Spinner in Action Bar Ergebnisse ist Null Zeiger Ausnahme

Question

Ich versuche, ein Spinner in meiner Aktionsleiste zu implementieren. Ich habe den Spinner mithilfe von XML in meinem Layout hinzugefügt und versuche dann, seinen Adapter in der Basisaktivitätsklasse (activity_main_layout.xml) festzulegen.

ist Below Hauptaktivität:

public class MainLayoutActivity extends AppCompatActivity 
     implements NavigationView.OnNavigationItemSelectedListener { 
    private static final String DB_NAME = "yourdbsqlite3.db"; 
    private SQLiteDatabase database; 
    private String TABLE_NAME="ENGLISH",SongTittle, hymn_number_selected = "702"; 
    private ArrayList HymNumber_Array,HymtitleSearch_Array,songNumber_Array; 
    private ScrollView song_scrolview ; 
    private TextView song_textview; 


    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main_layout); 
     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 

     //Controls Defination 
     song_scrolview = (ScrollView) findViewById(R.id.song_scrollview); 
     song_textview = (TextView) findViewById(R.id.song_textview); 



     //DB key helper - initialize SQL lite DB 
     ExternalDbOpenHelper dbOpenHelper = new ExternalDbOpenHelper(this, DB_NAME); 
     database = dbOpenHelper.getReadableDatabase(); 

     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_layout, 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); 
    } 

    private void fillHymNumber(String lang) { 



     Spinner spinner2 = (Spinner) findViewById(R.id.song_number_spinner); 
     List<String> list = new ArrayList<String>(); 
     list.add("list 1"); 
     list.add("list 2"); 
     list.add("list 3"); 

     ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, list); 
     dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
     spinner2.setAdapter(dataAdapter); 
    } 

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

     if (id == R.id.nav_english) { 
      fillHymVerses("english","7"); 
     } else if (id == R.id.nav_tsonga) { 
      fillHymVerses("tsonga","7"); 
     } else if (id == R.id.nav_sotho) { 
      fillHymVerses("sotho","7"); 
     } else if (id == R.id.nav_venda) { 
      fillHymVerses("venda","7"); 
     } else if (id == R.id.nav_zulu) { 
      fillHymVerses("zulu","7"); 
     } else if (id == R.id.nav_pedi) { 
      fillHymVerses("pedi","7"); 
     } else if (id == R.id.nav_share) { 
      fillHymVerses("share","7"); 
     } else if (id == R.id.nav_send) { 
      fillHymVerses("send","7"); 
     } 

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

spinnerlayout.xml:

<?xml version="1.0" encoding="utf-8"?> 
<Spinner xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/song_number_spinner" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content"> 

</Spinner> 

activity_main_layout:

<?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_english" 
      android:icon="@drawable/ic_menu_camera" 
      android:title="English" /> 
     <item 
      android:id="@+id/nav_tsonga" 
      android:icon="@drawable/ic_menu_gallery" 
      android:title="Tsonga" /> 
     <item 
      android:id="@+id/nav_sotho" 
      android:icon="@drawable/ic_menu_slideshow" 
      android:title="Sotho" /> 
     <item 
      android:id="@+id/nav_venda" 
      android:icon="@drawable/ic_menu_manage" 
      android:title="Venda" /> 
     <item 
      android:id="@+id/nav_zulu" 
      android:icon="@drawable/ic_menu_slideshow" 
      android:title="Zulu" /> 
     <item 
      android:id="@+id/nav_pedi" 
      android:icon="@drawable/ic_menu_manage" 
      android:title="Pedi" /> 
    </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> 

</menu> 

main_layout.xml:

<?xml version="1.0" encoding="utf-8"?> 
<menu xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto"> 
    <item 
     android:id="@+id/action_spinner" 
     android:orderInCategory="100" 
     android:title="728" 
     app:showAsAction="always" 
     android:actionLayout="@layout/spinnerlayout"/> 
    <item 
     android:id="@+id/action_search" 
     android:orderInCategory="100" 
     android:title="Search" 
     app:showAsAction="never" /> 
    <item 
     android:id="@+id/action_about" 
     android:orderInCategory="100" 
     android:title="About" 
     app:showAsAction="never" /> 
    <item 
     android:id="@+id/action_settings" 
     android:orderInCategory="100" 
     android:title="@string/action_settings" 
     app:showAsAction="never" /> 
    <item 
     android:id="@+id/action_close" 
     android:orderInCategory="100" 
     android:title="Close" 
     app:showAsAction="never" /> 
</menu> 

Answer 1

Versuchen Sie folgendes:

View view = getLayoutInflater().inflate(R.layout.spinnerlayout, null); 
Spinner spinner2 = (Spinner) view.findViewById(R.id.song_number_spinner); 

spinner2.setAdapter(dataAdapter); 

Das Problem, das ich ist zu sehen, dass Ihr spinnerlayout.xml in Ihrem activity_main Layout nicht berücksichtigt, so dass, wenn Sie findViewById() in Ihrer Haupttätigkeit tun, wird es für den Spinner innerhalbactivity_main suchen Layout. So

bekommen tatsächlich Ihre Spinner, müssen Sie aufblasen die layout, der den Spinner ersten, dann gehen Sie vor und die Spinner aus dem Layout abzurufen.