如何使用工作管理器在Android中设置多个通知？

Question

I have implemented background notifications using this article: Click Here To View The Article

It sets the notification for future time. But it sets only one notification i want to set multiple notifications. And also sometimes it doesn't show the notification on the time that i have set and it shows when i open the app.

Here is my Activity code:

private void saveData() {
        long currentTime = System.currentTimeMillis();
        //currentTime is the system current time when user sets the notification.

        if (closingMilliSeconds > currentTime) {
            //closingMilliSeconds is the future time when the notification should show up.
            Data data = new Data.Builder().putInt(NOTIFICATION_ID, 0).build();
            long delay = closingMilliSeconds - currentTime;
            //delay is the time difference between current time and the future time when the notification should show up.
            scheduleNotification(delay, data);
        }
    }

    private void scheduleNotification(long delay, Data data) {
        OneTimeWorkRequest notificationWork = new OneTimeWorkRequest.Builder(NotifyWork.class)
                .setInitialDelay(delay, TimeUnit.MILLISECONDS)
                .setInputData(data)
                .build();
        WorkManager instanceWorkManager = WorkManager.getInstance(this);
        instanceWorkManager.beginUniqueWork(NOTIFICATION_WORK, REPLACE, notificationWork).enqueue();
    }

NotifyWork Class

package com.example.wongsigntenders.notificationHandler.work

import android.app.NotificationChannel
import android.app.NotificationManager
import android.app.NotificationManager.IMPORTANCE_HIGH
import android.app.PendingIntent.getActivity
import android.content.Context
import android.content.Context.NOTIFICATION_SERVICE
import android.content.Intent
import android.content.Intent.FLAG_ACTIVITY_CLEAR_TASK
import android.content.Intent.FLAG_ACTIVITY_NEW_TASK
import android.graphics.Color.RED
import android.media.AudioAttributes
import android.media.AudioAttributes.CONTENT_TYPE_SONIFICATION
import android.media.AudioAttributes.USAGE_NOTIFICATION_RINGTONE
import android.media.RingtoneManager.TYPE_NOTIFICATION
import android.media.RingtoneManager.getDefaultUri
import android.os.Build.VERSION.SDK_INT
import android.os.Build.VERSION_CODES.O
import androidx.core.app.NotificationCompat
import androidx.core.app.NotificationCompat.DEFAULT_ALL
import androidx.core.app.NotificationCompat.PRIORITY_MAX
import androidx.work.ListenableWorker.Result.success
import androidx.work.Worker
import androidx.work.WorkerParameters
import com.example.wongsigntenders.R
import com.example.wongsigntenders.activities.MainActivity
import com.example.wongsigntenders.notificationHandler.extension.vectorToBitmap

class NotifyWork(context: Context, params: WorkerParameters) : Worker(context, params) {

    override fun doWork(): Result {
        val id: Int = inputData.getInt(NOTIFICATION_ID, 0)
        sendNotification(id)

        return success()
    }

    private fun sendNotification(id: Int) {
        val intent = Intent(applicationContext, MainActivity::class.java)
        intent.flags = FLAG_ACTIVITY_NEW_TASK or FLAG_ACTIVITY_CLEAR_TASK
        intent.putExtra(NOTIFICATION_ID, id)

        val notificationManager =
            applicationContext.getSystemService(NOTIFICATION_SERVICE) as NotificationManager

        val bitmap = applicationContext.vectorToBitmap(R.drawable.ic_info_24)
        val titleNotification = "Wongsign Tenders"
        val subtitleNotification = "My Wongsign Tender Notification...!!!"
        val pendingIntent = getActivity(applicationContext, 0, intent, 0)
        val notification = NotificationCompat.Builder(applicationContext, NOTIFICATION_CHANNEL)
            .setLargeIcon(bitmap).setSmallIcon(R.drawable.ic_info_24)
            .setContentTitle(titleNotification).setContentText(subtitleNotification)
            .setDefaults(DEFAULT_ALL).setContentIntent(pendingIntent).setAutoCancel(true)

        notification.priority = PRIORITY_MAX

        if (SDK_INT >= O) {
            notification.setChannelId(NOTIFICATION_CHANNEL)

            val ringtoneManager = getDefaultUri(TYPE_NOTIFICATION)
            val audioAttributes = AudioAttributes.Builder().setUsage(USAGE_NOTIFICATION_RINGTONE)
                .setContentType(CONTENT_TYPE_SONIFICATION).build()

            val channel =
                NotificationChannel(NOTIFICATION_CHANNEL, NOTIFICATION_NAME, IMPORTANCE_HIGH)

            channel.enableLights(true)
            channel.lightColor = RED
            channel.enableVibration(true)
            channel.vibrationPattern = longArrayOf(400, 500)
            channel.setSound(ringtoneManager, audioAttributes)
            notificationManager.createNotificationChannel(channel)
        }

        notificationManager.notify(id, notification.build())
    }

    companion object {
        const val NOTIFICATION_ID = "appName_notification_id"
        const val NOTIFICATION_NAME = "appName"
        const val NOTIFICATION_CHANNEL = "appName_channel_01"
        const val NOTIFICATION_WORK = "appName_notification_work"
    }
}

VectorToBitmap Converter

package com.example.wongsigntenders.notificationHandler.extension

import android.content.Context
import android.graphics.Bitmap
import android.graphics.Bitmap.createBitmap
import android.graphics.Canvas
import androidx.core.content.ContextCompat.getDrawable

fun Context.vectorToBitmap(drawableId: Int): Bitmap? {
    val drawable = getDrawable(this, drawableId) ?: return null
    val bitmap = createBitmap(
        drawable.intrinsicWidth, drawable.intrinsicHeight, Bitmap.Config.ARGB_8888
    ) ?: return null
    val canvas = Canvas(bitmap)
    drawable.setBounds(0, 0, canvas.width, canvas.height)
    drawable.draw(canvas)
    return bitmap
}

For further details you can have a look on This Article

Thanks in advance. Please let me know if anyone can help.

Answer 1

I have implemented background notifications using this article: Click Here To View The Article

It sets the notification for future time. But it sets only one notification i want to set multiple notifications. And also sometimes it doesn't show the notification on the time that i have set and it shows when i open the app.

Here is my Activity code:

private void saveData() {
        long currentTime = System.currentTimeMillis();
        //currentTime is the system current time when user sets the notification.

        if (closingMilliSeconds > currentTime) {
            //closingMilliSeconds is the future time when the notification should show up.
            Data data = new Data.Builder().putInt(NOTIFICATION_ID, 0).build();
            long delay = closingMilliSeconds - currentTime;
            //delay is the time difference between current time and the future time when the notification should show up.
            scheduleNotification(delay, data);
        }
    }

    private void scheduleNotification(long delay, Data data) {
        OneTimeWorkRequest notificationWork = new OneTimeWorkRequest.Builder(NotifyWork.class)
                .setInitialDelay(delay, TimeUnit.MILLISECONDS)
                .setInputData(data)
                .build();
        WorkManager instanceWorkManager = WorkManager.getInstance(this);
        instanceWorkManager.beginUniqueWork(NOTIFICATION_WORK, REPLACE, notificationWork).enqueue();
    }

NotifyWork Class

package com.example.wongsigntenders.notificationHandler.work

import android.app.NotificationChannel
import android.app.NotificationManager
import android.app.NotificationManager.IMPORTANCE_HIGH
import android.app.PendingIntent.getActivity
import android.content.Context
import android.content.Context.NOTIFICATION_SERVICE
import android.content.Intent
import android.content.Intent.FLAG_ACTIVITY_CLEAR_TASK
import android.content.Intent.FLAG_ACTIVITY_NEW_TASK
import android.graphics.Color.RED
import android.media.AudioAttributes
import android.media.AudioAttributes.CONTENT_TYPE_SONIFICATION
import android.media.AudioAttributes.USAGE_NOTIFICATION_RINGTONE
import android.media.RingtoneManager.TYPE_NOTIFICATION
import android.media.RingtoneManager.getDefaultUri
import android.os.Build.VERSION.SDK_INT
import android.os.Build.VERSION_CODES.O
import androidx.core.app.NotificationCompat
import androidx.core.app.NotificationCompat.DEFAULT_ALL
import androidx.core.app.NotificationCompat.PRIORITY_MAX
import androidx.work.ListenableWorker.Result.success
import androidx.work.Worker
import androidx.work.WorkerParameters
import com.example.wongsigntenders.R
import com.example.wongsigntenders.activities.MainActivity
import com.example.wongsigntenders.notificationHandler.extension.vectorToBitmap

class NotifyWork(context: Context, params: WorkerParameters) : Worker(context, params) {

    override fun doWork(): Result {
        val id: Int = inputData.getInt(NOTIFICATION_ID, 0)
        sendNotification(id)

        return success()
    }

    private fun sendNotification(id: Int) {
        val intent = Intent(applicationContext, MainActivity::class.java)
        intent.flags = FLAG_ACTIVITY_NEW_TASK or FLAG_ACTIVITY_CLEAR_TASK
        intent.putExtra(NOTIFICATION_ID, id)

        val notificationManager =
            applicationContext.getSystemService(NOTIFICATION_SERVICE) as NotificationManager

        val bitmap = applicationContext.vectorToBitmap(R.drawable.ic_info_24)
        val titleNotification = "Wongsign Tenders"
        val subtitleNotification = "My Wongsign Tender Notification...!!!"
        val pendingIntent = getActivity(applicationContext, 0, intent, 0)
        val notification = NotificationCompat.Builder(applicationContext, NOTIFICATION_CHANNEL)
            .setLargeIcon(bitmap).setSmallIcon(R.drawable.ic_info_24)
            .setContentTitle(titleNotification).setContentText(subtitleNotification)
            .setDefaults(DEFAULT_ALL).setContentIntent(pendingIntent).setAutoCancel(true)

        notification.priority = PRIORITY_MAX

        if (SDK_INT >= O) {
            notification.setChannelId(NOTIFICATION_CHANNEL)

            val ringtoneManager = getDefaultUri(TYPE_NOTIFICATION)
            val audioAttributes = AudioAttributes.Builder().setUsage(USAGE_NOTIFICATION_RINGTONE)
                .setContentType(CONTENT_TYPE_SONIFICATION).build()

            val channel =
                NotificationChannel(NOTIFICATION_CHANNEL, NOTIFICATION_NAME, IMPORTANCE_HIGH)

            channel.enableLights(true)
            channel.lightColor = RED
            channel.enableVibration(true)
            channel.vibrationPattern = longArrayOf(400, 500)
            channel.setSound(ringtoneManager, audioAttributes)
            notificationManager.createNotificationChannel(channel)
        }

        notificationManager.notify(id, notification.build())
    }

    companion object {
        const val NOTIFICATION_ID = "appName_notification_id"
        const val NOTIFICATION_NAME = "appName"
        const val NOTIFICATION_CHANNEL = "appName_channel_01"
        const val NOTIFICATION_WORK = "appName_notification_work"
    }
}

VectorToBitmap Converter

package com.example.wongsigntenders.notificationHandler.extension

import android.content.Context
import android.graphics.Bitmap
import android.graphics.Bitmap.createBitmap
import android.graphics.Canvas
import androidx.core.content.ContextCompat.getDrawable

fun Context.vectorToBitmap(drawableId: Int): Bitmap? {
    val drawable = getDrawable(this, drawableId) ?: return null
    val bitmap = createBitmap(
        drawable.intrinsicWidth, drawable.intrinsicHeight, Bitmap.Config.ARGB_8888
    ) ?: return null
    val canvas = Canvas(bitmap)
    drawable.setBounds(0, 0, canvas.width, canvas.height)
    drawable.draw(canvas)
    return bitmap
}

For further details you can have a look on This Article

Thanks in advance. Please let me know if anyone can help.