如何使用 Kotlin 创建通知提醒?
kotlin apps/applicationsmobile development更新于 2026/2/12 9:37:17
此示例演示了如何使用 Kotlin 创建通知提醒。
步骤 1 − 在 Android Studio 中创建一个新项目，转到"文件"->"新建项目"，并填写所有必需的详细信息以创建新项目。
步骤 2 − 将以下代码添加到 res/layout/activity_main.xml。
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <Button android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:onClick="btnNotify" android:text="Show Notification" /> </RelativeLayout>
步骤 3 − 将以下代码添加到 src/MainActivity.kt
package app.com.kotlinapp
import android.app.*
import android.content.Context
import android.content.Intent
import android.graphics.BitmapFactory
import android.graphics.Color
import android.os.Build
import android.os.Bundle
import android.view.View
import androidx.appcompat.app.AppCompatActivity
class MainActivity : AppCompatActivity() {
lateinit var notificationChannel: NotificationChannel
lateinit var notificationManager: NotificationManager
lateinit var builder: Notification.Builder
private val channelId = "12345"
private val description = "Test Notification"
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as
NotificationManager
}
fun btnNotify(view: View) {
val intent = Intent(this, LauncherActivity::class.java)
val pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT)
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
notificationChannel = NotificationChannel(channelId, description, NotificationManager .IMPORTANCE_HIGH)
notificationChannel.lightColor = Color.BLUE notificationChannel.enableVibration(true)
notificationManager.createNotificationChannel(notificationChannel)
builder = Notification.Builder(this, channelId).setContentTitle("NOTIFICATION USING " +
"KOTLIN").setContentText("Test Notification").setSmallIcon(R.drawable .ic_brightness).setLargeIcon(BitmapFactory.decodeResource(this.resources, R.drawable
.ic_launcher_background)).setContentIntent(pendingIntent)
}
notificationManager.notify(12345, builder.build())
}
}
步骤 4 − 将以下代码添加到 androidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.kotlinapp"> <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/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
让我们尝试运行您的应用程序。假设您已将实际的 Android 移动设备连接到电脑。要从 Android Studio 运行该应用程序，请打开项目的某个 Activity 文件，然后点击工具栏上的"运行"
图标。选择您的移动设备作为选项，然后检查您的移动设备是否显示您的默认屏幕 −
点击此处下载项目代码。
