android导航 View 菜单项之前(左侧)的空白空间

Question

我正在使用导航 View 修改 Android 应用程序。对于前几个菜单项，我给出了一个图标，但之后，我只给出了菜单标题。但是在导航面板中，没有图标的菜单项有一个空白区域。

如何删除空白区域？我希望菜单项在没有空格的情况下开始。

这是我的 main_activity.xml 代码:

<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true">

    <include
        layout="@layout/activity_category"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

    <android.support.design.widget.NavigationView
        android:id="@+id/nav_view"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        app:headerLayout="@layout/nav_header_main"
        app:menu="@menu/activity_main_drawer">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="60dp"
            android:text="Emoji icons provided free by EmojiOne(www.emojione.com)"
            android:background="#424242"
            android:textColor="@android:color/white"
            android:textSize="12dp"
            android:layout_gravity="bottom"
            android:gravity="center"/>

    </android.support.design.widget.NavigationView>

</android.support.v4.widget.DrawerLayout>

这是我的 activity_main_drawer.xml 代码:

<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <group
        android:checkableBehavior="single">

    <item
        android:id="@+id/numbers_menu_item"
        android:icon="@drawable/numbers"
        android:title="Numbers" />

    <item
        android:id="@+id/family_menu_item"
        android:icon="@drawable/family"
        android:title="Family"/>

    <item
        android:id="@+id/colors_menu_item"
        android:icon="@drawable/colors"
        android:title="Colors"/>

    <item
        android:id="@+id/animals_menu_item"
        android:icon="@drawable/animals"
        android:title="Animals"/>
    <item
        android:id="@+id/food_menu_item"
        android:icon="@drawable/coconut"
        android:title="Food"/>

    <item
        android:id="@+id/pronoun_menu_item"
        android:title="Pronouns" />

    <item
        android:id="@+id/pronoun_examples_menu_item"
        android:title="Pronoun Examples"/>

    <item
        android:id="@+id/greetings_menu_item"
        android:title="Greetings"/>

    <item
        android:id="@+id/introductions_menu_item"
        android:title="Introductions"/>

    <item
        android:id="@+id/vendors_menu_item"
        android:title="Talking with vendors"/>

    <item
        android:id="@+id/directions_menu_item"
        android:title="Asking for directions"/>

    <item
        android:id="@+id/colleagues_menu_item"
        android:title="Talking with colleagues"/>

    <item
        android:id="@+id/taxi_driver_menu_item"
        android:title="Talking with taxi driver"/>

    <item
        android:id="@+id/questioning_words_menu_item"
        android:title="Questioning Words"/>


    </group>

    <item android:title="Empty category"/>


</menu>

编辑:尝试将所有没有图标的菜单项分组到一个组中。仍然没有用。代码:

<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <group
        android:checkableBehavior="single">
    <item
        android:id="@+id/numbers_menu_item"
        android:icon="@drawable/numbers"
        android:title="Numbers" />

    <item
        android:id="@+id/family_menu_item"
        android:icon="@drawable/family"
        android:title="Family"/>

    <item
        android:id="@+id/colors_menu_item"
        android:icon="@drawable/colors"
        android:title="Colors"/>

    <item
        android:id="@+id/animals_menu_item"
        android:icon="@drawable/animals"
        android:title="Animals"/>
    <item
        android:id="@+id/food_menu_item"
        android:icon="@drawable/coconut"
        android:title="Food"/>
    </group>
    <group
        android:checkableBehavior="single">
    <item
        android:id="@+id/pronoun_menu_item"
        android:title="Pronouns" />

    <item
        android:id="@+id/pronoun_examples_menu_item"
        android:title="Pronoun Examples"/>

    <item
        android:id="@+id/greetings_menu_item"
        android:title="Greetings"/>

    <item
        android:id="@+id/introductions_menu_item"
        android:title="Introductions"/>

    <item
        android:id="@+id/vendors_menu_item"
        android:title="Talking with vendors"/>

    <item
        android:id="@+id/directions_menu_item"
        android:title="Asking for directions"/>

    <item
        android:id="@+id/colleagues_menu_item"
        android:title="Talking with colleagues"/>

    <item
        android:id="@+id/taxi_driver_menu_item"
        android:title="Talking with taxi driver"/>

    <item
        android:id="@+id/phone_menu_item"
        android:title="Talking in phone"/>

    <item
        android:id="@+id/questioning_words_menu_item"
        android:title="Questioning Words"/>

    <item android:title="Empty category"/>
    </group>

</menu>

Answer 1

从 NavigationMenuItemView 和 NavigationMenuPresenter 源代码来看，如果组有图标或任何菜单项有图标，它将添加空图标。因此，按照建议，您需要将所有文本菜单分组到一个没有图标的单独组中。您必须为每个组指定不同的组 ID。

 private void prepareMenuItems() {
        if (mUpdateSuspended) {
            return;
        }
        mUpdateSuspended = true;
        mItems.clear();
        mItems.add(new NavigationMenuHeaderItem());

        int currentGroupId = -1;
        int currentGroupStart = 0;
        boolean currentGroupHasIcon = false;
        for (int i = 0, totalSize = mMenu.getVisibleItems().size(); i < totalSize; i++) {
            MenuItemImpl item = mMenu.getVisibleItems().get(i);
            if (item.isChecked()) {
                setCheckedItem(item);
            }
            if (item.isCheckable()) {
                item.setExclusiveCheckable(false);
            }
            if (item.hasSubMenu()) {
                SubMenu subMenu = item.getSubMenu();
                if (subMenu.hasVisibleItems()) {
                    if (i != 0) {
                        mItems.add(new NavigationMenuSeparatorItem(mPaddingSeparator, 0));
                    }
                    mItems.add(new NavigationMenuTextItem(item));
                    boolean subMenuHasIcon = false;
                    int subMenuStart = mItems.size();
                    for (int j = 0, size = subMenu.size(); j < size; j++) {
                        MenuItemImpl subMenuItem = (MenuItemImpl) subMenu.getItem(j);
                        if (subMenuItem.isVisible()) {
                            if (!subMenuHasIcon && subMenuItem.getIcon() != null) {
                                subMenuHasIcon = true;
                            }
                            if (subMenuItem.isCheckable()) {
                                subMenuItem.setExclusiveCheckable(false);
                            }
                            if (item.isChecked()) {
                                setCheckedItem(item);
                            }
                            mItems.add(new NavigationMenuTextItem(subMenuItem));
                        }
                    }
                    if (subMenuHasIcon) {
                        appendTransparentIconIfMissing(subMenuStart, mItems.size());
                    }
                }
            } else {
                int groupId = item.getGroupId();
                if (groupId != currentGroupId) { // first item in group
                    currentGroupStart = mItems.size();
                    currentGroupHasIcon = item.getIcon() != null;
                    if (i != 0) {
                        currentGroupStart++;
                        mItems.add(new NavigationMenuSeparatorItem(
                                mPaddingSeparator, mPaddingSeparator));
                    }
                } else if (!currentGroupHasIcon && item.getIcon() != null) {
                    currentGroupHasIcon = true;
                    appendTransparentIconIfMissing(currentGroupStart, mItems.size());
                }
                NavigationMenuTextItem textItem = new NavigationMenuTextItem(item);
                textItem.needsEmptyIcon = currentGroupHasIcon;
                mItems.add(textItem);
                currentGroupId = groupId;
            }
        }
        mUpdateSuspended = false;
    }