如何使用多个Horizo​​ntalListView填充布局

Question

我有一个水平的Listview。它工作正常。我的ArrayList eList将显示穿过屏幕的ListView。太棒了。我的问题是eList有多行，这意味着eList可能是飞机，汽车和船只，或者是无数个对象。目前，此水平ListView将仅显示数据库中的所有类型的飞机或汽车或船只。如何根据有多少对象类型（飞机，汽车，船只，炸玉米饼，人）在屏幕上垂直显示多个或无限数量的hListView。

IN ACTIVITY

HorizontalListView hListView = (HorizontalListView) findViewById(R.id.hlistview1);
    hListView.setAdapter(new ItemAdapter());
    ArrayList<HashMap<String, String>> eList = controller.getAllts();
    ListAdapter adapter = new SimpleAdapter(Su.this,eList,R.layout.view_m_ts, images, ins);
hListView.setAdapter(adapter);

IN DATABASE

public ArrayList<HashMap<String, String>> getAllts() {
    ArrayList<HashMap<String, String>> List3;
    List3 = new ArrayList<HashMap<String, String>>();
    String selectQuery3 = "SELECT DISTINCT * FROM INV where p2 IS NOT NULL ORDER BY p2 COLLATE NOCASE ASC";
    SQLiteDatabase database = this.getWritableDatabase();
    Cursor cursor3 = database.rawQuery(selectQuery3, null);
    HashMap<String, String> map = new HashMap<String, String>();
    if (cursor3.moveToFirst()) {
        do {

            map.put("iImageL", cursor3.getString(13));
            map.put("p2", cursor3.getString(2));
            map.put("se2", cursor3.getString(10));
            map.put("te", cursor3.getString(17));
            List3.add(map);
        } while (cursor3.moveToNext());
    }
    close();
    return List3;
}

IN XML

 <LinearLayout
    android:id="@+id/LinearViewa"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_weight=".1"
    android:orientation="vertical" >

   <com.devsmart.android.ui.HorizontalListView
       android:id="@+id/hlistview1"
       android:layout_width="fill_parent"
       android:layout_height="10dp"
       android:layout_weight=".1"
       android:background="#000000" />

</LinearLayout>

Answer 1

我将假设所有不同类型的对象都在一个SQLite表中，其中一个列中存储的类型为字符串，并且每种类型都没有不同的表。

更改getAllts（）函数以返回HashMaps的ArrayLists的HashMap而不是HashMaps的ArrayList，这样就可以为HashMaps的每个ArrayList创建多个Horizo​​ntalListViews，每个都用于特定类型。当您遍历游标中返回的行时，获取类型并检查大HashMap中是否已存在ArrayList，如果没有则创建一个，如果是，则添加到现有的：

public HashMap<String, ArrayList<HashMap<String, String>>> getAllts() {
    HashMap<String, ArrayList<HashMap<String, String>>> hashMap = new HashMap<String, ArrayList<HashMap<String, String>>>();                

    String selectQuery3 = "SELECT DISTINCT * FROM INV where p2 IS NOT NULL ORDER BY p2 COLLATE NOCASE ASC";
    SQLiteDatabase database = this.getWritableDatabase();
    Cursor cursor3 = database.rawQuery(selectQuery3, null);

    int typeColumnIndex = 18; // <- You need to set the correct column here, possibly using cursor3.getColumnIndexOrThrow()

    if (cursor3.moveToFirst()) {
        do {
            // create this HashMap inside the loop because we need a new one each time:
            HashMap<String, String> map = new HashMap<String, String>();
            ArrayList<HashMap<String, String>> List3;

            // get the type of this entry as a string       
            String typename = cursor3.getString(typeColumnIndex);
            // check if there already is an ArrayList for this type:
            if(hashMap.containsKey(typename))
            {
                // get existing ArrayList for this type:
                List3 = hashMap.get(typename);
            }
            else
            {
                // create new ArrayList for this type:
                List3 = new ArrayList<HashMap<String, String>>();
                hashMap.put(typename, List3);
            }
            map.put("iImageL", cursor3.getString(13));
            map.put("p2", cursor3.getString(2));
            map.put("se2", cursor3.getString(10));
            map.put("te", cursor3.getString(17));
            List3.add(map);
        } while (cursor3.moveToNext());
    }
    close();
    return hashMap;
}

更改XML，以便在活动XML中有一个空的LinearLayout：

<LinearLayout
    android:id="@+id/LinearViewa"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_weight=".1"
    android:orientation="vertical" >

</LinearLayout>

为水平列表视图创建一个单独的XML，您可以多次创建并在horiz_listview.xml或类似的东西中动态添加到LinearLayout。您可以使用类型名称设置自己的自定义布局作为TextView标头等：

<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content">

<!-- Add type name here if you like-->

    <com.devsmart.android.ui.HorizontalListView
        android:id="@+id/hlistview1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="#000000" />

</LinearLayout>

然后在您的活动中，获取包含所有ArrayLists的大量哈希映射并迭代它，为每个ArrayLists创建一个Horizo​​ntalListView并将其添加到LinearLayout：

LinearLayout layout = (LinearLayout)findViewById(R.id.LinearViewa);
HashMap<String, ArrayList<HashMap<String, String>>> eHash = controller.getAllts();
LayoutInflater inflater = getLayoutInflater();
for(Map.Entry<String, ArrayList<HashMap<String, String>>> entry : eHash.entrySet())
{
    // get the type name and ArrayList of Hashmaps for this type:
    String typename = entry.getKey();
    ArrayList<HashMap<String, String>> eList = entry.getValue();

    // inflate a horizonal list view and add it to the layout:
    View view = inflater.inflate(R.layout.horiz_listview, null, false);
    layout.addView(view);

    // set up the horizontal list view like before:
    HorizontalListView hListView = (HorizontalListView) view.findViewById(R.id.hlistview1);
    ListAdapter adapter = new SimpleAdapter(Su.this,eList,R.layout.view_m_ts, images, ins);
    hListView.setAdapter(adapter);
}

如果您有更多的Horizo​​ntalListViews可以放在屏幕上，那么您可能需要将主LinearLayout包装在ScrollView中，但是请注意，您可能会遇到麻烦，请参阅this question。