Android Open Source - fragments Main Activity

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License

The source code is released under:
GNU General Public License
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Java Source Code

package edu.cs4730.frag6demo;
//from  w  w  w. ja  v  a 2  s  .com
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.ViewPager;
import android.view.Menu;

public class MainActivity extends FragmentActivity {
  String TAG = "MainActivity";
  ViewPager viewPager;
  FragLeft leftfrag;
  FragMid  midfrag;
  FragRight rightfrag;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //getSupportFragmentManager().beginTransaction().add(R.id.frag_container, firstFragment).commit();
    
    //first find the 3 fragments, if create them as needed.
    //Remember fragments can survive the restart of an activity on orientation change.
    FragmentManager fragmentManager = getSupportFragmentManager();
    if (savedInstanceState != null) {
      leftfrag = (FragLeft) fragmentManager.getFragment(savedInstanceState, "LEFT");
      midfrag  = (FragMid) fragmentManager.getFragment(savedInstanceState,"MIDDLE");
      rightfrag = (FragRight) fragmentManager.getFragment(savedInstanceState,"RIGHT");
      //since survived, remove them from the fragment manager, so don't double add them.
        FragmentTransaction remove = fragmentManager.beginTransaction();
        remove.remove(leftfrag);
        remove.remove(midfrag);
        remove.remove(rightfrag);
        if (!remove.isEmpty()) {
            remove.commit();
            fragmentManager.executePendingTransactions();
        }
    } else {
        leftfrag = new FragLeft();
        midfrag = new FragMid();
        rightfrag = new FragRight();
      }

    viewPager = (ViewPager) findViewById(R.id.pager);
    if (viewPager != null) {
      //in portrait mode
      viewPager.setAdapter(new ThreeFragmentPagerAdapter(fragmentManager));
    } else {
      //in landscape mode
          fragmentManager.beginTransaction()
            .add(R.id.frag_left, leftfrag, "LEFT")
            .add(R.id.frag_mid, midfrag, "MIDDLE")
            .add(R.id.frag_right, rightfrag, "RIGHT")
            .commit();
    }
  }

  @Override protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
//    if (ViewPager != null) {
//      outState.putInt(KEY_PAGE, pager.getCurrentItem());
//    } else {
//      outState.putInt(KEY_PAGE, lastPage);
//    }
      FragmentManager fragmentManager = getSupportFragmentManager();
      fragmentManager.putFragment(outState, "LEFT", leftfrag);
      fragmentManager.putFragment(outState,"MIDDLE", midfrag);
      fragmentManager.putFragment(outState,"RIGHT", rightfrag);
  }
  
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
  }

  public class ThreeFragmentPagerAdapter extends FragmentPagerAdapter {
    int PAGE_COUNT =3;
    
    public ThreeFragmentPagerAdapter(FragmentManager fm) {
      super(fm);
    }

    @Override
    public Fragment getItem(int position) {
      
      switch (position) {
        case 0: return leftfrag;
        case 1: return midfrag;
        case 2: return rightfrag;
        default: return null;
      }
    }

    @Override
    public int getCount() {

      return PAGE_COUNT;
    }
  
    //getPageTitle required for the PageStripe to work and have a value.
        @Override
        public CharSequence getPageTitle(int position) {
              
          //return String.valueOf(position);  //returns string of position for title
          return "Page "+ String.valueOf(position +1);
          
        }
    
  }
}
Java Source Code List
