MainActivity.java

package com.google.mcommerce.sample.android.chapter13.frame;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.TextView;

import com.google.mcommerce.sample.android.R;

public class MainActivity extends Activity {

	private final static String L = "MainActivity";

	// Initialize this in onCreateOptions
	Menu myMenu = null;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.c13_frame_main);
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// call the parent to attach any system level menus
		super.onCreateOptionsMenu(menu);

		this.myMenu = menu;

		MenuInflater mi = this.getMenuInflater();
		mi.inflate(R.menu.c13_menu_frame, menu);

		return true;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		try {
			handleMenus(item);
		} catch (Throwable t) {
			Log.d(this.L, t.getMessage(), t);
			throw new RuntimeException("error", t);
		}
		// should return true if the menu item
		// is handled
		return true;

		// If it is not our menu item
		// let the base class handle it
		// return super.onOptionsItemSelected(item);

	}

	private void handleMenus(MenuItem item) {
		this.appendMenuItemText(item);
		if (item.getItemId() == R.id.menu_clear) {
			this.emptyText();
		} else if (item.getItemId() == R.id.menu_list_animation) {
			Intent intent = new Intent(this, FrameAnimationActivity.class);
			startActivity(intent);
		}
	}

	private TextView getTextView() {
		TextView tv = (TextView) this.findViewById(R.id.textViewId);
		return tv;
	}

	public void appendText(String text) {
		TextView tv = (TextView) this.findViewById(R.id.textViewId);
		tv.setText(tv.getText() + text);
	}

	public void appendMenuItemText(MenuItem menuItem) {
		String title = menuItem.getTitle().toString();
		TextView tv = (TextView) this.findViewById(R.id.textViewId);
		tv.setText(tv.getText() + "\n" + title + ":" + menuItem.getItemId());
	}

	private void emptyText() {
		TextView tv = (TextView) this.findViewById(R.id.textViewId);
		tv.setText("");
	}

}// eof-class