Android Open Source - coursera-android-001 Main Activity

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License

The source code is released under:

MIT License

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Java Source Code

package course.labs.fragmentslab;
/*from   w w  w  . j a  va  2s  . c  o  m*/
import android.app.Activity;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.util.Log;

public class MainActivity extends Activity implements
    FriendsFragment.SelectionListener {

  private static final String TAG = "Lab-Fragments";

  private FriendsFragment mFriendsFragment;
  private FeedFragment mFeedFragment;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main_activity);

    // If the layout is single-pane, create the FriendsFragment 
    // and add it to the Activity

    if (!isInTwoPaneMode()) {
      
      mFriendsFragment = new FriendsFragment();

      // add the FriendsFragment to the fragment_container
      getFragmentManager().beginTransaction().add(R.id.fragment_container, mFriendsFragment).commit();

    } else {

      // Otherwise, save a reference to the FeedFragment for later use

      mFeedFragment = (FeedFragment) getFragmentManager()
          .findFragmentById(R.id.feed_frag);
    }

  }

  // If there is no fragment_container ID, then the application is in
  // two-pane mode

  private boolean isInTwoPaneMode() {

    return findViewById(R.id.fragment_container) == null;
  
  }

  // Display selected Twitter feed

  public void onItemSelected(int position) {

    Log.i(TAG, "Entered onItemSelected(" + position + ")");

    // If there is no FeedFragment instance, then create one

    if (mFeedFragment == null)
      mFeedFragment = new FeedFragment();

    // If in single-pane mode, replace single visible Fragment

    if (!isInTwoPaneMode()) {

      //replace the fragment_container with the FeedFragment
            getFragmentManager().beginTransaction().replace(R.id.fragment_container, mFeedFragment).addToBackStack(null).commit();
      

      // execute transaction now
      getFragmentManager().executePendingTransactions();

    }

    // Update Twitter feed display on FriendFragment
    mFeedFragment.updateFeedDisplay(position);

  }

}

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