Wie ändere ich die Symbolgröße in der Navigationsleiste?

Question

Ich möchte die Symbolgröße in der Navigationsleiste ändern. Könnte mir jemand sagen, wie kann ich das erreichen? Hier ist die XML- und Java-Datei.

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

<group android:id="@+id/title1" android:checkableBehavior="single"> 
    <item 
     android:id="@+id/homepage" 
     android:icon="@mipmap/homemenu" 
     android:title="Home" /> 
    </group> 

<group android:id="@+id/title2" android:checkableBehavior="single"> 
    <item 
     android:id="@+id/foodpage" 
     android:icon="@mipmap/foodmenu" 
     android:title="Food" /> 
    </group> 

<group android:id="@+id/title6" android:checkableBehavior="single"> 
    <item 
     android:id="@+id/exit" 
     android:icon="@mipmap/exitmenu" 
     android:title="Exit" /> 
</group> 

Aktivitätsklasse:

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

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

    @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.colourred) { 
      getWindow().getDecorView().setBackgroundColor(Color.parseColor("#33CCCC")); 
      return true; 
     } else if(id == R.id.colourblue){ 
      getWindow().getDecorView().setBackgroundColor(Color.parseColor("#CC9900")); 

     } 

     return super.onOptionsItemSelected(item); 
    } 


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

     if (id == R.id.homepage) { 
      Intent homepage = new Intent (MainActivity.this, MainActivity.class); 
      startActivity(homepage); 
          // Handle the camera action 
     } else if (id == R.id.foodpage) { 
      //handle the food page here 
      fragmentManager.beginTransaction() 
        .replace(R.id.content_frame 
          , new FirstFragment()) 
        .commit(); 

     } else if (id == R.id.schedulepage) { 
      fragmentManager.beginTransaction() 
        .replace(R.id.content_frame 
        , new ScheduleFragment()) 
        .commit(); 

     } else if (id == R.id.emotionspage) { 
      fragmentManager.beginTransaction() 
        .replace(R.id.content_frame 
        , new EmotionsFragment()) 
        .commit(); 

     } else if (id == R.id.basicneedspage) { 
      fragmentManager.beginTransaction() 
        .replace(R.id.content_frame 
        , new BasicneedsFragment()) 
        .commit(); 

     } else if (id == R.id.exit) { 
      askBeforeExit(); 

     } 

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

    public void onBackPressed() { 

     askBeforeExit(); 
    } 
} 

Answer 1

Sie die Größe der durch zwingende design_navigation_icon_size Attribut Navigationsleiste Symbole ändern können in dimens.xml

<dimen name="design_navigation_icon_size" tools:override="true">40dp</dimen>