Better than Tollbar ActionBar with

ActionBar

ActionBar title bar control for each activity.
Because of design issues ActionBar is limited, only the top of the activity

Tollbar

Tollbar is a control Material of.
Nice place Tollbar because, Tollbar inherited from ActionBar, improve their flexibility foundation has all the features of the ActionBar, in conjunction with other controls to complete some Material Design [^ 1] effect

Use Tollbar

The new project is a default ActionBar

Let Tollbar visual effect is more obvious

Modify the res / values / styles.xml APPTheme in a name for the style, theme designated parent pastel theme, there are usually two values

Theme.AppCompat.NoActionBar(Dark theme) and Theme.AppCompat.Light.NoActionBar(pale themes)

Tollbar replace ActionBar

In activity_main.xml file to add appcomat-v7 library Tollbar controls

<androidx.appcompat.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"<!--高度设置为ActionBar的高度-->
                android:background="?attr/colorPrimary"//<!--背景色设置为colorPrimary-->
                android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"<!--Tollbar主题-->
                app:popupTheme="@style/ThemeOverlay.AppCompat.Light"/><!--弹出来的菜单项淡色主题-->

Modify MainActivity.java file

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = findViewById(R.id.toolbar);//获取Toolbar的实例
        setSupportActionBar(toolbar);//调用方法传入toolbar
    }

At this point Tollbar and ActionBar on the same.

Change the title name on the Tollbar

Edit the title name, add android activity tags AndroidManifest.xml file: label = "title name."

Tollbar to add some action buttons

Ready to add a few vector (recommended Alibaba vector library download) stored in the drawable directory.
Create a new menu folder directory in res, right-click menu folder a new Menu resource file
Tollbar.xml create a file, add the code

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/info"
        android:icon="@drawable/info"
        android:title="Info"
        app:showAsAction="always"/><!--always表示永远显示在Toolbar中，屏幕不够不显示-->
    <item
        android:id="@+id/delete"
        android:icon="@drawable/delete"
        android:title="Delete"
        app:showAsAction="ifRoom"/><!--ifroom表示屏幕空间足够的话显示，不够则显示在菜单中，
                                        never表示永远显示在菜单中-->
</menu>

MainActivity.java add Click event code, I will just have to add the test button code is not used, the specific logic can be modified depending on the circumstances.

   @Override
       public boolean onOptionsItemSelected(@NonNull MenuItem item) {
           switch (item.getItemId()){
               case R.id.info:
                   Toast.makeText(this,"info",Toast.LENGTH_SHORT).show();
                   break;
               case R.id.delete:
                   Toast.makeText(this,"delete",Toast.LENGTH_SHORT).show();
                   break;
                   default:
           }
           return true;
       }

Well, this code is written, you can take a look at the run, on the first of the basic functions Toolbar Having said that, the welcome of all the great God pointing.

[^ 1]: Material Design is a set of design principles Google interface design