FragmentManager替换不起作用

Question

当我使用FragmentManager中的replace函数时，片段被添加到堆栈顶部而不删除旧版本。我能够在线找到的所有问题都源于人们在FragmentManager版本之间切换时，但正如您所看到的，我只使用最新版本。

case 2:
                            getGMCompApp().changeActivitiesFragment(new ITServiceCenterListFragment(), true);
                            break;

-

public void changeActivitiesFragment(Fragment frag, boolean addToBackStack, boolean addIfSameFragment) {
    try {
        if (frag == null) {
            // Incoming fragment is null, cancel operation
            return;
        }else if(getCurrentActivity() != null){
            //Activity is not null, attempt to change the activity

            //Grab the fragment manager
            FragmentManager fragmentManager = getCurrentActivity().getFragmentManager();

            if(shouldIncomingFragmentShow(frag, addIfSameFragment)){
                //The fragment should be swapped out
                setCurrentFragment(frag);

                if(!addToBackStack){
                    //The previous fragment should NOT be added to backstack navigation
                    fragmentManager.beginTransaction()
                            .replace(R.id.container, frag).commit();
                    Toast.makeText(getApplicationContext(), "Did not add to back", Toast.LENGTH_SHORT).show();
                } else {
                    // Add the current transaction to the backstack for
                    // easier navigation

                    int backStackCount = fragmentManager.getBackStackEntryCount();
                    String tag = Integer.toString(backStackCount);

                    //Checks to see if fragment already exists somewhere on backStack
                    for(int i = 0; i < backStackCount; i++){
                        //Toast.makeText(getApplicationContext(), "Cmp: " + frag.getClass().getSimpleName() +" with " +  fragmentManager.getBackStackEntryAt(i).getName(), Toast.LENGTH_SHORT).show();
                        if(frag.getClass().getSimpleName().equals(fragmentManager.getBackStackEntryAt(i).getName())){
                            //Fragment duplicateFragment = fragmentManager.findFragmentByTag(Integer.toString(i));
                            //tag = Integer.toString(i);
                            //fragmentManager.beginTransaction().remove(duplicateFragment).commit();
                        }
                    }

                    fragmentManager
                            .beginTransaction()
                            .replace(R.id.container, frag)
                            .addToBackStack(frag.getClass().getSimpleName())
                            .commit();

                }

                if(frag.getClass().equals(ViewImageFragment.class))
                {
                    getCurrentActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

                }else if(getCurrentActivity().getRequestedOrientation() != ActivityInfo.SCREEN_ORIENTATION_PORTRAIT){

                    getCurrentActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

                }
            }

        }

    } catch (Exception ex) {
        Log.e(TAG, ex.getMessage());
    }
}

相关的XML：

<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <!-- The main content view -->
<FrameLayout 
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/black"/>

    <!-- The navigation drawer -->
    <ListView android:id="@+id/left_drawer"
        android:layout_width="240dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:choiceMode="singleChoice"
    android:divider="@android:color/transparent"
    android:dividerHeight="2dp"
    android:background="#111"/>

我还试图手动删除并添加片段，我无法删除实际删除片段，我认为这与replace相同（删除部分失败但添加成功）。< / p>

感谢。

我创建了自己的解决方案并发布，以防其他人帮助。我手动管理片段并在数组中创建自己的堆栈。它将所有片段存储在新版本和旧版本的重复片段之间，然后弹出复制品。恢复所有中间片段，最后将全新片段添加回顶部。

private void manageBackStack(Fragment frag){

        FragmentManager fragManager = getCurrentActivity().getFragmentManager();
        Fragment testFrag = fragManager.findFragmentByTag(frag.getClass().getSimpleName());
        if(testFrag != null) {  //If fragment already exists

            int maxIndex = fragManager.getBackStackEntryCount() - 1;
            Fragment[] stackPlaceholder = new Fragment[maxIndex];

            //Store all fragments between new fragment and its old duplicate in an array
            for (int i = maxIndex; i >= 0; i--) {
                String newFragName = fragManager.getBackStackEntryAt(i).getName();
                if(!newFragName.equals(frag.getClass().getSimpleName())) {
                    //Do not add fragments generated inside other fragments back on to the stack
                    if (!newFragName.equals("ITServiceCenterFragment")) {
                        stackPlaceholder[i - 1] = fragManager.findFragmentByTag(newFragName);
                    }
                    fragManager.popBackStackImmediate();
                }else {
                    fragManager.beginTransaction().remove(fragManager.findFragmentByTag(newFragName)).commit();
                    fragManager.popBackStackImmediate();
                    break;
                }
            }

            //Push the in-between fragments back onto the stack
            for (int i = 0; i < maxIndex; i++) {
                if (stackPlaceholder[i] != null) {
                    String fragName = stackPlaceholder[i].getClass().getSimpleName();
                    fragManager
                            .beginTransaction()
                            .replace(R.id.container, stackPlaceholder[i], fragName)
                            .addToBackStack(fragName)
                            .commit();
                }
            }
        }

        //Push most recent fragment onto stack
        fragManager
                .beginTransaction()
                .replace(R.id.container, frag, frag.getClass().getSimpleName())
                .addToBackStack(frag.getClass().getSimpleName())
                .commit();
    }