我想知道当用户基本选择它时如何更改底部导航视图的图标,然后如果用户选择不同的选项,则再次用之前的图标替换它。
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;
如果要以编程方式执行此操作,请在switch语句之前将所有菜单项设置为默认图标。
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;
}
或者您可以通过编辑XML文件而不是以编程方式执行此操作。
绘制/ 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>
和你的菜单文件菜单/(menunamehere).xml
<item
android:id="@+id/navigation_home"
android:icon="@drawable/homeIconSelector"
android:title="@string/title_child" />
这将从任何地方(例如onResume)更改单个菜单项的图标和文本颜色。以下代码适用于4.4.2至(至少)Pie。这是来自这里和其他类似线程的点点滴滴。一些说明:
static public void setMenuItemProperties(AppCompatActivity activity,
MenuItem item,
int resIconDrawable, int resColor) {
int id = item.getItemId();
BottomNavigationItemView m = activity.findViewById(id);
TextView t1 = m.findViewById(R.id.smallLabel);
TextView t2 = m.findViewById(R.id.largeLabel);
t1.setTextColor(activity.getResources().getColor(resColor));
t2.setTextColor(activity.getResources().getColor(resColor));
Drawable d = VectorDrawableCompat.create(activity.getResources(), resIconDrawable, null);
//Drawable d = activity.getResources().getDrawable(resIconDrawable);
item.setIcon(d);
}
像这样调用(来自Activity)在菜单项3的两个图标和文本颜色之间进行选择。(navigation
是BottomNavigationView。)
setMenuItemProperties(this, navigation.getMenu().getItem(3),
enabled ? R.drawable.ic_settings_red_24dp : R.drawable.ic_settings_redish_24dp,
enabled ? android.R.color.white : R.color.medium_dark_grey);