Androidでプログラムでxmlパラメータを変更する方法

Question

ユーザータイプに基づいてナビゲーションメニューオプションを変更する必要があるアプリで作業しています。ナビゲーションメニューを表示するには、NavigationViewを使用しています。私が立ち往生している唯一の部分は、app:menuパラメータを別のメニューデザイン（activity_nav_drawer2.xml）に変更することです。

activity_nav.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_nav" 
    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_nav" 
    app:menu="@menu/activity_nav_drawer" /> 


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

activity_nav_drawer.xml

<?xml version="1.0" encoding="utf-8"?> 
<menu xmlns:android="http://schemas.android.com/apk/res/android"> 

<group android:checkableBehavior="single"> 
    <item 
     android:id="@+id/nav_Home" 
     android:title="Home" /> 
    <item 
     android:id="@+id/nav_Festivities" 
     android:title="Festivities" /> 
    <!--<item--> 
     <!--android:id="@+id/nav_Announcements"--> 
     <!--android:title="Announcements" />--> 
    <!--<item--> 
     <!--android:id="@+id/nav_Payment"--> 
     <!--android:title="Payment" />--> 
    <!--<item--> 
     <!--android:id="@+id/nav_Settings"--> 
     <!--android:title="Settings" />--> 
    <item 
     android:id="@+id/nav_myCode" 
     android:title="My Code" /> 
    <item 
     android:id="@+id/nav_readCode" 
     android:title="Read Code" /> 
</group> 

<!--<group android:checkableBehavior="single">--> 
    <!--<item--> 
     <!--android:id="@+id/nav_organizer"--> 
     <!--android:title="Become an organizer" />--> 
    <!--<item--> 
     <!--android:id="@+id/nav_Legal"--> 
     <!--android:title="Legal" />--> 

<!--</group>--> 

</menu> 
activity_nav2.xml 

<?xml version="1.0" encoding="utf-8"?> 
<menu xmlns:android="http://schemas.android.com/apk/res/android"> 

<group android:checkableBehavior="single"> 
    <item 
     android:id="@+id/nav_Home" 
     android:title="Home" /> 
    <item 
     android:id="@+id/nav_Festivities" 
     android:title="Create an Event" /> 
    <item 
     android:id="@+id/nav_readCode" 
     android:title="Read Code" /> 
</group> 



</menu> 



MainActivity.java 


public class MainActivity extends AppCompatActivity 
implements NavigationView.OnNavigationItemSelectedListener{ 

public String eventKey; 

private final int REQUEST_CAMERA_CODE = 1; 

Intent intent = getIntent(); 



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

    MapFragment mapFragment = new MapFragment(); 
    FragmentManager manager = getSupportFragmentManager(); 
    manager.beginTransaction().replace(
      R.id.content_nav, 
      mapFragment, 
      mapFragment.getTag() 
    ).commit(); 

    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.set 
    navigationView.setNavigationItemSelectedListener(this); 
    askPermissions(Manifest.permission.CAMERA, REQUEST_CAMERA_CODE); 


} 

@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.nav, 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_signOut){ 
     FirebaseAuth.getInstance().signOut(); 
     LoginManager.getInstance().logOut(); 
     Intent intent = new Intent(MainActivity.this, LoginActivity.class); 
     startActivity(intent); 

    } 

    return super.onOptionsItemSelected(item); 
} 

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

    if (id == R.id.nav_Festivities) { 
     FestivitiesFragment festivitiesFragment = new FestivitiesFragment(); 
     FragmentManager manager = getSupportFragmentManager(); 
     manager.beginTransaction().replace(
       R.id.content_nav, 
       festivitiesFragment, 
       festivitiesFragment.getTag() 
     ).commit(); 
    } else if (id == R.id.nav_myCode) { 


getSupportFragmentManager().beginTransaction().replace(R.id.content_nav,new 
CodeFragment()).commit(); 



    } else if (id == R.id.nav_Home) { 
     MapFragment mapFragment = new MapFragment(); 
     FragmentManager manager = getSupportFragmentManager(); 
     manager.beginTransaction().replace(
       R.id.content_nav, 
       mapFragment, 
       mapFragment.getTag() 
     ).commit(); 

    } else if (id == R.id.nav_readCode) { 

     ReadCodeFragment readCodeFragment = new ReadCodeFragment(); 
     FragmentManager manager = getSupportFragmentManager(); 
     manager.beginTransaction().replace(
       R.id.content_nav, 
       readCodeFragment, 
       readCodeFragment.getTag() 
     ).commit(); 


     } 

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

private void askPermissions(String permissions, int requestCode) { 
    if (ContextCompat.checkSelfPermission(this, permissions) != 
PackageManager.PERMISSION_GRANTED) { 
     ActivityCompat.requestPermissions(this, new String[]{permissions}, 
requestCode); 

    } else { 
     Toast.makeText(this, "Camera already Granted", 
Toast.LENGTH_SHORT).show(); 
    } 

} 

@Override 
public void onRequestPermissionsResult(int requestCode, @NonNull String[] 
permissions, @NonNull int[] grantResults) { 

} 

} 

Answer 1

あなたはユーザーの種類に応じて異なるメニュー項目の可視性を設定することができます。
navigation_menuアイテムを消去する代わりに、さまざまなアイテムの可視性をそれに応じて設定します。