使用导航抽屉处理片段后栈

Question

我正在实施导航抽屉,效果很好.所以我在导航抽屉点击上调用片段,它也在工作,而且我正在调用主页片段中的另一个片段,并为每个片段维护后台堆栈,但问题是从子片段重新按下我不能去主页片段,刚退出应用程序.我不想要这个.我想要什么点击

Navigation Drawer->HomePageFragment->AnotherChild Fragment(On List Item click of HomePageFragment)

但在背面按下而不Homepage会将其直接退出应用程序.这是我的代码:(In Fragment Activity with Navigation Drawer)

class SlideitemListener implements ListView.OnItemClickListener {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position,
            long id) {

        updateDisplay(position);
    }

}

private void updateDisplay(int position) {
    Fragment fragment = null;
    switch (position) {
    case 0:
        fragment = new ScheduleFragment();
        break;
    case 1:
        fragment = new Result_Fragment();
        break;
    case 2:
        fragment = new Live_Match_Fragment();
        break;
    case 3:
        // fragment = new Live_Match_Fragment();
        break;

    case 4:
        fragment = new Team_Fragment();
        break;
    default:
        break;
    }

    if (fragment != null) {

        fragmentManager = getFragmentManager();
        fragmentManager.popBackStackImmediate("0", 0);
        int count = fragmentManager.getBackStackEntryCount();
        FragmentTransaction fragmentTransaction = fragmentManager
                .beginTransaction();
        fragmentTransaction.replace(R.id.frame_container, fragment)
                .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN)
                .addToBackStack(String.valueOf(count)).commit();
        Log.e("Count in Activiy", ""+count);

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

}

现在BackPressed()进来FragmentActivity.

@Override
public void onBackPressed() {
    if (fragmentManager.getBackStackEntryCount() <= 1) {
        finish();

        return;
    }
    super.onBackPressed();
}

现在,HomePage在Listview项目点击时从片段调用另一个子片段.

 team_lv.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                long arg3) {
            // TODO Auto-generated method stub
            TeamDetailFragment myDetailFragment = new TeamDetailFragment();
            FragmentManager fragmentManager = getFragmentManager();
            int count = fragmentManager.getBackStackEntryCount();
            Log.e("Count in Fragment", "" + count);
            FragmentTransaction fragmentTransaction = fragmentManager
                    .beginTransaction();
            fragmentTransaction
                    .replace(R.id.frame_container, myDetailFragment)
                    .setTransition(
                            FragmentTransaction.TRANSIT_FRAGMENT_OPEN)
                    .addToBackStack(String.valueOf(count)).commit();

        }
    });

所以任何人都知道然后帮助我.帮助将是欣赏.

Answer 1

当您按下片段内的后退按钮时，如果您已声明，则将调用您的活动的 onBackPressed() 方法。因此，处理导航抽屉内片段的后退按钮可以是这种方式之一。

主要活动

     public static boolean isMainActivityShown ;
     public static boolean isFragment1Shown=false ;
     public static boolean isFragment2Shown=false ;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        isMainActivityShown=true  //inside onCreate method put isMainActivityShown true
. 
. 
.


 {
               Fragment currentFragment = new Fragment1();
               isMainActivityShown=false;   //when moving to fragment1 
               isFragment1Shown=true;
               frgManager = getFragmentManager();
               frgManager.beginTransaction().replace(R.id.content_frame, currentFragment)
                                        .commit();
 }
.
.
}



  @Override
        public void onBackPressed() {

            if(isMainActivityShown)
            {
                finish();
            }
            else if(isFragment1Shown)
            {
               //write the code to handle back button when you are in Fragment1
            }
           else if(isFragment2Shown)
            {  //When you are in Fragment 2 pressing back button will move to fragment1
                Fragment currentFragment = new Fragment1();
                isFragment2Shown=false;
                isFragment1Shown=true;

                FragmentManager frgManager;
                frgManager = getFragmentManager();
                frgManager.beginTransaction().replace(R.id.content_frame, currentFragment)
                        .commit();
            }

            }

片段1

Fragment currentFragment = new Fragment2();
MainActivity.isFragment1Shown=false;
MainActivity.isFragment2Shown=true;
frgManager = getFragmentManager();
frgManager.beginTransaction().replace(R.id.content_frame, currentFragment)
                                    .commit();