如何以编程方式更改底部导航视图的图标？

问题描述：

我想知道如何在用户基本选择底部导航视图的图标时对其进行更改，如果用户选择其他选项，则再次将其替换为上一个图标。

I want know how can I change Bottom Navigation View's Icons when user basically selects it and then again replace it with previous icon if user selects different option.

下面是我的开关盒摘要。

Below is my switch case snippet.

开关（menuItem.getItemId（））{

switch (menuItem.getItemId()) {

            case R.id.ic_home:

                selectedFragment = new HomeFragment();

                //menuItem.setIcon(R.drawable.like_colored);

                break;

            case R.id.ic_connect:

                selectedFragment = new ConnectionFragment();

                break;

            case R.id.ic_add:

                selectedFragment = new AddPostFragment();

                break;

            case R.id.ic_noti:

                selectedFragment = new NotificationFragment();

                break;

            case R.id.ic_profile:

                selectedFragment = new ProfileFragment();

                break;

答

如果要通过编程方式设置将所有菜单项转换为switch语句之前的默认图标。

If you want to do it programmatically do it by setting all menu items to default icons before the switch statement.

navigation.getMenu().getItem(0).setIcon(R.drawable.defaultIcon1);
navigation.getMenu().getItem(1).setIcon(R.drawable.defaultIcon2);
navigation.getMenu().getItem(2).setIcon(R.drawable.defaultIcon3);
navigation.getMenu().getItem(3).setIcon(R.drawable.defaultIcon4);
navigation.getMenu().getItem(4).setIcon(R.drawable.defaultIcon5);
switch (menuItem.getItemId()) {
      case R.id.ic_home:
                selectedFragment = new HomeFragment();
                menuItem.setIcon(R.drawable.icon1);
                break;
      case R.id.ic_connect:
                selectedFragment = new ConnectionFragment();
                menuItem.setIcon(R.drawable.icon2);
                break;
      case R.id.ic_add:
                selectedFragment = new AddPostFragment();
                menuItem.setIcon(R.drawable.icon3);
                break;
      case R.id.ic_noti:
                selectedFragment = new NotificationFragment();
                menuItem.setIcon(R.drawable.icon4);
                break;
      case R.id.ic_profile:
                selectedFragment = new ProfileFragment();
                menuItem.setIcon(R.drawable.icon5);
                break;
}

或
您可以通过编辑XML文件来代替

Or You could do it by editing XML files instead of doing programmatically.

drawable / homeIconSelector.xml

drawable/homeIconSelector.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/homeNormalIcon" android:state_checked="false"/>
    <item android:drawable="@drawable/homeSelectedIcon" android:state_checked="true"/>
</selector>

和您的菜单文件
menu /（menunamehere）.xml

and your menu file menu/(menunamehere).xml

<item
android:id="@+id/navigation_home"
android:icon="@drawable/homeIconSelector"
android:title="@string/title_child" />

如何以编程方式更改底部导航视图的图标？

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