S'est écrasé quand il est appliqué de la Barre d'outils

Je suis nouveau dans la programmation Android. Je vais avoir ce problème quand j'ai appliqué la barre d'outils dans mon application et il s'est écrasé quand j'essaye d'exécuter l'application. Voici le code:

ToolbarActivity.java
package com.example.toolbar;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.widget.Toolbar;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
public class ToolbarActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_toolbar);
Toolbar toolbar = (Toolbar) findViewById(R.id.my_awesome_toolbar);
if (toolbar != null) {
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
//Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.toolbar, menu);
return true;
}
}
activity_toolbar.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<android.support.v7.widget.Toolbar
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/my_awesome_toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content" 
android:minHeight="?attr/actionBarSize"
android:background="?attr/colorPrimaryDark"
app:theme="@style/ThemeOverlay.AppCompat.ActionBar">
</android.support.v7.widget.Toolbar>
<TextView 
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="page 1"
/>
</LinearLayout>

et voici mon LogCat:

11-23 04:46:35.260: E/AndroidRuntime(1870): FATAL EXCEPTION: main 11-23 04:46:35.260: E/AndroidRuntime(1870): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.toolbar/com.example.toolbar.ToolbarActivity}: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead. 
11-23 04:46:35.260: E/AndroidRuntime(1870): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211) 11-23 04:46:35.260: E/AndroidRuntime(1870): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261) 11-23 04:46:35.260: E/AndroidRuntime(1870): at android.app.ActivityThread.access$600(ActivityThread.java:141) 11-23 04:46:35.260: E/AndroidRuntime(1870): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256) 11-23 04:46:35.260: E/AndroidRuntime(1870): at android.os.Handler.dispatchMessage(Handler.java:99)
11-23 04:46:35.260: E/AndroidRuntime(1870): at android.os.Looper.loop(Looper.java:137) 11-23 04:46:35.260: E/AndroidRuntime(1870): at android.app.ActivityThread.main(ActivityThread.java:5103) 11-23 04:46:35.260: E/AndroidRuntime(1870): at java.lang.reflect.Method.invokeNative(Native Method) 11-23 04:46:35.260: E/AndroidRuntime(1870): at java.lang.reflect.Method.invoke(Method.java:525) 11-23 04:46:35.260: E/AndroidRuntime(1870): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
11-23 04:46:35.260: E/AndroidRuntime(1870): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 11-23 04:46:35.260: E/AndroidRuntime(1870): at dalvik.system.NativeStart.main(Native Method) 11-23 04:46:35.260: E/AndroidRuntime(1870): Caused by: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead.
11-23 04:46:35.260: E/AndroidRuntime(1870): at android.support.v7.app.ActionBarActivityDelegateBase.setSupportActionBar(ActionB‌​arActivityDelegateBase.java:165) 11-23 04:46:35.260: E/AndroidRuntime(1870): at android.support.v7.app.ActionBarActivity.setSupportActionBar(ActionBarActivity.j‌​ava:92) 11-23 04:46:35.260: E/AndroidRuntime(1870): at com.example.toolbar.ToolbarActivity.onCreate(ToolbarActivity.java:19)
11-23 04:46:35.260: E/AndroidRuntime(1870): at android.app.Activity.performCreate(Activity.java:5133) 11-23 04:46:35.260: E/AndroidRuntime(1870): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 11-23 04:46:35.260: E/AndroidRuntime(1870): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175) 11-23 04:46:35.260: E/AndroidRuntime(1870): ... 11 more

Quelqu'un peut-il me dire quel est le problème? J'avais inclus le appcompat_v7 avec mon projet. Merci.

OriginalL'auteur DanKCl | 2014-11-23