將導航菜單項對齊到android

Question

我在android應用程序中創建了導航抽屜，並且正確地從右側出現它，但是隻有菜單項對齊到右側時出現了一個問題，但是我不能，我該怎麼做？

在左側

這與菜單項的圖片顯示的導航是main_activity佈局代碼

<?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="end" 
    android:fitsSystemWindows="true" 
    app:headerLayout="@layout/nav_header_main" 
    app:menu="@menu/activity_main_drawer" /> 

，這是activity_main_drawer菜單項的XML文件：

<?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_camera" 

     android:icon="@drawable/ic_menu_camera" 
     android:title="Camera" /> 
    <item 
     android:id="@+id/nav_gallery" 
     android:icon="@drawable/ic_menu_gallery" 
     android:title="Gallery" /> 
    <item 
     android:id="@+id/nav_slideshow" 
     android:icon="@drawable/ic_menu_slideshow" 
     android:title="Slideshow" /> 
    <item 
     android:id="@+id/nav_manage" 
     android:icon="@drawable/ic_menu_manage" 
     android:title="Tools" /> 
</group> 

<item android:title="Communicate"> 
    <menu> 
     <item 
      android:id="@+id/nav_share" 
      android:icon="@drawable/ic_menu_share" 
      android:title="Share" /> 
     <item 
      android:id="@+id/nav_send" 
      android:icon="@drawable/ic_menu_send" 
      android:title="Send" /> 
    </menu> 
</item> 

在這些項目中，我需要不是在左側，因爲我的導航從右側打開至左在右側顯示它的問題

MainActivity代碼：

public class ParentMainActivity extends AppCompatActivity 
    implements NavigationView.OnNavigationItemSelectedListener { 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main_parent); 
    /*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, "You have chosen mail option", Snackbar.LENGTH_LONG) 
        .setAction("Action", null).show(); 
     } 
    }); 

    final DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 

    ImageButton menuRight = (ImageButton) findViewById(R.id.menuRight); 



    menuRight.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      if (drawer.isDrawerOpen(GravityCompat.END)) { 
       drawer.closeDrawer(GravityCompat.END); 
      } else { 
       drawer.openDrawer(GravityCompat.END); 
      } 
     } 
    }); 
    /*ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
      this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close); 
    drawer.setDrawerListener(toggle); 
    toggle.syncState();*/ 

    NavigationView navigationView1 = (NavigationView) findViewById(R.id.nav_view); 

    navigationView1.setNavigationItemSelectedListener(this); 

} 

@Override 
public void onBackPressed() { 
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
    if (drawer.isDrawerOpen(GravityCompat.END)) { 
     drawer.closeDrawer(GravityCompat.END); 
    } 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(); 
    String text = ""; 
    if (id == R.id.nav_camera) { 
     text = "camera"; 
    } else if (id == R.id.nav_gallery) { 
     text = "gallery"; 
    } else if (id == R.id.nav_slideshow) { 
     text = "slideshow"; 
    } else if (id == R.id.nav_manage) { 
     text = "tools"; 
    } else if (id == R.id.nav_share) { 
     text = "share"; 
    } else if (id == R.id.nav_send) { 
     text = "send"; 

    Toast.makeText(this, "You have chosen " + text, Toast.LENGTH_LONG).show(); 
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 

    drawer.closeDrawer(GravityCompat.END); 
    return true; 
} 

}

Answer 1

如果您的項目使用的API級別爲17或更高，則可以將android:supportsRtl添加到您的清單。

<application 
    android:allowBackup="true" 
    android:icon="@mipmap/ic_launcher" 
    android:label="@string/app_name" 
    android:supportsRtl="true" 
    android:theme="@style/AppTheme"> 
... 
</application> 

此屬性聲明您的應用程序是否願意支持從右到左（RTL）佈局。如果設置爲true並且targetSdkVersion設置爲17或更高，則系統會激活並使用各種RTL API，以便您的應用可以顯示RTL佈局。如果設置爲false或者targetSdkVersion設置爲16或更低，則RTL API將被忽略或無效，並且無論與用戶的Locale選項關聯的佈局方向如何，您的應用程序都會表現相同（您的佈局將始終保留-to-右）。

編輯： 在這個post表明，存在一種強制RTL模式，如果它是可用的答案。在onCreate（）方法調用forceRTLIfSupported（）。

@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1) 
private void forceRTLIfSupported() { 
    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1){ 
     getWindow().getDecorView().setLayoutDirection(View.LAYOUT_DIRECTION_RTL); 
    } 
}