12.2 带有action按钮的Toolbar

1、MainActivity

package com.example.materialtest;

import android.os.Build;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

//import android.widget.Toolbar;

import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

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

            Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
            setSupportActionBar(toolbar);// 将 Toolbar 的实例传入
        }

        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
            // 加载菜单
            getMenuInflater().inflate(R.menu.toolbar,menu);
            return true;
        }

        @Override
        public boolean onOptionsItemSelected(MenuItem item) {
            // 设置点击事件
            switch (item.getItemId()){
                case R.id.backup:
                    Toast.makeText(this,"You clicked Backup",Toast.LENGTH_SHORT).show();
                    break;
                case R.id.delete:
                    Toast.makeText(this,"You clicked Delete",Toast.LENGTH_SHORT).show();
                    break;
                case R.id.settings:
                    Toast.makeText(this,"You clicked Setting",Toast.LENGTH_SHORT).show();
                    break;
            }
            return true;
        }

}

2、activity_main.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
    <androidx.appcompat.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"

        android:background="?attr/colorPrimary"

        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
        android:popupTheme = "@style/Theme.AppCompat.Light"
        />


</FrameLayout>

3、values->styles.xml

<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>
    </style>

</resources>

4、res->menu->toolbar.xml

<?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/backup"
        android:icon="@mipmap/ic_diamond"
        android:title="Backup"
        app:showAsAction="always"/>

    <item
        android:id="@+id/delete"
        android:icon="@mipmap/ic_dice"
        android:title="Delete"
        app:showAsAction="ifRoom"/>

    <item
        android:id="@+id/settings"
        android:icon="@mipmap/ic_button"
        android:title="Settings"
        app:showAsAction="never"/>
</menu>

5、AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.materialtest">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.AppCompat.NoActionBar">
        <activity android:name=".MainActivity"
            android:label="Fruits">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>