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.frag3demo;
/* w  w w.ja  va 2 s.  c  o  m*/
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;

public class MainActivity  extends FragmentActivity implements titlefrag.Callbacks {
  boolean TwoPane = false;
  titlefrag firstFragment;
  textFrag secondFragment;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
         // Check whether the activity is using the layout version with
        // the fragment_container FrameLayout. If so, we must add the first fragment
        if (findViewById(R.id.frag_container) == null ) {
          //landscape or large mode.  both fragments will be displayed on the screen.
          Log.d("fd3", "two pane");
          TwoPane = true;
        } else { 
          //protrait mode
          Log.d("fd3", "one pane");
         //get them if they already exist else create them.
          firstFragment = (titlefrag) getSupportFragmentManager().findFragmentByTag("first");
          if (firstFragment == null) {
            firstFragment = new titlefrag();
          }
          secondFragment = (textFrag) getSupportFragmentManager().findFragmentByTag("Second");
          if (secondFragment == null) {
            secondFragment = new textFrag();
              Bundle args = new Bundle();
              args.putInt("position",  0);
              secondFragment.setArguments(args);
          }
          FragmentManager fragmentManager = getSupportFragmentManager();
        FragmentTransaction remove = fragmentManager.beginTransaction();
        remove.remove(firstFragment);
        remove.remove(secondFragment);
        if (!remove.isEmpty()) {
            remove.commit();
            fragmentManager.executePendingTransactions();
        }
            // However, if we're being restored from a previous state,
            // then we don't need to do anything and should return or else
            // we could end up with overlapping fragments.
//          if (savedInstanceState != null) {
//                return; 
//            }
            // In case this activity was started with special instructions from an Intent,
            // pass the Intent's extras to the fragment as arguments
//            firstFragment.setArguments(getIntent().getExtras());

            // Add the fragment to the 'fragment_container' FrameLayout
            fragmentManager.beginTransaction().replace(R.id.frag_container, firstFragment, "first").commit();
        }
  }
  
  /**
   * Callback method from {@link ItemListFragment.Callbacks} indicating that
   * the item with the given ID was selected.
   */
  @Override
  public void onItemSelected(int id) {
    if (TwoPane) {
      Log.d("fd3", "two pane");
      //The activity has access to the fragment, so we will just call a method in the fragment.
      //textFrag tf = (textFrag) getFragmentManager().findFragmentById(R.id.frag_text);
      //tf.setText(id);  
      ((textFrag) getSupportFragmentManager().findFragmentById(R.id.frag_text)
          ).setText(id);
    } else {
      Log.d("fd3", "one pane");
      // In single-pane mode, simply start the detail activity
      // for the selected item ID.
//      Log.d("fd2", "one pane");
//      Intent detailIntent = new Intent(this, textActivity.class);
//      detailIntent.putExtra(textFrag.ARG_TEXT_ID, id);
//      startActivity(detailIntent);
      
      //set the position correctly.  We defaulted it to zero.
          Bundle args = new Bundle();
          args.putInt("position",  id);
          secondFragment.setArguments(args);
      FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();

      // Replace whatever is in the fragment_container view with this fragment,
      // and add the transaction to the back stack so the user can navigate back
      transaction.replace(R.id.frag_container, secondFragment, "second" );
      transaction.addToBackStack(null);

      // Commit the transaction
      transaction.commit();
    }
  }
}
Java Source Code List
