Question

我创建了一个基本上具有导航抽屉的应用程序，我希望在活动启动而不是主活动时加载一个片段“ home”。任何想法如何做到。

Answer 1

您可以调用此方法来查看片段。在您的情况下，请在您的onCreate()

上调用此方法

//Fragment Changer
    public void changeFragment(Fragment targetfragment) {
        getSupportFragmentManager()
                .beginTransaction()
                .replace(R.id.content_fragment, targetfragment, "fragment")
                .setTransitionStyle(FragmentTransaction.TRANSIT_FRAGMENT_FADE)
                .addToBackStack(null)
                .commitAllowingStateLoss();
    }

示例用法

 changeFragment(new YourFragment());

Answer 2

基本解决方案可以在您的onCreate方法中实现类似以下代码的内容。

// get fragment manager
FragmentManager fm = getFragmentManager();

// replace
FragmentTransaction ft = fm.beginTransaction();
ft.replace(R.id.main_layout, new HomeFragment());
ft.commit();

Answer 3

您的活动：

public class MainActivity extends AppCompatActivity {
    public static final String TAG = MainActivity.class.getSimpleName();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_activity);
    }

    public String getHelloMessage() {
        return "Hello!";
    }
}

您的视图：

public class MainView extends Fragment {

    // Declarations
    private Button testButton;

    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.main_view, container, false);

        // Getting the reference of controller from Application
        MainController mainController = Application.getInstance().getMainController();

        // Initializing view objects
        testButton = view.findViewById(R.id.test_button);

        // Setting actions
        testButton.setOnClickListener(mainController.getTestAction());

        return view;
    }

    // Reference to the view Object
    public Button getTestButton() {
        return testButton;
    }

您的main_activity.xm l连接片段

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/containerMainView"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <fragment
        android:id="@+id/mainView"
        android:name="com.template.views.MainView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</FrameLayout>

您的main_view.xml文件为您的最终视图定义

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:id="@+id/test_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="@string/say_hello" />
</RelativeLayout>

应用启动时如何加载片段

3 个答案: