Android 后挡板不起作用

我正在尝试创建一个android wear应用程序，它只有一个活动，其中有一个片段。我希望能够根据按钮单击或其他用户操作切换出片段

我可以很好地替换碎片；但是，当我从屏幕左侧滑动到屏幕右侧时。应用程序关闭。我希望这个滑动像一个后退按钮，而不是退出应用程序

主要活动

import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import  android.support.v4.app.FragmentTransaction;
import android.support.wearable.view.WatchViewStub;


public class MainActivity extends FragmentActivity implements FragmentChangeListener {

    int  fragmentContainerId;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_activity);
        final WatchViewStub stub = (WatchViewStub)findViewById(R.id.watch_view_stub);


        // instialize the fragment to the loading page
        stub.setOnLayoutInflatedListener(new WatchViewStub.OnLayoutInflatedListener() {
            @Override
            public void onLayoutInflated(WatchViewStub watchViewStub) {
                fragmentContainerId =  R.id.fragmentContainer;

                if (watchViewStub.findViewById(R.id.fragmentContainer) != null) {




                    Fragment1 fragment1= new Fragment1 ();

                    // In case this activity was started with special instructions from an Intent,
                    // pass the Intent's extras to the fragment as arguments
                    fragment1.setArguments(getIntent().getExtras());

                    // Add the fragment to the 'fragment_container'
                    FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
                    fragmentTransaction.add(R.id.fragmentContainer, fragment1).addToBackStack(null);
                    fragmentTransaction.commit();
                }
            }
        });
    }

    @Override
    public void replaceFragment(Fragment fragment) {
        FragmentManager fragmentManager = getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.replace(R.id.fragmentContainer, fragment, fragment.toString()).addToBackStack(null);
        System.out.println("Entry count in backstack is: " + fragmentManager.getBackStackEntryCount());
        fragmentTransaction.commit();
    }
}

片段1

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;



public class Fragment1 extends Fragment {


    public Fragment1() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment1,
                container, false);

        Button button1= (Button)view.findViewById(R.id.button1);

        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Fragment2 fragment2= new Fragment2 ();
                FragmentChangeListener fc=(FragmentChangeListener)getActivity();
                fc.replaceFragment(fragment2);
            }
        });
        return view;
    }
}

片段2

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;


/**
 * A simple {@link Fragment} subclass.
 */
public class Fragment2 extends Fragment {


    public Fragment2() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View v =inflater.inflate(R.layout.fragment2, container, false);

        return v;
    }


}

FragmentChangeListner

import android.support.v4.app.Fragment;


public interface FragmentChangeListener
{
    public void replaceFragment(Fragment fragment);
}

---

当我通过按钮从Fragment1导航到Fragment2时，单击。如果不退出应用程序，我如何导航到碎片1？

，如果你考虑使用类，那么你可以使用一个潜在的棘手的解决方案。它允许您向后滑动以查看以前的内容。您必须在滑动时刷新视图以模拟动态后退，但这是可以做到的。

一个解决方案是将第二个布局包装在

android.support.wearable.view.SwipedSmissFrameLayout

然后，您可以在父活动调用

getFragmentManager（）.popbackbackstack（）中捕获dismise手势

您可以在SwipedSmissFrameLayout上设置侦听器，如下所示：
swipeFrame.setDismissEnabled（true）；
swipeFrame.setOnDismissedListener（新的SwipeDismissLayout.OnDismissedListener（）{
@凌驾
公共空间布局（SwipedSmissLayout SwipedSmissLayout）{
getActivity（）.getFragmentManager（）.popBackStack（）；
}
});
您找到解决方案了吗？是否可以在被刷走的片段后面显示上一个片段？就像它是如何与活动一起工作的。