【Android】15.5 例15-3—Notification的各种属性演示

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;
}
}
}
}