如何从组键获取组在可扩展列表视图中的位置?

How to get position of group in expandablelistview from group key?

上下文: 我已经创建了一个搜索功能,它 returns 结果是一个列表视图,当我点击其中一个结果时,我想让应用程序转到我的其他活动之一,一个屏幕,它只是一个可扩展的列表视图,由一个 HashMap,滚动到在搜索中单击的项目,然后展开该组。

我已经知道的: 我有搜索功能,它生成列表,当您单击某个项目时,它会将您带到正确的 activity 列表视图。我看了 this question and know I can scroll to a specific item, and thanks to this question 我知道我可以展开列表中的特定项目。当我发送启动 activity 的意图时,我添加了作为额外数据单击的文本,然后我在新的 activity.

中检索数据

我不知道的: 在我发送启动新列表视图 activity 的意图后,我检索了我放入的额外数据,这是一个字符串,它是父视图中 hashmap/the 文本中项目的键我想扩大。如何从组的key中得到我要展开的组的位置? (这样我最终可以调用该对象的滚动和扩展方法)

我的可搜索 activity 中启动新 activity 的方法:

private void doSearch(Cursor query) {
        // get a Cursor, prepare the ListAdapter
        // and set it
        Cursor c = query;
        startManagingCursor(c);


        String[] from = new String[] {"QUANTITY", "_id"};
        int[] to = new int[] {android.R.id.text1};
        SimpleCursorAdapter cursorAdapter = new SimpleCursorAdapter(this, android.R.layout.simple_list_item_1, c, from, to);
        mListView.setAdapter(cursorAdapter);
        Log.e("doSearch method:", "has been called");

        mListView.setOnItemClickListener(
                new AdapterView.OnItemClickListener() {
                    public void onItemClick(AdapterView<?> parent, View view,
                                            int position, long id) {
                        // When clicked, log with the TextView text

                        Log.e("doSearch method:", "Answer: " + ((TextView) view).getText());

                        if(cMap.containsKey(((TextView) view).getText())){
                            Intent i=new Intent(getApplicationContext(),CommonConstants.class);
                            i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                            i.putExtra("key", ((TextView) view).getText());
                            getApplicationContext().startActivity(i);

                        } else if (chMap.containsKey(((TextView) view).getText())){
                            Intent i=new Intent(getApplicationContext(),PhysicoChemicalConstants.class);
                            i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                            i.putExtra("key", ((TextView) view).getText());
                            getApplicationContext().startActivity(i);

                        } else if (aMap.containsKey(((TextView) view).getText())){
                            Intent i=new Intent(getApplicationContext(),AtomicNuclearConstants.class);
                            i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                            i.putExtra("key", ((TextView) view).getText());
                            getApplicationContext().startActivity(i);

                        }
                        else if (eMap.containsKey(((TextView) view).getText())){
                            Intent i=new Intent(getApplicationContext(),ElectromagneticConstants.class);
                            i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                            i.putExtra("key", ((TextView) view).getText());
                            getApplicationContext().startActivity(i);

                        }
                        else{
                            Log.e("doSearch method:", "not any map ");
                        }


                    }
                });
    }

新的listviewactivity通过之前的方法启动:

public class PhysicoChemicalConstants extends SearchViewActivity {

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

        MyDataProvider dp = new MyDataProvider(this);

        ExpandableListView view;
        view = (ExpandableListView) findViewById(R.id.expandableList);
        HashMap constantsHashMap;
        constantsHashMap = dp.getChemMap();
        ArrayList constantsHashMapKeys = new ArrayList<String>(constantsHashMap.keySet());

        MyCustomAdapter adapter = new MyCustomAdapter(this, constantsHashMap, constantsHashMapKeys);
        view.setAdapter(adapter);

        Intent intent = getIntent();
        String mKey = intent.getStringExtra("key");




//creates toolbar
        Toolbar myToolbar = (Toolbar) findViewById(R.id.my_toolbar);
        setSupportActionBar(myToolbar);
    }



}

非常感谢您的帮助!

好的,经过深思熟虑,我想到了一种方法,尽管我不确定这是最优雅的方法。

我在发送打开 expandableListView 的意图后(在额外数据中包含所选项目的键),我收到了额外数据,然后制作了一个包含 HashMap 的所有键的 arrayList 用于填充列表。我使用简单的 for 循环搜索 arrayList,然后在找到匹配项时返回位置,让我可以轻松调用 smoothScrollToPosition()expandGroup() 方法。下面是我的 ExpandableListView class,希望有人能从中受益。

public class CommonConstants extends SearchViewActivity {
    View view;
    String searchedCon;
    MyDataProvider dp;
    HashMap constantsHashMap;
    ArrayList constantsHashMapKeys;


    //finds view and hashmap, passes to adapter to display
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_common_constants);

        dp = new MyDataProvider(this);
        ExpandableListView view;
        view = (ExpandableListView) findViewById(R.id.expandableList);

        constantsHashMap = dp.getCommonMap();
        constantsHashMapKeys = new ArrayList<String>(constantsHashMap.keySet());

        MyCustomAdapter adapter = new MyCustomAdapter(this, constantsHashMap, constantsHashMapKeys);
        view.setAdapter(adapter);

        int pos;
        Intent intent = getIntent();
        searchedCon = intent.getStringExtra("key");
        if(searchedCon != null){
            pos = handleIntent(intent);
            view.smoothScrollToPosition(pos);
            view.expandGroup(pos);

        }






//creates toolbar
        Toolbar myToolbar = (Toolbar) findViewById(R.id.my_toolbar);
        setSupportActionBar(myToolbar);

    }

    private int handleIntent(Intent intent) {

        searchedCon = intent.getStringExtra("key");
        boolean exist = false;
        int i;

        for( i  = 0; i<constantsHashMapKeys.size();i++){
            if (constantsHashMapKeys.get(i).equals(searchedCon)) {
                exist = true;
                break;
            }
        }
        if(exist){
            return i;
        }else{
            return 0;
        }
    }



}