NoteDetailActivity.java

package com.dropbox.examples.notes;

import android.annotation.TargetApi;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.NavUtils;
import android.view.MenuItem;

import com.dropbox.sync.android.DbxPath;

public class NoteDetailActivity extends FragmentActivity {

    public static final String EXTRA_PATH = "path";

    @TargetApi(11)
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_note_detail);

        if (Build.VERSION.SDK_INT >= 11) {
            getActionBar().setDisplayHomeAsUpEnabled(true);
        }

        if (savedInstanceState == null) {
            String path = getIntent().getStringExtra(EXTRA_PATH);
            NoteDetailFragment fragment = NoteDetailFragment.getInstance(new DbxPath(path));
            getSupportFragmentManager().beginTransaction()
                    .add(R.id.note_detail_container, fragment)
                    .commit();
        }
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (item.getItemId() == android.R.id.home) {
            NavUtils.navigateUpTo(this, new Intent(this, NoteListActivity.class));
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}