子フラグメント付きフラグメントバックスタック

Question

私は、メインアクティビティに引き出しが付いています。引き出しのすべてのアイテムが私を断片に送ります。

これらのフラグメントから戻るボタンを押すと、メインアクティビティに移動します。

問題は、自分のフラグメントの1つに子フラグメントがあることです。私は親の断片に私を連れて子供のバックボタンをしたい。

実際、私は別の両親と同じことが必要です。

どうすればよいですか？ここで

は私MainActivityです：

package com.example.matancohen.sg50; 

import android.content.DialogInterface; 
import android.os.Bundle; 
import android.os.Handler; 
import android.support.v4.app.FragmentManager; 
import android.support.v7.app.AlertDialog; 
import android.text.Html; 
import android.view.Gravity; 
import android.support.design.widget.NavigationView; 
import android.support.v4.view.GravityCompat; 
import android.support.v4.widget.DrawerLayout; 
import android.support.v7.app.ActionBarDrawerToggle; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 
import android.support.v4.app.Fragment; 
import android.view.MenuItem; 
import android.widget.Toast; 



public class MainActivity extends AppCompatActivity 
    implements NavigationView.OnNavigationItemSelectedListener { 

@Override 
protected void onCreate(Bundle savedInstanceState) { 

    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
      this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close); 
    drawer.addDrawerListener(toggle); 
    toggle.syncState(); 

    NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view); 
    navigationView.setNavigationItemSelectedListener(this); 

    displayView(R.id.nav_home); 



} 


@Override 
public void onBackPressed() { 
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
    if (drawer.isDrawerOpen(GravityCompat.START)) { 
     drawer.closeDrawer(GravityCompat.START); 
    } else { 
     super.onBackPressed(); 
    } 

} 

private void displayView(int itemId) { 
    Fragment fragment = null; 

    switch (itemId) { 
     case R.id.nav_home: 
      fragment = new Article(); 
      break; 
     case R.id.nav_Recipes: 
      fragment = new RecipesMain(); 
      break; 
     case R.id.nav_Converter: 
      fragment = new Converter(); 
      break; 
     case R.id.nav_Videos: 
      fragment = new Videos(); 
      break; 
     case R.id.nav_Tracking: 
      fragment = new Tracking(); 
      break; 
     case R.id.nav_TrainerMenu: 
      fragment = new TrainerMenu(); 
      break; 
     case R.id.nav_Settings: 
      fragment = new Settings(); 
      break; 
     case R.id.nav_About: 
      showDialog(); 
      break; 

    } 


    if (fragment != null) { 
     final Fragment finalFragment = fragment; 
     new Handler().postDelayed(new Runnable() { 
      @Override 
      public void run() { 
       getSupportFragmentManager() 
         .beginTransaction() 
         .setCustomAnimations(android.R.anim.fade_in, android.R.anim.fade_out) 
         .replace(R.id.content_main, finalFragment) 
         .commit(); 
      } 
     }, 0); 
      } 

     DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
     drawer.closeDrawer(GravityCompat.START); 
    } 




@SuppressWarnings("StatementWithEmptyBody") 
@Override 
public boolean onNavigationItemSelected(MenuItem item) { 

    displayView(item.getItemId()); 
    return true; 
} 
} 

レシピフラグメント：

package com.example.matancohen.sg50; 

import android.os.Bundle; 
import android.support.annotation.Nullable; 
import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentManager; 
import android.support.v4.app.FragmentTransaction; 
import android.support.v4.view.GravityCompat; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ImageButton; 
import android.support.v4.app.FragmentActivity; 


public class RecipesMain extends Fragment implements View.OnClickListener { 
@Nullable 
@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) { 
    return inflater.inflate(R.layout.fragment_recipes,container,false); 
} 
@Override 
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { 
    super.onViewCreated(view, savedInstanceState); 
    //you can set the title for your toolbar here for different fragments different titles 
    getActivity().setTitle("מתכונים"); 
    ImageButton stuffedBreast = (ImageButton)getView().findViewById(R.id.stuffedbreast); 
    stuffedBreast.setOnClickListener(this); 
    ImageButton breastSweetpotato = (ImageButton)getView().findViewById(R.id.chickensweetpotato); 
    breastSweetpotato.setOnClickListener(this); 
    ImageButton Cabbage = (ImageButton)getView().findViewById(R.id.cabbage); 
    Cabbage.setOnClickListener(this); 
    ImageButton chickenMeatballs = (ImageButton)getView().findViewById(R.id.chickenmeatballs); 
    chickenMeatballs.setOnClickListener(this); 
    ImageButton Sushi = (ImageButton)getView().findViewById(R.id.sushi); 
    Sushi.setOnClickListener(this); 
    ImageButton SintaBalls = (ImageButton)getView().findViewById(R.id.sintaballs); 
    SintaBalls.setOnClickListener(this); 
    ImageButton Maakuda = (ImageButton)getView().findViewById(R.id.maakuda); 
    Maakuda.setOnClickListener(this); 
} 


@Override 
public void onClick(View v) { 
    Fragment fragment = null; 


    switch (v.getId()) { 

     case R.id.chickenmeatballs: 
      fragment = new RecipeChickenMeatballs(); 
      break; 

     case R.id.chickensweetpotato: 
      fragment = new RecipeChickenSweetPotato(); 
      break; 

     case R.id.cabbage: 
      fragment = new RecipeCabbage(); 
      break; 

     case R.id.stuffedbreast: 
      fragment = new RecipeStuffedBreast(); 
      break; 

     case R.id.sushi: 
      fragment = new RecipeSushi(); 
      break; 

     case R.id.sintaballs: 
      fragment = new RecipeSintaballs(); 
      break; 

     case R.id.maakuda: 
      fragment = new RecipeMaakuda(); 
      break; 
    } 
    if (fragment != null){ 
     FragmentManager fragmentManager = getActivity().getSupportFragmentManager(); 
     FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); 
     fragmentTransaction.setCustomAnimations(R.anim.bottomtop, R.anim.topbottom,R.anim.popbottomtop,R.anim.poptopbottom); 
     fragmentTransaction.replace(R.id.content_main, fragment); 
     fragmentTransaction.addToBackStack(null); 
     fragmentTransaction.commit(); 
    } 
} 

Answer 1

私のソリューションは、MainActivity中onBackPressed（）メソッドをオーバーライドして、このコードを書き、

@Override 
     public void onBackPressed() { 
      DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
      if (drawer.isDrawerOpen(GravityCompat.START)) { 
       drawer.closeDrawer(GravityCompat.START); 
       return; 
      } 

      if (getSupportFragmentManager().findFragmentById(R.id.fragment_container) instanceof Article) { 
       ((Article) getSupportFragmentManager().findFragmentById(R.id.fragment_container)).handleOnBackPress(); 
       return; 
      } 

      if (getSupportFragmentManager().getBackStackEntryCount() == 0) { 
       displayView(R.id.nav_home); 
      } else { 
       super.onBackPressed(); 

      } 
     } 

と追加ですあなたの記事断片の新しいメソッドhandleOnBackPress（）とカスタムコードを書く戻るボタンを操作します。

例：

申し訳

public void handleOnBackPress() { 
     System.exit(0); 
}