Android BottomNavigationView菜单项集选中不';我不能正常工作
在我的bottomNavigationView中,我可以更改我的菜单项的所有看起来有效的内容,但事实上,我的布局不同于是否选中或是否直接单击选项卡。请看下面的差异: 1) 对于Android BottomNavigationView菜单项集选中不';我不能正常工作,android,menuitem,navigationbar,Android,Menuitem,Navigationbar,在我的bottomNavigationView中,我可以更改我的菜单项的所有看起来有效的内容,但事实上,我的布局不同于是否选中或是否直接单击选项卡。请看下面的差异: 1) 对于menuItem.setChecked(true): 2) 当用户直接单击图标时,它将执行动画并在正确的屏幕上显示动画 我真正想要的是像用户单击一样选择菜单项。不应该通过执行menuItem.setChecked(true)来工作吗 请考虑以下菜单项的定义布局: <item android:id="@+id/me
menuItem.setChecked(true)
:
2) 当用户直接单击图标时,它将执行动画并在正确的屏幕上显示动画
我真正想要的是像用户单击一样选择菜单项。不应该通过执行menuItem.setChecked(true)来工作吗
请考虑以下菜单项的定义布局:
<item android:id="@+id/menu_home"
android:title="@string/menu_home"
android:icon="@drawable/ic_home_black_24dp"
app:showAsAction="ifRoom" />
<item android:id="@+id/menu_hall_of_fame"
android:title="@string/menu_hall_of_fame"
android:icon="@drawable/ic_stars_black_24dp"
app:showAsAction="ifRoom" />
<item android:id="@+id/menu_info"
android:title="@string/menu_info"
android:icon="@drawable/ic_info_black_24dp"
app:showAsAction="ifRoom" />
<item android:id="@+id/menu_settings"
android:title="@string/menu_settings"
android:icon="@drawable/ic_settings_black_24dp"
app:showAsAction="ifRoom" />
以及我如何检查正确的菜单项:
MenuItem item = mBottomNav.getMenu().findItem(R.id.menu_about);
// update selected item
mSelectedItem = item.getItemId();
// uncheck the other items and select the one.
for (int i = 0; i< mBottomNav.getMenu().size(); i++) {
MenuItem menuItem = mBottomNav.getMenu().getItem(i);
menuItem.setChecked(menuItem.getItemId() == mSelectedItem);
}
MenuItem item=mBottomNav.getMenu().findItem(R.id.menu\u about);
//更新所选项目
mSelectedItem=item.getItemId();
//取消选中其他项目并选择一个。
对于(int i=0;i
是否有另一种方法来执行菜单项的选择?我在这里遗漏了什么?看到我在这里发布的所有代码了吗
public class MainActivity extends AppCompatActivity {
private static final String SELECTED_ITEM = "arg_selected_item";
private BottomNavigationView mBottomNav;
private int mSelectedItem;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mBottomNav = (BottomNavigationView) findViewById(R.id.navigation);
mBottomNav.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
selectFragment(item);
return true;
}
});
MenuItem selectedItem;
if (savedInstanceState != null) {
mSelectedItem = savedInstanceState.getInt(SELECTED_ITEM, 0);
selectedItem = mBottomNav.getMenu().findItem(mSelectedItem);
} else {
selectedItem = mBottomNav.getMenu().getItem(0);
}
selectFragment(selectedItem);
}
@Override
protected void onSaveInstanceState(Bundle outState) {
outState.putInt(SELECTED_ITEM, mSelectedItem);
super.onSaveInstanceState(outState);
}
@Override
public void onBackPressed() {
MenuItem homeItem = mBottomNav.getMenu().getItem(0);
if (mSelectedItem != homeItem.getItemId()) {
// select home item
selectFragment(homeItem);
} else {
super.onBackPressed();
}
}
private void selectFragment(MenuItem item) {
Fragment frag = null;
// init corresponding fragment
switch (item.getItemId()) {
case R.id.menu_home:
frag = MenuFragment.newInstance(getString(R.string.text_home),
getColorFromRes(R.color.color_home));
break;
case R.id.menu_notifications:
frag = MenuFragment.newInstance(getString(R.string.text_notifications),
getColorFromRes(R.color.color_notifications));
break;
case R.id.menu_search:
frag = MenuFragment.newInstance(getString(R.string.text_search),
getColorFromRes(R.color.color_search));
break;
}
// update selected item
mSelectedItem = item.getItemId();
// uncheck the other items.
Menu menu = mBottomNav.getMenu();
for (int i = 0, size = menu.size(); i < size; i++) {
MenuItem menuItem = menu.getItem(i);
((MenuItemImpl) menuItem).setExclusiveCheckable(false);
menuItem.setChecked(menuItem.getItemId() == R.id.menu_home);
((MenuItemImpl) menuItem).setExclusiveCheckable(true);
}
updateToolbarText(item.getTitle());
if (frag != null) {
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.add(R.id.container, frag, frag.getTag());
ft.commit();
}
}
private void updateToolbarText(CharSequence text) {
ActionBar actionBar = getSupportActionBar();
if (actionBar != null) {
actionBar.setTitle(text);
}
}
private int getColorFromRes(@ColorRes int resId) {
return ContextCompat.getColor(this, resId);
}
public类MainActivity扩展了AppCompatActivity{
私有静态最终字符串SELECTED\u ITEM=“arg\u SELECTED\u ITEM”;
私人底部导航视图mBottomNav;
私有内部mSelectedItem;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mBottomNav=(底部导航视图)findViewById(R.id.navigation);
mBottomNav.setOnNavigationItemSelectedListener(新的BottomNavigationView.OnNavigationItemSelectedListener(){
@凌驾
公共布尔值onNavigationItemSelected(@NonNull MenuItem item){
选择片段(项目);
返回true;
}
});
菜单项selectedItem;
如果(savedInstanceState!=null){
mSelectedItem=savedInstanceState.getInt(选定项,0);
selectedItem=mBottomNav.getMenu().findItem(mSelectedItem);
}否则{
选择editem=mBottomNav.getMenu().getItem(0);
}
selectFragment(selectedItem);
}
@凌驾
SaveInstanceState上受保护的无效(束超出状态){
outState.putInt(所选项目,mSelectedItem);
super.onSaveInstanceState(超出状态);
}
@凌驾
public void onBackPressed(){
MenuItem homeItem=mBottomNav.getMenu().getItem(0);
如果(mSelectedItem!=homeItem.getItemId()){
//选择主项目
选择片段(homeItem);
}否则{
super.onBackPressed();
}
}
私有void selectFragment(菜单项){
片段frag=null;
//初始对应片段
开关(item.getItemId()){
案例R.id.menu\U主页:
frag=MenuFragment.newInstance(getString(R.string.text_home),
getColorFromRes(R.color.color_home));
打破
案例R.id.menu通知:
frag=MenuFragment.newInstance(getString(R.string.text_通知),
getColorFromRes(R.color.color_通知);
打破
案例R.id.菜单搜索:
frag=MenuFragment.newInstance(getString(R.string.text_search),
getColorFromRes(R.color.color_search));
打破
}
//更新所选项目
mSelectedItem=item.getItemId();
//取消选中其他项目。
Menu Menu=mBottomNav.getMenu();
对于(inti=0,size=menu.size();i
}
您可以使用此代码
Menu Menu=mBottomNav.getMenu();
对于(inti=0,size=menu.size();i
sauib,你说的menuitempl
是什么意思?你能再解释一下这段代码吗。。
Menu menu = mBottomNav.getMenu();
for (int i = 0, size = menu.size(); i < size; i++) {
MenuItem menuItem = menu.getItem(i);
((MenuItemImpl) menuItem).setExclusiveCheckable(false);
menuItem.setChecked(menuItem.getItemId() == R.id.menu_home);
((MenuItemImpl) menuItem).setExclusiveCheckable(true);
}