安卓工具栏标题

Question

无法更改工具栏标题 我在 manifeast.xml 中设置了标题并且还使用了 setTitle("TITLE");

我将标题设置为 History & Reports 但它显示不同的标题 Notifications 这是另一个 Activity 标题。

我检查了 manifeast.xml 但没有变化，任何人都可以帮助我解决这个问题。

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);
    }
}

toolbar.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>

Answer 1

Toolbar Title可以通过两种方式设置

1.在布局 XML 中

<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>

<强>2。在Java中它将在 AppCompatActivity 中工作

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