<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/action_share"
        android:icon="@mipmap/ic_launcher"
        android:title="分享"
        app:showAsAction="ifRoom" />

    <item
        android:id="@+id/action_commit"
        android:title="完成"
        app:showAsAction="ifRoom"/>
</menu>
 

package com.example.jekin.toolbar;

import android.os.Bundle;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

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

        initToolbar();
    }

    private void initToolbar() {
        Toolbar toolbar = (Toolbar) findViewById(R.id.id_toolbar);
        TextView titleText = (TextView) findViewById(R.id.toolbar_title);
        toolbar.setTitle("");
        titleText.setText("佳琪衛浴");
        setSupportActionBar(toolbar);
        ActionBar actionBar = getSupportActionBar();
        actionBar.setDisplayHomeAsUpEnabled(true);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()){
            case android.R.id.home:
                Toast.makeText(this, "返回", Toast.LENGTH_SHORT).show();
                return true;
            case R.id.action_share:
                Toast.makeText(this, "分享", Toast.LENGTH_SHORT).show();
                return true;
            case R.id.action_commit:
                Toast.makeText(this, "完成", Toast.LENGTH_SHORT).show();
                return true;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater menuInflater = getMenuInflater();
        menuInflater.inflate(R.menu.toolbar_menu, menu);

        MenuItem commitItem = menu.findItem(R.id.action_commit);
        commitItem.setTitle("完成");
        MenuItem shareItem = menu.findItem(R.id.action_share);
        shareItem.setIcon(R.mipmap.show_share_icon);
        return true;
    }
}
 

總結

第一個問題解決方法就是直接敲，個人也不知道為什麼as沒有提示。第二呢，可以檢視MenuItem類裡面有setIcon方法...有問題請多多指教，吃飯去了

補充