在NavigationViews之间添加分隔符

Question

我需要在我的应用中的两个NavigationView之间添加一个分隔符。 （c3.xlarge和navigation_drawer_top）。

我试过这个。但这增加了分隔线到视图的顶部。不在第一个NavigationView（navigation_drawer_bottom）的末尾。

navigation_drawer_top

这是我的代码

<View android:layout_width="match_parent"
          android:layout_height="1dp"
          android:background="?android:attr/listDivider"/>

Answer 1

这很简单。您需要做的就是创建一个组并将唯一ID添加到组。唯一ID是在菜单中添加分隔符的真正技巧。

以下是一个快速举例，

<group android:id="@+id/group1" android:checkableBehavior="single" >
    <item
        android:id="@+id/item_1"
        android:checked="true"
        android:icon="@drawable/ic_1"
        android:title="@string/title_1" />
</group>

<group android:id="@+id/group2" android:checkableBehavior="single" >
    <item
        android:id="@+id/item_2"
        android:icon="@drawable/ic_2"
        android:title="@string/title_2" />
</group>

这肯定会在您的菜单中添加分隔符。

修改 在以编程方式添加菜单时，您应该尝试访问每个NavigationMenuView并向其添加装饰器。

NavigationView navigationView = (NavigationView) findViewById(R.id.navigation);
NavigationMenuView navMenuView = (NavigationMenuView) navigationView.getChildAt(0);
navMenuView.addItemDecoration(new DividerItemDecoration(appContext,DividerItemDecoration.VERTICAL_LIST))

这是你的DividerItemDecoration课程，

public class DividerItemDecoration extends RecyclerView.ItemDecoration {

    private static final int[] ATTRS = new int[]{
            android.R.attr.listDivider
    };

    public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;

    public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;

    private Drawable mDivider;

    private int mOrientation;

    public DividerItemDecoration(Context context, int orientation) {
        final TypedArray a = context.obtainStyledAttributes(ATTRS);
        mDivider = a.getDrawable(0);
        a.recycle();
        setOrientation(orientation);
    }

    public void setOrientation(int orientation) {
        if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST) {
            throw new IllegalArgumentException("invalid orientation");
        }
        mOrientation = orientation;
    }

    @Override
    public void onDraw(Canvas c, RecyclerView parent) {
        if (mOrientation == VERTICAL_LIST) {
            drawVertical(c, parent);
        } else {
            drawHorizontal(c, parent);
        }
    }

    public void drawVertical(Canvas c, RecyclerView parent) {
        final int left = parent.getPaddingLeft();
        final int right = parent.getWidth() - parent.getPaddingRight();

        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            final View child = parent.getChildAt(i);
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                    .getLayoutParams();
            final int top = child.getBottom() + params.bottomMargin;
            final int bottom = top + mDivider.getIntrinsicHeight();
            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(c);
        }
    }

    public void drawHorizontal(Canvas c, RecyclerView parent) {
        final int top = parent.getPaddingTop();
        final int bottom = parent.getHeight() - parent.getPaddingBottom();

        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            final View child = parent.getChildAt(i);
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                    .getLayoutParams();
            final int left = child.getRight() + params.rightMargin;
            final int right = left + mDivider.getIntrinsicHeight();
            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(c);
        }
    }

    @Override
    public void getItemOffsets(Rect outRect, int itemPosition, RecyclerView parent) {
        if (mOrientation == VERTICAL_LIST) {
            outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
        } else {
            outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
        }
    }
}

Answer 2

试试这个

<View
android:layout_below="@+id/id_of_item_below_which_you_want_it"
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="?android:attr/listDivider"/>