041)
06-08 05:21:11.785: E/AndroidRuntime(3584):     at java.lang.reflect.Method.invokeNative(Native Method)
06-08 05:21:11.785: E/AndroidRuntime(3584):     at java.lang.reflect.Method.invoke(Method.java:511)
06-08 05:21:11.785: E/AndroidRuntime(3584):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
06-08 05:21:11.785: E/AndroidRuntime(3584):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
06-08 05:21:11.785: E/AndroidRuntime(3584):     at dalvik.system.NativeStart.main(Native Method)
06-08 05:21:11.785: E/AndroidRuntime(3584): Caused by: java.lang.reflect.InvocationTargetException
06-08 05:21:11.785: E/AndroidRuntime(3584):     at java.lang.reflect.Method.invokeNative(Native Method)
06-08 05:21:11.785: E/AndroidRuntime(3584):     at java.lang.reflect.Method.invoke(Method.java:511)
06-08 05:21:11.785: E/AndroidRuntime(3584):     at android.view.View$1.onClick(View.java:3594)
06-08 05:21:11.785: E/AndroidRuntime(3584):     ... 11 more
06-08 05:21:11.785: E/AndroidRuntime(3584): Caused by: java.lang.UnsupportedOperationException
06-08 05:21:11.785: E/AndroidRuntime(3584):     at java.util.AbstractList.add(AbstractList.java:404)
06-08 05:21:11.785: E/AndroidRuntime(3584):     at java.util.AbstractList.add(AbstractList.java:425)
06-08 05:21:11.785: E/AndroidRuntime(3584):     at android.widget.ArrayAdapter.add(ArrayAdapter.java:179)
06-08 05:21:11.785: E/AndroidRuntime(3584):     at net.learn2develop.UsingIntent.createtarget.submit(createtarget.java:136)
06-08 05:21:11.785: E/AndroidRuntime(3584):     ... 14 more
06-08 05:21:16.206: E/Trace(3614): error opening trace file: No such file or directory (2)

This is why you are getting this error: (stackoverflow.com/a/5125428/833647) — Ken Wolf
– Ken Wolf, Commented Jun 8, 2013 at 5:46
Your object array is empty by the way: Target=new String []{""}; — Ken Wolf
– Ken Wolf, Commented Jun 8, 2013 at 5:56
Yes i know, in the beginning it's empty, but i can add data to this — Sal-laS
– Sal-laS, Commented Jun 8, 2013 at 5:59
Also, please try to follow Android conventions when coding. Class names are supposed to start with Uppercase and follow CamelCase. It helps other coders to read your code if we all do the same even when we might not like it or think it's the best. ;) source.android.com/source/code-style.html — Martin Marconcini
– Martin Marconcini, Commented Oct 1, 2013 at 22:24

Rajesh Satvara · Accepted Answer · 2016-04-21 06:53:09Z

Try the below. have a arraylist. add string to arraylist and call notifiydatasetchanged() on your adapter

public class MainActivity extends ListActivity
{
stableArrayAdapter adapter;
ListView lstView; 
ArrayList<String> Target = new ArrayList<String>(); 
@Override
public void onCreate(Bundle savedInstanceState) 
{
   super.onCreate(savedInstanceState);
    lstView = getListView();
    lstView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);        
    lstView.setTextFilterEnabled(true);
    Target.add("hi");
    Target.add("hello");
    adapter = new stableArrayAdapter(this,android.R.layout.simple_list_item_checked, Target);
    setListAdapter(adapter);
    Target.add("myname");
    adapter.notifyDataSetChanged();
}   
class stableArrayAdapter extends ArrayAdapter<String> {


    public stableArrayAdapter(Context context, int textViewResourceId, ArrayList<String> target) 
    {
      super(context, textViewResourceId, target);

    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return Target.size();
    }

    @Override
    public String getItem(int position) {
        // TODO Auto-generated method stub
        return Target.get(position);
    }

    @Override
    public int getPosition(String item) {
        // TODO Auto-generated method stub
        return super.getPosition(item);
    }

    @Override
    public boolean hasStableIds() {
      return true;
    }

} 
}

As ken suggested.

public class MainActivity extends ListActivity
   {

    ListView lstView; 
    ArrayList<String> Target = new ArrayList<String>(); 
    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
       super.onCreate(savedInstanceState);
        lstView = getListView();
        lstView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);        
        lstView.setTextFilterEnabled(true);
        Target.add("hi");
        Target.add("hello");
       ;
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_checked, Target);
        setListAdapter(adapter);
        Target.add("myname");
        adapter.notifyDataSetChanged();
    }   
    }

enter image description here

Dear @Raghunandan doubtlessly you are a great programmer. I will be appreciate if i can be your friend in Facebook is it possible?

Karan Mavadhiya · Accepted Answer · 2013-06-08 05:58:45Z

3

I dont know these may help you or not..

As per my opinion You should check your xml file.. When you use getListView() method you should declare your Object of Listview like

android:id = @android:id/list

Or

use these line with your ArrayAdpater

arrAdapt.setNotifyOnChange(true);

May these help you..

edited Jun 8, 2013 at 5:58

answered Jun 8, 2013 at 5:48

Karan Mavadhiya

1,0628 silver badges24 bronze badges

Comments

Sagar Maiyad · Accepted Answer · 2013-06-08 05:42:54Z

0

you forgot to intialize your listview like below:

lstView = (ListView) findViewById(R.id.yourlistview);

and then

lstView = getListView();

answered Jun 8, 2013 at 5:42

Sagar Maiyad

12.7k9 gold badges66 silver badges102 bronze badges

1 Comment

Sal-laS Over a year ago

Although i extends ListActivity i should initialize the listView?

Shailendra · Accepted Answer · 2013-06-08 06:05:08Z

0

To use ListActiivity you have to use id of Listview as - android:id="@android:id/list" .

Then only you can get the instance of ListView by calling - getListView(); method .

answered Jun 8, 2013 at 6:05

Shailendra

3252 silver badges10 bronze badges

Comments

Community · Accepted Answer · 2017-05-23 12:33:44Z

0

You are encountering this problem.

You don't actually need to extend ArrayAdapter - currently it's not doing anything for you.

Instead do this:

 List<String> target = new ArrayList<String>();
 ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_checked, target);

Then later your .add() call will work.

edited May 23, 2017 at 12:33

CommunityBot

11 silver badge

answered Jun 8, 2013 at 6:01

Ken Wolf

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6 Comments

Ken Wolf Over a year ago

Well, it will show an empty list with your current code. That's what you want right? Or does it error?

Ken Wolf Over a year ago

You need to show us what you are doing here: net.learn2develop.UsingIntent.createtarget.submit(createtarget.java:136)

Ken Wolf Over a year ago

The way you are adding is wrong, that's what the above error says. I can't help more without more information about what else you are doing.

Sal-laS Over a year ago

I add the submit method in my question

Sal-laS Over a year ago

Dear @Ken Wolf, **ArrayAdapter ** lets me have colerful ListView and is a useful class

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