Android 工具栏标题

无法更改工具栏标题我在其中设置了标题manifeast.xml& 还使用了setTitle("TITLE");

我将标题设置为历史与报告但它显示不同的标题通知这是另一个活动标题。

我检查了manifeast.xml但没有变化，任何人都可以帮助我吗？

这是我的代码

public class Nav_HistoryAndReports extends AppCompatActivity {

private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setTitle("History & Reports");
    setContentView(R.layout.nav_history_and_reports);

    toolbar = (Toolbar) findViewById(R.id.toolbar);
    setToolbar(toolbar);

    viewPager = (ViewPager) findViewById(R.id.viewpager);
    setupViewPager(viewPager);

    tabLayout = (TabLayout) findViewById(R.id.tabs);
    tabLayout.setupWithViewPager(viewPager);
}

public void setToolbar(Toolbar toolbar) {
    setSupportActionBar(toolbar);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}

private void setupViewPager(ViewPager viewPager) {
    ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
    adapter.addFragment(new FragmentHistoryAndReports_Visits(), "VISITS");
    adapter.addFragment(new FragmentHistoryAndReports_Visitors(), "VISITORS");
    adapter.addFragment(new FragmentHistoryAndReports_Map(), "MAP");
    viewPager.setAdapter(adapter);
}

class ViewPagerAdapter extends FragmentPagerAdapter {
    private final List<Fragment> mFragmentList = new ArrayList<>();
    private final List<String> mFragmentTitleList = new ArrayList<>();

    public ViewPagerAdapter(FragmentManager manager) {
        super(manager);
    }

    @Override
    public Fragment getItem(int position) {
        return mFragmentList.get(position);
    }

    @Override
    public int getCount() {
        return mFragmentList.size();
    }

    public void addFragment(Fragment fragment, String title) {
        mFragmentList.add(fragment);
        mFragmentTitleList.add(title);
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return mFragmentTitleList.get(position);
    }
}

工具栏.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="1dp"
    android:background="@color/white"
    android:fitsSystemWindows="true"
    android:minHeight="?attr/actionBarSize"
    android:titleTextColor="@color/colorPrimary"
    app:layout_scrollFlags="scroll|enterAlways"
    app:navigationIcon="?attr/homeAsUpIndicator"
    app:theme="@style/GalaxyZooThemeToolbarDarkOverflow">

</android.support.v7.widget.Toolbar>

工具栏标题可以通过两种方式设置

1.布局XML

<android.support.design.widget.AppBarLayout

android:id="@+id/appBarLayout"
android:layout_width="match_parent"
android:layout_height="56dp"
android:elevation="4dp"
android:theme="@style/AppTheme.AppBarOverlay"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        app:title="Main Activity"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:navigationIcon="@drawable/ic_arrow_back_white_24dp"

        app:popupTheme="@style/AppTheme.PopupOverlay" />

</android.support.design.widget.AppBarLayout>

2.Java中它将在 AppCompatActivity 中工作

Toolbar toolbar = findViewById(R.id.toolbar);
toolbar.setTitle("Notice Board"); 
setSupportActionBar(toolbar);