问题
I have been using the latest Toolbar from AppCompatv7 lib.I have placed a textview in the ToolBar ViewGroup And I want to set a title into this Textview from the fragment in my activity.In case of a custom action bar ((ActionBarActivity)getActivity).setcustomView(..) would have done the job.But due to use of this ToolBar I am not able to use that.Also I have implemented a method in my BaseActivity that is inherited by all Activities.This BaseActivity contains my method to initialize a sliding drawer to the left.I have to initialize the initDrawerLayout() method in activity else the drawer would not be initialized.And if I initialize it in fragment its giving me all empty results,neither the toggle button for drawer and nor is the custom title getting set.
This is my initDrawer code..
public void initDrawerLayout(String toolbar_text) {
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerRelative = (RelativeLayout) findViewById(R.id.drawer_relative);
if (mDrawerLayout != null) {
findViewById(R.id.drawer_btn_a).setOnClickListener(this);
findViewById(R.id.drawer_btn_b).setOnClickListener(this);
findViewById(R.id.drawer_btn_c).setOnClickListener(this);
findViewById(R.id.drawer_btn_d).setOnClickListener(this);
findViewById(R.id.drawer_btn_e).setOnClickListener(this);
findViewById(R.id.drawer_btn_f).setOnClickListener(this);
findViewById(R.id.drawer_btn_g).setOnClickListener(this);
findViewById(R.id.drawer_btn_h).setOnClickListener(this);
findViewById(R.id.drawer_btn_i).setOnClickListener(this);
findViewById(R.id.drawer_btn_j).setOnClickListener(this);
findViewById(R.id.drawer_btn_k).setOnClickListener(this);
findViewById(R.id.drawer_btn_l).setOnClickListener(this);
findViewById(R.id.my_layout).setOnClickListener(this);
Toolbar toolbar = (Toolbar) findViewById(R.id.my_awesome_toolbar);
toolbar.setBackground(getResources().getDrawable(R.drawable.icn_actionbar_background));
TextView mTitle = (TextView) toolbar.findViewById(R.id.toolbar_title);
mTitle.setText(toolbar_text);
mTitle.setTypeface(Typeface.DEFAULT_BOLD);
if (toolbar != null) {
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
toolbar.setNavigationIcon(R.drawable.ic_drawer);
mDrawerToggle = new ActionBarDrawerToggle(
this, mDrawerLayout, toolbar,
R.string.drawer_open, R.string.drawer_close
);
mDrawerLayout.setDrawerListener(mDrawerToggle);
toolbar.setNavigationOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (mDrawerLayout.isDrawerOpen(Gravity.LEFT)) {
mDrawerLayout.closeDrawer(Gravity.LEFT);
} else {
mDrawerLayout.openDrawer(Gravity.LEFT);
}
}
});
mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow,
GravityCompat.START);
mDrawerLayout.setScrimColor(getResources().getColor(
android.R.color.transparent));
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
getSupportActionBar().setDisplayShowTitleEnabled(false);
}
}
And this my code in the fragment..
((FirstActivity) getActivity()).initDrawerLayout(mFirst.name);
where mFirst is a object of class Person
and the toolbar code..
<android.support.v7.widget.Toolbar
android:id="@+id/my_awesome_toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="?attr/actionBarSize">
<TextView
android:id="@+id/toolbar_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:gravity="center"
android:text="Toolbar Title"
android:textColor="@color/action_text-color"
android:textSize="18sp"
android:textStyle="bold" />
</android.support.v7.widget.Toolbar>
Please help guys..
回答1:
To allow a Fragment to communicate up to its Activity (to set your Toolbar Title), you can define an interface in the Fragment class and implement it within the Activity as described here: Communicating with Other Fragments.
回答2:
I do this like this: from the fragment call
getActivity().setTitle("your title");
Also you can call any function of your parent Activity like this:
YourActivity mYourActiviy = (YourActivity) getActivity();
mYourActivity.yourActivityFunction(yourParameters);
回答3:
In Kotlin.
In fragment:
(activity as YourActivity).supportActionBar?.title = getString(R.string.your_title)
In activity:
setSupportActionBar(toolbar)
supportActionBar?.setDisplayHomeAsUpEnabled(true)
supportActionBar?.setDisplayShowHomeEnabled(true)
回答4:
The answer is writen below in the oncreateview method of fragments.
getActivity().setTitle("your name");
回答5:
If you have setSupportActionBar in Your Activity then you can easily change the toolbar title from your fragment
((YourActivity) getActivity()).getSupportActionBar().setTitle("Your Title");
回答6:
You can create Interface inside the Fragment. check below:-
public class MyFragment extends Fragment {
OnMyFragmentListener mListener;
// Where is this method called??
public void setOnMyFragmentListener(OnMyFragmentListener listener) {
this.mListener = listener;
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnMyFragmentListener) {
mListener = (OnMyFragmentListener) context;
mListener.onChangeToolbarTitle("My Fragment"); // Call this in `onResume()`
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
@Override
public void onResume(){
super.onResume();
mListener.onChangeToolbarTitle("My Fragment");
}
// This interface can be implemented by the Activity, parent Fragment,
// or a separate test implementation.
public interface OnMyFragmentListener {
public void onChangeToolbarTitle(String title);
}
}
In Activity:-
public class MyActivity extends AppCompatActivity implements MyFragment.OnMyFragmentListener {
@Override
public void onChangeToolbarTitle(String title){
toolbar.setTitle(title);
}
}
This works for me. :)
回答7:
This work for me :
Toolbar toolbar = (Toolbar) getActivity().findViewById(R.id.id_toolbar);
toolbar.setTitle("New Title");
回答8:
You can change the title of your toolbar on the event OnAttach, something like this
var toolbar = activity.FindViewById<Android.Support.V7.Widget.Toolbar>(Resource.Id.toolbar);
toolbar.Title = "New Title";
回答9:
If you are using a custom toolbar, this will help you:
Toolbar toolbar = (Toolbar) getActivity().findViewById(R.id.toolbar);
toolbar.setTitle("Feedback");
回答10:
If somebody struggles with this problem, this may be useful.
Basically you have 4 options, how to handle that:
- use an interface in order to communicate with your activity, or any other convenient method, like an event bus.
- you call
getActivity().setTitle("Title"), but in this case you need to attach yourToolbarto theActionBarby calling thesetSupportActionBar()in your activity. - You can have a public instance of your
Toolbarand access that instance from the fragment. Finally, if you need the instance of your
Toolbar(you may want to do something else with), you can simply get it this way:Toolbar bar=Toolbar.class.cast(getActivity().findViewById(R.id.toolbar));
Well, the last option would solve the problem only if the Toolbar hasn't been passed to the setSupportActionBar method.
If it has been, then you need to call this method in your activity:
supportActionBar.setDisplayShowTitleEnabled(false),
which will solve the problem.
However, I would suggest to use ButterKnife which will make it a little bit cleaner, here an example:
Toolbar actionBar=findById(getActivity(),R.id.actionBar);
actionBar.setTitle("Title");
回答11:
getSupportFragmentManager().addOnBackStackChangedListener(new FragmentManager.OnBackStackChangedListener() {
@Override
public void onBackStackChanged() {
FragmentManager.BackStackEntry lastBackStackEntry=null;
int lastBackStackEntryCount = getSupportFragmentManager().getBackStackEntryCount() - 1;
if(lastBackStackEntryCount >= 0 )
{
lastBackStackEntry = getSupportFragmentManager().getBackStackEntryAt(lastBackStackEntryCount);
}
Toast.makeText(MainActivity.this, ""+lastBackStackEntryCount, Toast.LENGTH_SHORT).show();
if(lastBackStackEntryCount == -1)
{
toolbar.setTitle("");
toolbar.setLogo(R.drawable.header_logo);
}
else
{
toolbar.setTitle(lastBackStackEntry.getName());
}
}
});
回答12:
In your Activity declare the toolbar as public.
public class YourActivity : Activity
{
public Toolbar toolbar;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = .... // initilize your toolbar
}
}
Then, from your fragment
((YourActivity) getActivity()).toolbar.Title = "Your Title";
回答13:
You need to set the title in activity commiting the fragment and return the fragment
getSupportFragmentManager().beginTransaction().replace(R.id.main_fragment, mainFragment).commit();
toolbar.setTitle("ShivShambhu");
return contentFragment;
This works for me.
回答14:
xml
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar_detail"
android:layout_width="match_parent"
android:layout_height="55dp"
android:paddingLeft="10dp"
android:paddingRight="10dp"
app:contentInsetStart="0dp"
app:contentInsetStartWithNavigation="0dp"
android:background="@color/tool_bar_color">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:gravity="center">
<TextView
android:id="@+id/toolbar_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:textColor="#fff"
android:textSize="16sp" />
</LinearLayout>
</android.support.v7.widget.Toolbar>
Find TextView Id from toolbar
if you are using Activity
TextView mTitle = findViewById(R.id.toolbar_title);
mTitle.setText("set your title");
if you are using Fragment
TextView mTitle = view.findViewById(R.id.toolbar_title);
mTitle.setText("set your title");
回答15:
For me the problem was that for some reason the label was overwritten. I had to change it back to the string resource, in
navigation.xml
inside the fragment tag;
android:label="@string/android_trivia"
回答16:
In Kotlin, I use
fun onAttach(...){
..
activity?.title = "My Title"
}
来源：https://stackoverflow.com/questions/27100007/set-title-intoolbar-from-fragment-in-android