Multi-level Android 中带有复选框的 ExpandableListView

Question

我正在尝试在 Android 中实现 3 级 ExpandableListView。

看起来像这样：

1 级
- 2 级
- 2级
  - 3 级
- 2 级
1 级
- 2 级
- 2 级

2 级和 3 级应该有 CheckBox-es。 And when CheckBox in Level 2 is selected, all his children in Level 3 are selected as well.

我已经完成了 2 个适配器 - 都扩展了 BaseExpandableListAdapter。所以最后我插入了 2 个 ExpandableListView-s - 一个用于 1 级 - 2 级，另一个用于 2 级 - 3 级。

我还有 2 个单独的布局 - 一个用于级别 1，一个用于级别 2-3（因为它们是相同的）。它s just aTextViewwith id insideRelativeView`.

题目：

当我将 TextView 更改为 CheckBoxes 并将文本设置为它们时，我无法将列表扩展到第三级。我不明白为什么会发生这种情况以及如何处理它，有人可以帮助我吗？
如何在没有 children 的 2 级项目中隐藏指标（那些箭头显示 expanded/collapsed 状态）？
我不明白为什么我的 ExpandableListView 不想垂直放满所有屏幕，它只占用了它的 1/4。我尝试更改 CustomExpandableListView 中的一些参数，但没有成功。

这里是一些截图：

截图一：

截图二：

如您所见，当我展开亚洲列表时，欧洲列表会自动隐藏。

这是级别 1 的代码：

public class RegionsAdapter extends BaseExpandableListAdapter {

private List<Object> objects;
private Activity activity;
private LayoutInflater inflater;

public RegionsAdapter(Activity activity, List<Object> objects) {
    this.objects = objects;
    this.activity = activity;
    this.inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

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

@Override
public long getChildId(int groupPosition, int childPosition) {
    return childPosition;
}

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

    Object object = (Object) getChild(groupPosition, childPosition);
    CustomExpandableListView subObjects = (CustomExpandableListView) convertView;

    if (convertView == null) {
        subObjects = new CustomExpandableListView(activity);
    }
    CountriesAdapter adapter = new CountriesAdapter(activity, object);
    subObjects.setAdapter(adapter);

    return subObjects;
}

@Override
public int getChildrenCount(int groupPosition) {
    return objects.get(groupPosition).getObjects().size();
}

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

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

@Override
public long getGroupId(int groupPosition) {
    return groupPosition;
}

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

    Object object = (Object) getGroup(groupPosition);
    if (convertView == null) {
        convertView = inflater.inflate(R.layout.layout_region_item, null);
    }

    TextView name = (TextView) convertView.findViewById(R.id.name);
    name.setText(object.getName());

    return convertView;
}

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

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

2-3级代码：

public class CountriesAdapter extends BaseExpandableListAdapter {

private Object object;
private LayoutInflater inflater;
private Activity activity;

public CountriesAdapter(Activity activity, Object object) {
    this.activity = activity;
    this.object = object;
    this.inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

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

@Override
public long getChildId(int groupPosition, int childPosition) {
    return childPosition;
}

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

    Object object = (Object) getChild(0, childPosition);
    if (convertView == null) {
        convertView = inflater.inflate(R.layout.layout_country_item, null);

        Resources r = activity.getResources();
        float px40 = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 40, r.getDisplayMetrics());
        convertView.setPadding(
                convertView.getPaddingLeft() + (int) px40,
                convertView.getPaddingTop(),
                convertView.getPaddingRight(),
                convertView.getPaddingBottom());
    }

    TextView name = (TextView) convertView.findViewById(R.id.name);
    name.setText(object.getName());

    return convertView;
}

@Override
public int getChildrenCount(int groupPosition) {

    if (object.getObjects() == null) {
        return 0;
    }
    return object.getObjects().size();
}

@Override
public Object getGroup(int groupPosition) {
    return object;
}

@Override
public int getGroupCount() {
    return 1;
}

@Override
public long getGroupId(int groupPosition) {
    return groupPosition;
}

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

    if (convertView == null) {
        convertView = inflater.inflate(R.layout.layout_country_item, null);
        Resources r = activity.getResources();
        float px20 = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 20, r.getDisplayMetrics());
        convertView.setPadding(
                convertView.getPaddingLeft() + (int) px20,
                convertView.getPaddingTop(),
                convertView.getPaddingRight(),
                convertView.getPaddingBottom());
    }

    TextView name = (TextView) convertView.findViewById(R.id.name);
    name.setText(object.getName());

    return convertView;
}

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

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

我还有一些自定义的 ExpandableListView:

public class CustomExpandableListView extends ExpandableListView {

public CustomExpandableListView(Context context) {
    super(context);
}

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);
}
}

而我的 MainActivity 代码：

public class MainActivity extends AppCompatActivity {

public static CustomExpandableListView list;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    List<Item> objectsLvl1 = new ArrayList<Item>();

    List<Item> objectsAsia = new ArrayList<Item>();
    List<Item> objectsEurope = new ArrayList<Item>();

    List<Item> objectsChina = new ArrayList<Item>();

    List<Item> objectsGermany = new ArrayList<Item>();

    objectsLvl1.add(new Item("Asia", objectsAsia));
    objectsLvl1.add(new Item("Europe", objectsEurope));

    objectsAsia.add(new Item("China", objectsChina));
    objectsAsia.add(new Item("Japan"));

    objectsChina.add(new Item("Central", null));
    objectsChina.add(new Item("North", null));
    objectsChina.add(new Item("South", null));


    RelativeLayout parent = (RelativeLayout) findViewById(R.id.parent);

    list = new CustomExpandableListView(this);
    RegionsAdapter regionsAdapter = new RegionsAdapter(this, objectsLvl1);
    list.setAdapter(regionsAdapter);

    if (parent != null) {
        parent.addView(list);
    }
}
}

Answer 1

最后我想通了。这就是答案。

用复选框扩展列表:

这个很简单。我在 getGroupView 方法中将 OnClickListener 添加到 TextView：

    View.OnClickListener clickListener = new View.OnClickListener() {
    @Override
    public void onClick(View v) {
            if (!isExpanded) {
                expandableListView.expandGroup(groupPosition);
            } else {
                expandableListView.collapseGroup(groupPosition);
            }
        }
    };

    holder.childName.setOnClickListener(clickListener);
    holder.childIndicator.setOnClickListener(clickListener);

隐藏指标：

替换标准指标和添加我自己的指标更容易。然后，在 getGroupView 中使用它。

首先，将默认的groupIndicator设置为null：

expandableListView.setGroupIndicator(null);

然后，使用自定义图像：

holder.childIndicator = (ImageView) convertView.findViewById(R.id.imgChildIndicator);

    if (getChildrenCount(groupPosition) == 0) {
        holder.childIndicator.setAlpha(0);
    } else {
        holder.childIndicator.setImageResource(isExpanded ? R.drawable.expanded : R.drawable.collapsed);
    }

最后，隐藏我所有 3 级物品的 groupIndicator：

holder.childIndicator.setAlpha(0);

对 1 级项目进行了相同的更改。

在屏幕上适配 ExpandableListView：

我把 ExpandableListView 放在 activity_main 中的 RelativeLayout 里。

并且在MainActivity:

里面改变了实现

ExpandableListView list = (ExpandableListView) findViewById(R.id.expandableListView_Parent);

    if (list != null) {
        ParentAdapter adapter = new ParentAdapter(this, objectsLvl1);
        list.setAdapter(adapter);
    }

这解决了我的问题，现在我有了全屏 ExpandableList。

Multi-level Android 中带有复选框的 ExpandableListView

Multi-level ExpandableListView with CheckBoxes in Android

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