Fragment中的FragmentTransaction

Question

我是这个编程世界的新人，所以我想这个问题很简单。所以我的片段上有一个图像按钮，我想要的是当我点击它时，它会对另一个片段进行片段事务处理;但问题是，当我运行应用程序并单击图像按钮时，它只会＆＃34;叠加＆＃34;将另一个片段的内容放入图像按钮所在的那个，当然我要做的只是去另一个片段，我已经处理了一段时间，所以我希望有人帮助我，谢谢。

这是片段

的java代码

public class inicio extends Fragment {

    public inicio() {
    }


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

        ImageButton luces = (ImageButton)view.findViewById(R.id.imageButton);

        luces.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                interior interior= new interior();
                FragmentManager fragmentManager = getActivity().getSupportFragmentManager();
                FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
                fragmentTransaction.replace(R.id.inicioo, interior).commit();    

            }
        });
   }
}

新增代码......

public class transaction extends MainActivity
        implements com.example.administradora.prueba.inicio.OnSelectedListener{


    public void onButtonSelected() {
        interior interior= new interior();
        getSupportFragmentManager().beginTransaction().replace(R.id.inicioo, interior).commit();
    }
}

但是我在logcat中得到了这个错误：

java.lang.RuntimeException：无法启动活动ComponentInfo {com.example.administradora.prueba / com.example.administradora.prueba.MainActivity}：java.lang.ClassCastException：com.example.administradora.prueba.MainActivity @ 20f8fe9b必须实现OnSelectedListener

Answer 1

您不应该从另一个片段替换片段。尝试通过活动来做到这一点。

为Fragment定义一些接口

public class MyFragment extends Fragment {
    OnSelectedListener mCallback;

    // Container Activity must implement this interface
    public interface OnSelectedListener {
        public void onButtonSelected();
    }

    @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 {
            mCallback = (OnSelectedListener ) activity;
        } catch (ClassCastException e) {
            throw new ClassCastException(activity.toString()
                    + " must implement OnSelectedListener");
        }
    }

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

        ImageButton luces = (ImageButton)view.findViewById(R.id.imageButton);

        luces.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // Send the event to the host activity
                if (mCallback != null) mCallback.onButtonSelected();
            }
        });

        return view;
   }
}

并从Activity中交换接口实现中的Fragment容器。

public class MainActivity extends Activity
        implements MyFragment.OnSelectedListener{
    ...

    public void onButtonSelected() {
        interior interior= new interior();
        getSupportFragmentManager()
            .beginTransaction()
            .replace(R.id.inicioo, interior)
            .commit();    
    }
}

Communicating with Other Fragments的前两部分正是您要找的。