我创建了一个树作为双可扩展列表视图，其中一个具有太多子项 (15) 的项比其他项多，并没有显示他的所有子项。
_ ______
+|_______|
_______
+|_______|
_______
|_______|
_______
|_______|
...
...
_______
|_______| // 11-th item
_______ // 12-th item can be seen a little and it-s clickable
_______
+|_______|
_______
+|_______|
...
...
_______
+|_______|
在第 12 项之后，列表被剪切。我没有对列表的大小施加任何限制。知道为什么会这样吗？谢谢！
编辑 这是第一个可扩展列表的代码。
<ExpandableListView android:layout_width="fill_parent" android:id="@+id/ParentLevel"
android:groupIndicator="@null" android:choiceMode="singleChoice"
android:layout_height="fill_parent"
android:layout_above="@id/button_layout"
android:paddingRight="5dp">
另一个子列表被添加到适配器的 getView() 方法中。
代码示例
//MainActivity.java
public class MainActivity extends Activity implements OnChildClickListener {
ExpandableListView elv;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// QUI SOTTO
Tree root = new Tree("root", 123);
for (int i = 0; i < 3; i++) {
Tree firstLevel = new Tree(("firstLevel" + i), i);
for (int j = 0; j < 6; j++) {
Tree secondLevel = new Tree("secondLevel" + j, j);
for (int z = 0; z < 27; z++) {
Tree thirdLevel = new Tree("thirdLevel" + z, z);
secondLevel.addChild(thirdLevel);
}
firstLevel.addChild(secondlevel);
}
root.addChild(firstLevel);
}
elv = new ExpandableListView(this);
final TreeAdapter treeAdapter = new TreeAdapter(this, root, this);
elv.setAdapter(treeAdapter);
elv.setChoiceMode(ExpandableListView.CHOICE_MODE_SINGLE);
elv.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v,
int groupPosition, long id) {
for (int i = 0; i < treeAdapter.getGroupCount(); i++) {
elv.collapseGroup(i);
}
elv.expandGroup(groupPosition);
return true;
}
});
setContentView(elv);
elv.expandGroup(0);
Entry e = treeAdapter.lsfirst[0];
e.cls.expandGroup(1);
treeAdapter.selectedClass = 33;
}
树适配器.java
public class TreeAdapter extends BaseExpandableListAdapter {
final static String TAG = TreeAdapter.class.getSimpleName();
static public Integer selectedClass = null;
static int CHILD_PADDING;
static float TEXT_SIZE;
private Tree tree;
private OnChildClickListener lst;
final private Context context;
class Entry{
final CustExpListview cls;
final SecondLevelAdapter sadtp;
public Entry(CustExpListview cls, SecondLevelAdapter sadtp) {
this.cls = cls;
this.sadtp = sadtp;
}
}
Entry[] lsfirst;
public TreeAdapter(MainActivity ctx, Tree tree, OnChildClickListener lst){
this.context = ctx;
this.tree = tree;
this.lst = lst;
TEXT_SIZE = 35;
CHILD_PADDING = 40;
lsfirst = new Entry[tree.getChilds().size()];
for(int i=0; i<tree.getChilds().size();i++){
CustExpListview SecondLevelexplv = new CustExpListview(context);
SecondLevelAdapter adp = new
SecondLevelAdapter(tree.getChilds().get(i));
SecondLevelexplv.setAdapter(adp);
SecondLevelexplv.setGroupIndicator(null);
SecondLevelexplv.setOnChildClickListener(lst);// add listener
lsfirst[i] = new Entry(SecondLevelexplv, adp);
}
}
@Override
public Object getChild(int arg0, int arg1){
return arg1;
}
@Override
public long getChildId(int groupPosition, int childPosition){
return childPosition;
}
@Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent){
//LISTA DI secondlevel
return lsfirst[groupPosition].cls;
}
@Override
public int getChildrenCount(int groupPosition){
return 1;
}
@Override
public Object getGroup(int groupPosition) {
return groupPosition;
}
@Override
public int getGroupCount() {
return tree.getChilds().size();
}
@Override
public long getGroupId(int groupPosition) {
return tree.getChilds().get(groupPosition).getId();
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent){
//firstlevel
TextView tv = new TextView(context);
tv.setText(tree.getChilds().get(groupPosition).getName());
tv.setPadding(3, 7, 7, 7);
return tv;
}
@Override
public boolean hasStableIds(){
return true;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
/////////////////////////////////////////////////////////////////////////////
//_____________-------------________----------________---------_______-----//
/////////////////////////////////////////////////////////////////////////////
public class CustExpListview extends ExpandableListView{
int intGroupPosition, intChildPosition, intGroupid;
public CustExpListview(Context context)
{
super(context);
this.setSelector(R.drawable.divider_gray);
}
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
widthMeasureSpec = MeasureSpec.makeMeasureSpec(960, MeasureSpec.AT_MOST);
heightMeasureSpec = MeasureSpec.makeMeasureSpec(600, MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
public class SecondLevelAdapter extends BaseExpandableListAdapter{
Tree tree2;
public SecondLevelAdapter(Tree tr) {
this.tree2 = tr;
}
//Returns the id of the selected class
@Override
public Object getChild(int groupPosition, int childPosition) {
return tree2.getChilds().get(groupPosition).getChilds().get(childPosition).getId();
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return tree2.getChilds().get(groupPosition).getChilds().get(childPosition).getId();
}
@Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
//thirdlevel
TextView tv = new TextView(context);
tv.setText(tree2.getChilds().get(groupPosition).getChilds().get(childPosition).getName());
if(selectedClass!=null && selectedClass ==tree2.getChilds().get(groupPosition).getChilds().get(childPosition).getId()){
tv.setBackgroundResource(R.drawable.divider_gray);
}
tv.setPadding(2*CHILD_PADDING, 5, 300, 5);
return tv;
}
@Override
public int getChildrenCount(int groupPosition){
return tree2.getChilds().get(groupPosition).getChilds().size();
}
@Override
public Object getGroup(int groupPosition) {
return groupPosition;
}
@Override
public int getGroupCount() {
return tree2.getChilds().size();
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent)
{// secondlevel
TextView tv = new TextView(context);
tv.setText(tree2.getChilds().get(groupPosition).getName());
tv.setPadding(CHILD_PADDING, 7, 200, 7);
return tv;
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
}
}
树.java
public final class Tree {
final static String TAG=Tree.class.getSimpleName();
final private String name;
final private int id;
private Tree parent;
private LinkedList<Tree> childs = new LinkedList<Tree>();
public Tree(String name, int id) {
parent = null;
this.name = name;
this.id = id;
}
public void addChild(Tree child){
child.parent = this;
childs.add(child);
}
public int getId() {
return id;
}
public String getName() {
return name;
}
public Tree getParent() {
return parent;
}
public LinkedList<Tree> getChilds() {
return childs;
}
@Override
public String toString() {
Iterator<Tree> iter = childs.iterator();
String childs = "[";
while(iter.hasNext()){
Tree ch = iter.next();
childs = childs.concat(ch+",");
}
childs = childs.concat("]");
return name + " "+ id + childs;
}
}