Android 如何在BottomNavigationView中设置所选项目
我试图在创建的活动上设置默认项,但它不起作用? 这是我的代码:Android 如何在BottomNavigationView中设置所选项目,android,bottomnavigationview,Android,Bottomnavigationview,我试图在创建的活动上设置默认项,但它不起作用? 这是我的代码: protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_userhome); mTextMessage = (TextView) findViewById(R.id.message); profile = (Fram
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_userhome);
mTextMessage = (TextView) findViewById(R.id.message);
profile = (FrameLayout) findViewById(R.id.profile);
mall = (FrameLayout) findViewById(R.id.mall);
dietplan =(FrameLayout) findViewById(R.id.dietplan);
BottomNavigationView navigation = (BottomNavigationView)
findViewById(R.id.navigation);
navigation.setSelectedItemId(R.id.dietplan);
navigation.setOnNavigationItemSelectedListener
(mOnNavigationItemSelectedListener);
}
但似乎navigation.setSelectedItemId(R.id.dietplan)代码>不工作。请帮助我设置底部导航栏的默认项:
这是我的堆栈跟踪(logcat):
您需要setChecked(true)
。试试这个代码
mBottomNavigationView=(BottomNavigationView)findViewById(R.id.bottom_nav);
mBottomNavigationView.getMenu().findItem(R.id.item_id).setChecked(true);
选中的项目在底部导航视图中突出显示
只需共享我的工作源代码即可
在Xml中
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.BottomNavigationView
android:background="@color/colorWhite"
android:id="@+id/gfPrlBnvBtmView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="start"
android:layout_alignParentBottom="true"
app:menu="@menu/bottom_navigation_main" />
</LinearLayout>
在爪哇
public class TestActivity extends AppCompatActivity implements BottomNavigationView.OnNavigationItemSelectedListener
{
private BottomNavigationView mBtmView;
private int mMenuId;
@Override
public void onCreate(@Nullable Bundle savedInstanceState, @Nullable PersistableBundle persistentState) {
super.onCreate(savedInstanceState, persistentState);
setContentView(R.layout.test);
mBtmView = (BottomNavigationView) findViewById(R.id.gfPrlBnvBtmView);
mBtmView.setOnNavigationItemSelectedListener(this);
mBtmView.getMenu().findItem(R.id.action_yoga).setChecked(true);
}
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
// uncheck the other items.
mMenuId = item.getItemId();
for (int i = 0; i < mBtmView.getMenu().size(); i++) {
MenuItem menuItem = mBtmView.getMenu().getItem(i);
boolean isChecked = menuItem.getItemId() == item.getItemId();
menuItem.setChecked(isChecked);
}
switch (item.getItemId()) {
case R.id.action_food: {
}
break;
case R.id.action_medical: {
}
break;
case R.id.action_yoga: {
}
break;
case R.id.action_postures: {
}
break;
}
return true;
}
}
公共类测试活动扩展了AppCompative活动实现了BottomNavigationView.OnNavigationItemSelectedListener
{
私有底部导航视图mBtmView;
私有内码;
@凌驾
创建时的公共void(@Nullable Bundle savedInstanceState,@Nullable persistable Bundle persistentState){
super.onCreate(savedInstanceState、persistentState);
setContentView(R.layout.test);
mBtmView=(底部导航视图)findViewById(R.id.gfPrlBnvBtmView);
mBtmView.setOnNavigationItemSelectedListener(此);
mBtmView.getMenu().findItem(R.id.action_yoga).setChecked(true);
}
@凌驾
公共布尔值onNavigationItemSelected(@NonNull MenuItem item){
//取消选中其他项目。
mMenuId=item.getItemId();
对于(int i=0;i
这对我很有用
活动布局:
<android.support.design.widget.BottomNavigationView
android:id="@+id/bottomNavigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:itemBackground="@color/colorPrimary"
app:itemIconTint="@color/tabs"
app:itemTextColor="@color/tabs"
app:menu="@menu/bottom_navigation_main" />
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:color="@color/not_active" android:state_checked="false"/>
<item android:color="@color/active" android:state_checked="true"/>
</selector>
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.action_tab0:
setFragment(f0);
break;
case R.id.action_tab1:
setFragment(f1);
break;
}
return true; // not false!
}
Kotlin扩展版的答案:
这不会触发OnNavigationItemSelectedListener的,
您还可以使用如下索引在BottomNavigationView中设置选择:
public void selectBottomNavigationOption(int index) {
switch (index) {
case 0:
index = R.id.action_1;
break;
case 1:
index = R.id.action_2;
break;
case 2:
index = R.id.action_3;
break;
case 3:
index = R.id.action_4;
break;
}
bottomNavigationView.setSelectedItemId(index);
}
将android:enabled=“true”
添加到底部导航菜单项
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="@+id/menu_id"
android:enabled="true"
android:icon="@drawable/ic_my_icon"
android:title="@string/menu_title"/>
</menu>
在onCreate()
方法中,
通过设置侦听器
bottomNavigationView.setOnNavigationItemSelectedListener(MLListener)
并通过执行bottomNavigationView.selectedItemId=R.id.menu\u id
设置要选择的项目
每当创建活动时,这将从
NavigationItemSelectedListener
触发onNavigationItemSelected()
。如果希望在视图中忽略已单击的元素,而不是将其返回为“selected”,则在处理单击后可以返回false,在某些情况下和某些设计中,您可能需要打开一个活动而不是片段,这将在活动关闭后使选定项成为底部项目
private val onNavigationItemSelectedListener = BottomNavigationView.OnNavigationItemSelectedListener { item ->
when (item.itemId) {
R.id.navigation_shipment -> {
currentItem = TAB_INDEX_SHIPMENT
val intent = Intent(this, BookShipmentActivity::class.java)
startActivity(intent)
return@OnNavigationItemSelectedListener false
}
}
false
}
您可以使用:
navigationView?.menu?.findItem(drawableMenuItem.id)?.isChecked = true
并且它不会在NavigationItemSelectedListener上触发
事件。仅供参考:对于片段,onCreateView
BottomNavigationView mBottomNavigationView = getActivity().findViewById(R.id.bottomNavigationView);
mBottomNavigationView.setSelectedItemId(R.id.your_item);
有两个塞纳里奥
设置所选菜单项ID。其行为与点击某个项目相同
代码示例:
BottomNavigationView bottomNavigationView;
bottomNavigationView = (BottomNavigationView) findViewById(R.id.bottomNavigationView);
bottomNavigationView.setOnNavigationItemSelectedListener(myNavigationItemListener);
bottomNavigationView.setSelectedItemId(R.id.my_menu_item_id);
BottomNavigationView bottomNavigationView= (getActivity()).findViewById(R.id.bottom_navigation);
bottomNavigationView.getMenu().findItem(R.id.action_manage_orders_id).setChecked(true);
我想你只需要检查一下就可以了
代码示例:
BottomNavigationView bottomNavigationView;
bottomNavigationView = (BottomNavigationView) findViewById(R.id.bottomNavigationView);
bottomNavigationView.setOnNavigationItemSelectedListener(myNavigationItemListener);
bottomNavigationView.setSelectedItemId(R.id.my_menu_item_id);
BottomNavigationView bottomNavigationView= (getActivity()).findViewById(R.id.bottom_navigation);
bottomNavigationView.getMenu().findItem(R.id.action_manage_orders_id).setChecked(true);
科特林溶液
断断续续
getActivity()?.myNavigationViewId?.selectedItemId = R.id.other_tab_id
在活动中
myNavigationViewId?.selectedItemId = R.id.other_tab_id
注意:确保用实际的导航视图和选项卡id替换myNavigationViewId
和其他选项卡id
含碎片的Kotlin溶液
var fragment = Fragment()
bottomNav = findViewById(R.id.bottom_nav)
bottomNav.setOnNavigationItemSelectedListener { item ->
when (item.itemId) {
R.id.home -> {
fragment = HomeForm()
}
R.id.score -> {
fragment = ScoreForm()
}
}
supportFragmentManager
.beginTransaction()
.replace(R.id.frame_layout, fragment)
.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN)
.commit()
true
}
bottomNav.selectedItemId = R.id.score // init open score tab
对我来说,setSelectedItemId(intid)
仅显示片段,但所选菜单项仍然是错误的
我发现在BottomNavigationView
都设置好之后调用setSelectedItemId(intid)
是不够的
我停止在onCreate(savedInstanceState:Bundle?
中调用setSelectedItemId(int-id)
,而是开始在onResume()中调用它。这解决了问题。我在navigation.getMenu().findItem(R.id.dietplan)。setChecked(true)之前尝试过这个方法;但它会给出NullPointerException,首先初始化底部导航,然后查找菜单。。它的工作代码。。。我尝试了此方法如何更改选中项的颜色?@AlanNelson检查此说明此方法仅突出显示该项,但不单击它。如果有人投票反对,请解释为什么只有我更改答案,谢谢您为什么选中所有菜单?您可以这样做item.setChecked(true)很遗憾,没人知道为什么…谢谢你!我一直得到一个NPE。我需要你的getActivity()
来执行findViewById(R.id.bottom\u nav)
,因为我是从一个片段执行的。非常感谢。