Commutation entre les fragments avec un bouton de navigation par défaut modèle Tiroir d'Android studio

Question

J'utilise par défaut Navigation tiroir en studio Android, et j'ajouté deux fragments pour le premier deux boutons dans le tiroir de navigation. Tout fonctionne bien et je peux basculer entre ces fragments du menu du tiroir. Mais je veux avoir un simple bouton en premier fragment qu'en cliquant sur le prendre deuxième fragment. Cliquer sur un tel bouton ouvre le deuxième fragment, mais il semble que tout l'écran se superpose et disparaisse de la vue de navigation. Ce sont les codes de mon projet, S'il vous plaît me aider:

MainActivity.java:

package com.example.arantik.test4; 

import android.os.Bundle; 
import android.support.design.widget.FloatingActionButton; 
import android.support.design.widget.Snackbar; 
import android.support.v4.app.Fragment; 
import android.view.View; 
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.view.Menu; 
import android.view.MenuItem; 

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); 

     FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
     fab.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG) 
         .setAction("Action", null).show(); 
      } 
     }); 

     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.setDrawerListener(toggle); 
     toggle.syncState(); 

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

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

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

     return super.onOptionsItemSelected(item); 
    } 

    @SuppressWarnings("StatementWithEmptyBody") 
    @Override 
    public boolean onNavigationItemSelected(MenuItem item) { 
     // Handle navigation view item clicks here. 
     int id = item.getItemId(); 

     Fragment fragment=null; 

     if (id == R.id.nav_camera) { 
      fragment=new Fragment_1(); 
     } else if (id == R.id.nav_gallery) { 
      fragment=new Fragment_2(); 
     } 

     android.support.v4.app.FragmentTransaction transaction=getSupportFragmentManager().beginTransaction(); 
     transaction.replace(R.id.mainFrame, fragment); 
     transaction.addToBackStack(null); 
     transaction.commit(); 

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

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?> 
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:id="@+id/drawer_layout" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:fitsSystemWindows="true" 
    tools:openDrawer="start"> 

    <include 
     layout="@layout/app_bar_main" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" /> 

    <android.support.design.widget.NavigationView 
     android:id="@+id/nav_view" 
     android:layout_width="wrap_content" 
     android:layout_height="match_parent" 
     android:layout_gravity="start" 
     android:fitsSystemWindows="true" 
     app:headerLayout="@layout/nav_header_main" 
     app:menu="@menu/activity_main_drawer" /> 

</android.support.v4.widget.DrawerLayout> 

content_main.xml :

<?xml version="1.0" encoding="utf-8"?> 
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    app:layout_behavior="@string/appbar_scrolling_view_behavior" 
    tools:context="com.example.arantik.test4.MainActivity" 
    tools:showIn="@layout/app_bar_main"> 

    <FrameLayout 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:id="@+id/mainFrame"> 
    </FrameLayout> 

</android.support.constraint.ConstraintLayout> 

Fragment_1.java:

package com.example.arantik.test4; 

import android.support.v4.app.Fragment; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.Button; 

public class Fragment_1 extends Fragment { 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 

     View view=inflater.inflate(R.layout.fragment_1_layout, container, false); 

     Button button=(Button)view.findViewById(R.id.button); 
     button.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       android.support.v4.app.FragmentManager fragmentManager = getFragmentManager(); 
       android.support.v4.app.FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); 
       Fragment_2 fragment_2=new Fragment_2(); 
       fragmentTransaction.replace(android.R.id.content, fragment_2); 
       fragmentTransaction.addToBackStack(null); 
       fragmentTransaction.commit(); 
      } 
     }); 
     return view; 
    } 
} 

fragmen_1_layout.xml:

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <TextView 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:id="@+id/textView" 
     android:text="First Fragment" 
     android:textSize="20sp"/> 
    <Button 
     android:layout_width="100dp" 
     android:layout_height="60dp" 
     android:id="@+id/button" 
     android:text="click"/> 

</LinearLayout> 

Fragment_2.java:

package com.example.arantik.test4; 

import android.support.v4.app.Fragment; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 

public class Fragment_2 extends Fragment { 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 

     View view=inflater.inflate(R.layout.fragment_2_layout, container, false); 
     return view; 
    } 
} 

fragmen_2_layout.xml:

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:background="#00ff00"> 

    <TextView 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:id="@+id/textView" 
     android:text="Second Fragment" 
     android:textSize="20sp"/> 

</LinearLayout> 

Je n'ai pas changé d'autres codes Java ou XML. Désolé pour mon mauvais anglais, merci.

Answer 1

Ajoutez une méthode publique à MainActivity, puis getActivity() à MainActivity dans votre fragment, puis vous pouvez appeler la méthode. Vous pouvez également utiliser interface, référez-vous Communicating with Other Fragments