如何保存片段的狀態在導航抽屜

Question

我使用谷歌導航抽屜庫從以下鏈接... https://github.com/Arasthel/GoogleNavigationDrawerMenu

下面

見代碼：

mDrawer.setOnNavigationSectionSelected(new GoogleNavigationDrawer.OnNavigationSectionSelected() { 
     @Override 
     public void onSectionSelected(View v, int i, long l) { 
      Fragment fragment = null; 
      switch (i) { 
      case 0: 
       // fragment = new HomeFragment(); 
       break; 
      case 1: 
       fragment = new NewsFragment(); 

       break; 
      case 2: 
       fragment = new TransferFragment(); 
       break; 
      case 3: 
       fragment = new BlogsFragment(); 
       break; 
      case 4: 
       fragment = new FixturesFragment(); 
       break; 
      case 5: 
       fragment = new BestXIFragment(); 
       break; 
      case 6: 
       fragment = new FeedFragment(); 

       break; 

      default: 
       break; 
      } 
      if (fragment != null) { 
       FragmentManager fragmentManager = getFragmentManager(); 
       fragmentManager.beginTransaction() 
         .replace(R.id.main, fragment).commit(); 

      } else { 
       // error in creating fragment 
       Log.e("MainActivity", "Error in creating fragment"); 
      } 
     } 
    }); 

我的片段是使用異步任務每當我在這些片段之間切換異步任務再次加載。

那麼如何保存片段的狀態？

Answer 1

不是創造每一次新的片段，你可以保持片段的陣列，只是返回相同的對象：

mDrawer.setOnNavigationSectionSelected(new GoogleNavigationDrawer.OnNavigationSectionSelected() { 

Fragment[] fragments ={new HomeFragment(),new NewsFragment(), new TransferFragment(), new BlogsFragment(),new FixturesFragment() , new BestXIFragment(),new FeedFragment()}; 
@Override 

    public void onSectionSelected(View v, int i, long l) { 

     if (fragment[i] != null) { 
      FragmentManager fragmentManager = getFragmentManager(); 
      fragmentManager.beginTransaction() 
        .replace(R.id.main, fragments[i]).commit(); 

     } else { 
      // error in creating fragment 
      Log.e("MainActivity", "Error in creating fragment"); 
     } 
    } 
});