[英]Toolbar title and options disappear on fragment
我有一個MainActivity,顯示一個包含TabLayout和ViewPager的片段。 如果我在SearchFragment中注釋掉onCreateView中的所有內容,我的工具欄將按預期顯示。
我的問題是當我使用FragmentTransaction顯示我的片段時,工具欄變為空白。
圖片解釋我的問題片段與空白工具欄 MainActivity與填充和標題工具欄
MainActivity.java
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar myToolbar = (Toolbar) findViewById(R.id.my_toolbar);
setSupportActionBar(myToolbar);
SearchFragment searchFragment = new SearchFragment();
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.add(searchFragment, null);
ft.addToBackStack(null);
ft.commit();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch(item.getItemId()) {
case R.id.action_create_item:
//Button pushed in toolbar
default:
return super.onOptionsItemSelected(item);
}
}
}
SearchFragment.java
public class SearchFragment extends Fragment {
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.menu_main, menu);
super.onCreateOptionsMenu(menu, inflater);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
return super.onOptionsItemSelected(item);
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
FragmentActivity v = getActivity();
v.setContentView(R.layout.searchfragment);
TabLayout tabLayout = (TabLayout) v.findViewById(R.id.tab_layout);
tabLayout.addTab(tabLayout.newTab().setText("Tab 1"));
tabLayout.addTab(tabLayout.newTab().setText("Tab 2"));
tabLayout.addTab(tabLayout.newTab().setText("Tab 3"));
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
final ViewPager viewPager = (ViewPager) v.findViewById(R.id.pager);
final PagerAdapter adapter = new PagerAdapter
(v.getSupportFragmentManager(), tabLayout.getTabCount());
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
setHasOptionsMenu(true);
return super.onCreateView(inflater, container, savedInstanceState);
}
}
searchfragment.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.Toolbar
android:id="@+id/my_toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="@color/colorPrimaryDark"
android:elevation="4dp"
android:theme="@style/ThemeOverlay.AppCompat.ActionBar"
android:popupTheme="@style/ThemeOverlay.AppCompat.Light"/>
<android.support.design.widget.TabLayout
android:id="@+id/tab_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/toolbar"
android:elevation="6dp"
android:minHeight="?attr/actionBarSize"
/>
<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_below="@id/tab_layout"/>
</LinearLayout>
最后是activity_main.xml
<RelativeLayout
android:id="@+id/main_layout"
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=".MainActivity">
<android.support.v7.widget.Toolbar
android:id="@+id/my_toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="@color/colorPrimaryDark"
android:elevation="4dp"
android:theme="@style/ThemeOverlay.AppCompat.ActionBar"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light"/>
<FrameLayout
android:id="@+id/fragmentContainer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"/>
</RelativeLayout>
我發現問題是工具欄設置在onCreateView的頂部。 我必須在SearchFragment的OnCreateView的最底部設置工具欄,如下所示:
FragmentActivity v = getActivity();
v.setContentView(R.layout.searchfragment);
TabLayout tabLayout = (TabLayout) v.findViewById(R.id.tab_layout);
tabLayout.addTab(tabLayout.newTab().setText("Tab 1"));
tabLayout.addTab(tabLayout.newTab().setText("Tab 2"));
tabLayout.addTab(tabLayout.newTab().setText("Tab 3"));
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
final ViewPager viewPager = (ViewPager) v.findViewById(R.id.pager);
final PagerAdapter adapter = new PagerAdapter
(v.getSupportFragmentManager(), tabLayout.getTabCount());
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
Toolbar myToolbar = (Toolbar) v.findViewById(R.id.my_toolbar);
((AppCompatActivity)getActivity()).setSupportActionBar(myToolbar);
setHasOptionsMenu(true);
v.setTitle("Mit fragment");
所以工具欄必須是我猜的最后一項。
嘗試這個..
setDisplayOptions(ActionBar.DISPLAY_SHOW_TITLE)
進入MainActivity.java
@Override
protected void onCreate(Bundle savedInstanceState) {
...
Toolbar myToolbar = (Toolbar) findViewById(R.id.my_toolbar);
setSupportActionBar(myToolbar);
if (getSupportActionBar() != null) {
getSupportActionBar().setDisplayOptions(ActionBar.DISPLAY_SHOW_TITLE);
}
...
}
並將標題設置為SearchFragment.java
的onCreateView
函數
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
...
getActivity().setTitle("My Fragment");
...
}
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