【发布时间】：2018-12-20 09:48:51
【问题描述】：
在MainPage 中，有NavigationDrawer 和BottomNavigationBar。当我点击Home 时，导航抽屉图标和操作栏标题不见了。
主页
public class MainPage extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_page);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);
navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
navigation.setSelectedItemId(R.id.navigation_home);
}
private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
= new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
Fragment fragment;
switch (item.getItemId()) {
case R.id.navigation_home:
fragment = new HomePage();
loadFragment(fragment);
return true;
case R.id.navigation_dashboard:
return true;
case R.id.navigation_notifications:
return true;
}
return false;
}
};
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the main; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_camera) {
// Handle the camera action
} else if (id == R.id.nav_gallery) {
} else if (id == R.id.nav_slideshow) {
} else if (id == R.id.nav_manage) {
} else if (id == R.id.nav_share) {
} else if (id == R.id.nav_send) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
private void loadFragment(Fragment fragment) {
// load fragment
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.rl, fragment);
transaction.addToBackStack(null);
transaction.commit();
}
}
主页
public class HomePage extends Fragment {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.app_bar_main, container, false);
RecyclerView mRecyclerView = view.findViewById(R.id.recycleView);
GridLayoutManager mGridLayoutManager = new GridLayoutManager(getActivity(), 2);
mRecyclerView.setLayoutManager(mGridLayoutManager);
mRecyclerView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
List <Book> bookList= new ArrayList<>();
Book book = new Book();
book = new Book("Introduction to Java Programming", 15.00, "4.5", Uri.parse("android.resource://com.example.seng.sechandapp/drawable/book").toString());
bookList.add(book);
book = new Book("Java", 15.00, "4.5", Uri.parse("android.resource://com.example.seng.sechandapp/drawable/book").toString());
bookList.add(book);
HomePageAdapter homePageAdapter = new HomePageAdapter(getActivity(), bookList);
mRecyclerView.setAdapter(homePageAdapter);
return view;
}
}
app_bar_main
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.seng.sechandapp.MainPage">
<LinearLayout android:layout_width="match_parent" android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
android:orientation="vertical">
<android.support.design.widget.AppBarLayout
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="@color/blueviolet"
app:popupTheme="@style/AppTheme.PopupOverlay"/>
</android.support.design.widget.AppBarLayout>
<include layout="@layout/home_page"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
</android.support.design.widget.CoordinatorLayout>
主页
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/recycleView">
</android.support.v7.widget.RecyclerView>
</FrameLayout>
【问题讨论】：
-
你在为
HomePage的布局膨胀app_bar_main，所以这是一个全新的Toolbar覆盖在Activity的顶部，这就是切换和标题消失的原因.您可能打算在那里膨胀home_page。另外，我不确定你想要什么作为启动时的主要内容，但<include>可能应该是一个空的<FrameLayout>，它的 ID 是你将在replace()调用中传递的，而不是 @ 987654339@.
标签： android navigation-drawer bottomnavigationview