CODEWITHSUNDEEP
androidandroid-fragments
DolDurma
DolDurma

Reputation: 17330

Android duplication on Fragment Transaction

in my main activity i have this line to replace fragment with viewgroup

MainActivity:

public class ActivityMain extends AppCompatActivity {
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        getSupportFragmentManager().beginTransaction()
                .replace(R.id.activity_main_container, new HomeFragment())
                .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN)
                .addToBackStack(null)
                .commit();
    }
}

activity layout:

<android.support.design.widget.CoordinatorLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <FrameLayout
        android:id="@+id/activity_main_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:clickable="true"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"/>

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

and my HomeFragment is:

public class HomeFragment extends Fragment {

    public HomeFragment() {

    }

    @Override
    public void onCreate(Bundle saved) {
        super.onCreate(saved);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_test, container, false);
        Log.e("HomeFragment", " onCreateView");
        return view;
    }
}

now after build application and run that on emulator, my code running duplicate HomeFragment, how can i prevent this action?

Upvotes: 0

Views: 36

Answers (2)

Jeelan
Jeelan

Reputation: 173

Do like this if fragment is already launched don't perform transaction again

private Class mFragmentClass; mFragmentClass = InfoFragment.class; 
if (null != mFragmentClass) { 
try { 
mFragment = (Fragment) mFragmentClass.newInstance();
if(mFragment instanceof (Fragment)mFragmentClass){
 FragmentManager fragmentManager = getSupportFragmentManager(); fragmentManager.beginTransaction().replace(R.id.content_navigation_menu, mFragment).commit(); 
} catch (InstantiationException exception) { exception.printStackTrace();
 } catch (IllegalAccessException exception) { exception.printStackTrace(); }
}else {
//do nothing
}

Upvotes: 0

Kevin Krumwiede
Kevin Krumwiede

Reputation: 10308

The framework will restore your fragment state when an activity is restored, such as after a configuration change. You should only manipulate fragments the first time an activity is created.

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    if(savedInstanceState == null) {
        // set up your fragments
    }  
}

Upvotes: 1

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