Question

我试图在用户点击ExpandableListView的子项时检索子项目。我的Activity和ListAdapter类如下所示..

MainActivity： -

public class MainActivity extends Activity {

    NewAdapter mNewAdapter;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        ExpandableListView expandbleLis = (ExpandableListView) findViewById(R.id.expandableListView);
        expandbleLis.setDividerHeight(2);
        expandbleLis.setGroupIndicator(null);
        expandbleLis.setClickable(true);

        setGroupData();
        setChildGroupData();

        mNewAdapter = new NewAdapter(groupItem, childItem);
        mNewAdapter
                .setInflater(
                        (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE),
                        this);
        expandbleLis.setAdapter(mNewAdapter);
        expandbleLis.setOnGroupClickListener(new OnGroupClickListener() {

            @Override
            public boolean onGroupClick(ExpandableListView parent, View v,
                    int groupPosition, long id) {
                Toast.makeText(MainActivity.this,
                        "GroupItem Clicked" + groupItem.get(groupPosition),
                        Toast.LENGTH_LONG).show();
                return false;
            }
        });
        expandbleLis.setOnChildClickListener(new OnChildClickListener() {

            @Override
            public boolean onChildClick(ExpandableListView parent, View v,
                    int groupPosition, int childPosition, long id) {
                Toast.makeText(MainActivity.this, "ChildItem Clicked",
                        Toast.LENGTH_LONG).show();

                return false;
            }
        });

    }

    public void setGroupData() {
        groupItem.add("TechNology");
        groupItem.add("Mobile");
        groupItem.add("Manufacturer");
        groupItem.add("Extras");
    }

    ArrayList<String> groupItem = new ArrayList<String>();
    ArrayList<Object> childItem = new ArrayList<Object>();

    public void setChildGroupData() {
        /**
         * Add Data For TecthNology
         */
        ArrayList<String> child = new ArrayList<String>();
        child.add("Java");
        child.add("Drupal");
        child.add(".Net Framework");
        child.add("PHP");
        childItem.add(child);

        /**
         * Add Data For Mobile
         */
        child = new ArrayList<String>();
        child.add("Android");
        child.add("Window Mobile");
        child.add("iPHone");
        child.add("Blackberry");
        childItem.add(child);
        /**
         * Add Data For Manufacture
         */
        child = new ArrayList<String>();
        child.add("HTC");
        child.add("Apple");
        child.add("Samsung");
        child.add("Nokia");
        childItem.add(child);
        /**
         * Add Data For Extras
         */
        child = new ArrayList<String>();
        child.add("Contact Us");
        child.add("About Us");
        child.add("Location");
        child.add("Root Cause");
        childItem.add(child);
    }

}

ListAdapter： -

public class NewAdapter extends BaseExpandableListAdapter {

    public ArrayList<String> groupItem, tempChild;
    public ArrayList<Object> Childtem = new ArrayList<Object>();
    public LayoutInflater minflater;
    public Activity activity;

    public NewAdapter(ArrayList<String> grList, ArrayList<Object> childItem) {
        groupItem = grList;
        this.Childtem = childItem;
    }

    public void setInflater(LayoutInflater mInflater, Activity act) {
        this.minflater = mInflater;
        activity = act;
    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return null;
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {
        return 0;
    }

    @Override
    public View getChildView(int groupPosition, final int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {
        tempChild = (ArrayList<String>) Childtem.get(groupPosition);
        TextView text = null;
        if (convertView == null) {
            convertView = minflater.inflate(R.layout.childrow, null);
        }
        text = (TextView) convertView.findViewById(R.id.textView1);
        text.setText(tempChild.get(childPosition));
        return convertView;
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        return ((ArrayList<String>) Childtem.get(groupPosition)).size();
    }

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

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

    @Override
    public void onGroupCollapsed(int groupPosition) {
        super.onGroupCollapsed(groupPosition);
    }

    @Override
    public void onGroupExpanded(int groupPosition) {
        super.onGroupExpanded(groupPosition);
    }

    @Override
    public long getGroupId(int groupPosition) {
        return 0;
    }

    @Override
    public View getGroupView(final int groupPosition, boolean isExpanded,
            View convertView, ViewGroup parent) {
        // isExpanded = false;
        if (convertView == null) {
            convertView = minflater.inflate(R.layout.grouprow, null);
        }
        ((CheckedTextView) convertView).setText(groupItem.get(groupPosition));

        ((CheckedTextView) convertView).setChecked(isExpanded);

        return convertView;
    }

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

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

}

我用Google搜索了this，但没有用，我没有从中获取子项。请帮忙这样做。

在尝试了许多可能的解决方案后，我发布此信息请尝试帮助我不要投票，如果你投票反对说可能的解决方案然后我同意..

Answer 1

多个问题：

需要选择子项才能使点击工作。更改适配器的isChildSelectable()以返回true。
从android:clickable="true"根childrow.xml移除LinearLayout。（或者，将点击处理程序添加到LinearLayout本身。）
实施getGroup()和getChild()以返回实际对象，而不是null和getGroupId()以及getChildId()，以返回本地唯一标识符。也就是说，组内的子ID必须是唯一的，但它们不需要在组之间是唯一的。在您的情况下，将子/组位置作为id返回。

Answer 2

在ListAdapter，

中

更改

的return值

public Object getGroup(int groupPosition)

和

getGroupId(int groupPosition)

到

return groupPosition;

从ExpandableListView检索ChildItem？

2 个答案: