Question

So I am trying to get a ListView to be populated underneath a button on the same layout. Basically when a ListView option is selected the button will respond differently to each selected option. The issue is it is getting a Force close and it seems to be a problem with populating the ListView.

    <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/background"
    >
<Button
    android:background="@drawable/button"  
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content"
    android:layout_marginTop="15dp" 
    android:layout_gravity="center"
    android:id="@+id/button"/>

    <ListView
    android:listSelector="#990000"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_marginTop="10dp"
    android:id="@+id/listview"
    />
</LinearLayout>

Code:

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.main);

    lv = (ListView) findViewById(R.id.listview);

    ArrayList<String> list = new ArrayList<String>();
    soundsList.add("one");
soundsList.add("two");
soundsList.add("three");



    ArrayAdapter<String> arrayAdapter =      
             new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, list);
             lv.setAdapter(arrayAdapter);

The Logcat readout is this:

08-23 10:21:23.735: ERROR/AndroidRuntime(588): Caused by: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'

I have tried exactly what it says in the ArrayAdapter… (android.R.id.list. I’ve tried numerous other things including an extends ListActivity, but regardless of what I try I seem to get a similar Logcat response.

Is there a better way to pull off what I am trying to accomplish? I want the button above the ListView all on the same main.xml.

Thanks in advance.

EDIT:

I had also tried this code. Currently commented out, but it was what I tried originally.

setListAdapter(new ArrayAdapter<String>(this, android.R.id.list,LIST));

    ListView listView = getListView();
    listView.setTextFilterEnabled(true);

LIST is a Strings array. The output on Logcat from the above code was the same as the previous.

Answer 1

Sounds like you are either trying to implement a ListActivity or a ListFragment, which expects to find a listview instance with a specific name, hence the error. Try changing the id of your listview from:

android:id="@+id/listview"

to:

android:id="@android:id/list"

I know that you said that you already tried this, but given your code, it looks like its still wrong. Once you change it can you post the new error message? I realize according to your description that it’s going to be a similar message, but even if the difference is slight it’s probably still significant.

EDIT:

Another thing I just noticed – if you are indeed using ListActivity or FragmentActivity, get a ref to the ListView by calling getListView() instead offindViewById()`.