我想在一个碎片中展示一个底部导航栏，里面有3个选项，并且代码没有错误，显示正确。但问题是，当我点击其中一个选项时，应该被执行的代码不起作用，甚至不会在控制台上记录任何内容。
TransporteFragment.Java：
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.BottomNavigationView;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
/**
* A simple {@link Fragment} subclass.
*/
public class TransporteFragment extends Fragment {
public TransporteFragment() {
// Required empty public constructor
}
private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
= new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.action_busC1:
return true;
case R.id.action_busC2:
BusC2Fragment busC2Fragment = new BusC2Fragment();
FragmentManager fragmentManager = getChildFragmentManager();
fragmentManager.beginTransaction().replace(R.id.espacioLineas, busC2Fragment).commit();
return true;
case R.id.action_busC3:
return true;
}
return false;
}
};
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final View v = inflater.inflate(R.layout.fragment_transporte, container, false);
BottomNavigationView navegacion = (BottomNavigationView) v.findViewById(R.id.navbartransporte);
navegacion.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_transporte, container, false);
}
}
fragment_transporte.xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.gberti.smarthuesca.TransporteFragment">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/espacioLineas">
</FrameLayout>
<android.support.design.widget.BottomNavigationView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/navbartransporte"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:layout_alignParentBottom="true"
android:background="@color/white"
app:menu="@menu/navbar_transporte_items" />
</RelativeLayout>
谢谢您。