Question

你好我有片段和里面的viewpager有2个标签我需要当我按下父片段中的按钮刷新视图页面内的子片段我使用它来刷新相同的片段，它工作正常

        FragmentTransaction ft1 = getFragmentManager().beginTransaction();
        ft1.detach(this).attach(this).commit();

我尝试了相同而不是这个我把childfragment.newInstance（）放仍然没有刷新所以任何建议？

Answer 1

在子片段中创建一个界面。 RefreshInterface
在子片段中创建一个方法，将对象分配给RefreshInterface。 intialiseRefreshInterface（RefreshInterface refreshInterface）
在刷新点击内调用接口方法。
在Parent片段中实现子片段接口并覆盖该方法。
在commit（）之前从父片段中获取子片段 1.创建一个子对象的对象 2.调用intialiseRefreshInterface（RefreshInterface refreshInterface） 3. commit（）子片段。
您的子片段将刷新[子片段将为popBackStack（）并重新创建。

以下示例代码将帮助您实现您的要求

父级片段

<强> parentFragment.java

    public class OneFragment extends Fragment implements TwoFragment.RefreshInterface {

    TwoFragment child;
    Button launch;
    FrameLayout containerLayout;
    // child fragment interface object
    TwoFragment.RefreshInterface refreshInterface;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_one, container, false);
        launch = view.findViewById(R.id.fragment_launch);
        containerLayout = view.findViewById(R.id.fragment_container);
        // RefreshInterface. this is mandatory
        refreshInterface = this;
        launch.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                launchChildFragment();
            }
        });
        return view;
    }

    @Override
    public void refresh_fragment() {
        // as we added the child fragment to backstack. we will remove the fragment from backstack and add again
        if (getActivity().getSupportFragmentManager().getBackStackEntryCount() > 0){
            getActivity().getSupportFragmentManager().popBackStack();
        }
        launchChildFragment();
    }

    private void launchChildFragment(){
        // creating the object for child fragment
        child = new TwoFragment();
        // intialising the RefreshInterface object
        child.intialiseRefreshInterface(refreshInterface);
        // calling the child fragment
        getActivity().getSupportFragmentManager().beginTransaction().add(R.id.fragment_container, child).addToBackStack(null).commit();
    }
}

<强> fragment_parent.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.myapplication.OneFragment">

    <Button
        android:layout_centerHorizontal="true"
        android:id="@+id/fragment_launch"
        android:text="Launch child fragment"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <FrameLayout
        android:id="@+id/fragment_container"
        android:layout_below="@id/fragment_launch"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</RelativeLayout>

<强> childFragment

public class TwoFragment extends Fragment {

    Button refershBtn;
    RefreshInterface refreshInterface;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_two, container, false);
        refershBtn = view.findViewById(R.id.btn_refersh);

        refershBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                refreshInterface.refresh_fragment();
            }
        });
        return view;
    }

    public void intialiseRefreshInterface(RefreshInterface refreshInterface){
        this.refreshInterface = refreshInterface;
    }

    public interface RefreshInterface {
        void refresh_fragment();
    }
}

<强> fragment_child.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.outthinking.myapplication.TwoFragment">

    <!-- TODO: Update blank fragment layout -->
    <EditText
        android:id="@+id/refersh_tv"
        android:textSize="24sp"
        android:textAlignment="center"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="REFRESH DATA" />

    <Button
        android:id="@+id/btn_refersh"
        android:text="refersh"
        android:layout_centerInParent="true"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</RelativeLayout>

如何使子片段从它的父片段刷新

1 个答案: