android studio中ToolBar实现标题栏

首先注意将values中的style类中改成NoActionBar

<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light**.NoActionBar**">
    <!-- Customize your theme here. -->
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
</style>

主布局中添加Toolbar标题栏目

<android.support.v7.widget.Toolbar
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#ff0" >
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="主题"/>
</android.support.v7.widget.Toolbar>

主Actvity主类中找到控件以及设置点击事件返回

package com.qianjiu.qgs.choujiang;

import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;

public class MainActivity extends AppCompatActivity {

private Toolbar mToolbar;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mToolbar = findViewById(R.id.toolbar);
    setSupportActionBar(mToolbar);
    getSupportActionBar().setDisplayShowTitleEnabled(true);
    /*getSupportActionBar().setTitle("第一个");
    mToolbar.setTitleTextColor(Color.RED);
    mToolbar.setSubtitle("2");
    mToolbar.setSubtitleTextColor(Color.BLACK);*/
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    mToolbar.setNavigationOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            MainActivity.this.finish();
        }
    });
}

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

@Override
public boolean onPrepareOptionsMenu(Menu menu) {
    return super.onPrepareOptionsMenu(menu);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    return super.onOptionsItemSelected(item);
}

@Override
public void onPanelClosed(int featureId, Menu menu) {
    super.onPanelClosed(featureId, menu);
}

@Override
public boolean onMenuOpened(int featureId, Menu menu) {
    return super.onMenuOpened(featureId, menu);
}

}

在res下创建一个menu.xml文件写入标题栏的效果

<?xml version="1.0" encoding="utf-8"?>