动态加载的Fragment通信
fragment之间永远不能通信都是通过他们所依附的Activity来通信的，通过接口回调的方式来通信
Activity--->Fragment:在activity中创建Bundle数据包，并调用fragment的setArguments(Bundle bundle)方法
fragment--->Activity:在fragment类中定义一个接口，并在他所属的activity中实现该接口，fragment在他的onAttach()方法执行期间捕获该接口的实现，然后就可以调用该接口方法，以便跟activity通信。
下面的代码实现了在一个Activity下有两个Fragment，在一个Fragment中输入值在另一个Fragment显示
public class MainActivity extends Activity implements MyListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FragmentManager manager = getFragmentManager();
FragmentTransaction fragmentTransaction = manager.beginTransaction();
Fragment1 fragment1 = new Fragment1();
fragmentTransaction.add(R.id.layout1, fragment1);
fragmentTransaction.commit();
}
//在mainActivity中实现MyListener接口并实现它未实现的方法，在该方法中传递数据
@Override
public void send(String info) {
Toast.makeText(this, "Activity成功接收" + info, 0).show();
Fragment2 fragment2 = new Fragment2();
Bundle bundle = new Bundle();
bundle.putString("name", info);
fragment2.setArguments(bundle);
FragmentManager manager = getFragmentManager();
FragmentTransaction fragmentTransaction = manager.beginTransaction();
//替换该Fragment
fragmentTransaction.replace(R.id.layout2, fragment2, "fragment2");
fragmentTransaction.commit();
}
}
上面的MainActivity布局就是添加两个Linearlayout，下面是创建两个Fragment，Fragment1的布局就是一个EditText一个Button，Fragment2的布局就是一个TextView。
public class Fragment1 extends Fragment {
EditText et;
Button enter;
private String info;
@Override
public void onAttach(Activity activity) {
listener = (MyListener) activity;
super.onAttach(activity);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment1_lay,container, false);
et = (EditText) view.findViewById(R.id.et);
enter = (Button) view.findViewById(R.id.enter);
enter.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
info = et.getText().toString();
listener.send(info);
}
});
return view;
}
public MyListener listener;
//定义一个接口
public interface MyListener{
public void send(String info);
}
}
public class Fragment2 extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment2_lay,container, false);
TextView tv = (TextView) view.findViewById(R.id.tv);
tv.setText(getArguments().get("name")+"");//获取传递的值
Toast.makeText(getActivity(), "fragment"+getArguments().get("name")+"", 0).show();
return view;
}
}
