1, Change style

First, change the style of the system to the style without ActionBar, set the color of the theme, and then reference the style.

  <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
 <item name="colorPrimary">@color/colorPrimary</item>
 <item name="colorPrimaryDark">@color/colorPrimaryDar     k</item>
 <item name="colorAccent">@color/colorAccent</item>
 </style>

//Reference information

<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
        <!-- Customize your theme here. -->
        <! -- bottom color of navigation bar -- >
        <item name="colorPrimary">@color/accent_material_dark</item>
        <! -- bottom color of status bar -- >
        <item name="colorPrimaryDark">@color/accent_material_light</item>
        <! -- Title Color on navigation bar -- >
        <item name="android:textColorPrimary">@android:color/black</item>
        <! -- color of activity window -- >
        <item name="android:windowBackground">@color/material_blue_grey_800</item>
        <! -- select the button or click to get the focus color -- >
        <item name="colorAccent">#00ff00</item>
        <! -- opposite to colorAccent, button color in normal state -- >
        <item name="colorControlNormal">#ff0000</item>
        <! -- button normal state color -- >
        <item name="colorButtonNormal">@color/accent_material_light</item>
        <! -- color of font in EditText input box -- >
        <item name="editTextColor">@android:color/white</item>
    </style>

2, Layout file for Toobar

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    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"
    tools:context="com.tk.toolbardemo.MainActivity">
    <!--Set up toolbar The background color of, colorPrimary yes style Set in-->
    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="56dp"
            android:background="?attr/colorPrimary">
        </android.support.v7.widget.Toolbar>
    </android.support.design.widget.AppBarLayout>
</RelativeLayout>

3, Replace ActionBar directly in the main layout

public class MainActivity extends AppCompatActivity implements Toolbar.OnMenuItemClickListener {

    private Toolbar mToolbar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initBar();
    }

    private void initBar() {
        mToolbar = (Toolbar) findViewById(toolbar);
        //Set the current ActionBar
        setSupportActionBar(mToolbar);

        getSupportActionBar().setDisplayShowTitleEnabled(true);
        mToolbar.setTitle("Title");
        mToolbar.setSubtitle("Subtitle");
        mToolbar.setLogo(R.mipmap.ic_launcher);
        //Set the (return button) for the home key of Toobar
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        mToolbar.setOnMenuItemClickListener(this);
    }

    /**
     * Listen to the button of the menu file written by yourself
     */
    @Override
    public boolean onMenuItemClick(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.action_edit:
                Toast.makeText(this, "First icon", Toast.LENGTH_SHORT).show();
                break;
            case R.id.action_share:
                Toast.makeText(this, "Second icon", Toast.LENGTH_SHORT).show();
                break;
        }
        return false;
    }

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

    /**
     * Monitoring of system buttons
     */
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();
        if (id == android.R.id.home) {
            Toast.makeText(this, "home key", Toast.LENGTH_SHORT).show();
            return true;
        }
        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            Toast.makeText(this, "Set button", Toast.LENGTH_SHORT).show();
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

4, Loaded menu file

<menu xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/action_edit"
        android:icon="@mipmap/ic_launcher"
        android:title="lookup"
        app:showAsAction="always"/>

    <item
        android:id="@+id/action_share"
        android:icon="@mipmap/ic_launcher"
        android:title="share"
        app:showAsAction="always"/>

    <item
        android:id="@+id/action_settings"
        android:title="Set up"
        app:showAsAction="never"/>
    <!-- showAsAction:never: That is, click three points to display the font
                      always: It's in toobar The little icon above,
     //Some friends will ask why they see the pictures. Don't you set the title?
     //Because the picture obscures the title -- >
</menu>

5, That's about it

demo address
github address