突出显示可扩展列表视图上的所有选定项目
问题描述:
我试图突出显示expandablelistview中的一个或多个项目。我找到了很多解决方案,但没有任何可以帮助我。 我希望有人能帮助我。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。鸡尾酒的成分应该由用户在可扩展列表视图中选择。我只能同时突出显示一个项目。但为了更好的用户体验,用户可以选择多个项目很重要。如果他选择了所有成分,他可以保存他的选择,活动将关闭。如果他忘记了一种成分,那么他可以再次开始活动,他会看到所有突出显示的项目,他已经选择并选择了被遗忘的项目。突出显示可扩展列表视图上的所有选定项目
我希望,我的英语不是很糟糕,你可以理解我的意思并帮助我。
这里是将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;
}
}
而这里xml-files:
<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:我发现我的问题的解决方案。感谢帮助。 :)
答
你可以设置背景颜色为选定的子视图
v.setBackgroundColor(Color.parseColor("#4482e5"));
谢谢您的回答。但是,如果用户选择了错误的成分,那又是什么?我已经尝试过这种方式,但我无法再将颜色更改为标准颜色。我用setSelected尝试了这一点,但它不起作用。我只能突出一个或多个项目。但取消选择不起作用...任何想法,我怎么能做到这一点? – maddy