如何在活动之间使用BottomNavigationView按下时突出显示项目？ [英] How to highlight the item when pressed using BottomNavigationView between activities?
问题描述
我已为我的应用添加了底部导航视图，但我需要在活动之间而不是片段之间的底部导航视图，所以我已将此代码添加到Java以用于我的所有3个活动。
I have added Bottom Navigation View for my app but I need the Bottom Navigation View between activities instead of fragment so I have added this code to Java for all my 3 activities.
当我在手机中选择第二个或第三个时，所有内容都是正确的，但问题是突出显示第一个项目。
我需要突出显示我按下的项目。
I need to highlight the item I press.
我使用了片段并且它工作正常但我仍然是使用片段的初学者所以我正在使用活动。
第一个活动代码是：
BottomNavigationView mBottomNavigation;
mBottomNavigation =(BottomNavigationView) findViewById(R.id.BottomNavigator);
mBottomNavigation.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()){
case R.id.Nav_Second:
Intent Second= new Intent(First.this, Second.class);
startActivity(Second);
break;
case R.id.Nav_Third:
Intent Third= new Intent(First.this, Third.class);
startActivity(Third);
break;
}
return true;
}
});
}}
第二项活动是：
BottomNavigationView mBottomNavigation;
BottomNavigationView mBottomNavigation;
mBottomNavigation =(BottomNavigationView) findViewById(R.id.BottomNavigator);
mBottomNavigation.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()){
case R.id.Nav_First:
Intent First= new Intent(Second.this, First.class);
startActivity(First);
break;
case R.id.Nav_Third:
Intent Third= new Intent(Second.this, Third.class);
startActivity(Third);
break;
}
return true;
}
});
}}
第三项活动是：
BottomNavigationView mBottomNavigation;
BottomNavigationView mBottomNavigation;
mBottomNavigation =(BottomNavigationView) findViewById(R.id.BottomNavigator);
mBottomNavigation.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()){
case R.id.Nav_First:
Intent First= new Intent(Third.this, First.class);
startActivity(First);
break;
case R.id.Nav_Second:
Intent Second= new Intent(Third.this, Second.class);
startActivity(Second);
break;
}
return true;
}
});
}}
3的xml相同活动：
The xml are the same for 3 activities:
<android.support.design.widget.BottomNavigationView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/BottomNavigator"
android:background="@color/colorPrimaryDark"
android:layout_alignParentBottom="true"
app:itemTextColor="@drawable/item_bg"
app:itemIconTint="@drawable/item_bg"
app:menu="@menu/navigate_items">
</android.support.design.widget.BottomNavigationView>
推荐答案
您可以将BottomNavigationView与表示选项卡的活动一起使用。关键是在每个活动中重复导航视图组件，并让每个活动的代码控制导航组件：在导航项目点击时启动正确的活动，并在活动开始后选择正确的导航项目。
You can use BottomNavigationView with activities representing tabs. The key is to repeat the navigation view component in each activity, and have the code of each activity control the navigation component: starting the right activity on navigation item clicks and selecting a proper navigation item after the activity has started.
您需要延迟启动新选择的活动（标签），以便在新活动替换上一个活动之前完成标签切换动画。
You need to start newly selected activities (tabs) with a delay as to allow the tab switching animation to complete before the new activity replaces the previous one.
我的方法是让表示标签的所有活动都从实现公共行为的同一BaseActivity类继承。
My approach was to have all activities representing tabs inherit from the same BaseActivity class implementing the common behavior.
这是示例BaseActivity的代码：
This is the code of an example BaseActivity:
public abstract class BaseActivity extends AppCompatActivity implements BottomNavigationView.OnNavigationItemSelectedListener {
protected BottomNavigationView navigationView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(getContentViewId());
navigationView = (BottomNavigationView) findViewById(R.id.navigation);
navigationView.setOnNavigationItemSelectedListener(this);
}
@Override
protected void onStart() {
super.onStart();
updateNavigationBarState();
}
// Remove inter-activity transition to avoid screen tossing on tapping bottom navigation items
@Override
public void onPause() {
super.onPause();
overridePendingTransition(0, 0);
}
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
navigationView.postDelayed(() -> {
int itemId = item.getItemId();
if (itemId == R.id.navigation_home) {
startActivity(new Intent(this, HomeActivity.class));
} else if (itemId == R.id.navigation_dashboard) {
startActivity(new Intent(this, DashboardActivity.class));
} else if (itemId == R.id.navigation_notifications) {
startActivity(new Intent(this, NotificationsActivity.class));
}
finish();
}, 300);
return true;
}
private void updateNavigationBarState(){
int actionId = getNavigationMenuItemId();
selectBottomNavigationBarItem(actionId);
}
void selectBottomNavigationBarItem(int itemId) {
Menu menu = navigationView.getMenu();
for (int i = 0, size = menu.size(); i < size; i++) {
MenuItem item = menu.getItem(i);
boolean shouldBeChecked = item.getItemId() == itemId;
if (shouldBeChecked) {
item.setChecked(true);
break;
}
}
}
abstract int getContentViewId();
abstract int getNavigationMenuItemId();
}
这是我基于Android Studio底层导航的完整示例活动模板：
This is my whole example based on the Android Studio's Bottom Navigation Activity template:
https://github.com/ddekanski / BottomNavigationViewBetweenActivities
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