如何导航到所有其他片段的特定片段？

当我按下我的Home_Fragment中的按钮时，控件将进入一个空白页面，当我按下Home_Fragment的按钮时，我想退出我的应用程序，同时当我按下所有其他片段的按钮时，到Home_Fragment。我的MainActivity页面如下。如何导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); 
    } 
}

}

来源

2015-09-16 Bibin P Jacob

只是覆盖每个片段中的onBackButtnPressed方法 – Fakher

删除此行 fragmentTransaction.addToBackStack（null）; –

当我按回应钮应用程序将退出所有其他片段也如果我删除fragmentTransaction.addToBackStack（null） –

您可以编写代码为onBackButton检查的BackStackEntry计数。如果ATLEAST一个fragement是它，伯爵将超过0.1 如果count==0然后做finish()

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

    }

来源

2015-09-16 09:12:00

谢谢你......它工作给我，当我改变0到1 –

哦对不起，其中1.当我想到数字现在。我总是用0.程序员开始他们。大声笑 –

剩下的问题是，当我按回从所有其他片段的按钮我想导航到Home_Fragment，现在它去我之前选择的片段之前的片段.. –

你可以试试这个，它的工作原理：

在主要活动中呼吁片段创建的方法：

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

并且通过以下几行代码调用由任何片段此方法： -

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

来源

2015-09-16 09:52:46

如何导航到所有其他片段的特定片段？

回答

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