如何導航到所有其他片段的特定片段？

當我按下我的Home_Fragment中的按鈕時，控件將進入一個空白頁面，當我按下Home_Fragment的按鈕時，我想退出我的應用程序，同時當我按下所有其他片段的按鈕時，到Home_Fragment。我的MainActivity頁面如下。如何導航到所有其他片段的特定片段？

public class MainActivity extends ActionBarActivity implements FragmentDrawer.FragmentDrawerListener { 

private static String TAG = MainActivity.class.getSimpleName(); 

private Toolbar mToolbar; 
private FragmentDrawer drawerFragment; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    mToolbar = (Toolbar) findViewById(R.id.toolbar); 

    setSupportActionBar(mToolbar); 
    getSupportActionBar().setDisplayShowHomeEnabled(true); 

    drawerFragment = (FragmentDrawer) 
      getSupportFragmentManager().findFragmentById(R.id.fragment_navigation_drawer); 
    drawerFragment.setUp(R.id.fragment_navigation_drawer, (DrawerLayout) findViewById(R.id.drawer_layout), mToolbar); 
    drawerFragment.setDrawerListener(this); 

    // display the first navigation drawer view on app launch 
    displayView(0); 
} 


@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.menu_main, menu); 
    return true; 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    // Handle action bar item clicks here. The action bar will 
    // automatically handle clicks on the Home/Up button, so long 
    // as you specify a parent activity in AndroidManifest.xml. 
    int id = item.getItemId(); 

    //noinspection SimplifiableIfStatement 
    if (id == R.id.action_settings) { 
     return true; 
    } 

    if(id == R.id.action_search){ 
     Toast.makeText(getApplicationContext(), "Search action is selected!", Toast.LENGTH_SHORT).show(); 
     return true; 
    } 

    return super.onOptionsItemSelected(item); 
} 

@Override 
public void onDrawerItemSelected(View view, int position) { 
     displayView(position); 
} 

private void displayView(int position) { 
    Fragment fragment = null; 
    String title = getString(R.string.app_name); 
    switch (position) { 
     case 0: 
      fragment = new HomeFragment(); 
      title = getString(R.string.title_home); 
      break; 
     case 1: 
      fragment = new FriendsFragment(); 
      title = getString(R.string.title_friends); 
      break; 
     case 2: 
      fragment = new MessagesFragment(); 
      title = getString(R.string.title_messages); 
      break; 
     default: 
      break; 
    } 

    if (fragment != null) { 
     FragmentManager fragmentManager = getSupportFragmentManager(); 
     FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); 
     fragmentTransaction.replace(R.id.container_body, fragment); 
     fragmentTransaction.addToBackStack(null); 
     fragmentTransaction.commit(); 

     // set the toolbar title 
     getSupportActionBar().setTitle(title); 
    } 
}

}

來源

2015-09-16 Bibin P Jacob

只是覆蓋每個片段中的onBackButtnPressed方法 – Fakher

刪除此行 fragmentTransaction.addToBackStack（null）; –

當我按回應鈕應用程序將退出所有其他片段也如果我刪除fragmentTransaction.addToBackStack（null） –

您可以編寫代碼爲onBackButton檢查的BackStackEntry計數。如果ATLEAST一個fragement是它，伯爵將超過0.1 如果count==0然後做finish()

@Override 
    public void onBackPressed() { 
    FragmentManager fm = getSupportFragmentManager(); 
     if (fm.getBackStackEntryCount() == 1) { 
      //no fragments left 
      finish(); 
     } else { 
      super.onBackPressed(); 
     } 

    }

來源

2015-09-16 09:12:00

謝謝你......它工作給我，當我改變0到1 –

哦對不起，其中1.當我想到數字現在。我總是用0.程序員開始他們。大聲笑 –

剩下的問題是，當我按回從所有其他片段的按鈕我想導航到Home_Fragment，現在它去我之前選擇的片段之前的片段.. –

你可以試試這個，它的工作原理：

在主要活動中呼籲片段創建的方法：

public void replaceFragment(Fragment fragmentName){ 
FragmentManager fragmentManager = getSupportFragmentManager(); 
     FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); 
     fragmentTransaction.replace(R.id.container_body, fragmentName); 
     fragmentTransaction.addToBackStack(null); 
     fragmentTransaction.commit(); 
}

並且通過以下幾行代碼調用由任何片段此方法： -

((MainActivity)getActivity).replaceFragment(FragmentName.class)

來源

2015-09-16 09:52:46

如何導航到所有其他片段的特定片段？

回答

相關問題