How to add refresh button to toolbar?

Question

Java

Menu not showing

<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=".MainActivity">
    <item android:id="@+id/action_settings" android:title="@string/action_settings"
        android:orderInCategory="100" app:showAsAction="never" />

    <item
        android:id="@+id/action_refresh"
        android:title="@string/refresh_button"
        android:icon="@drawable/ic_refresh_white_48dp"
        android:orderInCategory="1"
        app:showAsAction="never"
        />

</menu>

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context=".MainActivity">



    <WebView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/mWebView"
        android:layout_centerVertical="true"
        android:layout_alignParentStart="true" />
</LinearLayout>

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;


public class MainActivity extends Activity {

    private WebView mWebView;


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mWebView = new WebView(this);
        mWebView.getSettings().setJavaScriptEnabled(true);
        final Activity activity = this;
        mWebView.setWebViewClient(new WebViewClient(){

            public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
                Toast.makeText(activity, description, Toast.LENGTH_SHORT).show();
            }

        });

        mWebView.loadUrl("http://www.google.ru");
        setContentView(mWebView);

    }

    @Override
    public boolean onCreateOptionsMenu (Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.menu_main, menu);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if(item.getItemId() == R.id.action_refresh){
          mWebView.reload();
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

Answer 1

It's no wonder they didn't find it, it's Java, with all the consequences , and the newer the API, the more these very "consequences", Toolbardoes not contain any buttons other than ActionBarDrawerToggle, it only "renders" ActionBar, so you had to look for ActionBar, and so in ActionBar data is already loaded by the third class in the "chain" - your Activity, which, in turn, should take them from the fourth entity - options menu:

//Это в Activity
    @Override
    public boolean onCreateOptionsMenu(Menu menu){
    	MenuInflater inflater = getMenuInflater();
    	inflater.inflate(R.menu.menu_activity_main, menu);
    	return true;
    }

And this is the resource (file) menu_activity_main.xml in the /res/menu folder:

<?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_update"
        android:title="Обновить"
        android:icon="@drawable/ic_launcher"
        app:showAsAction="always"/>
        
 
</menu>