Android用另一个片段替换当前片段

Question

我刚开始为 HoneyComb 设计片段。我创建了两个片段。当我单击左侧片段中的按钮时，会在右侧创建一个新片段。同时，当我单击右侧片段中的按钮时（即，我下面代码中的 DetialsFragment 应该被另一个片段替换。 main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
    <fragment class="com.fragment.example.Titles"
        android:id="@+id/titles" android:layout_weight="1"
        android:layout_width="0px"
        android:layout_height="match_parent" />
    <FrameLayout android:id="@+id/details" android:layout_weight="1"
        android:layout_width="0px"
        android:layout_height="match_parent" />

</LinearLayout>

FragmentExample.java

public class FragmentExample extends Activity {
/** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
}

Titles.java

public class Titles extends Fragment {
    public FragmentTransaction ft;
    @Override
    public View onCreateView(LayoutInflater inflater,
        ViewGroup container, Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.main1, null);
        Button button1 = (Button)v.findViewById(R.id.button1);
        button1.setText("santhosh");
        button1.setOnClickListener(new OnClickListener() {



            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                 DetailsFragment details = (DetailsFragment)
                            getFragmentManager().findFragmentById(R.id.details);
                    if (details == null || details.getShownIndex() != 1) {
                        // Make new fragment to show this selection.
                        details = DetailsFragment.newInstance(1);

                        // Execute a transaction, replacing any existing
                        // fragment with this one inside the frame.
                        ft
                                = getFragmentManager().beginTransaction();
                        ft.add(R.id.details, details, "detail");
                        ft.setTransition(
                                FragmentTransaction.TRANSIT_FRAGMENT_FADE);
                        ft.commit();
                    }
            }

        });
        return v;
    }
}

DetailsFragment.java

public class DetailsFragment extends Fragment {
    /**
     * Create a new instance of DetailsFragment, initialized to
     * show the text at 'index'.
     */
    Titles title = new Titles();
    String[] titles = {"Title1", "Title2", "Title3", "Title4"};
    public static DetailsFragment newInstance(int index) {
        DetailsFragment f = new DetailsFragment();

        // Supply index input as an argument.
        Bundle args = new Bundle();
        args.putInt("index", index);
        f.setArguments(args);

        return f;
    }

    public int getShownIndex() {
        return getArguments().getInt("index", 0);
    }

    @Override
    public View onCreateView(LayoutInflater inflater,
        ViewGroup container, Bundle savedInstanceState) {
        if (container == null) {
            // Currently in a layout without a container, so no
            // reason to create our view.
            return null;
        }
        Button button = new Button(getActivity());
        button.setText("Next");
        button.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
            }
        });
        return button;
    }
}

Answer 1

然后，如果您的按钮正在显示并且点击事件被触发，您可以在您的点击事件中调用以下内容：

final FragmentTransaction ft = getFragmentManager().beginTransaction(); 
ft.replace(R.id.details, new NewFragmentToReplace(), "NewFragmentTag"); 
ft.commit(); 

如果您想在单击返回时返回 DetailsFragment，请确保将上述事务添加到后台堆栈，即

ft.addToBackStack(null);

或者我错过了什么？或者，有些人建议您的活动获取按钮的单击事件，并负责替换详细信息窗格中的片段。

Answer 2

最新动态

好的。所以这是一个非常古老的问题，从那时起就有很好的答案。但从那以后发生了很多变化。

现在，在 2020 年，如果您正在使用 Kotlin 并想要更改片段，那么您可以执行以下操作。

1. 将片段的 Kotlin 扩展添加到您的项目中。

在您的应用级别build.gradle 文件中添加以下内容，

dependencies {
    def fragment_version = "1.2.5"

    // Kotlin
    implementation "androidx.fragment:fragment-ktx:$fragment_version"
    // Testing Fragments in Isolation
    debugImplementation "androidx.fragment:fragment-testing:$fragment_version"
}

1. 然后用简单的代码替换片段，

在你的活动中

supportFragmentManager.commit {
    replace(R.id.frame_layout, YourFragment.newInstance(), "Your_TAG")
    addToBackStack(null)
}

参考文献

Check latest version of Fragment extension

More on Fragments

Answer 3

你可以试试下面的代码。从旧片段推送新片段是非常简单的方法。

private int mContainerId;
private FragmentTransaction fragmentTransaction;
private FragmentManager fragmentManager;
private final static String TAG = "DashBoardActivity";

public void replaceFragment(Fragment fragment, String TAG) {

    try {
        fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.replace(mContainerId, fragment, tag);
        fragmentTransaction.addToBackStack(tag);
        fragmentTransaction.commitAllowingStateLoss();

    } catch (Exception e) {
        // TODO: handle exception
    }

}

Answer 4

在您的代码中使用 android.support.v4.app 来表示 FragmentManager 和 FragmentTransaction，它对我有用。

DetailsFragment detailsFragment = new DetailsFragment();
android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
android.support.v4.app.FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.details,detailsFragment);
fragmentTransaction.commit();

Answer 5

如果您有一个现有片段的句柄，您可以将其替换为片段的 ID。

Kotlin 中的示例：

fun aTestFuction() {
   val existingFragment = MyExistingFragment() //Get it from somewhere, this is a dirty example
   val newFragment = MyNewFragment()
   replaceFragment(existingFragment, newFragment, "myTag")
}

fun replaceFragment(existing: Fragment, new: Fragment, tag: String? = null) {
    supportFragmentManager.beginTransaction().replace(existing.id, new, tag).commit()
}

Answer 6

更新的答案（同样适用于重叠问题）

@aniket-thakur(https://stackoverflow.com/users/2396539/aniket-thakur) 给出了正确答案。谢谢你！

但是，getFragmentManager() 已被弃用，所以下面的代码确实对我有用。

final FragmentTransaction ft = getParentFragmentManager().beginTransaction();
                ft.replace(R.id.nav_host_fragment, new GalleryFragment(), "NewFragmentTag");
                ft.addToBackStack(null);
                ft.commit();

Answer 7

用 Fragment 替换很简单。

DataFromDb changeActivity = new DataFromDb();
    FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
    transaction.replace(R.id.changeFrg, changeActivity);
    transaction.commit();