问Android studio中没有错误，应用程序在打开时仍会崩溃

EN

dependecies {  compile 'com.android.support:appcompat-v7:+'  }

 1. remove actionbar from manifest setting a no actionbar style:
     <application
          android:theme="@style/Theme.AppCompact.Light.NoActionBar"
      />

 2. insert Toolbar widget into the layout of the activity:
     <LinearLayout ...>
          ...
          <android.support.v7.widget.Toolbar
               android:id="@+id/mytoolbar"
               android:layout_width="match_parent"
               android:layout_height="?attr/actionBarSize"
               android:background="?attr/colorPrimary"
               android:elevation="8dp"
               android:theme="@style/ThemeOverlay.AppCompat.ActionBar"
               android:popupTheme="@style/ThemeOverlay.AppCompat.Light"/>

          </LinearLayout>

 3. insert the widget into the activity and set it as support toolbar:
      @Override
     protected void onCreate(Bundle savedInstanceState){
           super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_main);
           Toolbar myToolbar = (Toolbar) findViewById(R.id.mytoolbar);
           myToolbar.setLogo(R.mipmap.ic_launcher);
           myToolbar.setTitle("Titolo");
           myToolbar.setSubtitle(R.string.sottotitolo);
           setSupportActionBar(myToolbar);
     }

 4. create a menù for the Toolbar, into res>menu
 <?xml version="1.0" encoding="utf-8"?>
 <menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@+id/new_game"
      android:icon="@drawable/ic_new_game"
      android:title="@string/new_game"
      android:showAsAction="ifRoom"/>
    <item android:id="@+id/help"
      android:icon="@drawable/ic_help"
      android:title="@string/help"
      android:showAsAction="never"/>
    <item android:id="@+id/tutorials"
      android:icon="@drawable/ic_tuts"
      android:title="@string/tutorials"
               android:showAsAction="always"/>
     </menu>

 5. bind menù to toolbar through the two methods into the activity:


@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);
     return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle item selection
    switch (item.getItemId()) {
        case R.id.new_game:
            newGame();
            return true;
        case R.id.help:
            showHelp();
            return true;
        default:
            return super.onOptionsItemSelected(item);
    }
}