Question

I’m trying to get my ArrayList of HashMaps to try to get a working ListAdapter. When I run this, I’m getting a

java.lang.RuntimeException: Your content must have a ListView whose id attribute is android.R.id.list

error. Here’s what I have:

gameList is where I’m getting my data from:

gameList.toString() returns: [{turn=1, opponent=UserTwo, streak=4, hintX=1234, player=UserOne, solution=MySolution, hintY=5678}, {turn=0, opponent=UserThree, streak=12, hintX=1344, player=UserOne, solution=SolutionTwo, hintY=5428}]

My ListActivity class:

public class GameListActivity extends ListActivity{

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

    String GAME_ITEM = "game";
    String PLAYER_ITEM = "player";
    String OPPONENT_ITEM = "opponent";
    String SOLUTION_ITEM = "solution";
    String HINTX_ITEM = "hintX";
    String HINTY_ITEM = "hintY";
    String STREAK_ITEM = "streak";
    String TURN_ITEM = "turn";

ArrayList<HashMap<String, String>> gameList = new ArrayList<HashMap<String, String>>();
AppVars gameVars = ((AppVars) getApplicationContext());
gameList = gameVars.getState();

String[] keyList = new String[] { OPPONENT_ITEM, STREAK_ITEM, TURN_ITEM };

ListAdapter adapter = new SimpleAdapter(this, gameList, R.layout.game_list_item, 
                        keyList, 
                        new int[] {R.id.opponent, R.id.streak, R.id.turn});
setListAdapter(adapter);        

}   

XML:

game_list_item.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:padding="5dp" >

    <ImageView
        android:id="@+id/thumbnail"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_alignParentTop="true"
        android:src="@android:drawable/alert_dark_frame" />

    <TextView
        android:id="@+id/opponent"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/thumbnail"
        android:layout_centerHorizontal="true"
        android:text="Entry"
        android:textSize="30sp" />

    <TextView
        android:id="@+id/streak"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/thumbnail"
        android:layout_centerHorizontal="true"
        android:text="Streak"
        android:textSize="20sp" />

    <TextView
        android:id="@+id/turn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/streak"
        android:layout_centerHorizontal="true"
        android:text="Your turn!"
        android:textSize="20sp" />

</RelativeLayout>

game_list.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/blackboard" >

    <ListView
        android:id="@+id/gameList"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true" >
    </ListView>

</RelativeLayout>

Answer 1

java.lang.RuntimeException: Your content must have a ListView whose id
attribute is android.R.id.list

So error log tells you everything

You need to add to your XML file of ListView android.R.id.list

<ListView
   android:id="@android:id/list"
   // next attributes
/>

Exactly when your Activity extends from ListActivity, you should to use this.

Here is info from docs

ListActivity has a default layout that consists of a single,
full-screen list in the center of the screen. However, if you desire,
you can customize the screen layout by setting your own view layout
with setContentView() in onCreate(). To do this, your own view MUST
contain a ListView object with the id “@android:id/list” (or list if
it’s in code)

So for more information have look at ListActivity.