1.Activity->Fragment
使用Bundle将数据通过setArgument方法传入实例化的Fragment，在Fragment启动时将其传入，在Fragment中调用getArgument方法获得Bundle，再从Bundle中提取数据
String text = editext.getText().toString();
MyFragment5 fragment5 = new MyFragment5();
Bundle bundle = new Bundle();
bundle.putString("name", text);
fragment5.setArguments(bundle);
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction beginTransaction = fragmentManager
.beginTransaction();
beginTransaction.add(R.id.layout, fragment5, "fragment5");
beginTransaction.commit();
2.Fragment->Activity
在自定义Fragment中定义接口，在接口中定义回传数据的函数，将想要回传的数值的数据类型作为参数
Activity继承该接口，并重写回传数据函数，获得Activity所请求的数据并对其操作
在Fragment的OnCreateView方法中调用该回传数据函数，将希望传回Activity的数据作为参数写入回传数据函数，该回传数据函数回调Activity中重写的回传数据函数，对Activity进行操作
——即：在Fragment中定义回调接口，在包含Fragment的Activity中实现接口，Fragment可调用该回调方法将数据回传给Activity
public class MyFragment5 extends Fragment{
private String code="have received!";
public MyListener listener;
//定义MyListener接口
public interface MyListener
{
public void refunc(String code);
}
@Override
public void onAttach(Activity activity) {
// TODO Auto-generated method stub
listener=(MyListener) activity;
super.onAttach(activity);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View view = inflater.inflate(R.layout.fragment2, container, false);
TextView tv = (TextView) view.findViewById(R.id.text);
String text=getArguments().get("name").toString();
tv.setText(text);
Toast.makeText(getActivity(), "已成功接收到"+text, Toast.LENGTH_SHORT).show();
Toast.makeText(getActivity(), "向Activity发送"+code, Toast.LENGTH_SHORT).show();
//通过接口的方法回调Activity中重写的方法，向Activity传递数值
listener.refunc(code);
return view;
}
}
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main4);
editext = (EditText) findViewById(R.id.editText);
send = (Button) findViewById(R.id.send);
send.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String text = editext.getText().toString();
//通过Bundle将数据传入fragment
MyFragment5 fragment5 = new MyFragment5();
Bundle bundle = new Bundle();
bundle.putString("name", text);
fragment5.setArguments(bundle);
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction beginTransaction = fragmentManager
.beginTransaction();
beginTransaction.add(R.id.layout, fragment5, "fragment5");
beginTransaction.commit();
Toast.makeText(MainActivity4.this, "向Fragment发送数据" + text,
Toast.LENGTH_SHORT).show();
}
});
FragmentManager fragmentManager = getFragmentManager();
Fragment findFragmentById = fragmentManager.findFragmentById(R.id.frag);
MyFragment frag=(MyFragment) findFragmentById;
frag.setAaa("fragment静态传值");
}
@Override
public void refunc(String code) {
// TODO Auto-generated method stub
Toast.makeText(MainActivity4.this, "已成功接收到" + code ,
Toast.LENGTH_SHORT).show();
}
}
3.生命周期
4.Fragment事物管理
FragmentManager类：
通过finfFragmentById或findFragmentByTag获取对应的Fragment
调用popBackStack将Fragment从后台栈弹出（模拟用户按下back）
FragmentTransaction类：
添加，删除，替换Fragment。在操作确定后通过commit方法提交事务
可在调用commit之前通过addToBackStack将事务加入back栈，允许用户回退到前一个Fragment状态
