java - 如何使子片段从其父片段中刷新

Question

你好，我有片段，里面有两个标签，当我按下父片段中的按钮时，我需要刷新视图页面中的子片段，我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();

我尝试了同样的方法，而不是这个，我放了 childfragment.newInstance() 仍然没有刷新所以有什么建议吗？

标签： javaandroidfragmentmanager

Answer 1

1. 在您的子片段中创建一个界面。刷新界面

2. 在子片段中创建一个方法以将对象分配给 RefreshInterface。初始化刷新接口（刷新接口刷新接口）

3. 调用刷新点击里面的接口方法。

4. 在父片段中实现子片段接口并覆盖该方法。

5. 在 commit() 之前来自父片段的子片段 1. 为子对象创建一个对象 2. 调用 intialiseRefreshInterface(RefreshInterface refreshInterface) 3. commit() 子片段。

6. 您的子片段将刷新 [子片段将 popBackStack() 并重新创建。

下面的示例代码将帮助您实现您的要求

父片段

父片段.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();
    }
}

片段父.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>

子片段

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();
    }
}

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>