Bundle传递对象

public class BundleDemo extends Activity {
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.bundle_activity);
		User user = new User();
		Intent intent = new Intent(this, ActivityA.class);
		Bundle bundle = new Bundle();
		bundle.putSerializable("user", user);
		intent.putExtras(bundle);
		startActivity(intent);
	}
}
class User implements Serializable {
	public ArrayList getList() {
		ArrayList<String> list = new ArrayList<String>();
		list.add("tian1");
		list.add("tian2");
		list.add("tian3");
		list.add("tian4");
		return list;

	}
}

public class ActivityA extends Activity {
	private Button button;
	private String Tag = "yuxlong2010";
	int count = 0;
    private TextView textview;
    User user;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		Log.d(Tag, "I‘m  onCreate");
		setContentView(R.layout.activity_a);
		textview = (TextView) findViewById(R.id.textView1);
		button = (Button) findViewById(R.id.button1);
		Bundle bundle = this.getIntent().getExtras();
		user  = (User) bundle.get("user");
		button.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				//startActivity(new Intent(ActivityA.this,ActivityA.class));
				textview.setText(user.getList().get(0).toString());
			}
		});
	}