ToolBar使用以及使用中的问题

<style name="AppTheme.Base" parent="Theme.AppCompat.Light.NoActionBar">
          //或者是添加item：               
          <item name="windowActionBar">false</item>
          <item name="windowNoTitle">true</item>
          //再将style-v21中styles的AppTheme的parent修改为AppTheme.Base

 <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_height="?attr/actionBarSize"
            android:layout_width="match_parent" >
          </android.support.v7.widget.Toolbar>

Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
          setSupportActionBar(toolbar);

// App Logo
          toolbar.setLogo(R.drawable.ic_launcher);
// Title
          toolbar.setTitle("My Title");
          // Sub Title
          toolbar.setSubtitle("Sub title");
          setSupportActionBar(toolbar);
          // Navigation Icon 要設定在 setSupportActionBar后才有作用
          // 否則會出現 back button样式( 一个箭头图标 )
          toolbar.setNavigationIcon(R.drawable.ab_android);          
          // Menu item click 的監聽事件一樣要設定在 setSupportActionBar 才有作用
          toolbar.setOnMenuItemClickListener(onMenuItemClick);

<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_edit"
  android:title="@string/action_edit"
  android:orderInCategory="80"
  android:icon="@drawable/ab_edit"
  app:showAsAction="ifRoom" />
<item android:id="@+id/action_share"
  android:title="@string/action_edit"
  android:orderInCategory="90"
  android:icon="@drawable/ab_share"
  app:showAsAction="ifRoom" />
<item android:id="@+id/action_settings"
  android:title="@string/action_settings"
  android:orderInCategory="100"
  app:showAsAction="never"/>
          </menu>

 @Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
                    }

  private Toolbar.OnMenuItemClickListener onMenuItemClick = new Toolbar.OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem menuItem) {
     String msg = "";
     switch (menuItem.getItemId()) {
case R.id.action_edit:
msg += "Click edit";
     break;
     case R.id.action_share:
msg += "Click share";
     break;
     case R.id.action_settings:
msg += "Click setting";
     break;
     }
     if(!msg.equals("")) {
Toast.makeText(MainActivity.this, msg, Toast.LENGTH_SHORT).show();
     }
                    return true;
               }
          };