这是我的主要活动
public class MainActivity extends AppCompatActivity{
DrawerLayout mDrawerLayout;
NavigationView mNavigationView;
FragmentManager mFragmentManager;
FragmentTransaction mFragmentTransaction;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/**
*Setup the DrawerLayout and NavigationView
*/
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout);
mNavigationView = (NavigationView) findViewById(R.id.shitstuff) ;
/**
* Lets inflate the very first fragment
* Here , we are inflating the TabFragment as the first Fragment
*/
mFragmentManager = getSupportFragmentManager();
mFragmentTransaction = mFragmentManager.beginTransaction();
mFragmentTransaction.replace(R.id.containerView,new Recommendation()).commit();
/**
* Setup click events on the Navigation View Items.
*/
mNavigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
mDrawerLayout.closeDrawers();
if (menuItem.getItemId() == R.id.nav_item_lux_level_recomen) {
FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.containerView,new Recommendation()).commit();
}
if (menuItem.getItemId() == R.id.nav_item_room_index_calc) {
FragmentTransaction xfragmentTransaction = mFragmentManager.beginTransaction();
xfragmentTransaction.replace(R.id.containerView,new RoomIndex()).commit();
}
if (menuItem.getItemId() == R.id.nav_item_utilization_factor_calc) {
FragmentTransaction xfragmentTransaction = mFragmentManager.beginTransaction();
xfragmentTransaction.replace(R.id.containerView,new UtilizationFactorCalculator()).commit();
}
if (menuItem.getItemId() == R.id.nav_item_conversions) {
FragmentTransaction xfragmentTransaction = mFragmentManager.beginTransaction();
xfragmentTransaction.replace(R.id.containerView,new Conversion()).commit();
}
return false;
}
});
/**
* Setup Drawer Toggle of the Toolbar
*/
android.support.v7.widget.Toolbar toolbar = (android.support.v7.widget.Toolbar) findViewById(R.id.toolbar);
ActionBarDrawerToggle mDrawerToggle = new ActionBarDrawerToggle(this,mDrawerLayout, toolbar,R.string.app_name,
R.string.app_name);
mDrawerLayout.setDrawerListener(mDrawerToggle);
mDrawerToggle.syncState();
}
}
这是我的activity_main.xml
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:orientation="vertical">
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/colorPrimary"
android:id="@+id/toolbar"
/>
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:id="@+id/drawerLayout"
>
<FrameLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/containerView">
</FrameLayout>
<android.support.design.widget.NavigationView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:id="@+id/shitstuff"
app:itemTextColor="@color/colorPrimary"
app:menu="@menu/drawermenu"
android:layout_marginTop="0dp"
/>
</android.support.v4.widget.DrawerLayout>
这个我想要的活动在点击时更改了标题
public class RoomIndex extends Fragment {
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View x = inflater.inflate(R.layout.room_index,null);
((AppCompatActivity) getActivity()).getSupportActionBar().setTitle("Room Index");
return x;
}
}
我试过((AppCompatActivity)getActivity())。getSupportActionBar()。setTitle(“Room Index”); 但它返回错误 尝试在空对象引用上调用虚方法'void android.support.v7.app.ActionBar.setTitle(java.lang.CharSequence)'
我不知道什么是错的,我在互联网上搜索并尝试它,然后返回相同。
答案 0 :(得分:1)
首先在Activity的onCreate()中将Toolbar设置为SupportActionBar:
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
然后使用setTitle更改工具栏标题:
getActivity().setTitle("Your title");
希望这有帮助。
答案 1 :(得分:0)
您需要先在#MyMenuItem.active{
margin: 0px;
padding:0px;
color: red;
background-color: white;
}
方法中设置支持操作栏,然后才能检索它。
将代码修改为:
body{
padding: 0px;
margin: 0px
}
<强>更新强>
从源代码检查,您可能需要在设置Support ActionBar后添加此代码:
onCreate