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我的应用程序具有这样的结构

MainActivity扩展 ActionBarActivity -- 按下按钮时 --> ListFragment --按下列表项-->片段

在 Fragment中并且如果按下返回键，它会直接转到MainActivity 。我如何让它去 ListFragment

以下是我期望它做的事情

片段*----按下后退键--> *ListFragment --按下后退键 ---> MainActivity扩展 ActionBarActivity

以下代码是我在 mainactivity 和 listfragment 中用来启动任何片段的代码

.........................................

             case 5:

           fragment = new HomeFragment();       
            break;
        default:
            break;
        }

        if (fragment != null) {
            FragmentManager fragmentManager = getSupportFragmentManager();
            fragmentManager.beginTransaction()
                    .replace(R.id.frame_container, fragment).commit();

            // update selected item and title, then close the drawer
            mDrawerList.setItemChecked(position, true);
            mDrawerList.setSelection(position);
            //getSupportActionBar().setSubtitle(navMenuTitles[position]);
            //setTitle(navMenuTitles[position]);
            mDrawerLayout.closeDrawer(mDrawerList);
        } else {
            // error in creating fragment
            Log.e("MainActivity", "Error in creating fragment");
        }

更新

现在我已将以下代码添加到我的 MainActivity

@Override
public void onBackPressed() {

       Fragment frag = getSupportFragmentManager().findFragmentById(R.id.frame_container);

       if((frag instanceof CommonMasjidPrayerTimes)) {
            finish();
        }
}

And following code to my listfragment

FragmentManager fragmentManager = getActivity().getSupportFragmentManager();


                                //  fragmentManager.beginTransaction().replace(R.id.frame_container, fragment).commit();
                            if (masjidNamazTimings != null) {
                                    FragmentTransaction ft = fragmentManager.beginTransaction();
                                    ft.addToBackStack(null);
                                    ft.replace(R.id.frame_container, masjidNamazTimings).commit();

                            }

Now when I press the backbutton on my list fragment or fragment it doesnt go back

4

2 回答 2

1

Isn't this missing: .addToBackStack(null)? See here

于 2014-06-25T09:55:32.387 回答
1

Your code should look like this:

FragmentTransaction ft = fragmentManager.beginTransaction();
ft.replace(R.id.frame_container, fragment).commit();
ft.addToBackStack(null);

Try this. This will work.

于 2014-06-25T09:57:21.000 回答