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我實施了一個小應用程序兩個檢查一些ExpandableListView我在一個更大的應用程序中的錯誤。我閱讀並通過this和that後。但後來我決定在第一次運行時不使用ViewHolder模式來實現ExpandableListView適配器。Android ExpandableListView兒童interdepending也沒有ViewHolder
但是，當打開和關閉父視圖時，我仍然有一個錯誤。這裏是我的MainActivity：
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ExpandableListView expandableListView = (ExpandableListView) findViewById(R.id.exp_list_view);
List<Parent> parentList = new ArrayList<>();
Parent parent;
List<Child> childList;
childList = new ArrayList<>();
childList.add(new Child("One")); childList.add(new Child("Two")); childList.add(new Child("Three"));
parent = new Parent("First", childList);
parentList.add(parent);
childList = new ArrayList<>();
childList.add(new Child("One")); childList.add(new Child("Two")); childList.add(new Child("Three"));
parent = new Parent("Second", childList);
parentList.add(parent);
childList = new ArrayList<>();
childList.add(new Child("One")); childList.add(new Child("Two")); childList.add(new Child("Three"));
parent = new Parent("Third", childList);
parentList.add(parent);
childList = new ArrayList<>();
childList.add(new Child("One")); childList.add(new Child("Two")); childList.add(new Child("Three"));
parent = new Parent("Forth", childList);
parentList.add(parent);
final MyAdapter adapter = new MyAdapter(this, parentList);
expandableListView.setAdapter(adapter);
}
}
我的適配器類：
class MyAdapter extends BaseExpandableListAdapter {
private final List<Parent> mParentList;
private final Context mContext;
public MyAdapter(final Context context, final List<Parent> parentList) {
mContext = context;
mParentList = parentList;
}
@Override
public int getGroupCount() {
return mParentList.size();
}
@Override
public int getChildrenCount(final int groupPosition) {
return mParentList.get(groupPosition).getChildList().size();
}
@Override
public Object getGroup(final int groupPosition) {
return mParentList.get(groupPosition);
}
@Override
public Object getChild(final int groupPosition, final int childPosition) {
return mParentList.get(groupPosition).getChildList().get(childPosition);
}
@Override
public long getGroupId(final int groupPosition) {
return groupPosition;
}
@Override
public long getChildId(final int groupPosition, final int childPosition) {
return childPosition;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public View getGroupView(final int groupPosition, final boolean isExpanded, final View convertView, final ViewGroup parent) {
View v = convertView;
if (v == null) {
LayoutInflater inflater = LayoutInflater.from(mContext);
v = inflater.inflate(R.layout.row_parent, parent, false);
}
TextView tvn = (TextView) v.findViewById(R.id.tv_parent_name);
tvn.setText(mParentList.get(groupPosition).getName());
return v;
}
@Override
public View getChildView(final int groupPosition, final int childPosition, final boolean isLastChild, final View convertView, final ViewGroup parent) {
View row = convertView;
if (row == null) {
LayoutInflater inflater = LayoutInflater.from(mContext);
row = inflater.inflate(R.layout.row_child, parent, false);
}
TextView tvn = (TextView) row.findViewById(R.id.tv_child_name);
Switch sw = (Switch) row.findViewById(R.id.sw_child);
tvn.setText(mParentList.get(groupPosition).getChildList().get(childPosition).getName());
sw.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(final CompoundButton buttonView, final boolean isChecked) {
Log.v(getClass().getName(), "onCheckedChanged() (" + groupPosition + ", " + childPosition + ")");
}
});
return row;
}
@Override
public boolean isChildSelectable(final int groupPosition, final int childPosition) {
return false;
}
和我的兩個模型類。家長：
public class Parent {
private String name;
private List<Child> childList = new ArrayList<>();
public Parent(final String name, List<Child> childList) {
this.name = name;
this.childList = childList;
}
public String getName() {
return name;
}
public void setName(final String name) {
this.name = name;
}
public List<Child> getChildList() {
return childList;
}
public void setChildList(final List<Child> childList) {
this.childList = childList;
}
}
兒童：
public class Child {
private String name;
public Child(final String name) {
this.name = name;
}
public String getName() {
return name;
}
public void setName(final String name) {
this.name = name;
}
}
現在我觀察上運行的活動如下問題。請遵循：
- 展開所有的父母（從第一個到等）
- 點擊切換從父第二個和兩個來回（從上到下）
- unexpand所有的父母（從第一個到類推）
- unexpand所有的父母（從第一個到等）
觀察：
- 秒家長：只有一個和兩個選擇
- 的家長：一，二和三是選擇
- 提出父：只有兩個選擇
這是怎麼回事錯在這裏？此外，實現ViewHolder模式也不起作用。