Question

我正在尝试突出显示expandablelistview中的一个或多个项目。我发现了许多解决方案，但没有什么可以帮助我。我希望，有人可以帮助我。我有一个鸡尾酒数据库。在应用程序中，您可以创建一个新的鸡尾酒。用户应在expandablelistview中选择鸡尾酒的成分。我只能同时突出显示一个项目。但是为了更好的用户体验，用户可以选择多个项目非常重要。如果他选择了所有成分，他可以保存他的选择，活动将关闭。如果他忘记了一个成分，那么他可以再次开始活动，他会看到所有项目突出显示，他刚刚选择并选择了被遗忘的项目。

我希望，我的英语不是那么糟糕，你可以理解我的意思并帮助我。

以下是开始选择鸡尾酒配料的活动：

public class SelectIngredientByCategory extends AppCompatActivity {
private ExpandableListView ingredients;
private ExpandableListAdapter listAdapter;
private List<String> listDataHeader;
private HashMap<String, List<String>> listDataChild;
private DBConnection db;

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

    db = new DBConnection(getApplication());

   /* ... */

    ingredients = (ExpandableListView) findViewById(R.id.elvIngredientsByCategory);
    prepareListData();
    listAdapter = new ExpandableListAdapter(getApplication(), listDataHeader, listDataChild);

    ingredients.setAdapter(listAdapter);
    ingredients.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
        @Override
        public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
            String ingredientName = (String) listAdapter.getChild(groupPosition, childPosition);

            /* ... */

           /* 
           * if item is selected
           * mark item blue
           * if not
           * mark item red
           */

            return false;
        }
    });
}

public void prepareListData() {
    listDataHeader = new ArrayList<String>(); //category
    listDataChild = new HashMap<String, List<String>>(); //ingredient

    listDataHeader = db.getAllCategoryIngredientsName();

    List<String> tmp;

    for (int i = 0; i < listDataHeader.size(); i++) { 
        tmp = db.getAllIngredientByCategory(listDataHeader.get(i));
        listDataChild.put(listDataHeader.get(i), tmp);
    }
}

/* ... */

}

这是我的适配器：

public class ExpandableListAdapter extends BaseExpandableListAdapter {

private Context _context;
private List<String> category;
private HashMap<String, List<String>> ingredient;

public ExpandableListAdapter(Context context, List<String> category,
                             HashMap<String, List<String>> ingredient) {
    this._context = context;
    this.category = category;
    this.ingredient = ingredient;
}

@Override
public Object getChild(int groupPosition, int childPosititon) {
    return this.ingredient.get(this.category.get(groupPosition))
            .get(childPosititon);
}

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

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

    if (convertView == null) {
        LayoutInflater infalInflater = (LayoutInflater) this._context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = infalInflater.inflate(R.layout.exp_list_item, null);
    }

    final String childText = (String) getChild(groupPosition, childPosition);

    TextView child = (TextView) convertView
            .findViewById(R.id.lblListChild);
    child.setText(childText);

    return convertView;
}

@Override
public int getChildrenCount(int groupPosition) {
    return this.ingredient.get(this.category.get(groupPosition))
            .size();
}

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

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

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

@Override
public View getGroupView(final int groupPosition, boolean isExpanded,
                         View convertView, ViewGroup parent) {
    if (convertView == null) {
        LayoutInflater infalInflater = (LayoutInflater) this._context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = infalInflater.inflate(R.layout.exp_list_group, null);
    }

    String headerTitle = (String) getGroup(groupPosition);

    final TextView lblListHeader = (TextView) convertView
            .findViewById(R.id.lblListHeader);
    lblListHeader.setTypeface(null, Typeface.BOLD);
    lblListHeader.setText(headerTitle);

    return convertView;
}

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

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

}

这里是xml文件：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".Ingredient.SelectIngredientByCategory"
android:orientation="vertical">

<ExpandableListView
    android:id="@+id/elvIngredientsByCategory"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:divider="#b5b5b5"
    android:dividerHeight="1dp"
    android:padding="1dp"
    android:choiceMode="multipleChoice"/>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" 
android:layout_width="match_parent"
android:layout_height="match_parent">

<TextView
    android:id="@+id/lblListHeader"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textSize="17dp"
    android:textColor="#000000"/>

</LinearLayout>

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">

<TextView
    android:id="@+id/lblListChild"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textSize="17dp"/>

</LinearLayout>

编辑：我找到了解决问题的方法。感谢帮助。：）

Answer 1

您可以为所选子视图设置背景颜色

v.setBackgroundColor(Color.parseColor("#4482e5"));

突出显示expandablelistview上的所有选定项目

1 个答案: