android - 如何将消息从fragment发送到activity并在activity中接收和使用？

Question

请不要删除我在谷歌搜索时感到困惑的问题。我用过Android Tab Layout with Swipeable Views在我的代码中，当用户按下 Activity 上的设置按钮时。

现在我需要从 TopRatedFragment.java 发送消息，该消息从 fragment 扩展到调用“具有可滑动 View 的 Android 选项卡布局”的 mainActivity 的 Activity 。

Answer 1

您可以通过实现回调来做到这一点

首先创建一个接口(interface)

public interface CommunicationInterface {

public void onSuccess();

public void onFailed();

}

然后在您的 Activity 中实现接口(interface)

public class YourActivity extends ActionBarActivity implements  CommunicationInterface {

 //default functions
@Override
public void onSuccess() {

  //stuff you want to do in the acivity

}

@Override
public void onFailed() {
   //stuff you want to do in the acivity
}

}

现在在 fragment 中

public class yourfragment extends Fragment {

 CommunicationInterface callback;

 //stuffs that usually come in yor fragment and like OncreateView etc

@Override
public void onActivityCreated(@Nullable Bundle outState) {
    super.onActivityCreated(outState);

   //after all the stuff you want to do in your fragment then implement      //call back function to communicate with the activity
   callback= (CommunicationInterface) getActivity();

    callback.onSuccess();//according to your purpose use where ever you like

    callback.onFailed();//according to your purpose use where ever you like

}


@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
  callback= (CommunicationInterface) activity;
}
}