Android点击桌面小部件拉起WorkManager(CoroutineWorker)后台任务并发送Notification通知到前台通知栏，kotlin（3）

桃扇骨 2023-09-24 22:19 45阅读 0赞

## Android点击桌面小部件拉起WorkManager(CoroutineWorker)后台任务并发送Notification通知到前台通知栏，kotlin（3） ##

1、构建桌面小部件

在AndroidManifest.xml的application里面添加：

在res/xml/下面添加文件appwidget.xml：

<?xml version="1.0" encoding="utf-8"?>
    <appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
        android:initialLayout="@layout/appwidget_layout"
        android:minHeight="20dp"
        android:minWidth="200dp"
        android:previewImage="@mipmap/ic_launcher"
        android:resizeMode="horizontal|vertical"
        android:updatePeriodMillis="0"
        android:widgetCategory="home_screen" >
    </appwidget-provider>

在res/layout/下面添加appwidget\_layout.xml文件：

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@android:color/holo_red_light">
    
        <Button
            android:id="@+id/btn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:background="@color/design_default_color_surface"
            android:text="点击我" />
    
    </RelativeLayout>

实现桌面小部件的上层AppWidget.kt文件：

import android.app.PendingIntent
    import android.appwidget.AppWidgetManager
    import android.appwidget.AppWidgetProvider
    import android.content.Context
    import android.content.Intent
    import android.util.Log
    import android.widget.RemoteViews
    import androidx.work.OneTimeWorkRequestBuilder
    import androidx.work.OutOfQuotaPolicy
    import androidx.work.WorkManager
    
    
    class AppWidget : AppWidgetProvider() {
        val ACTION_CLICK = "action_click"
    
        /**
         * 接收广播事件
         */
        override fun onReceive(context: Context, intent: Intent) {
            super.onReceive(context, intent)
            Log.d(TAG, "onReceive")
    
            if (intent?.action == ACTION_CLICK) {
                Log.d(TAG, "点击小部件")
    
                val request = OneTimeWorkRequestBuilder<ForegroundWorker>()
                    .setExpedited(OutOfQuotaPolicy.DROP_WORK_REQUEST)
                    .build()
    
                WorkManager.getInstance(context)
                    .enqueue(request)
    
                Log.d(TAG, "启动任务")
            }
        }
    
        /**
         * 首次在桌面安装小部件时候调用， 将小部件上面的view组件和事件绑定。
         */
        override fun onUpdate(
            context: Context?,
            appWidgetManager: AppWidgetManager?,
            appWidgetIds: IntArray?
        ) {
            super.onUpdate(context, appWidgetManager, appWidgetIds)
            Log.d(TAG, "onUpdate")
    
            val intent = Intent(context, AppWidget::class.java)
            intent.setAction(ACTION_CLICK)
            val pendingIntent =
                PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_IMMUTABLE)
    
            // 小部件在桌面的布局
            val remoteViews = RemoteViews(context?.packageName, R.layout.appwidget_layout)
            // 事件
            remoteViews.setOnClickPendingIntent(R.id.btn, pendingIntent);
    
            // 更新AppWidget
            appWidgetManager?.updateAppWidget(appWidgetIds, remoteViews);
        }
    
        /**
         * 删除AppWidget
         */
        override fun onDeleted(context: Context, appWidgetIds: IntArray) {
            super.onDeleted(context, appWidgetIds)
            Log.d(TAG, "onDeleted")
        }
    
        override fun onDisabled(context: Context) {
            super.onDisabled(context)
            Log.d(TAG, "onDisabled")
        }
    
        /**
         * AppWidget首次创建调用
         */
        override fun onEnabled(context: Context) {
            super.onEnabled(context)
            Log.d(TAG, "onEnabled")
        }
    }

2、后台的任务，以及往通知栏发送通知。

CoroutineWorker在后台往通知栏发送通知的代码文件MyTask.kt:

import android.R
    import android.app.Notification
    import android.app.NotificationChannel
    import android.app.NotificationManager
    import android.content.Context
    import android.graphics.Color
    import android.util.Log
    import androidx.core.app.NotificationCompat
    import androidx.work.CoroutineWorker
    import androidx.work.ForegroundInfo
    import androidx.work.WorkerParameters
    
    
    fun notification(context: Context, s: String): Notification {
        var channelId = createNotificationChannel(context, "com.fly", "Foreground_Service") ?: ""
    
        return NotificationCompat.Builder(context, channelId)
            .setOngoing(true)
            .setSmallIcon(R.drawable.ic_notification_overlay)
            .setContentTitle("我的标题")
            .setContentText(s)
            .setPriority(NotificationCompat.PRIORITY_MIN)
            .setCategory(Notification.CATEGORY_SERVICE)
            .build()
    }
    
    
    private fun createNotificationChannel(
        context: Context,
        channelId: String,
        channelName: String
    ): String? {
        val channel = NotificationChannel(channelId, channelName, NotificationManager.IMPORTANCE_NONE)
        channel.lightColor = Color.BLUE
        channel.lockscreenVisibility = Notification.VISIBILITY_PRIVATE
        val service = context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
        service?.createNotificationChannel(channel)
    
        return channelId
    }
    
    
    class ForegroundWorker(private val context: Context, parameters: WorkerParameters) :
        CoroutineWorker(context, parameters) {
    
        override suspend fun getForegroundInfo(): ForegroundInfo {
            return ForegroundInfo(1, notification(context, "zhangphil"))
        }
    
        override suspend fun doWork(): Result {
            setForeground(getForegroundInfo())
    
            repeat(5) {
                Thread.sleep(1000)
                Log.d(TAG, "do work - " + it)
            }
    
            return Result.success()
        }
    }

MainActivity.kt，不需要做任何事情：

import android.os.Bundle
    import android.util.Log
    import androidx.appcompat.app.AppCompatActivity
    
    val TAG:String = "zhangphil"
    
    class MainActivity : AppCompatActivity() {
        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
            Log.d(TAG, "onCreate")
        }
    
        override fun onStart() {
            super.onStart()
            Log.d(TAG, "前台")
        }
    
        override fun onStop() {
            super.onStop()
            Log.d(TAG, "后台")
        }
    }

在AndroidManifest.xml添加权限并设置程序允许通知：

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

[Android WorkManager-CoroutineWorker后台运行发送Notification通知到前台通知栏，kotlin（2）\_zhangphil的博客-CSDN博客记得在手机的应用列表设置运行这个app允许通知。![favicon32.ico][]https://blog.csdn.net/zhangphil/article/details/129382843][Android WorkManager-CoroutineWorker_Notification_kotlin_2_zhangphil_-CSDN_app_favicon32.ico_https_blog.csdn.net_zhangphil_article_details_129382843]

[Android桌面小部件AppWidget（2）\_zhangphil的博客-CSDN博客Android桌面小部件AppWidget（2）在附录文章1的基础上，我再写一篇关于Android AppWidget的文章，本篇文章实现一个简单功能，此功能亦是对附录文章1所实现功能的增强和改进，本文的代码实现的功能：假设桌面小部件只包含一个Button和一个TextView，当点击Button后，后台启动一个服务（IntentService实现），该服务每个一秒发送一个简单的字符串![favicon32.ico][]https://blog.csdn.net/zhangphil/article/details/50461944][Android_AppWidget_2_zhangphil_-CSDN_Android_AppWidget_2_1_Android AppWidget_1_Button_TextView_Button_IntentService_favicon32.ico_https_blog.csdn.net_zhangphil_article_details_50461944]

[Android桌面小部件AppWidget（1）\_桌面小部件窗口的类\_zhangphil的博客-CSDN博客Android桌面小部件AppWidget（1）Android桌面小部件AppWidget的使用，本例假设实现一个简单的功能，窗口小部件有一个Android Button和TextView，当点击桌面小部件时候，把系统当前的毫秒事件显示在TextView里面。（1）首先需要在Androidmanifest.xml文件代码定义窗口小部件（类似广播的静态注册）：![favicon32.ico][]https://blog.csdn.net/zhangphil/article/details/50457355][Android_AppWidget_1_zhangphil_-CSDN_Android_AppWidget_1_Android_AppWidget_Android Button_TextView_TextView_1_Androidmanifest.xml_favicon32.ico_https_blog.csdn.net_zhangphil_article_details_50457355]

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