ToolBar not work
<p>I'm not very good in code but I want to do a little app.
I just want to reset the toolbar but thats not work, i found many solution on internet but I don't understand anything ...</p>

<p>My code :</p>

<p><em>MainActivity.java</em></p>

<pre><code>package r.antoine.gestionbbox;

import android.app.Activity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class MainActivity extends Activity {

    private WebView webview;


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

        webview = (WebView) findViewById(R.id.webView);

        webview .getSettings() .setJavaScriptEnabled(true);
        webview.loadUrl("http://gestionbbox.lan/login.html");
        webview.setWebViewClient(new WebViewClient() {


            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                return false;
            }
        });

    }

}
</code></pre>

<p><em>Activity_main.xml</em></p>

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;android.support.design.widget.CoordinatorLayout
    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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context="r.antoine.gestionbbox.MainActivity"&gt;

    &lt;android.support.design.widget.AppBarLayout
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:theme="@style/AppTheme.AppBarOverlay"&gt;

        &lt;android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/AppTheme.PopupOverlay" /&gt;

    &lt;/android.support.design.widget.AppBarLayout&gt;

    &lt;include layout="@layout/content_main"/&gt;

    &lt;android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="@dimen/fab_margin"
        android:src="@android:drawable/ic_dialog_email" /&gt;

&lt;/android.support.design.widget.CoordinatorLayout&gt;
</code></pre>

<p>Thank You for help</p>