ToolBar标题

##MainActivity

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 toolbar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //获取toobar对象
        toolbar = findViewById(R.id.toolbar);

        //一定要写到第一行
        setSupportActionBar(toolbar);
        //设置是否显示主标题
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        //设置标题
        getSupportActionBar().setTitle("title");
        //设置主标题颜色
        toolbar.setTitleTextColor(Color.BLUE);

        //设置子标题及子标题颜色
        toolbar.setSubtitle("subtitle");
        toolbar.setSubtitleTextColor(Color.BLUE);

        //设置是否显示左侧的按钮
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        //给左侧的按钮
        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //这里处理返回按钮的逻辑
                MainActivity.this.finish();
            }
        });
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        getMenuInflater().inflate(R.menu.tool_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 onOptionsMenuClosed(Menu menu) {
        super.onOptionsMenuClosed(menu);
    }

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

##MainActivity布局

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

##Menu

<?xml version="1.0" encoding="utf-8"?>
  < menu
    xmlns:toolBar="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android">
    < item android:id="@+id/frist"
        android:icon="@mipmap/ic_launcher"
        android:orderInCategory="1"
        toolBar:showAsAction="never"
        android:title="点击编辑"
        >< /item>
    < item
        android:id="@+id/second"
        android:icon="@mipmap/ic_launcher"
        android:orderInCategory="2"
        toolBar:showAsAction="ifRoom"
        android:title="点击分享"
        >< /item>
< /menu>
##style
< style name="AppTheme_base" 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>

效果图