BottomNavigationView-如何取消选中所有MenuItems并保持标题显示?

问题描述

当我喜欢BottomNavigationView中的设计时，我决定使用它为我的App实现一个新菜单，而不仅仅是使用简单的按钮.

As I liked the design from BottomNavigationView I decided to implement a new Menu for my App with it, instead of just using simple buttons.

我以这篇帖子为指南.

根据BottomNavigationView的文档 ，其目的是

就我而言，我只希望每个MenuItem都启动一个活动，但是默认情况下始终选择一个MenuItem:

In my case, I just want each MenuItem to launch an activity, but by default there is always one MenuItem selected:

我尝试通过以下方式将颜色设置为白色:

I tried to set the color to white with:

app:itemIconTint="@color/white"
app:itemTextColor="@color/white"

仍然可见，选择的MenuItem与其他(标题大小较大)不同，这仍然困扰着我:

Still, visibly selected MenuItem is different from others (Title size bigger), which is still bothering me:

我想到了放置一个隐藏的MenuItem以便进行选择的方法:

I came with the idea to place a hidden MenuItem to select like:

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

并使其显示为GONE:

 bottomNavigationView.getMenu().findItem(R.id.uncheckedItem).setChecked(true);
 bottomNavigationView.findViewById(R.id.uncheckedItem).setVisibility(View.GONE);

这将使所有MenuItems都未选中，但是默认情况下BottomNavigationView隐藏标题，因为即使第四个MenuItem设置为GONE，它也要显示3个以上的MenuItems:

This makes all MenuItems unchecked, but by default BottomNavigationView is hidding Titles, as it has more than 3 MenuItems to display, even if the fourth MenuItem is settle to GONE:

所以我的问题仍然存在，是否存在取消/取消选择所有MenuItems并使标题保持显示的行为?

So my question remains, is there away/hack to unselect all MenuItems and keep its titles being displayed?

推荐答案

我找到了自己的解决方案，将我的进步与帖子.

I found my own solution merging my progress with this post.

步骤:

1. 更新proguard-rules.pro并同步构建
2. 创建帮助器以禁用BottomNavigationView Shift模式
3. 创建要隐藏在Menu.xml上的项目
4. 膨胀BottomNavigationView
5. 将商品"设置为已检查的已消失"
6. 使用帮助器禁用换档模式

输出:

工作代码:

proguard-rules.pro:

-keepclassmembers class android.support.design.internal.BottomNavigationMenuView {
    boolean mShiftingMode;
}

BottomNavigationShiftHelper.java:

public class BottomNavigationShiftHelper {

    private final static String TAG = "DEBUG_BOTTOM_NAV_UTIL";

    public static void disableShiftMode(BottomNavigationView view) {
        BottomNavigationMenuView menuView = (BottomNavigationMenuView) view.getChildAt(0);
        try {
            Field shiftingMode = menuView.getClass().getDeclaredField("mShiftingMode");
            shiftingMode.setAccessible(true);
            shiftingMode.setBoolean(menuView, false);
            shiftingMode.setAccessible(false);
            for (int i = 0; i < menuView.getChildCount(); i++) {
                BottomNavigationItemView item = (BottomNavigationItemView) menuView.getChildAt(i);
                item.setShiftingMode(false);
                // set once again checked value, so view will be updated
                item.setChecked(item.getItemData().isChecked());
            }
        } catch (NoSuchFieldException e) {
            Log.d(TAG, "Unable to get shift mode field");
        } catch (IllegalAccessException e) {
            Log.d(TAG, "Unable to change value of shift mode");
        }
    }
}

活动Sample.java:

 private void loadNavigationBar() {
        BottomNavigationView bottomNavigationView = (BottomNavigationView)
                findViewById(R.id.navigation_bar);

        bottomNavigationView.getMenu().findItem(R.id.uncheckedItem).setChecked(true);
        bottomNavigationView.findViewById(R.id.uncheckedItem).setVisibility(View.GONE);

        BottomNavigationViewUtils.disableShiftMode(bottomNavigationView);

        bottomNavigationView.setOnNavigationItemSelectedListener(
                new BottomNavigationView.OnNavigationItemSelectedListener() {
                    @Override
                    public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                        switch (item.getItemId()) {
                            case R.id.newList:
                                //Do The Math
                                break;
                            case R.id.loadList:
                                //Do The Math
                                break;
                            case R.id.settings:
                                //Do The Math
                                break;
                        }
                        return false;
                    }
                });
    }

BottomNavigationMenu.xml:

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/newList"
        android:enabled="true"
        android:icon="@drawable/new_list"
        android:title="@string/common.button.list.new"
        app:showAsAction="withText" />
    <item
        android:id="@+id/loadList"
        android:enabled="true"
        android:icon="@drawable/load"
        android:title="@string/common.button.list.load"
        app:showAsAction="withText" />
    <item
        android:id="@+id/settings"
        android:enabled="true"
        android:icon="@drawable/settings"
        android:title="@string/common.label.settings"
        app:showAsAction="withText" />
    <item
        android:id="@+id/uncheckedItem"
        android:title="" />
</menu>

BottomNavigationComponent(在Activity.xml内部):

<android.support.design.widget.BottomNavigationView
    android:id="@+id/navigation_bar"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    app:itemIconTint="@color/white"
    app:itemTextColor="@color/white"
    android:background="@drawable/BottomNavigationMenu.xml"
    app:menu="@menu/supercart_bottom_navigation" />

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