Question

我正在开发一个应用程序，其中我有一个侧边菜单。当单击每个项目时，片段将被替换为新的。

我有一种替换碎片的方法。但碎片重叠而不是替换。旧碎片位于背景中，新碎片位于旧碎片的顶部。

这是我替换片段的方法。

private void changeFragment(Fragment targetFragment){

    resideMenu.clearIgnoredViewList();
    getSupportFragmentManager()
            .beginTransaction()
            .replace(R.id.main_fragment, targetFragment, "fragment")
            .setTransitionStyle(FragmentTransaction.TRANSIT_FRAGMENT_FADE)
            .commit();

}

如何在放置新片段之前清除旧片段？

编辑：

 private void changeFragment(Fragment targetFragment){

    resideMenu.clearIgnoredViewList();
    FragmentTransaction ft = (FragmentTransaction) getSupportFragmentManager().beginTransaction();
    Fragment prev = (Fragment) getSupportFragmentManager().findFragmentByTag("fragment");
    if (prev != null) {
        ft.remove(prev);
    }
    ft.addToBackStack(null);
    ft.commit();

    getSupportFragmentManager()
            .beginTransaction()

            .replace(R.id.main_fragment, targetFragment, "fragment")
            .setTransitionStyle(FragmentTransaction.TRANSIT_FRAGMENT_FADE)
            .addToBackStack(null)
            .commit();



}

Answer 1

尝试使用此代码。只需删除以前的片段..：D

        @Override
        public void onTabUnselected(Tab tab, FragmentTransaction ft) {
            // TODO Auto-generated method stub

            if(fragment instanceof MessageInbox ){

                PRODUCT_FLAG=0;
            }
            ft.remove(fragment);
        }

Answer 2

我总是在创建标签时给它一个标签。之后更容易找到它。然后你可以使用这样的代码：

// DialogFragment.show() will take care of adding the fragment
// in a transaction.  We also want to remove any currently showing
// dialog, so make our own transaction and take care of that here.
    FragmentTransaction ft = getFragmentManager().beginTransaction();
    Fragment prev = getFragmentManager().findFragmentByTag("dialog");
            if (prev != null) {
                ft.remove(prev);
            }
            ft.addToBackStack(null);
            ft.commit();

      // Create and show the dialog.
DialogFragment newFragment = new GrowLogDialogFragment();
newFragment.setTargetFragment(this, 1);
newFragment.show(getFragmentManager().beginTransaction(), "dialog");

Answer 3

FragmentTransaction ft = getFragmentManager()
                                    .beginTransaction();
ft.replace(R.id.main_fragment, targetFragment, "fragment");
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.addToBackStack(null);// this line do that
ft.commit();

Answer 4

在onpause或ondetach

上添加此内容

@Override
public void onPause() {
    // TODO Auto-generated method stub
    try{

        if (fragment != null) {
               FragmentTransaction ft = getActivity().getFragmentManager().beginTransaction();
               ft.remove(fragment);
               ft.commit();
        }
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
         Thread.interrupted();
    super.onPause();
}

}

通过清除现有片段替换Android中的片段

4 个答案: