问题描述
我正在构建一个具有BottomNavigationView的应用程序.一切正常，直到我进入活动.
i am building an application in which i have a BottomNavigationView. Everything works fine until i get to the Activity.
导航是这样的:
问题是它具有此默认动画，因此每次将活动元素推得都比其他元素高.
The problem is that it has this default animation so it pushes the active element everytime higher than the rest.
另一个例子:
所以我的问题是如何摆脱这种默认动画，并且当我在它们之间切换时，每个项目都是对齐的?
So my question is how to get rid of this default animation and every item is aligned when i switch between them?
我的代码:
public class MainActivity extends AppCompatActivity {
private BottomNavigationView bottomNavigationView;
private Fragment fragment;
private FragmentManager fragmentManager;
private FragmentTransaction transaction;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setupBottomBar();
}
private void setupBottomBar() {
bottomNavigationView = (BottomNavigationView)findViewById(R.id.bottomBar);
fragmentManager = getSupportFragmentManager();
fragment = new CardDeckFragment();
transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.activity_main, fragment).commit();
bottomNavigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()){
case R.id.action_card_deck:{
Toast.makeText(MainActivity.this, "Card Deck Selected", Toast.LENGTH_SHORT).show();
fragment = new CardDeckFragment();
break;
}
case R.id.action_favorites:{
Toast.makeText(MainActivity.this, "Favorites Selected", Toast.LENGTH_SHORT).show();
fragment = new FavoritesFragment();
break;
}
case R.id.action_favorites_another:{
Toast.makeText(MainActivity.this, "Image Selected", Toast.LENGTH_SHORT).show();
fragment = new ImageFragment();
break;
}
case R.id.action_profile:{
Toast.makeText(MainActivity.this, "Profile Selected", Toast.LENGTH_SHORT).show();
fragment = new ProfileFragment();
break;
}
case R.id.action_menu:{
Toast.makeText(MainActivity.this, "Menu Selected", Toast.LENGTH_SHORT).show();
fragment = new MenuFragment();
break;
}
}
transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.activity_main, fragment).commit();
return true;
}
});
}
}
和我的布局:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.realtimegaming.androidnative.testproject.MainActivity">
<android.support.design.widget.BottomNavigationView
android:id="@+id/bottomBar"
android:layout_alignParentBottom="true"
android:background="@color/brown"
android:layout_gravity="bottom"
android:gravity="bottom"
android:layout_marginTop="?attr/actionBarSize"
app:itemBackground="@color/colorPrimary"
app:menu="@menu/bottom_navigation_main"
app:itemIconTint="@color/white"
android:fitsSystemWindows="true"
android:animateLayoutChanges="false"
android:splitMotionEvents="false"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</RelativeLayout>
推荐答案
好吧，我找到了一种方法，以帮助他人.因此，默认情况下，当BottomNavigationView包含3个以上的项目时，添加shiftingmode = true.
Ok i found a way in case it helps someone else. So by default BottomNavigationView add shiftingmode = true when its more than 3 items.
目前您无法通过现有的API进行更改，并且禁用shift模式的唯一方法是使用反射.
At this moment you cannot change it through existing API and the only way to disable shift mode is to use reflection.
因此，我们可以使用此帮助程序来摆脱此问题:
So we can use this helper to get rid of this:
class BottomNavigationViewHelper {
static void removeShiftMode(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) {
Log.e("ERROR NO SUCH FIELD", "Unable to get shift mode field");
} catch (IllegalAccessException e) {
Log.e("ERROR ILLEGAL ALG", "Unable to change value of shift mode");
}
}
}
然后像这样使用它:
BottomNavigationView bottomNavigationView = (BottomNavigationView)findViewById(R.id.bottomBar);
BottomNavigationViewHelper.removeShiftMode(bottomNavigationView);
希望这可以帮助与我有相同问题的人！
Hope this helps someone with the same problem with me!!!
请记住，每次更改BottomNavigationView中的菜单项时，都需要执行此方法.
Remember, you'll need to execute this method each time you change menu items in your BottomNavigationView.
更新
根据不同的 stackoverflow问题，您还需要更新proguard配置文件(例如proguard-rules.pro)，上面的代码使用反射，如果proguard混淆了mShiftingMode字段，则上述代码将无效.
As per different stackoverflow question, you also need to update proguard configuration file (e.g. proguard-rules.pro), code above uses reflection and won't work if proguard obfuscate the mShiftingMode field.
-keepclassmembers class android.support.design.internal.BottomNavigationMenuView {
boolean mShiftingMode;
}
这篇关于从BottomNavigationView android移除动画/移位模式的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！