Android之---Activity与Fragment之间的传值问题

Activity与Fragment之间的传值问题

Activity传值给Fragment

添加Fragment的Activity：

 Fragment01 fragment = new Fragment01();        Bundle bundle = new Bundle();        bundle.putString("str","这是Activity传来的值");        fragment.setArguments(bundle);        fragmentManager = getFragmentManager();        FragmentTransaction fragmentTransaction=fragmentManager.beginTransaction();        fragmentTransaction.replace(R.id.fm01id,fragment01);        fragmentTransaction.commit();

Fragment中接受Activity传过来的值：

String str = (String)getArguments().get(“str”);

Fragment传值给Activity：

实现思路：
1.在Fragment中写一个回调接口
2.在activity中实现这个回调接口
3.在Fragment中onAttach 方法中得到activity中实现好的 实例化接口对象
4.用接口的对象 进行传值

Activity：

public class MainActivity extends Activity implements CallBackValue{      private TextView tv1;      @Override      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.activity_main);          tv1 = (TextView) findViewById(R.id.tv1);          FragmentManager manager = getFragmentManager();          FragmentTransaction transaction =   manager.beginTransaction();          transaction.add(R.id.contents, new Fragmen1());          transaction.commit();      }      //要获取的值  就是这个参数的值      @Override      public void SendMessageValue(String strValue) {          // TODO Auto-generated method stub          tv1.setText(strValue);      }  } 

Fragment：

public class Fragmen1 extends Fragment{      private Button btn1;      private EditText et1;      CallBackValue callBackValue;      /**      * fragment与activity产生关联是  回调这个方法       */      @Override      public void onAttach(Activity activity) {          // TODO Auto-generated method stub          super.onAttach(activity);          //当前fragment从activity重写了回调接口  得到接口的实例化对象          callBackValue =(CallBackValue) getActivity();      }      @Override      public View onCreateView(LayoutInflater inflater, ViewGroup container,              Bundle savedInstanceState) {          // TODO Auto-generated method stub          View view = inflater.inflate(R.layout.fragment_layout1, container, false);           btn1 = (Button) view.findViewById(R.id.btn1);           et1 = (EditText) view.findViewById(R.id.et1);           btn1.setOnClickListener(new OnClickListener() {              @Override              public void onClick(View v) {                  // TODO Auto-generated method stub                  String strValue = et1.getText().toString().trim();                  callBackValue.SendMessageValue(strValue);              }          });          return view;      }      //定义一个回调接口      public interface CallBackValue{          public void SendMessageValue(String strValue);      }  }