突出顯示可擴展列表視圖上的所有選定項目

Question

我試圖突出顯示expandablelistview中的一個或多個項目。我找到了很多解決方案，但沒有任何可以幫助我。 我希望有人能幫助我。我有一個雞尾酒數據庫。在應用程序中，您可以創建一個新的雞尾酒。雞尾酒的成分應該由用戶在可擴展列表視圖中選擇。我只能同時突出顯示一個項目。但爲了更好的用戶體驗，用戶可以選擇多個項目很重要。如果他選擇了所有成分，他可以保存他的選擇，活動將關閉。如果他忘記了一種成分，那麼他可以再次開始活動，他會看到所有突出顯示的項目，他已經選擇並選擇了被遺忘的項目。

我希望，我的英語不是很糟糕，你可以理解我的意思並幫助我。

這裏是將開始選擇雞尾酒配料的活動：

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); 
    } 
} 

/* ... */ 

}

這是我的適配器：

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; 
} 

}

而這裏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> 

編輯：我發現我的問題的解決方案。感謝幫助。 :)

Answer 1

你可以設置背景顏色爲選定的子視圖

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