Errors:
07-26 17:33:07.043 13384-13384/myapp.searchviewbase E/AndroidRuntime: FATAL EXCEPTION: main
                                                                        Process: myapp.searchviewbase, PID: 13384
                                                                        java.lang.NullPointerException: Attempt to invoke interface method 'android.view.View android.view.MenuItem.getActionView()' on a null object reference
                                                                            at android.support.v4.view.MenuItemCompatHoneycomb.getActionView(MenuItemCompatHoneycomb.java:39)
                                                                            at android.support.v4.view.MenuItemCompat$HoneycombMenuVersionImpl.getActionView(MenuItemCompat.java:176)
                                                                            at android.support.v4.view.MenuItemCompat.getActionView(MenuItemCompat.java:325)
                                                                            at myapp.searchviewbase.MainActivity.onCreateOptionsMenu(MainActivity.java:32)
                                                                            at android.app.Activity.onCreatePanelMenu(Activity.java:2846)
                                                                            at android.support.v4.app.FragmentActivity.onCreatePanelMenu(FragmentActivity.java:358)
                                                                            at android.support.v7.view.WindowCallbackWrapper.onCreatePanelMenu(WindowCallbackWrapper.java:88)
                                                                            at android.support.v7.app.AppCompatDelegateImplBase$AppCompatWindowCallbackBase.onCreatePanelMenu(AppCompatDelegateImplBase.java:270)
                                                                            at android.support.v7.view.WindowCallbackWrapper.onCreatePanelMenu(WindowCallbackWrapper.java:88)
                                                                            at android.support.v7.app.ToolbarActionBar.populateOptionsMenu(ToolbarActionBar.java:454)
                                                                            at android.support.v7.app.ToolbarActionBar$1.run(ToolbarActionBar.java:61)
                                                                            at android.os.Handler.handleCallback(Handler.java:739)
                                                                            at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                            at android.os.Looper.loop(Looper.java:148)
                                                                            at android.app.ActivityThread.main(ActivityThread.java:5417)
                                                                            at java.lang.reflect.Method.invoke(Native Method)
                                                                            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                                            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)



AND


java.lang.ClassCastException: android.support.v7.widget.SearchView cannot be cast to android.support.v4.view.ActionProvider
                                                                            at android.support.v7.view.SupportMenuInflater$MenuState.readItem(SupportMenuInflater.java:400)
                                                                            at android.support.v7.view.SupportMenuInflater.parseMenu(SupportMenuInflater.java:168)
                                                                            at android.support.v7.view.SupportMenuInflater.inflate(SupportMenuInflater.java:118)
                                                                            at us.roob.searchviewbase.MainActivity.onCreateOptionsMenu(MainActivity.java:30)
                                                                            at android.app.Activity.onCreatePanelMenu(Activity.java:2846)
                                                                            at android.support.v4.app.FragmentActivity.onCreatePanelMenu(FragmentActivity.java:358)
                                                                            at android.support.v7.view.WindowCallbackWrapper.onCreatePanelMenu(WindowCallbackWrapper.java:88)
                                                                            at android.support.v7.app.AppCompatDelegateImplBase$AppCompatWindowCallbackBase.onCreatePanelMenu(AppCompatDelegateImplBase.java:270)
                                                                            at android.support.v7.view.WindowCallbackWrapper.onCreatePanelMenu(WindowCallbackWrapper.java:88)
                                                                            at android.support.v7.app.ToolbarActionBar.populateOptionsMenu(ToolbarActionBar.java:454)
                                                                            at android.support.v7.app.ToolbarActionBar$1.run(ToolbarActionBar.java:61)
                                                                            at android.os.Handler.handleCallback(Handler.java:739)
                                                                            at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                            at android.os.Looper.loop(Looper.java:148)
                                                                            at android.app.ActivityThread.main(ActivityThread.java:5417)
                                                                            at java.lang.reflect.Method.invoke(Native Method)
                                                                            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                                            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)


///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
searchable.xml:

<searchable xmlns:android="http://schemas.android.com/apk/res/android"
    android:label="@string/app_name"
    android:hint="Hint hint"
    />
/////////////////////////////////////////////////////////////////////////////
main_menu.xml:
<menu 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"
    tools:context="myapp.searchviewbase.MainActivity">
    <item
        android:id="@+id/action_settings"
        android:title="@string/action_settings"
        android:orderInCategory="100"
        app:showAsAction="never" />

    <item android:id="@+id/action_search"
        android:title="Search Title"
        app:showAsAction="ifRoom|collapseActionView"
        app:actionProviderClass="android.support.v7.widget.SearchView"/>

</menu>



MainActivity.java:

package myapp.searchviewbase;

import android.app.SearchManager;
import android.content.Context;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.view.MenuItemCompat;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.SearchView;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;

public class MainActivity extends AppCompatActivity {

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

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        MenuItem searchItem = menu.findItem(R.id.action_search);
        SearchView searchView = (SearchView) MenuItemCompat.getActionView(searchItem);


        SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
//        SearchView searchView = (SearchView) menu.findItem(R.id.action_search).getActionView();
        searchView.setSearchableInfo( searchManager.getSearchableInfo(getComponentName()) );



        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);
    }
}