I have created a sample tabbed activity in Android Studio, and I would like now to display some of my own fragments in it, rather than the default placeholder text.
In other projects, I would create a blank fragment and just add it with this code:
BlankFragment1 blankFragment1 = new BlankFragment1();
getSupportFragmentManager().beginTransaction().add(R.id.fragment_container, blankFragment1).commit();
If I import the blank fragment class and xml layout and simply paste these two lines within the PlaceholderFragment class, however, I get
Non-Static method cannot be referenced from a static context
So, I tried creating an instance of PlaceholderFragment and call getSupportFragmentManager() over it:
PlaceholderFragment placeholderFragment = new PlaceholderFragment();
placeholderFragment.getSupportFragmentManager().beginTransaction().add(R.id.container, blankFragment1).commit();
But now I get
Cannot resolve method 'getSupportFragmentManager()'
So I am thinking there might be a better and simpler way to go about doing this.
What is the best way to use some existing fragments in a tabbed activity?
For reference, this is the whole MainActivity class:
public class MainActivity extends FragmentActivity implements BlankFragment1.OnFragmentInteractionListener {
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {@link FragmentPagerAdapter} derivative, which will keep every
* loaded fragment in memory. If this becomes too memory intensive, it
* may be best to switch to a
* {@link android.support.v4.app.FragmentStatePagerAdapter}.
*/
private SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {@link ViewPager} that will host the section contents.
*/
private ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
//setSupportActionBar(toolbar);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onFragmentInteraction(Uri uri) {
//
}
/**
* A placeholder fragment containing a simple view.
*/
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_main, container, false);
BlankFragment1 blankFragment1 = new BlankFragment1();
PlaceholderFragment placeholderFragment = new PlaceholderFragment();
placeholderFragment.getSupportFragmentManager().beginTransaction().add(R.id.container, blankFragment1).commit();
//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;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "SECTION 1";
case 1:
return "SECTION 2";
case 2:
return "SECTION 3";
}
return null;
}
}
}
Provide your Fragment from getItem(int position) method of the adapter.
By default the adapter used is SectionsPagerAdapter. Go to SectionsPagerAdapter and inside there is a function called
@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);
}
Here you should return your fragment for postion where your want your fragment to be. For example if i want my fragment to appear in tab number 0, then it should be as follows.
@Override
public Fragment getItem(int position) {
if(position == 0){
return new YourExistingFragment();
}
else
return PlaceholderFragment.newInstance(position + 1);
}