分类：C#、Android、VS2015；

创建日期：2016-02-29

一、简介

利用这个例子，可测试通知的各种属性以及这些不同属性选项呈现的效果。

另外，在这个例子中，还演示了如何读写SD中的图像文件。

二、示例3运行截图

 

三、主要设计步骤

本示例使用了下面的图像文件：

ch1503_monkey_icon.png

ch1503_notification.png

ch1503_x_bldg.jpg

如果你不想使用这些文件，也可以用其他的图像文件代替。

1、添加ch1503arrays.xml

在values文件夹下添加该文件。 

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

<resources>

    <string-array name="notification_style">

        <item>Normal</item>

        <item>Big Text</item>

        <item>Inbox</item>

        <item>Image</item>

    </string-array>

    <string-array name="notification_visibility">

        <item>Public</item>

        <item>Private</item>

        <item>Secret</item>

    </string-array>

    <string-array name="notification_priority">

        <item>Default</item>

        <item>High</item>

        <item>Low</item>

        <item>Maximum</item>

        <item>Minimum</item>

    </string-array>

    <string-array name="notification_category">

        <item>Call</item>

        <item>Message</item>

        <item>Alarm</item>

        <item>Email</item>

        <item>Event</item>

        <item>Promo</item>

        <item>Progress</item>

        <item>Social</item>

        <item>Error</item>

        <item>Transport</item>

        <item>System</item>

        <item>Service</item>

        <item>Recommendation</item>

        <item>Status</item>

    </string-array>

</resources>

2、添加权限（如果已经有这些权限就不用添加了）

在AndroidManifest.xml文件中添加下面的权限（允许震动、允许读取外部存储）：

<uses-permission android:name="android.permission.VIBRATE" />

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

3、添加ch1503_Main.axml

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

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical"

    android:gravity="center_horizontal"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent">

    <TextView

        android:id="@+id/textView1"

        android:layout_width="300dp"

        android:layout_height="wrap_content"

        android:layout_marginTop="10dp"

        android:layout_marginBottom="5dp"

        android:gravity="center_horizontal"

        android:textAppearance="?android:attr/textAppearanceMedium"

        android:text="这是通知的标题" />

    <EditText

        android:id="@+id/notifyText"

        android:layout_width="300dp"

        android:layout_height="100dp"

        android:layout_marginBottom="8dp"

        android:layout_below="@+id/textView1"

        android:singleLine="false"

        android:textAppearance="?android:attr/textAppearanceSmall"

        android:text="这是通知的详细信息。" />

    <TextView

        android:id="@+id/textViewStyle"

        android:layout_width="100dp"

        android:layout_height="35dp"

        android:layout_gravity="center_horizontal"

        android:layout_marginRight="10dp"

        android:layout_marginBottom="2dp"

        android:layout_below="@+id/notifyText"

        android:gravity="right"

        android:textAppearance="?android:attr/textAppearanceMedium"

        android:text="Style:" />

    <Spinner

        android:layout_width="150dp"

        android:layout_height="35dp"

        android:layout_gravity="center_horizontal"

        android:layout_marginBottom="2dp"

        android:layout_below="@+id/notifyText"

        android:layout_toRightOf="@+id/textViewStyle"

        android:layout_alignBaseline="@+id/textViewStyle"

        android:id="@+id/styleSpinner" />

    <TextView

        android:id="@+id/textViewVisibility"

        android:layout_width="100dp"

        android:layout_height="35dp"

        android:layout_gravity="center_horizontal"

        android:layout_marginRight="10dp"

        android:layout_marginBottom="2dp"

        android:layout_below="@+id/styleSpinner"

        android:gravity="right"

        android:textAppearance="?android:attr/textAppearanceMedium"

        android:text="Visibility:" />

    <Spinner

        android:layout_width="150dp"

        android:layout_height="35dp"

        android:layout_gravity="center_horizontal"

        android:layout_marginBottom="2dp"

        android:layout_below="@+id/styleSpinner"

        android:layout_toRightOf="@+id/textViewVisibility"

        android:layout_alignBaseline="@+id/textViewVisibility"

        android:id="@+id/visibilitySpinner" />

    <TextView

        android:id="@+id/textViewPriority"

        android:layout_width="100dp"

        android:layout_height="35dp"

        android:layout_gravity="center_horizontal"

        android:layout_marginRight="10dp"

        android:layout_marginBottom="2dp"

        android:layout_below="@+id/visibilitySpinner"

        android:gravity="right"

        android:textAppearance="?android:attr/textAppearanceMedium"

        android:text="Priority:" />

    <Spinner

        android:layout_width="150dp"

        android:layout_height="35dp"

        android:layout_gravity="center_horizontal"

        android:layout_marginBottom="2dp"

        android:layout_below="@+id/visibilitySpinner"

        android:layout_toRightOf="@+id/textViewPriority"

        android:layout_alignBaseline="@+id/textViewPriority"

        android:id="@+id/prioritySpinner" />

    <TextView

        android:id="@+id/textViewCategory"

        android:layout_width="100dp"

        android:layout_height="35dp"

        android:layout_gravity="center_horizontal"

        android:layout_marginRight="10dp"

        android:layout_marginBottom="10dp"

        android:layout_below="@+id/prioritySpinner"

        android:gravity="right"

        android:textAppearance="?android:attr/textAppearanceMedium"

        android:text="Category:" />

    <Spinner

        android:layout_width="150dp"

        android:layout_height="35dp"

        android:layout_gravity="center_horizontal"

        android:layout_marginBottom="10dp"

        android:layout_below="@+id/prioritySpinner"

        android:layout_toRightOf="@+id/textViewCategory"

        android:layout_alignBaseline="@+id/textViewCategory"

        android:id="@+id/categorySpinner" />

    <Switch

        android:layout_width="200dp"

        android:layout_height="wrap_content"

        android:layout_gravity="center_horizontal"

        android:gravity="right"

        android:layout_marginBottom="10dp"

        android:layout_below="@+id/categorySpinner"

        android:textAppearance="?android:attr/textAppearanceMedium"

        android:text="Large Icon:"

        android:id="@+id/largeIconSwitch" />

    <Switch

        android:layout_width="200dp"

        android:layout_height="wrap_content"

        android:layout_gravity="center_horizontal"

        android:gravity="right"

        android:layout_marginBottom="10dp"

        android:layout_below="@+id/largeIconSwitch"

        android:textAppearance="?android:attr/textAppearanceMedium"

        android:text="Sound:"

        android:id="@+id/soundSwitch" />

    <Switch

        android:layout_width="200dp"

        android:layout_height="wrap_content"

        android:layout_gravity="center_horizontal"

        android:gravity="right"

        android:layout_below="@+id/soundSwitch"

        android:textAppearance="?android:attr/textAppearanceMedium"

        android:text="Vibrate:"

        android:id="@+id/vibrateSwitch" />

    <Button

        android:text="发送通知"

        android:layout_width="300dp"

        android:layout_height="wrap_content"

        android:layout_marginTop="25dp"

        android:layout_below="@+id/vibrateSwitch"

        android:id="@+id/launchButton" />

</RelativeLayout>

4、添加ch1503_Second.axml

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

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:minWidth="25px"

    android:minHeight="25px">

    <TextView

        android:text=""

        android:layout_width="300dp"

        android:layout_height="wrap_content"

        android:layout_marginTop="10dp"

        android:gravity="center_horizontal"

        android:textAppearance="?android:attr/textAppearanceLarge"

        android:id="@+id/textView1" />

</LinearLayout>

5、添加ch1503SecondActivity.cs

using Android.App;

using Android.Content;

using Android.OS;

using Android.Widget;

namespace MyDemos.SrcDemos

{

    [Activity(Label = "ch1503SecondActivity")]

    public class ch1503SecondActivity : Activity

    {

        protected override void OnCreate(Bundle savedInstanceState)

        {

            base.OnCreate(savedInstanceState);

            string message = Intent.Extras.GetString("message", "");

            SetContentView(Resource.Layout.ch1503_Second);

            TextView textView = FindViewById<TextView>(Resource.Id.textView1);

            textView.Text = string.Format("传递到SecondActivity的消息是：\n {0}", message);

        }

    }

}

6、添加ch1503MainActivity.cs

using System;

using Android.App;

using Android.Content;

using Android.OS;

using Android.Widget;

using Android.Graphics;

namespace MyDemos.SrcDemos

{

    [Activity(Label = "【例15-3】通知的各种基本用法")]

    public class ch1503MainActivity : Activity

    {

        EditText notifyMsg;

        protected override void OnCreate(Bundle savedInstanceState)

        {

            base.OnCreate(savedInstanceState);

            SetContentView(Resource.Layout.ch1503_Main);

            var notificationManager = GetSystemService(NotificationService) as NotificationManager;

            // 可在文本框中直接编辑通知消息：

            notifyMsg = FindViewById<EditText>(Resource.Id.notifyText);

            #region 设置在Resources/values/arrays.xml中定义的下拉框（Spinners）

            //样式下拉框

            Spinner styleSpinner = FindViewById<Spinner>(Resource.Id.styleSpinner);

            var styleAdapter = ArrayAdapter.CreateFromResource(this,

                Resource.Array.notification_style,

                Android.Resource.Layout.SimpleSpinnerDropDownItem);

            styleSpinner.Adapter = styleAdapter;

            // 选择下拉框时控制文本框的样式:

            styleSpinner.ItemSelected += new EventHandler<AdapterView.ItemSelectedEventArgs>(styleSpinnerSelected);

            //可见性下拉框

            Spinner visibilitySpinner = FindViewById<Spinner>(Resource.Id.visibilitySpinner);

            var visibilityAdapter = ArrayAdapter.CreateFromResource(this,

                Resource.Array.notification_visibility,

                Android.Resource.Layout.SimpleSpinnerDropDownItem);

            visibilitySpinner.Adapter = visibilityAdapter;

            //优先级下拉框

            Spinner prioritySpinner = FindViewById<Spinner>(Resource.Id.prioritySpinner);

            var priorityAdapter = ArrayAdapter.CreateFromResource(this,

                Resource.Array.notification_priority,

                Android.Resource.Layout.SimpleSpinnerDropDownItem);

            prioritySpinner.Adapter = priorityAdapter;

            // 分类下拉框

            Spinner categorySpinner = FindViewById<Spinner>(Resource.Id.categorySpinner);

            var categoryAdapter = ArrayAdapter.CreateFromResource(this,

                Resource.Array.notification_category,

                Android.Resource.Layout.SimpleSpinnerDropDownItem);

            categorySpinner.Adapter = categoryAdapter;

            #endregion

            #region 选项开关

            // 获取布局中的大图标、声音、振动开关:

            Switch largeIconSw = FindViewById<Switch>(Resource.Id.largeIconSwitch);

            Switch soundSw = FindViewById<Switch>(Resource.Id.soundSwitch);

            Switch vibrateSw = FindViewById<Switch>(Resource.Id.vibrateSwitch);

            #endregion

            #region 执行通知的按钮

            Button launchBtn = FindViewById<Button>(Resource.Id.launchButton);

            launchBtn.Click += delegate

            {

                Notification.Builder builder = new Notification.Builder(this)

                    .SetContentTitle("Sample Notification")

                    .SetContentText(notifyMsg.Text)

                    .SetSmallIcon(Resource.Drawable.ch1503_notification)

                    .SetAutoCancel(true);

                if (largeIconSw.Checked)

                    builder.SetLargeIcon(BitmapFactory.DecodeResource(Resources, Resource.Drawable.ch1503_monkey_icon));

                switch (styleSpinner.SelectedItem.ToString())

                {

                    case "Big Text":

                        builder.SetContentTitle("Big Text Notification");

                        var textStyle = new Notification.BigTextStyle();

                        textStyle.BigText(notifyMsg.Text);

                        textStyle.SetSummaryText("The summary text goes here.");

                        builder.SetStyle(textStyle);

                        break;

                    case "Inbox":

                        var inboxStyle = new Notification.InboxStyle();

                        builder.SetContentTitle("5 条新消息");

                        builder.SetContentText("abc@126.com");

                        inboxStyle.AddLine("张三：香蕉便宜了");

                        inboxStyle.AddLine("李四：那事咋样了");

                        inboxStyle.AddLine("王五：别忘了给我回邮件");

                        inboxStyle.SetSummaryText("+2 more");

                        builder.SetStyle(inboxStyle);

                        break;

                    case "Image":

                        builder.SetContentTitle("Image Notification");

                        var picStyle = new Notification.BigPictureStyle();

                        //用法1

                        picStyle.BigPicture(BitmapFactory.DecodeResource(Resources, Resource.Drawable.ch1503_x_bldg));

                        picStyle.SetSummaryText("The summary text goes here.");

                        // 用法2（从SD卡中读取图像）

                        // BitmapFactory.Options options = new BitmapFactory.Options();

                        // options.InSampleSize = 2;

                        // string imagePath = "/sdcard/Pictures/my-tshirt.jpg";

                        // picStyle.BigPicture(BitmapFactory.DecodeFile(imagePath, options));

                        // picStyle.SetSummaryText("Check out my new T-shirt!");

                        builder.SetStyle(picStyle);

                        break;

                    default:

                        // 使用默认的通知样式

                        break;

                }

                switch (visibilitySpinner.SelectedItem.ToString())

                {

                    case "Public": builder.SetVisibility(NotificationVisibility.Public); break;

                    case "Private": builder.SetVisibility(NotificationVisibility.Private); break;

                    case "Secret": builder.SetVisibility(NotificationVisibility.Secret); break;

                }

                switch (prioritySpinner.SelectedItem.ToString())

                {

                    case "High": builder.SetPriority((int)NotificationPriority.High); break;

                    case "Low": builder.SetPriority((int)NotificationPriority.Low); break;

                    case "Maximum": builder.SetPriority((int)NotificationPriority.Max); break;

                    case "Minimum": builder.SetPriority((int)NotificationPriority.Min); break;

                    default: builder.SetPriority((int)NotificationPriority.Default); break;

                }

                switch (categorySpinner.SelectedItem.ToString())

                {

                    case "Call": builder.SetCategory(Notification.CategoryCall); break;

                    case "Message": builder.SetCategory(Notification.CategoryMessage); break;

                    case "Alarm": builder.SetCategory(Notification.CategoryAlarm); break;

                    case "Email": builder.SetCategory(Notification.CategoryEmail); break;

                    case "Event": builder.SetCategory(Notification.CategoryEvent); break;

                    case "Promo": builder.SetCategory(Notification.CategoryPromo); break;

                    case "Progress": builder.SetCategory(Notification.CategoryProgress); break;

                    case "Social": builder.SetCategory(Notification.CategorySocial); break;

                    case "Error": builder.SetCategory(Notification.CategoryError); break;

                    case "Transport": builder.SetCategory(Notification.CategoryTransport); break;

                    case "System": builder.SetCategory(Notification.CategorySystem); break;

                    case "Service": builder.SetCategory(Notification.CategoryService); break;

                    case "Recommendation": builder.SetCategory(Notification.CategoryRecommendation); break;

                    case "Status": builder.SetCategory(Notification.CategoryStatus); break;

                    default: builder.SetCategory(Notification.CategoryStatus); break;

                }

                #endregion

                Intent secondIntent = new Intent(this, typeof(ch1503SecondActivity));

                secondIntent.PutExtra("message", notifyMsg.Text);

                TaskStackBuilder stackBuilder = TaskStackBuilder.Create(this);

                stackBuilder.AddParentStack(Java.Lang.Class.FromType(typeof(ch1503SecondActivity)));

                stackBuilder.AddNextIntent(secondIntent);

                const int pendingIntentId = 0;

                PendingIntent pendingIntent = stackBuilder.GetPendingIntent(pendingIntentId, PendingIntentFlags.OneShot);

                // 下面的代码用于从通知返回到MainActivity

                // Intent intent = new Intent (this, typeof(MainActivity));

                // const int pendingIntentId = 0;

                // pendingIntent = PendingIntent.GetActivity (this, pendingIntentId, intent, PendingIntentFlags.OneShot);

                // builder.SetContentText("Hello World! This is my first action notification!");

                builder.SetContentIntent(pendingIntent);

                Notification notification = builder.Build();

                if (soundSw.Checked) notification.Defaults |= NotificationDefaults.Sound;

                if (vibrateSw.Checked) notification.Defaults |= NotificationDefaults.Vibrate;

                const int notificationId = 1;

                notificationManager.Notify(notificationId, notification);

                // 下面的代码用于5秒后更新通知

                // Thread.Sleep(5000);

                // builder.SetContentTitle("Updated Notification");

                // builder.SetContentText("Changed to this message after five seconds.");

                // notification = builder.Build();

                // notificationManager.Notify(notificationId, notification);

            };

        }

        private void styleSpinnerSelected(object sender, AdapterView.ItemSelectedEventArgs e)

        {

            Spinner spinner = sender as Spinner;

            switch (spinner.SelectedItem.ToString())

            {

                case "Big Text":

                    notifyMsg.Text = "这是通知消息。你可以在文本框中修改要发送的消息，";

                    notifyMsg.Text += "然后单击发送消息按钮观察效果。";

                    break;

                case "Big Picture":

                    notifyMsg.Text = "该通知包含一个图像。发送通知后，可下拉通知观察图像。";

                    break;

                case "Inbox":

                    notifyMsg.Text = "该通知包含邮件消息的摘要。发送通知后，可下拉通知观察这些摘要。";

                    break;

                default:

                    notifyMsg.Text = "Notification message text goes here.";

                    break;

            }

        }

    }

}

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