尝试在带有光标但没有ListActivity的.xml中使用Listview

Question

I'm stumped as to how to properly implement an adapter that can pull a column of data from my sqlite database and add it to a listview (based on the android-provided multiple checkbox). All of the existing examples use the following:

   public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         String[] myList = new String[] {"Hello","World","Foo","Bar"};              
         ListView lv = new ListView(this);
         lv.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,myList));
         setContentView(lv);
         }

However, I don't want a string. Here's my code:

public class ListGroups extends Activity {
    /** Called when the activity is first created. */
    private ExpensesDbAdapter mDBHelper;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.view);
        ListView lv = (ListView)findViewById(R.id.list1);
        mDBHelper = new ExpensesDbAdapter(ListGroups.this);
        mDBHelper.open();
        Cursor c = mDBHelper.fetchAllGroups();
        startManagingCursor(c);
        String[] from = new String[] {ExpensesDbAdapter.KEY_GROUPNAME};
        int[] to = new int[] {R.id.groupname};
        ListAdapter ladapter = new SimpleCursorAdapter(ListGroups.this, R.layout.grouprow, c, from, to);
        lv.setAdapter(ladapter);
        lv.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
    }

}

Here's the view.xml file:

<?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:gravity="center">
    <TextView android:id="@+id/header01"
              android:orientation="vertical"
              android:layout_width="fill_parent"
              android:layout_height="fill_parent" 
              android:gravity="center"
              android:text="Select Groups"/>
    <ListView
        android:id="@+id/list1"
        android:layout_width="match_parent"
        android:layout_height="0dip"
        android:layout_weight="1" />
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/footerbutton01"
        android:text="Get Expense Reports" />
</LinearLayout>

And, because the SimpleCursorAdapter asks for it, here's the grouprow.xml:

<?xml version="1.0" encoding="utf-8"?>
<CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android"
     android:id="@+id/groupname"
     android:layout_width="match_parent"
     android:layout_height="?android:attr/listPreferredItemHeight"
     android:textAppearance="?android:attr/textAppearanceLarge"
     android:gravity="center_vertical"
     android:checkMark="?android:attr/listChoiceIndicatorMultiple"
     android:paddingLeft="6dip"
     android:paddingRight="6dip"/>

If I use a ListActivity and don't invoke the layout on Creation, I can get it to work, but I need the wrappers around that ListView, and I can't make the .addHeader and .addFooter methods work for me. Any help on creating the proper adapter would be appeciated.

Answer 1

Answered it with some help. Several things were wrong, mostly in the list.xml:

<?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:gravity="center">
    <TextView android:id="@+id/header01"
              android:orientation="vertical"
              android:layout_width="fill_parent"
              android:layout_height="fill_parent" 
              android:gravity="center"
              android:text="Select Groups"/>
    <ListView
        android:id="@android:id/android:list"
        android:layout_width="match_parent"
        android:layout_height="wrap_around"
        android:layout_weight="1" />
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/footerbutton01"
        android:text="Get Expense Reports" />
</LinearLayout>

This allows you to tie the ListView to that element in the xml. You don't have a name for it, but you can use getListView() in the onCreate method to access it.