NoteFragment.java

package com.commonsware.empublite;

import android.app.Fragment;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import org.greenrobot.eventbus.EventBus;
import org.greenrobot.eventbus.Subscribe;
import org.greenrobot.eventbus.ThreadMode;

public class NoteFragment extends Fragment {
  public interface Contract {
    void closeNotes();
  }

  private static final String KEY_POSITION="position";
  private EditText editor=null;

  static NoteFragment newInstance(int position) {
    NoteFragment frag=new NoteFragment();
    Bundle args=new Bundle();

    args.putInt(KEY_POSITION, position);
    frag.setArguments(args);

    return(frag);
  }

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setHasOptionsMenu(true);
  }

  @Override
  public View onCreateView(LayoutInflater inflater,
                           ViewGroup container,
                           Bundle savedInstanceState) {
    View result=inflater.inflate(R.layout.editor, container, false);

    editor=(EditText)result.findViewById(R.id.editor);

    return(result);
  }

  @Override
  public void onStart() {
    super.onStart();

    EventBus.getDefault().register(this);

    if (TextUtils.isEmpty(editor.getText())) {
      DatabaseHelper db=DatabaseHelper.getInstance(getActivity());
      db.loadNote(getPosition());
    }
  }

  @Override
  public void onStop() {
    DatabaseHelper.getInstance(getActivity())
      .updateNote(getPosition(),
        editor.getText().toString());

    EventBus.getDefault().unregister(this);

    super.onStop();
  }

  @Override
  public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    inflater.inflate(R.menu.notes, menu);

    super.onCreateOptionsMenu(menu, inflater);
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    if (item.getItemId() == R.id.delete) {
      editor.setText(null);
      getContract().closeNotes();

      return(true);
    }

    return(super.onOptionsItemSelected(item));
  }

  @SuppressWarnings("unused")
  @Subscribe(threadMode =ThreadMode.MAIN)
  public void onNoteLoaded(NoteLoadedEvent event) {
    if (event.getPosition() == getPosition()) {
      editor.setText(event.getProse());
    }
  }

  private int getPosition() {
    return(getArguments().getInt(KEY_POSITION, -1));
  }

  private Contract getContract() {
    return((Contract)getActivity());
  }
}