menu学习

在参考书籍“第一行代码”中按照实例编写代码后是没有办法实现menu的，因为我用的是android6.0系统进行的调试，解决方法最直接的就是使用ToolBar来实现。（以下代码及实现方式均来自网络，如有侵权请告知删除）

 

首先需要将style文件进行修改，这样可以设定ToolBar的样式并隐藏标题栏：

<resources>

    <!-- 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>
        <item name="actionOverflowMenuStyle">@style/MenuStyle</item>
    </style>
    <style name="MenuStyle" parent="@style/Widget.AppCompat.Light.PopupMenu.Overflow">
        <item name="android:dropDownVerticalOffset">?attr/actionBarSize</item>
    </style>

</resources>

在activity_main.xml中加入toolbar

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.wangk.toolbartest.MainActivity">

    <android.support.v7.widget.Toolbar
        android:id="@+id/activity_main_toolbar"
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:minHeight="?attr/actionBarSize"
        android:background="?attr/colorPrimary">

    </android.support.v7.widget.Toolbar>
</RelativeLayout>

 

然后新建文件夹menu

然后新建main_menu.xml用来维护菜单内容

<?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_edit"
        android:title="action_edit"
        android:orderInCategory="80"
        android:icon="@drawable/ab_edit"
        app:showAsAction="always" />

    <item android:id="@+id/action_share"
        android:title="action_edit"
        android:orderInCategory="90"
        android:icon="@drawable/ab_share"
        app:showAsAction="always" />

    <item android:id="@+id/action_settings"
        android:title="action_settings"
        android:orderInCategory="100"
        app:showAsAction="never"/>
    <item android:id="@+id/action_settings1"
        android:title="action_settings1"
        android:orderInCategory="100"
        app:showAsAction="never"/>
</menu>

在活动中导入activity_main，并添加菜单栏的响应

package com.example.wangk.toolbartest;

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


public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initActionBar();
    }
    public void initActionBar() {
        Toolbar toolbar = (Toolbar) findViewById(R.id.activity_main_toolbar); //加载toolbar
        toolbar.setTitle("题目");
        toolbar.setLogo(R.drawable.ab_android);
        toolbar.setSubtitle("副标题");
        setSupportActionBar(toolbar);
        toolbar.setNavigationIcon(R.drawable.back);
        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });
        toolbar.setOnMenuItemClickListener(onMenuItemClick);
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main_memu, menu);
        return true;
    }
    private Toolbar.OnMenuItemClickListener onMenuItemClick=new Toolbar.OnMenuItemClickListener() {
        @Override
        public boolean onMenuItemClick(MenuItem item) {
            String msg = "";
            switch (item.getItemId()) {
                case R.id.action_edit:
                    msg += "Click edit";
                    break;
                case R.id.action_share:
                    msg += "Click share";
                    break;
                case R.id.action_settings:
                    msg += "Click setting";
                    break;
                case R.id.action_settings1:
                    msg += "Click setting1";
                    break;
            }
            if (!msg.equals("")) {
                Toast.makeText(MainActivity.this, msg, Toast.LENGTH_SHORT).show();
            }
            return true;
        }
    };
}

 实现效果