在我的menu.xml文件中为BottomNavigationView添加4个项目后,它仅显示所选项目标题并隐藏所有其他标题.
我可以强制显示标题和图标.
这是我的代码.
我可以强制显示标题和图标.
这是我的代码.
<?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/action_home"
android:enabled="true"
android:icon="@drawable/ic_home_24dp"
android:title="@string/text_home"
app:showAsAction="ifRoom" />
<item
android:id="@+id/action_category"
android:enabled="true"
android:icon="@drawable/ic_grid_24dp"
android:title="@string/text_category"
app:showAsAction="ifRoom" />
<item
android:id="@+id/action_me"
android:enabled="true"
android:icon="@drawable/ic_me_24dp"
android:title="@string/text_me"
app:showAsAction="ifRoom" />
<item
android:id="@+id/action_setting"
android:enabled="true"
android:icon="@drawable/ic_cog_24dp"
android:title="@string/text_setting"
app:showAsAction="ifRoom" />
</menu>
<android.support.design.widget.BottomNavigationView android:id="@+id/bottom_navigation" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:background="@android:color/white" android:elevation="6dp" android:translationZ="6dp" app:menu="@menu/bottom_navigation_main" />
解决方法
试试这个代码,
activity_main.xml：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:design="http://schemas.android.com/apk/res-auto"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.segunfamisa.sample.bottomnav.MainActivity">
<FrameLayout
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:background="#f1f1f1">
</FrameLayout>
<android.support.design.widget.BottomNavigationView
android:id="@+id/navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="start"
design:menu="@menu/bottom_nav_items" />
</LinearLayout>
fragment_menu.xml：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/fragment_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.segunfamisa.sample.bottomnav.MenuFragment">
<TextView
android:id="@+id/text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:textColor="@android:color/white"
android:gravity="center"
/>
</RelativeLayout>
bottom_nav_items.xml：
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="@+id/action_home"
android:enabled="true"
android:icon="@android:drawable/ic_dialog_map"
android:title="One"
app:showAsAction="ifRoom"/>
<item
android:id="@+id/action_category"
android:enabled="true"
android:icon="@android:drawable/ic_dialog_info"
android:title="Two"
app:showAsAction="ifRoom"/>
<item
android:id="@+id/action_me"
android:enabled="true"
android:icon="@android:drawable/ic_dialog_email"
android:title="Three"
app:showAsAction="ifRoom"/>
<item
android:id="@+id/action_setting"
android:enabled="true"
android:icon="@android:drawable/ic_popup_reminder"
android:title="Four"
app:showAsAction="ifRoom"/>
</menu>
MainActivity.java：
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);
disableShiftMode(mBottomNav);
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);
}
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) {
//Timber.e(e,"Unable to get shift mode field");
} catch (illegalaccessexception e) {
//Timber.e(e,"Unable to change value of shift mode");
}
}
@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.action_home:
frag = MenuFragment.newInstance(getString(R.string.text_home),getColorFromres(R.color.color_home));
break;
case R.id.action_category:
frag = MenuFragment.newInstance(getString(R.string.text_notifications),getColorFromres(R.color.color_notifications));
break;
case R.id.action_me:
frag = MenuFragment.newInstance(getString(R.string.text_search),getColorFromres(R.color.color_search));
break;
case R.id.action_setting:
frag = MenuFragment.newInstance(getString(R.string.text_home),getColorFromres(R.color.color_home));
break;
}
// update selected item
mSelectedItem = item.getItemId();
// uncheck the other items.
for (int i = 0; i < mBottomNav.getMenu().size(); i++) {
MenuItem menuItem = mBottomNav.getMenu().getItem(i);
menuItem.setChecked(menuItem.getItemId() == item.getItemId());
}
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);
}
MenuFragment.java：
public class MenuFragment extends Fragment {
private static final String ARG_TEXT = "arg_text";
private static final String ARG_COLOR = "arg_color";
private String mText;
private int mColor;
private View mContent;
private TextView mTextView;
public static Fragment newInstance(String text,int color) {
Fragment frag = new MenuFragment();
Bundle args = new Bundle();
args.putString(ARG_TEXT,text);
args.putInt(ARG_COLOR,color);
frag.setArguments(args);
return frag;
}
@Override
public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_menu,container,false);
}
@Override
public void onViewCreated(View view,@Nullable Bundle savedInstanceState) {
super.onViewCreated(view,savedInstanceState);
// retrieve text and color from bundle or savedInstanceState
if (savedInstanceState == null) {
Bundle args = getArguments();
mText = args.getString(ARG_TEXT);
mColor = args.getInt(ARG_COLOR);
} else {
mText = savedInstanceState.getString(ARG_TEXT);
mColor = savedInstanceState.getInt(ARG_COLOR);
}
// initialize views
mContent = view.findViewById(R.id.fragment_content);
mTextView = (TextView) view.findViewById(R.id.text);
// set text and background color
mTextView.setText(mText);
mContent.setBackgroundColor(mColor);
}
@Override
public void onSaveInstanceState(Bundle outState) {
outState.putString(ARG_TEXT,mText);
outState.putInt(ARG_COLOR,mColor);
super.onSaveInstanceState(outState);
}
}
无论您需要做什么,只需禁用BottomNavigationView Shift模式,
在你的代码中使用此方法.
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,"Unable to change value of shift mode"); } }
mBottomNav = (BottomNavigationView) findViewById(R.id.navigation); disableShiftMode(mBottomNav);
它会工作.我在这里附上截图,
