NoteListActivity.java

package com.dropbox.examples.notes;

import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;

import com.dropbox.sync.android.DbxPath;

public class NoteListActivity extends FragmentActivity
        implements NoteListFragment.Callbacks {

    private boolean mTwoPane;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_note_list);

        if (findViewById(R.id.note_detail_container) != null) {
            mTwoPane = true;
            ((NoteListFragment) getSupportFragmentManager()
                    .findFragmentById(R.id.note_list))
                    .setActivateOnItemClick(true);
        }
    }

    @Override
    public void onItemSelected(DbxPath path) {
        if (mTwoPane) {
            NoteDetailFragment fragment = NoteDetailFragment.getInstance(path);
            getSupportFragmentManager().beginTransaction()
                    .replace(R.id.note_detail_container, fragment)
                    .commit();

        } else {
            Intent detailIntent = new Intent(this, NoteDetailActivity.class);
            detailIntent.putExtra(NoteDetailActivity.EXTRA_PATH, path.toString());
            startActivity(detailIntent);
        }
    }
}