public class MainActivity extends Activity {

Button show ,show2;
FragmentManager fragmentManager;
FragmentTransaction fragmentTransaction;
MyFragment fragment;
MySecondFragment mysecondfragment;


//fragment的載入可以使用id來載入，也可以使用tag來載入，在xml中給fragment中加一個tag，然後在fragmentManager.findFragmentByTag(tag)來找到。
//fragment中的button可以使用fragment的方法fragment.getView().findViewById(id)來獲取fragment中的控制元件。
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
fragment = new MyFragment();

mysecondfragment=new  MySecondFragment();
show = (Button) findViewById(R.id.click);
show2 = (Button) findViewById(R.id.click2);
show.setOnClickListener(new View.OnClickListener() {


@Override
public void onClick(View v) {
fragmentManager = getFragmentManager();
fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.add(R.id.right, fragment);
fragmentTransaction.commit();
}
});
show2.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
fragmentManager = getFragmentManager();

fragmentTransaction = fragmentManager.beginTransaction();   //開啟事物
fragmentTransaction.replace(R.id.right, mysecondfragment);
fragmentTransaction.commit();                               //提交事物
}
});


}
}