Question

这是我的问题：我花了好几个小时试图让ExpandableListView工作。最后我做到了。然后我尝试将此代码填充到需要此ListView的现有应用程序中。现在它不再起作用了。 ListView没有真正展开（children = items）没有显示。你知道出了什么问题吗？我试图清理代码并删除与此ExpandableListView无关的活动部分。这就是它的样子：（非常感谢您的任何帮助）

    public class ExpandableAdapter extends BaseExpandableListAdapter {

private List<GroupCat> catList;
    private Context ctx;
NewGraveActivity app;

public ExpandableAdapter(List<GroupCat> catList, Context ctx, NewGraveActivity app) {
    this.catList = catList;
    this.ctx = ctx;
    this.app = app;
}

@Override
public Object getChild(int groupPosition, int childPosition) {
    return catList.get(groupPosition).getItemList().get(childPosition);
}

@Override
public long getChildId(int groupPosition, int childPosition) {
    return catList.get(groupPosition).getItemList().get(childPosition).hashCode();
}

@Override
public View getChildView(final int groupPosition, int childPosition,
        boolean isLastChild, View convertView, ViewGroup parent) {

    View v = convertView;

    if (v == null) {
        LayoutInflater inflater = (LayoutInflater)ctx.getSystemService
                  (Context.LAYOUT_INFLATER_SERVICE);
        v = inflater.inflate(R.layout.item_layout, parent, false);
    }

    CheckBox itemCheck = (CheckBox) v.findViewById(R.id.itemCheck);
    TextView itemName = (TextView) v.findViewById(R.id.itemName);

    if (app.selected.containsKey((groupPosition))==true)               
        itemCheck.setChecked(true);
    else
        itemCheck.setChecked(false);


    Category child = catList.get(groupPosition).getItemList().get(childPosition);

    itemName.setText(child.getName());

    itemCheck.setOnCheckedChangeListener(new CheckListener(childPosition, app));

    return v;
}

@Override
public int getChildrenCount(int groupPosition) {
    int size = catList.get(groupPosition).getItemList().size();
    System.out.println("Child for group ["+groupPosition+"] is ["+size+"]");
    return size;
}

@Override
public Object getGroup(int groupPosition) {
    return catList.get(groupPosition);
}

@Override
public int getGroupCount() {
  return catList.size();
}

@Override
public long getGroupId(int groupPosition) {
    return catList.get(groupPosition).hashCode();
}

@Override
public View getGroupView(int groupPosition, boolean isExpanded,
        View convertView, ViewGroup parent) {

    View v = convertView;

    if (v == null) {
        LayoutInflater inflater = (LayoutInflater)ctx.getSystemService
                  (Context.LAYOUT_INFLATER_SERVICE);
        v = inflater.inflate(R.layout.group_layout, parent, false);
    }

    TextView groupName = (TextView) v.findViewById(R.id.groupName);

    GroupCat cat = catList.get(groupPosition);

    groupName.setText(cat.getGroupName());

    return v;
}

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

@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
    return true;
}

}

public class NewGraveActivity extends Activity {


ExpandableListView categoryList;
private List<GroupCat> catList;
public HashMap<Integer, Boolean> selected;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    initData();

    setContentView(R.layout.activity_newgrave);



    ///////////////////////////// --- CATEGORIES LISTVIEW --- ///////////////////

    selected = new HashMap<Integer, Boolean>();

    ExpandableListView exList = (ExpandableListView) findViewById(R.id.expandableListView1);
    exList.setIndicatorBounds(5, 5);
    ExpandableAdapter exAdpt = new ExpandableAdapter(catList, this, this);
    exList.setIndicatorBounds(0, 20);
    exList.setAdapter(exAdpt);      

}

private void initData() {
    catList = new ArrayList<GroupCat>();

    GroupCat cat1 = createCategory("Categories", 1);
    cat1.setItemList(createItems());

    catList.add(cat1);
    Log.d("NewGrave initData", "Liste von Kategroien erstellt");
}

private GroupCat createCategory(String name, long id) {
    Log.d("NewGrave CreateCategory", "Kategorie erzeugen");
    return new GroupCat(id, name);
}


private List<Category> createItems() {
    List<Category> result = new ArrayList<Category>();

    String[] array = getResources().getStringArray(R.array.categoryNames);

    for (int i=0; i < array.length; i++) {
        Category item = new Category(i, array[i]);
        result.add(item);
        Log.d("createItems", item.getName());
    }
    Log.d("NewGrave createItems", "Items in Liste erledigt");
    for (int i = 0; i < result.size(); i++) {
        Log.d("ItemDetail enthalten:", result.get(i).getName());
    }

    return result;
}

}

这些是我的xml布局文件：

一般活动的布局：

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

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" >

        <TextView
            android:id="@+id/labelInCategories"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/labelInCategories" />

        <ExpandableListView
            android:id="@+id/expandableListView1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp" >
       </ExpandableListView>

        <Button
            android:id="@+id/buttonNewGrave"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/buttonNewGrave" />


    </LinearLayout>

</ScrollView>

ExpandableListView中的组布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/groupName"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingLeft="15dip" />

    <TextView
        android:id="@+id/groupDescr"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:textSize="8dip" />

</LinearLayout>

ExpandableListView中项目的布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <CheckBox
        android:id="@+id/itemCheck"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
    />

    <TextView
        android:id="@+id/itemName"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
         />
</LinearLayout>

ExpandableListView行为不正常

0 个答案: