Question

我已经好好打了几天，试图找出如何更好地处理片段交互，以便事件只触发一次。基本上我有一个主活动，它包含一个主要的片段容器。该主容器容纳另外三个容器碎片（柱子）。然后，这三个片段中的每一个都包含各种其他子片段，如下所示。

Default layout

当我单击其中一个子片段时，主要活动获取片段管理器并用单击的片段替换单个主片段容器;基本上它正在拍摄片段并使其全屏显示。

Child Fragment clicked fullscreen

我遇到的问题是，在子片段全屏后，片段中的任何额外点击都会创建后续片段。因此，如果我单击全屏片段4次，我最终得到5个片段视图;来自主要活动＆amp;的初始点击4个重复。

TL / DR - 问题：如何在片段全屏后阻止片段自行替换？

MFDTailboard.java

public class MFDTailboard extends Activity implements Calendar.OnFragmentInteractionListener,
    ....
    public void onCalendarFragmentInteraction(Uri uri) {
        getFragmentManager().beginTransaction()
            .replace(R.id.MFDTailboardContainer, Calendar.newInstance("Calendar Fragment", "CalFrag"))
            .addToBackStack("Fullscreen Calendar")
            .commit();
    }

Calendar.java

public class Calendar extends Fragment implements TextView.OnClickListener {
....
        @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        View view = inflater.inflate(R.layout.fragment_calendar, container, false);

        nextScheduledDate = (TextView) view.findViewById(R.id.NextScheduledDate);
        nextScheduledDate.setOnClickListener(this);
        // Inflate the layout for this fragment
        return view;
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        try {
            mListener = (OnFragmentInteractionListener) activity;
        } catch (ClassCastException e) {
            throw new ClassCastException(activity.toString()
                    + " must implement OnFragmentInteractionListener");
        }
    }

    public void onClick(View v) {
            mListener.onCalendarFragmentInteraction(null);
    }

    /**
     * This interface must be implemented by activities that contain this
     * fragment to allow an interaction in this fragment to be communicated
     * to the activity and potentially other fragments contained in that
     * activity.
     * <p/>
     * See the Android Training lesson <a href=
     * "http://developer.android.com/training/basics/fragments/communicating.html"
     * >Communicating with Other Fragments</a> for more information.
     */
    public interface OnFragmentInteractionListener {
            // TODO: Update argument type and name
            public void onCalendarFragmentInteraction(Uri uri);
    }

布局activity_mfdtailboard.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/MFDTailboardContainer"
android:layout_width="fill_parent"
android:layout_height="fill_parent">

</RelativeLayout>

布局fragment_calendar_callback_container（3列中的第1列）

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/FragmentContainer"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:background="@android:color/darker_gray"
android:orientation="vertical"
android:weightSum="2"
tools:context=".fragments.CalendarCallback">

</LinearLayout>

布局fragment_calendar.xml（全屏/子片段）

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/calendar_fragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_margin="1dp"
    android:layout_weight="1"
    android:background="@android:color/white"
    android:orientation="vertical"
    android:gravity="center_vertical">

    <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="@string/calendar_header"
            android:id="@+id/calendar_header"
            android:layout_weight="0"
            android:gravity="center_horizontal"
            android:background="@android:color/background_dark"
            android:textColor="@android:color/primary_text_dark"
            android:textSize="18sp" />

    <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:layout_weight="1">

            <TextView
                    android:id="@+id/NextScheduledLabel"
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:text="@string/next_scheduled_label"
                    android:textSize="24sp" />

            <LinearLayout
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:gravity="right"
                    android:orientation="vertical">

                    <TextView
                            android:id="@+id/RemainingLabel"
                            android:layout_width="wrap_content"
                            android:layout_height="match_parent"
                            android:text="@string/remaining_label"
                            android:textSize="18sp" />

                    <TextView
                            android:id="@+id/RemainingCount"
                            android:layout_width="match_parent"
                            android:layout_height="match_parent"
                            android:gravity="center"
                            android:text="@string/remaining_count"
                            android:textSize="30sp" />
            </LinearLayout>

    </LinearLayout>

    <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:layout_weight="1">

            <TextView
                    android:id="@+id/NextScheduledDate"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center_horizontal"
                    android:text="@string/next_scheduled_day"
                    android:textSize="102sp" />

            <TextView
                    android:id="@+id/NextScheduledMonth"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center_horizontal"
                    android:text="@string/next_scheduled_month"
                    android:textSize="36sp"
                    android:layout_marginTop="-20dp" />
    </LinearLayout>

    <View
            android:id="@+id/HorizontalLine"
            android:layout_width="wrap_content"
            android:layout_height="1dp"
            android:background="@android:color/black" />

    <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:baselineAligned="false"
            android:orientation="horizontal"
            android:layout_weight="1">

            <LinearLayout
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:layout_weight="1"
                    android:gravity="center"
                    android:orientation="vertical">

                    <TextView
                            android:id="@+id/CycleFirstDate"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:text="@string/cycle_first_date"
                            android:textSize="30dp" />

                    <TextView
                            android:id="@+id/CycleFirstDay"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:text="@string/cycle_first_day"
                            android:textSize="18dp" />

            </LinearLayout>

            <LinearLayout
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:layout_weight="1"
                    android:gravity="center"
                    android:orientation="vertical">

                    <TextView
                            android:id="@+id/CycleSecondDate"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:text="@string/cycle_second_date"
                            android:textSize="30dp" />

                    <TextView
                            android:id="@+id/CycleSecondDay"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:text="@string/cycle_second_day"
                            android:textSize="18dp" />

            </LinearLayout>

            <LinearLayout
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:layout_weight="1"
                    android:gravity="center"
                    android:orientation="vertical">

                    <TextView
                            android:id="@+id/CycleThirdDate"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:text="@string/cycle_third_date"
                            android:textSize="30dp" />

                    <TextView
                            android:id="@+id/CycleThirdDay"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:text="@string/cycle_third_day"
                            android:textSize="18dp" />

            </LinearLayout>

    </LinearLayout>

提前感谢您的帮助！

Answer 1

也许您可以将片段实例保存在数组中，如下所示：

Fragment[] myFragments = {
    new Fragment1(),
    new Fragment2(),
    ...
};

然后你可以通过调用changeFragment(myFragments[i])

来交换它们

public void changeFragment(Fragment fragment){
    if(null != fragment && fragment != actualFragment){
        FragmentTransaction ft = getActivity().getFragmentManager().beginTransaction();
        ft.replace(R.id.container, fragment);
        ft.addToBackStack(null);
        ft.commit();
    }
}

希望它有效。

最好的问候。

如何防止重复碎片？

1 个答案: