SingleDemoActivity.java

package hk.hku.cs.srli.monkeydemo;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.NavUtils;
import android.view.MenuItem;

import hk.hku.cs.srli.monkeydemo.demo.DemoContent;
import hk.hku.cs.srli.monkeydemo.demo.DemoFragmentBase;
import hk.hku.cs.srli.monkeydemo.demo.DemoContent.DemoItem;

/**
 * An activity representing a single demo screen. This activity is only
 * used on handset devices. On tablet-size devices, item details are presented
 * side-by-side with a list of items in a {@link DemoListActivity}.
 * <p>
 * This activity is mostly just a 'shell' activity containing nothing more than
 * a {@link DemoFragmentBase}.
 */
public class SingleDemoActivity extends Activity {

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

        // Show the Up button in the action bar.
        getActionBar().setDisplayHomeAsUpEnabled(true);

        // savedInstanceState is non-null when there is fragment state
        // saved from previous configurations of this activity
        // (e.g. when rotating the screen from portrait to landscape).
        // In this case, the fragment will automatically be re-added
        // to its container so we don't need to manually add it.
        if (savedInstanceState == null) {
            // Create the detail fragment and add it to the activity
            // using a fragment transaction.
            final String demoId = getIntent().getStringExtra(DemoFragmentBase.ARG_ITEM_ID);
            DemoItem demo = DemoContent.ITEM_MAP.get(demoId);
            setTitle(demo.title);
            DemoFragmentBase fragment = demo.fragment;
            Bundle arguments = new Bundle();
            arguments.putString(DemoFragmentBase.ARG_ITEM_ID, demoId);
            fragment.setArguments(arguments);
            getFragmentManager().beginTransaction()
                    .add(R.id.single_demo, fragment)
                    .commit();
        }
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                // This ID represents the Home or Up button. In the case of this
                // activity, the Up button is shown. Use NavUtils to allow users
                // to navigate up one level in the application structure. For
                // more details, see the Navigation pattern on Android Design:
                NavUtils.navigateUpTo(this, new Intent(this, DemoListActivity.class));
                return true;
        }
        return super.onOptionsItemSelected(item);
    }
}