In my MainActivity.java where I am trying to put tabs, I am having the error Cannot resolve method 'getSupportFragmentManager()' and in my other activity with tab that I created when selecting "Tabbed Activity" at the time of creating, this error does not happen. I removed the code from this Tabbed Activity and embedded it in my code. How to correct?
activity_main.xml:
<android.support.constraint.ConstraintLayout
android:id="@+id/constraintLayout2"
android:layout_width="360dp"
android:layout_height="511dp"
ads:layout_constraintBottom_toBottomOf="parent"
ads:layout_constraintEnd_toEndOf="parent"
ads:layout_constraintStart_toStartOf="parent"
ads:layout_constraintTop_toTopOf="parent"
tools:context="com.example.mateuspc1.tab.TabActivity$PlaceholderFragment">
<android.support.design.widget.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="@dimen/appbar_padding_top"
android:theme="@style/AppTheme.AppBarOverlay"
ads:layout_constraintStart_toStartOf="parent"
ads:layout_constraintTop_toTopOf="parent">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:layout_weight="1"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="@style/AppTheme.PopupOverlay"
app:title="@string/app_name">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="@+id/container"
android:layout_width="360dp"
android:layout_height="wrap_content"
ads:layout_behavior="@string/appbar_scrolling_view_behavior"
ads:layout_constraintStart_toStartOf="parent"
ads:layout_constraintTop_toBottomOf="@+id/appbar">
</android.support.v4.view.ViewPager>
<ScrollView
android:id="@+id/ScrollView01"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
ads:layout_constraintEnd_toEndOf="parent"
ads:layout_constraintStart_toStartOf="parent"
ads:layout_constraintTop_toBottomOf="@+id/appbar">
<android.support.constraint.ConstraintLayout
android:id="@+id/scrollcontainer"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ImageButton
android:id="@+id/vitasbut"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:contentDescription="@string/todo"
android:src="@drawable/vitas1e2"
ads:layout_constraintBottom_toTopOf="@+id/gtabut"
ads:layout_constraintEnd_toStartOf="@+id/vitasbut2"
ads:layout_constraintHorizontal_chainStyle="spread_inside"
ads:layout_constraintStart_toStartOf="parent"
ads:layout_constraintTop_toTopOf="parent" />
<ImageButton
android:id="@+id/vitasbut2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:contentDescription="@string/todo"
android:src="@drawable/vitas2e2"
ads:layout_constraintEnd_toStartOf="@+id/aiaichoquebut"
ads:layout_constraintStart_toEndOf="@+id/vitasbut"
ads:layout_constraintTop_toTopOf="parent" />
<ImageButton
android:id="@+id/gtabut"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:contentDescription="@string/todo"
android:src="@drawable/gta1e2"
ads:layout_constraintBottom_toTopOf="@+id/bolsbut"
ads:layout_constraintEnd_toStartOf="@+id/gtabut2"
ads:layout_constraintStart_toStartOf="parent"
ads:layout_constraintTop_toBottomOf="@+id/vitasbut" />
<ImageButton
android:id="@+id/gtabut2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:contentDescription="@string/todo"
android:src="@drawable/gta2e2"
ads:layout_constraintEnd_toStartOf="@+id/acertomizbut"
ads:layout_constraintStart_toEndOf="@+id/gtabut"
ads:layout_constraintTop_toBottomOf="@+id/vitasbut2" />
<ImageButton
android:id="@+id/gabebut"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:contentDescription="@string/todo"
android:src="@drawable/gabe1e2"
ads:layout_constraintEnd_toEndOf="parent"
ads:layout_constraintStart_toEndOf="@+id/gtabut2"
ads:layout_constraintTop_toBottomOf="@+id/aiaichoquebut" />
<ImageButton
android:id="@+id/bolsbut"
android:layout_width="0dp"
android:layout_height="105dp"
android:contentDescription="@string/todo"
android:src="@drawable/bols1e2"
ads:layout_constraintEnd_toStartOf="@+id/bolsbut2"
ads:layout_constraintStart_toStartOf="parent"
ads:layout_constraintTop_toBottomOf="@+id/gtabut" />
<ImageButton
android:id="@+id/bolsbut2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:contentDescription="@string/todo"
android:src="@drawable/bols2e2"
ads:layout_constraintEnd_toStartOf="@+id/aiaichoquebut"
ads:layout_constraintStart_toEndOf="@+id/bolsbut"
ads:layout_constraintTop_toBottomOf="@+id/gtabut2" />
<ImageButton
android:id="@+id/acertomizbut"
android:layout_width="111dp"
android:layout_height="0dp"
android:src="@drawable/acertmiz1e2"
ads:layout_constraintEnd_toEndOf="parent"
ads:layout_constraintStart_toEndOf="@+id/bolsbut2"
ads:layout_constraintTop_toBottomOf="@+id/gabebut" />
<ImageButton
android:id="@+id/aiaichoquebut"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/aiaichoque1e2"
ads:layout_constraintBottom_toTopOf="@+id/gabebut"
ads:layout_constraintEnd_toEndOf="parent"
ads:layout_constraintStart_toEndOf="@+id/vitasbut2"
ads:layout_constraintTop_toTopOf="parent" />
<ImageButton
android:id="@+id/bnsetimaartebut"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:src="@drawable/bnsetimaarte1e2"
ads:layout_constraintStart_toStartOf="parent"
ads:layout_constraintTop_toBottomOf="@+id/bolsbut" />
<ImageButton
android:id="@+id/fausteroubut"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/fausterou1e2"
ads:layout_constraintStart_toEndOf="@+id/bnsetimaartebut"
ads:layout_constraintTop_toBottomOf="@+id/onImageGalleryClicked" />
<ImageButton
android:id="@+id/fausttapegfogbut"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/faustfogo1e2"
ads:layout_constraintStart_toStartOf="parent"
ads:layout_constraintTop_toBottomOf="@+id/bnsetimaartebut" />
<Button
android:id="@+id/onImageGalleryClicked"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="24dp"
android:layout_marginStart="24dp"
android:layout_marginTop="24dp"
android:text="@string/button"
ads:layout_constraintStart_toEndOf="@+id/bnsetimaartebut"
ads:layout_constraintTop_toBottomOf="@+id/bolsbut2" />
<ImageView
android:id="@+id/imgPicture"
android:layout_width="53dp"
android:layout_height="55dp"
android:layout_marginStart="156dp"
android:layout_marginTop="74dp"
ads:layout_constraintStart_toEndOf="@+id/fausttapegfogbut"
ads:layout_constraintTop_toBottomOf="@+id/acertomizbut" />
</android.support.constraint.ConstraintLayout>
</ScrollView>
<android.support.design.widget.FloatingActionButton
android:id="@+id/fab"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_gravity="end|bottom"
android:layout_margin="@dimen/fab_margin"
android:layout_marginStart="280dp"
android:layout_marginTop="108dp"
ads:layout_constraintStart_toStartOf="parent"
ads:layout_constraintTop_toTopOf="parent"
ads:srcCompat="@android:drawable/ic_dialog_email" />
</android.support.constraint.ConstraintLayout>
<android.support.constraint.ConstraintLayout
android:id="@+id/adViewConstraint"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
ads:layout_constraintEnd_toEndOf="parent"
ads:layout_constraintStart_toStartOf="parent"
app:layout_constraintBottom_toBottomOf="parent">
<com.google.android.gms.ads.AdView
android:id="@+id/adView"
android:layout_width="320dp"
android:layout_height="50dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
app:adSize="BANNER"
app:adUnitId="ca-app-pub-3940256099942544/6300978111"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.656"
app:layout_constraintStart_toStartOf="parent" />
</android.support.constraint.ConstraintLayout>
MainActivity.java (part of the code):
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
ViewPager mViewPager = findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
-
public static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
public PlaceholderFragment() {
}
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_tab, container, false); // fragment_tab alterado de activity_main
TextView textView = rootView.findViewById(R.id.section_label);
textView.setText(getString(R.string.section_format, getArguments().getInt(ARG_SECTION_NUMBER)));
return rootView;
}
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
return PlaceholderFragment.newInstance(position + 1);
}
@Override
public int getCount() {
// Show 3 total pages.
return 3;
}
}
Ps: I'm a beginner.