Java 如何访问片段并将其更改为主要活动

我有一个

Activity Main

类和

XML

，还有

ana_sayfa

（

Fragment

）类和

XML

当我滑动屏幕并显示

ana_sayfa

时，我想将项目添加到可扩展的列表视图中，但我无法将

ana_sayfa

片段访问到主活动类中

主要活动类别：

---

使用

setArguments（Bundle）

将数据传递给片段，并使用

getArguments（）

在

onCreateView（）中检索数据。然后片段可以处理列表视图中呈现数据的所有逻辑。
您可以使用
接口
在活动和片段之间进行通信。例如，在片段类中，可以添加：

public class F_ana_sayfa extends Fragment {

    ...

    SomeInterface myInterface;

    // Container activity must implement this interface
    public interface SomeInterface {
        // You can define your interface functions here
        void doSomething();
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        // This makes sure that the container activity has implemented
        // the callback interface. If not, it throws an exception
        try {
            myInterface = (SomeInterface) activity;
        } catch (ClassCastException e) {
            throw new ClassCastException(activity.toString() + " must implement SomeInterface");
        }
    }

    public void someFunction(boolean someBoolean) {
        if (someBoolean) {
            // Calling the interface function
            myInterface.doSomething();
        }
    }
}

现在，您的活动必须实现fragment类中定义的接口。
例如：

public class MainActivity extends AppCompatActivity implements F_ana_sayfa.SomeInterface {

    ...

    public void doSomething() {
        // Your code here
    }
}

欲了解更多信息，请访问

public class F_ana_sayfa extends Fragment {

    ...

    SomeInterface myInterface;

    // Container activity must implement this interface
    public interface SomeInterface {
        // You can define your interface functions here
        void doSomething();
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        // This makes sure that the container activity has implemented
        // the callback interface. If not, it throws an exception
        try {
            myInterface = (SomeInterface) activity;
        } catch (ClassCastException e) {
            throw new ClassCastException(activity.toString() + " must implement SomeInterface");
        }
    }

    public void someFunction(boolean someBoolean) {
        if (someBoolean) {
            // Calling the interface function
            myInterface.doSomething();
        }
    }
}

public class MainActivity extends AppCompatActivity implements F_ana_sayfa.SomeInterface {

    ...

    public void doSomething() {
        // Your code here
    }
}