用相同的片段替换后不再调用 OnCreateView

Question

我正在使用带有工具栏中不同项目的下拉菜单。在活动中，我会在单击菜单项后立即添加片段。片段 OnCreateview 被调用并从 API 中获取数据。所有菜单项的数据获取逻辑保持不变，但只有 API 端点不同。因此，我尝试使用 API 端点名称传递 Bundle，并对所有项目使用相同的片段。但问题是 OnCreateView 仅在第一次被调用，并且请求仅针对第一个片段事务发出，即使我为不同的项目点击替换相同的片段。

Activity.java

    public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
    switch (i) {
        case 0: //Clients
            Bundle bundle1 = new Bundle();
            bundle1.putString("hash-key","item1");
            ReportCategoryFragment rp1 = new ReportCategoryFragment();
            rp1.setArguments(bundle1);
            replaceFragment(rp1,false,R.id.container);
            break;

        case 1:
            Bundle bundle2 = new Bundle();
            bundle2.putString("hash-key","item2");
            ReportCategoryFragment rp2 = new ReportCategoryFragment();
            rp2.setArguments(bundle2);
            replaceFragment(rp2,false,R.id.container);
            break;
      }
     }

报告类别片段

    @Nullable
@Override
public View onCreateView(LayoutInflater inflater,
                         @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    rootView = inflater.inflate(R.layout.fragment_runreport, container, false);
    setHasOptionsMenu(true);
    ButterKnife.bind(this, rootView);
    presenter.attachView(this);
    reportType = getArguments().getString("hash-key");
    Log.v("hashkey",reportType);
    presenter.fetchCategories(reportType, false, true);

    return rootView;
}

替换片段函数

     public void replaceFragment(Fragment fragment, boolean addToBackStack, int containerId) {
    invalidateOptionsMenu();
    String backStateName = fragment.getClass().getName();
    boolean fragmentPopped = getSupportFragmentManager().popBackStackImmediate(backStateName,
            0);

    if (!fragmentPopped && getSupportFragmentManager().findFragmentByTag(backStateName) ==
            null) {
        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
        transaction.replace(containerId, fragment, backStateName);
        if (addToBackStack) {
            transaction.addToBackStack(backStateName);
        }
        transaction.commit();
    }
}

编辑：FragmentnewInstance 方法

     public static ReportCategoryFragment newInstance() {
    ReportCategoryFragment fragment = new ReportCategoryFragment();
    Bundle bundle = new Bundle();
    fragment.setArguments(bundle);
    return fragment;
}

Answer 1

简单的解决方案是使用 Broadcast Receiver 在你的 fragment 类中声明这个

BroadcastReceiver broadCastNewMessage = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
           //extract our message from intent
            String msg_for_me = intent.getStringExtra("some_msg");

        }
    };

现在在onCreate()的片段注册这个

registerReceiver(this.broadCastNewMessage, new IntentFilter("update_fragment"));

在onDestroyView()

unregisterReceiver(broadCastNewMessage);

现在从您要从菜单选择中更新活动的服务类中调用此方法

Intent intent = new Intent("update_fragment");
intent.putExtra("some_msg", message); 
sendBroadcast(intent);

Answer 2

尝试在片段中使用静态方法来创建片段的新实例。

public static Fragment newInstance() 
{
    MyFragment myFragment = new MyFragment();
    return myFragment;
}