Question

我遇到了这个问题。我正在用滑动切换片段。

向左滑动

：

public void nextFragment() {
    if(collection.iterator(). hasNext()){
        String fragmentNameToHide = collection.iterator().current();
        String fragmentNameToShow = collection.iterator().next();
        Fragment fragmentToShow = null;
        if((fragmentToShow=fragmentManager.findFragmentByTag(fragmentNameToShow))==null){
            Class<?> className=null;
            try {
                className = Class.forName(fragmentNameToShow);
                Constructor<?> constructor = className.getConstructor();
                Object object = constructor.newInstance();
                fragmentToShow = (Fragment) object;
            } catch (ClassNotFoundException e) {
                e.printStackTrace();
            } catch (NoSuchMethodException e) {
                e.printStackTrace();
            } catch (IllegalArgumentException e) {
                e.printStackTrace();
            } catch (InstantiationException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            } catch (InvocationTargetException e) {
                e.printStackTrace();
            }

        }
        FragmentTransaction ft = fragmentManager.beginTransaction();
        ft.setCustomAnimations(R.animator.slide_in_right, R.animator.slide_out_left);
        Fragment fragmentToHide = fragmentManager.findFragmentByTag(fragmentNameToHide);
        ft.add(R.id.fragment_container, fragmentToShow, fragmentNameToShow);
        ft.show(fragmentToShow);
        ft.hide(fragmentToHide);
        ft.commitAllowingStateLoss();

    }
}

向右滑动

：

public boolean prevFragment() {
    if(collection.iterator().isLast()){
        Log.i("prv", "son");
        String fragmentNameToRemove = collection.iterator().current();
        String fragmentNameToShow = collection.getFragmentList().get(0);
        Fragment fragmentToShow = fragmentManager.findFragmentByTag(fragmentNameToShow);
        Fragment fragmentToRemove2 = fragmentManager.findFragmentByTag(collection.getFragmentList().get(1));
        FragmentTransaction ft = fragmentManager.beginTransaction();
        ft.setCustomAnimations(R.animator.slide_in_left, R.animator.slide_out_right);
        Fragment fragmentToRemove = fragmentManager.findFragmentByTag(fragmentNameToRemove);
        ft.hide(fragmentToRemove);
        ft.hide(fragmentToRemove2);
        ft.show(fragmentToShow);
        ft.commit();
        collection.iterator().setPosition(0);
        Delict.getInstance().releaseDelict();

        return false;
    }else{
        Log.i("prv", "son değil");
        if (collection.iterator().hasPrev()) {
            String fragmentNameToRemove = collection.iterator().current();
            String fragmentNameToShow = collection.iterator().prev();
            Fragment fragmentToShow = fragmentManager.findFragmentByTag(fragmentNameToShow);
            FragmentTransaction ft = fragmentManager.beginTransaction();
            ft.setCustomAnimations(R.animator.slide_in_left, R.animator.slide_out_right);
            Fragment fragmentToRemove = fragmentManager.findFragmentByTag(fragmentNameToRemove);
            ft.show(fragmentToShow);
            ft.hide(fragmentToRemove);
            ft.commit();
            return true;
        }else{
            android.os.Process.killProcess(android.os.Process.myPid());
            return false;
        }
    }
}

以下是我的代码：我的主要活动：

public class DelictActivity extends Activity implements SimpleGestureListener {
private SimpleGestureFilter detector;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_delict);
    detector = new SimpleGestureFilter(this,this, getFragmentManager());
    if(getResources().getConfiguration().orientation==Configuration.ORIENTATION_PORTRAIT){
        Fragment fragment = null;
        FragmentTransaction ft =  getFragmentManager().beginTransaction();
        if((fragment=getFragmentManager().findFragmentByTag("com.example.PlateFragment"))==null){
            PlateFragment plate = new PlateFragment();
            ft.add(R.id.fragment_container, plate, "com.example.PlateFragment");
            ft.show(plate);
        }else{
            ft.show(fragment);
        }
        ft.commit();
    }
}

@Override
public boolean dispatchTouchEvent(MotionEvent me){
   this.detector.onTouchEvent(me);
   return super.dispatchTouchEvent(me);
}

}

我的第一个片段：

public class PlateFragment extends Fragment {
public PlateFragment() {
}
Button enterPlate;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_plate, null);

    enterPlate = (Button) view.findViewById(R.id.openPlateLayer);
    enterPlate.setOnClickListener(openPlateLayerListener);
    return view;
}

OnClickListener openPlateLayerListener = new OnClickListener() {

    @Override
    public void onClick(View v) {
        PlateDialogFragment newFragment = PlateDialogFragment.newInstance();
        newFragment.addListener(dialogFragmentListener);
        newFragment.show(getFragmentManager(),"dialog");

    }
};
DialogFragmentListener dialogFragmentListener = new DialogFragmentListener() {

    @Override
    public void onSuccess() {
        Delict delict =Delict.getInstance();
        enterPlate.setText(delict.getPlate());
    }
};

}

我的第二个片段：

public class CategoryFragment extends Fragment {
public CategoryFragment() {
}
TextView text;
View view;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    view = inflater.inflate(R.layout.fragment_category, null);
    Button categoryLayerButton = (Button) view.findViewById(R.id.selectCategory);
    categoryLayerButton.setOnClickListener(categoryLayerButtonListener);
    text = (TextView) view.findViewById(R.id.text);
    return view;
}
OnClickListener categoryLayerButtonListener = new OnClickListener() {

    @Override
    public void onClick(View v) {
        CategoryDialogFragment newFragment = CategoryDialogFragment.newInstance();
        newFragment.addListener(dialogFragmentListener);
        newFragment.show(getFragmentManager(),"dialog");

    }
};

DialogFragmentListener dialogFragmentListener = new DialogFragmentListener() {

    @Override
    public void onSuccess() {
        Delict delict = Delict.getInstance();
        if(delict.getCategoryList().size()>1){
            text.setText("ihlallerini yaptı;");
        }else if(delict.getCategoryList().size()==1){
            text.setText("ihlalini yaptı;");
        }

        loadCategoryImages();
    }
};

private void loadCategoryImages() {
    view.findViewById(R.id.selectCategory).setVisibility(View.GONE);
    LinearLayout stack = (LinearLayout) view.findViewById(R.id.categoryLayout);
    Delict delict = Delict.getInstance();

    for(int i = 0; i<delict.getCategoryList().size(); i++){
        ImageView image = new ImageView(getActivity());
        image.setBackgroundResource(R.drawable.ic_launcher);
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
        params.setMargins((-30*i), 0, 0, 0);
        image.setLayoutParams(params);
        stack.addView(image);
    }

}


private static final String FRAGMENT_KEY = "fragmentkey";

@Override
public void onSaveInstanceState(Bundle outState) {
    outState.putBoolean(FRAGMENT_KEY, true);
    super.onSaveInstanceState(outState);
}

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    if (savedInstanceState != null) {
        if(savedInstanceState.getBoolean(FRAGMENT_KEY)){
            FragmentTransaction ft = getFragmentManager().beginTransaction();
            Fragment frag1 = getFragmentManager().findFragmentByTag("com.example.PlateFragment");
            ft.hide(frag1);
            ft.commitAllowingStateLoss();
        }

    }
}

}

LogCat说：

03-13 15:01:43.320: E/AndroidRuntime(8477): FATAL EXCEPTION: main
03-13 15:01:43.320: E/AndroidRuntime(8477): java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
03-13 15:01:43.320: E/AndroidRuntime(8477):     at android.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1265)
03-13 15:01:43.320: E/AndroidRuntime(8477):     at android.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1276)
03-13 15:01:43.320: E/AndroidRuntime(8477):     at android.app.BackStackRecord.commitInternal(BackStackRecord.java:541)
03-13 15:01:43.320: E/AndroidRuntime(8477):     at android.app.BackStackRecord.commit(BackStackRecord.java:525)
03-13 15:01:43.320: E/AndroidRuntime(8477):     at com.example.fragmentmanager.FragmentCollection.prevFragment(FragmentCollection.java:77)
03-13 15:01:43.320: E/AndroidRuntime(8477):     at com.example.SimpleGestureFilter.onFling(SimpleGestureFilter.java:130)
03-13 15:01:43.320: E/AndroidRuntime(8477):     at android.view.GestureDetector.onTouchEvent(GestureDetector.java:579)
03-13 15:01:43.320: E/AndroidRuntime(8477):     at com.example.SimpleGestureFilter.onTouchEvent(SimpleGestureFilter.java:53)
03-13 15:01:43.320: E/AndroidRuntime(8477):     at com.example.activities.DelictActivity.dispatchTouchEvent(DelictActivity.java:45)
03-13 15:01:43.320: E/AndroidRuntime(8477):     at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1897)
03-13 15:01:43.320: E/AndroidRuntime(8477):     at android.view.View.dispatchPointerEvent(View.java:5726)
03-13 15:01:43.320: E/AndroidRuntime(8477):     at android.view.ViewRootImpl.deliverPointerEvent(ViewRootImpl.java:2922)
03-13 15:01:43.320: E/AndroidRuntime(8477):     at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2498)
03-13 15:01:43.320: E/AndroidRuntime(8477):     at android.view.ViewRootImpl.processInputEvents(ViewRootImpl.java:864)
03-13 15:01:43.320: E/AndroidRuntime(8477):     at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2507)
03-13 15:01:43.320: E/AndroidRuntime(8477):     at android.os.Handler.dispatchMessage(Handler.java:99)
03-13 15:01:43.320: E/AndroidRuntime(8477):     at android.os.Looper.loop(Looper.java:137)
03-13 15:01:43.320: E/AndroidRuntime(8477):     at android.app.ActivityThread.main(ActivityThread.java:4447)
03-13 15:01:43.320: E/AndroidRuntime(8477):     at java.lang.reflect.Method.invokeNative(Native Method)
03-13 15:01:43.320: E/AndroidRuntime(8477):     at java.lang.reflect.Method.invoke(Method.java:511)
03-13 15:01:43.320: E/AndroidRuntime(8477):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
03-13 15:01:43.320: E/AndroidRuntime(8477):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
03-13 15:01:43.320: E/AndroidRuntime(8477):     at dalvik.system.NativeStart.main(Native Method)

第三个片段是这样的。如您所见，在活动中的onCreate方法中，第一个片段被添加到容器中。我有2 xml的主要活动。第一个用于纵向模式，另一个用于横向模式。如果方向为纵向，则屏幕方向会更改，其中一个片段将显示在屏幕上。如果方向是横向的，则应始终使用相同的布局 - 用于活动的横向模式的布局。

但是在第二次活动后屏幕方向改变后滑动，我收到此错误。有人可以帮帮我吗？

Answer 1

您是否在清单文件中定义了这样的活动？如果由于重新创建激活而没有，则可能会出现此类错误。

机器人：configChanges = “keyboardHidden |取向|屏幕尺寸”

在屏幕方向改变后onSaveInstanceState之后无法执行此操作

1 个答案: