[英]Change ActionBar title from Fragment
我有四个片段
问题
当我在两个fragment
之间跳转时,每个fragment
中都没有显示正确的标题。
标题应与每个片段中的文本相同。
我的MainActivity
看起来像这样:
public class MainActivity extends AppCompatActivity {
private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFragment(new InfoFragment(), "INFO");
adapter.addFragment(new NavFragment(), "NAV");
adapter.addFragment(new PetrolFragment(), "PETROL");
adapter.addFragment(new CalcFragment(), "CALC");
viewPager.setAdapter(adapter);
}
public void setActionBarTitle(String title) {
getSupportActionBar().setTitle(title);
}
我的每个片段如下所示:
public class InfoFragment extends Fragment {
public InfoFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
((MainActivity) getActivity()).setActionBarTitle("INFO"); // here are other names according to each fragment
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_info, container, false);
}
}
我不知道这是否是正确的方法,但是您可以将页面更改侦听器添加到viewpager中,并可以在onPageSelected方法中更改标题:
yourViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
// change your title
// inflate menu
// customize your toolbar
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
试试下面的代码
对于片段标题:
getActivity().getActionBar().setTitle("Fragment1");
将此行添加到所有片段onCreate
或OnCreateView
方法中
((MainActivity) getActivity()).setActionBarTitle("Your title");
默认情况下在MainActivity
设置一个片段
viewPager.setCurrentItem(0);
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