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.fragcomdemo;
//from   ww w .  j  a v  a 2s.c om
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.util.Log;


/*
 * This activity is acting as the go between for the First and Second fragment.
 * The main fragment is used to use launch either fragment.
 * 
 */
public class MainActivity extends FragmentActivity implements  MainFragment.OnFragmentInteractionListener,
                                FirstFragment.OnFragmentInteractionListener1, 
                                                             SecondFragment.OnFragmentInteractionListener2{

  int num_one =0;  //number of times firstfragment was called.
  int num_two =0;  //number of times secondfragment was called.
  String TAG = "MainActivity";
  //used to move the fragments.
  FragmentManager fragmentManager;
  int whichfragment =0;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    
    fragmentManager = getSupportFragmentManager();
    //setup the mainFragment to show.
    fragmentManager.beginTransaction().add(R.id.container, new MainFragment()).commit();
  }


  /*
   * This is the callback for MainFragment.  It takes as which number, which well is the fragment
   * to launch.
   */
  @Override
  public void onFragmentInteraction(int which) {
    //going to change via the transcation manager, instead of just a simple replace.
    FragmentTransaction transaction =fragmentManager.beginTransaction();
    
    //remove the current fragment...
    //transaction.remove(fragmentManager.findFragmentById(R.id.container));
    if (which == 1) { //first fragment
      //replace with first fragment
       transaction.replace(R.id.container,FirstFragment.newInstance(String.valueOf(num_one), "Called From MainFrag")); 
        num_one++;
        whichfragment =1;
    } else { //must be 2 (hopefully!)
      //replace with first fragment
      transaction.replace(R.id.container, SecondFragment.newInstance(String.valueOf(num_two), "Called From MainFrag"));
        num_two++;
        whichfragment=2;
    }
    // and add the transaction to the back stack so the user can navigate back
        transaction.addToBackStack(null);

      // Commit the transaction
      transaction.commit();

  }

  
  /*
   * This the callback interface for FirstFragment.  We are getting string of data
   * which we will then send the SecondFragment.
   */
  @Override
  public void onFragmentInteraction1(String Data) {
      
    //now change to the SecondFragment, pressing the back button should go to main fragment.
    FragmentTransaction transaction =fragmentManager.beginTransaction();
    //remove firstfragment from the stack and replace it with two.
    transaction.replace(R.id.container,  SecondFragment.newInstance(String.valueOf(num_two), Data));
    // and add the transaction to the back stack so the user can navigate back
        transaction.addToBackStack(null);

    // Commit the transaction
    transaction.commit();
      
    num_two++;
  }
  
  /*
   * This the callback interface for SecondFragment.  We are getting string of data
   * which we will then send the FirstFragment.
   */
  @Override
  public void onFragmentInteraction2(String Data) {
      
    //now change to the FirstFragment, pressing the back button should go to main fragment.
    FragmentTransaction transaction =fragmentManager.beginTransaction();
    
    //remove Secondfragment from the stack and replace it with one.
    transaction.replace(R.id.container, FirstFragment.newInstance(String.valueOf(num_one), Data));
    // and add the transaction to the back stack so the user can navigate back
        transaction.addToBackStack(null);

    // Commit the transaction
    transaction.commit();
    
    num_one++;
  }

  
  /*
   * 
   * If we wanted to deal with the back button, this is the method for it.
   * (non-Javadoc)
   * @see android.support.v4.app.FragmentActivity#onBackPressed()
   */
  @Override
  public void onBackPressed() {
       super.onBackPressed();

  }

}
Java Source Code List
