在 ExpandableListView 是有可能最初选择一个子项，以便包含组展开，并将列表滚动到这个孩子的位置？

我觉得 setSelectedChild 会做的伎俩，但它不给任何结果。

我用下面这段code测试

 公共类MainActivity延伸活动{

私有静态最后弦乐TITLE =称号;

@燮pressWarnings（串行）
@覆盖
保护无效的onCreate（包savedInstanceState）{
    super.onCreate（savedInstanceState）;

    ExpandableListView的ListView =新ExpandableListView（本）;
    SimpleExpandableListAdapter适配器=新SimpleExpandableListAdapter（这一点，
        新的ArrayList＆LT;地图＆LT;字符串，字符串＆GT;＆GT;（）{
            {
                this.add（新的HashMap＆LT;字符串，字符串＆GT;（）{
                    {
                        this.put（TITLE组1）;
                    }
                }）;
                this.add（新的HashMap＆LT;字符串，字符串＆GT;（）{
                    {
                        this.put（TITLE组2）;
                    }
                }）;
                this.add（新的HashMap＆LT;字符串，字符串＆GT;（）{
                    {
                        this.put（TITLE组3）;
                    }
                }）;
            }
        }，
        android.R.layout.simple_expandable_list_item_1，
        新的String [] {标题}，
        新的INT [] {} android.R.id.text1，
        新的ArrayList＆LT;名单，LT ;?扩展地图＆LT;字符串，字符串＆GT;＆GT;＆GT;（）{
            {
                this.add（新的ArrayList＆LT;地图＆LT;字符串，字符串＆GT;＆GT;（）{
                    {
                        this.add（新的HashMap＆LT;字符串，字符串＆GT;（）{
                            {
                                this.put（TITLE，孩子1-1）;
                            }
                        }）;
                        this.add（新的HashMap＆LT;字符串，字符串＆GT;（）{
                            {
                                this.put（TITLE，孩子1-2）;
                            }
                        }）;
                    }
                }）;
                this.add（新的ArrayList＆LT;地图＆LT;字符串，字符串＆GT;＆GT;（）{
                    {
                        this.add（新的HashMap＆LT;字符串，字符串＆GT;（）{
                            {
                                this.put（TITLE，孩子2-1）;
                            }
                        }）;
                        this.add（新的HashMap＆LT;字符串，字符串＆GT;（）{
                            {
                                this.put（TITLE，孩子2-2）;
                            }
                        }）;
                    }
                }）;
                this.add（新的ArrayList＆LT;地图＆LT;字符串，字符串＆GT;＆GT;（）{
                    {
                        this.add（新的HashMap＆LT;字符串，字符串＆GT;（）{
                            {
                                this.put（TITLE，孩子3-1）;
                            }
                        }）;
                        this.add（新的HashMap＆LT;字符串，字符串＆GT;（）{
                            {
                                this.put（TITLE，孩子3-2）;
                            }
                        }）;
                    }
                }）;
            }
        }，
        android.R.layout.simple_expandable_list_item_2，
        新的String [] {标题}，
        新的INT [] {} android.R.id.text1
    ）;
    listView.setAdapter（适配器）;
    的setContentView（ListView控件）;

    listView.setSelectedChild（1，1，真）;
}
}
 

解决方案

添加一个调用 listView.expandGroup（）在 setSelectedChild（）。

在 shouldExpandGroup 参数设置为true的 setSelectedChild（）似乎只是为了工作，如果有至​​少一个组扩大摆在首位。

In an ExpandableListView is it possible to initially select a child item so that the containing group is expanded and the list is scrolled to this child's position ?

I thought setSelectedChild would do the trick but it doesn't give any result.

I tested with the following piece of code:

public class MainActivity extends Activity {

private static final String TITLE = "title";

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

    ExpandableListView listView = new ExpandableListView(this);
    SimpleExpandableListAdapter adapter = new SimpleExpandableListAdapter(this, 
        new ArrayList<Map<String,String>>() {
            {
                this.add(new HashMap<String, String>() {
                    {
                        this.put(TITLE, "Group 1");
                    }
                });
                this.add(new HashMap<String, String>() {
                    {
                        this.put(TITLE, "Group 2");
                    }
                });
                this.add(new HashMap<String, String>() {
                    {
                        this.put(TITLE, "Group 3");
                    }
                });
            }
        }, 
        android.R.layout.simple_expandable_list_item_1, 
        new String[] { TITLE }, 
        new int[] { android.R.id.text1 }, 
        new ArrayList<List<? extends Map<String,String>>>() {
            {
                this.add(new ArrayList<Map<String,String>>() {
                    {
                        this.add(new HashMap<String, String>() {
                            {
                                this.put(TITLE, "Child 1-1");
                            }
                        });
                        this.add(new HashMap<String, String>() {
                            {
                                this.put(TITLE, "Child 1-2");
                            }
                        });
                    }
                });
                this.add(new ArrayList<Map<String,String>>() {
                    {
                        this.add(new HashMap<String, String>() {
                            {
                                this.put(TITLE, "Child 2-1");
                            }
                        });
                        this.add(new HashMap<String, String>() {
                            {
                                this.put(TITLE, "Child 2-2");
                            }
                        });
                    }
                });
                this.add(new ArrayList<Map<String,String>>() {
                    {
                        this.add(new HashMap<String, String>() {
                            {
                                this.put(TITLE, "Child 3-1");
                            }
                        });
                        this.add(new HashMap<String, String>() {
                            {
                                this.put(TITLE, "Child 3-2");
                            }
                        });
                    }
                });
            }
        },
        android.R.layout.simple_expandable_list_item_2,
        new String[] { TITLE },
        new int[] { android.R.id.text1 }
    );
    listView.setAdapter(adapter);
    setContentView(listView);

    listView.setSelectedChild(1, 1, true);
}
}

Add a call to listView.expandGroup() before setSelectedChild().

The shouldExpandGroup parameter set to true in setSelectedChild() seems only to work if there's at least one group expanded in the first place.