android创建通知栏（kotlin版）

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import android.app.Application
import android.app.NotificationChannel
import android.app.NotificationManager
import android.os.Build
import java.util.*

/**
 * 应用程序
 */
class BaseApplication : Application() {

    override fun onCreate() {
        super.onCreate()
        createNotificationChannel()
    }

    /**
     * 创建通知栏渠道
     */
    private fun createNotificationChannel() {
        /**
         * 在API 26+ 创建NotificationChannel
         */
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val list = ArrayList<HashMap<String, String>>()
            var hashMap: HashMap<String, String> = HashMap()
            hashMap["name"] = "聊天"
            hashMap["description"] = "聊天消息通知"
            hashMap["channel"] = Constant.notifyChannelChat
            list.add(hashMap)

            hashMap = HashMap()
            hashMap["name"] = "订阅"
            hashMap["description"] = "订阅消息通知"
            hashMap["channel"] = Constant.notifyChannelSubscription
            list.add(hashMap)

            hashMap = HashMap()
            hashMap["name"] = "推荐"
            hashMap["description"] = "推荐消息通知"
            hashMap["channel"] = Constant.notifyChannelRecommend
            list.add(hashMap)

            hashMap = HashMap()
            hashMap["name"] = "新闻"
            hashMap["description"] = "新聞消息通知"
            hashMap["channel"] = Constant.notifyChannelNews
            list.add(hashMap)

            hashMap = HashMap()
            hashMap["name"] = "其他"
            hashMap["description"] = "其他消息通知"
            hashMap["channel"] = Constant.notifyChannelOther
            list.add(hashMap)

            val notificationManager = getSystemService(NotificationManager::class.java)
            for (i in list.indices) {
                val map = list[i]
                val textName = MapUtil.getMapValue(map, "name")
                val textDescription = MapUtil.getMapValue(map, "description")
                val textChannel = MapUtil.getMapValue(map, "channel")
                val channelChat = NotificationChannel(textChannel, textName, NotificationManager.IMPORTANCE_DEFAULT).apply {
                    description = textDescription
                }
                notificationManager.createNotificationChannel(channelChat)
            }
        }
    }

}

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.widget.Button
import java.util.*

/**
 * 主界面
 */
class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        findViewById<Button>(R.id.btn_notification).setOnClickListener {
            val map = HashMap<String, String>()
            map["channel"] = "1"
            map["title"] = "张三"
            map["content"] = "你最近还好吗?"
            map["big_text"] = "-------------------------------------------------------------"
            // https://developer.android.com/training/notify-user/build-notification?hl=zh-cn#java
            NotificationUtil.sendNotification(this, map)
        }
    }

}

import android.app.PendingIntent
import android.content.Context
import android.content.Intent
import android.media.RingtoneManager
import android.support.v4.app.NotificationCompat
import android.support.v4.app.NotificationManagerCompat
import android.text.TextUtils
import java.util.*

/**
 * 通知栏工具类
 */
object NotificationUtil {

    fun sendNotification(context: Context?, map: Map<String, String>?) {
        if (context != null && map != null) {
            val channel = MapUtil.getMapValue(map, "channel", "0")
            val channelId = Constant.notifyChannelOther
            when (channel) {
                "0" -> Constant.notifyChannelOther
                "1" -> Constant.notifyChannelChat
                "2" -> Constant.notifyChannelNews
                "3" -> Constant.notifyChannelRecommend
                "4" -> Constant.notifyChannelSubscription
            }
            val title = MapUtil.getMapValue(map, "title")
            val content = MapUtil.getMapValue(map, "content")
            // 设置通知内容，构造函数要求您提供通道ID。这是与Android 8.0（API级别26）及更高版本兼容所必需的，但旧版本会忽略这一点
            var mBuilder = NotificationCompat.Builder(context, channelId)
                    .setSmallIcon(R.drawable.notification_icon)
                    .setContentTitle(title)
                    .setContentText(content)
                    .setPriority(NotificationCompat.PRIORITY_DEFAULT)
                    .setAutoCancel(true)
                    .setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION))
            val bigText = MapUtil.getMapValue(map, "big_text")
            // 如果bigText的值不为空
            if (!TextUtils.isEmpty(bigText)) {
                // 如果您希望通知更长，可以通过添加样式模板来启用可扩展通知
                mBuilder.setStyle(NotificationCompat.BigTextStyle().bigText(bigText))
            }

            // 为应用中的活动创建明确的意图
            val intent = Intent(context, NotificationClickReceiver::class.java).apply {
                action = NotificationClickReceiver.noticeClick
                putExtras(MapUtil.getBundle(map))
            }
            val pendingIntent = PendingIntent.getBroadcast(context, Random().nextInt(1000), intent, PendingIntent.FLAG_UPDATE_CURRENT)
            mBuilder.setContentIntent(pendingIntent)

            // 显示通知，注意：从Android 8.1（API级别27）开始，应用程序无法每秒发出超过一次的通知。
            // 如果您的应用在一秒钟内发布了多个通知，则它们都会按预期显示，但每秒只有第一个通知发出声音
            with(NotificationManagerCompat.from(context)) {
                // notificationId is a unique int for each notification that you must define
                notify(Random().nextInt(1000), mBuilder.build())
            }
        }
    }

}

import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import android.widget.Toast

/**
 * 监听通知栏点击事件
 */
class NotificationClickReceiver : BroadcastReceiver() {

    companion object {
        const val noticeClick = "android.intent.action.noticeClick"
    }

    override fun onReceive(context: Context?, intent: Intent?) {
        if (context != null && intent != null && intent.action != null && intent.action == noticeClick) {
            // 通知栏被点击
            val bundle = intent.extras
            if (bundle != null) {
                Toast.makeText(context, "收到消息", Toast.LENGTH_SHORT).show()
            }
        }
    }

}

import android.os.Bundle
import android.text.TextUtils

/**
 * Map工具类
 */
object MapUtil {

    /**
     * 根据map的key取map的值
     */
    fun getMapValue(map: Map<String, String>, key: String): String {
        // 因为map为非安全的，map的key和value有可能为null，所以要加入判断，在取值时可以附加一个空字符串来避免空指针
        return if (map.containsKey(key)) map[key] + "" else ""
    }

    /**
     * 根据map的key取map的值，当map的值为空时取传过来的默认值
     */
    fun getMapValue(map: Map<String, String>, key: String, defaultValue: String): String {
        // 因为map为非安全的，map的key和value有可能为null，所以要加入判断，在取值时可以附加一个空字符串来避免空指针
        return if (map.containsKey(key)) {
            val value = map[key]
            return when {value != null -> value
                else -> defaultValue
            }
        } else {
            defaultValue
        }
    }

    /**
     * 把map转换成bundle
     */
    fun getBundle(map: Map<String, String>): Bundle {
        val bundle = Bundle()
        for ((key, value) in map) {
            if (!TextUtils.isEmpty(key)) {
                bundle.putString(key, value)
            }
        }
        return bundle
    }

}

/**
 * 常量类
 */
object Constant {

    // 通知渠道ID：即时通讯
    const val notifyChannelChat = "chat"
    // 通知渠道ID：订阅笋盘
    const val notifyChannelSubscription = "subscription"
    // 通知渠道ID：物件推荐
    const val notifyChannelRecommend = "recommend"
    // 通知渠道ID：地产新闻
    const val notifyChannelNews = "news"
    // 通知渠道ID：其他通知
    const val notifyChannelOther = "other"

}

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

    <application
        android:name=".BaseApplication">

        <receiver android:name=".NotificationClickReceiver">
            <intent-filter>
                <action android:name="android.intent.action.noticeClick" />
            </intent-filter>
        </receiver>

    </application>

</manifest>

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android创建通知栏（kotlin版）

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