Schedule a Task in Android using ALARM_SERVICE service in Gluon-mobile

Question

I have referred from this link and tried this code So far.But I don't know to implement this code in gluon-mobile.What I intent to do is that I want to start an Indent that does some Job in background at a specific time.My problem is that I don't how gluon-mobile behaves.So help me complete it.

package com.application;

import java.util.Calendar;

import android.app.AlarmManager; 
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import javafxports.android.FXActivity;

 public class Schedular {

AlarmManager manager=null;
FXActivity activity=null;
  public Schedular()
{
 manager=(AlarmManager) FXActivity.getInstance().getSystemService(Context.ALARM_SERVICE);
  activity=FXActivity.getInstance();
}

public void schedule()
{

    Intent indent = new Intent(activity,Alarm.class);
    PendingIntent pIntent = PendingIntent.getBroadcast(activity, 0, indent, 0);

manager.set(AlarmManager.RTC_WAKEUP, SystemClock.elapsedRealtime()+2*1000,indent);  //This is Where I went Wrong

}
}

I want to schedule a task at specific timing given by the user at the Run-time,That's what the function public void schedule(Calendar calendar,boolean flag) does.

Alarm.class

 public class Alarm extends BroadcastReceiver
 {

 @Override
 public void onReceive(Context context, Intent intent)
 {

     // Your code to execute when the alarm triggers
     // and the broadcast is received.   
    new bluetooth.turnOn();  
 }

And I have added Alarm.class to AndroidManifest.xml as

 <?xml version="1.0" encoding="UTF-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.application" android:versionCode="1" android:versionName="1.0">
    <supports-screens android:xlargeScreens="true"/>

    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />

    <uses-sdk android:minSdkVersion="3" android:targetSdkVersion="26"/>


    <application android:label="Wifischeduler" android:name="android.support.multidex.MultiDexApplication" android:icon="@mipmap/ic_launcher">

            <activity android:name="javafxports.android.FXActivity" android:label="Wifischeduler" android:configChanges="orientation|screenSize">
                    <meta-data android:name="main.class" android:value="com.application.Main"/>
                    <meta-data android:name="debug.port" android:value="0"/>
                    <intent-filter>
                            <action android:name="android.intent.action.MAIN"/>
                            <category android:name="android.intent.category.LAUNCHER"/>
                    </intent-filter>
            </activity>

        <activity android:name="com.gluonhq.impl.charm.down.plugins.android.NotificationActivity"
                       android:parentActivityName="javafxports.android.FXActivity">
           <meta-data android:name="android.support.PARENT_ACTIVITY" 
                 android:value="javafxports.android.FXActivity"/>
     </activity>

 <activity android:name="com.application.AndroidPlatform$PermissionRequestActivity" />

<receiver android:name="com.application.Alarm"  />  // this is where I have included the Alarm.class

<receiver android:name="com.gluonhq.impl.charm.down.plugins.android.AlarmReceiver" />


    </application>

When the schedule method is called the app exits... I have run adb logcat -v threadtime and got this output on cmd

--------- beginning of crash
07-22 09:21:44.878 13516 13516 E AndroidRuntime: FATAL EXCEPTION: main
07-22 09:21:44.878 13516 13516 E AndroidRuntime: Process:    com.application, PID: 13516
07-22 09:21:44.878 13516 13516 E AndroidRuntime: java.lang.RuntimeException: Unable to instantiate receiver com.application.Alarm: java.lang.IllegalAccessException: java.lang.Class<com.application.Alarm> is not accessible from java.lang.Class<android.app.ActivityThread>
 07-22 09:21:44.878 13516 13516 E AndroidRuntime:        at android.app.ActivityThread.handleReceiver(ActivityThread.java:2739)
 07-22 09:21:44.878 13516 13516 E AndroidRuntime:        at android.app.ActivityThread.access$1900(ActivityThread.java:153)
 07-22 09:21:44.878 13516 13516 E AndroidRuntime:        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1452)
 07-22 09:21:44.878 13516 13516 E AndroidRuntime:        at android.os.Handler.dispatchMessage(Handler.java:102)
 07-22 09:21:44.878 13516 13516 E AndroidRuntime:        at android.os.Looper.loop(Looper.java:154)
07-22 09:21:44.878 13516 13516 E AndroidRuntime:        at android.app.ActivityThread.main(ActivityThread.java:5529)
07-22 09:21:44.878 13516 13516 E AndroidRuntime:        at java.lang.reflect.Method.invoke(Native Method)
07-22 09:21:44.878 13516 13516 E AndroidRuntime:        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:739)
07-22 09:21:44.878 13516 13516 E AndroidRuntime:        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:629)
07-22 09:21:44.878 13516 13516 E AndroidRuntime: Caused by: java.lang.IllegalAccessException: java.lang.Class<com.application.Alarm> is not accessible from java.lang.Class<android.app.ActivityThread>
07-22 09:21:44.878 13516 13516 E AndroidRuntime:        at java.lang.Class.newInstance(Native Method)
07-22 09:21:44.878 13516 13516 E AndroidRuntime:        at android.app.ActivityThread.handleReceiver(ActivityThread.java:2734)
07-22 09:21:44.878 13516 13516 E AndroidRuntime:        ... 8 more
07-22 09:21:44.885  1804  3742 D StatusBar: onNotificationPosted:  Key: 0|com.application|123456|charm://down/Id/abcd12340|10276 GroupKey: 0|com.application|123456|charm://down/Id/abcd12340|10276 Connected: true
07-22 09:21:44.885  1804  1804 D StatusBar:  GroupChild: false  GroupsContainsKey: false  IsUpdate: false IsGroupSummary: false hasIcon: true
07-22 09:21:44.886  1804  1804 D PhoneStatusBar: addNotification pkg=com.application;basepkg=com.application;id=123456
07-22 09:21:44.888  3047 10359 I GCoreUlr: Successfully inserted 1 locations
07-22 09:21:44.922  1804  1804 W ProgressBarDelegate: Unknown Drawable subclass, src=android.graphics.drawable.ScaleDrawable@eb9196
07-22 09:21:44.922  1804  1804 W ProgressBarDelegate: Unknown Drawable subclass, src=android.graphics.drawable.ScaleDrawable@aace117
07-22 09:21:44.932  3451  3518 I octvm_klo: klo lock

I have no idea why I can't Instantiate a Receiver (Alarm.class),

@FXML void start()
{

    try{

    Schedule schedule =(Schedule) Class.forName("com.application.Schedular").newInstance();


    schedule.schedule();

    }

let's just say that i want to start a indent that turn on bluetooth at a specific how to accomplish that ? @Mani — guru_007, Jul 20 '17 at 08:35
For Bluetooth refer this https://stackoverflow.com/a/6276516/2700586 — Mani, Jul 20 '17 at 08:41
Well,I have modified as suggested still not working ! i dont know where i went wrong! — guru_007, Jul 21 '17 at 03:41
Can you post the Java classes, or at least those where you call the Android implementation, so we can see how you call from the Main package classes those on the Android one? Otherwise it is very hard to guess. — José Pereda, Jul 22 '17 at 09:17

score 2 · Accepted Answer · answered Jul 22 '17 at 10:27

Your code didn't exactly work for me: I had to change the intent to the pIntent in schedule(), and I changed Schedule to Class on the Java implementation (how do you import it anyway?). Other than that, it was running fine for me (using Android target 25), and I didn't have any exception.

I'll post the initial solution (based on your approach), and after that a better way to do it.

Initial solution

While the preferred way to add platform specific code is following Charm Down design pattern (see https://bitbucket.org/gluon-oss/charm-down), a very quick and dirty way of getting the Android code working is this:

Android

Scheduler.java

package com.gluonhq.scheduler.android;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.SystemClock;
import javafxports.android.FXActivity;

public class Scheduler {

    private final AlarmManager manager;

    public Scheduler() {
        manager = (AlarmManager) FXActivity.getInstance().getSystemService(Context.ALARM_SERVICE);
        Intent indent = new Intent(FXActivity.getInstance(), AlarmReceiver.class);
        PendingIntent pIntent = PendingIntent.getBroadcast(FXActivity.getInstance(), 0, indent, 0);

        manager.set(AlarmManager.RTC_WAKEUP, SystemClock.elapsedRealtime() + 2000, pIntent); 
    }
}

AlarmReceiver.java

package com.gluonhq.scheduler.android;

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

public class AlarmReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        Toast.makeText(context, "Alarm ON", Toast.LENGTH_LONG).show();
    }

}

AndroidManifest.xml

<?xml version="1.0" encoding="UTF-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.gluonhq.scheduler" android:versionCode="1" android:versionName="1.0">
        <supports-screens android:xlargeScreens="true"/>
        <uses-permission android:name="android.permission.INTERNET"/>
        <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
        <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
        <uses-sdk android:minSdkVersion="4" android:targetSdkVersion="25"/>
        <application android:label="GluonScheduler" android:name="android.support.multidex.MultiDexApplication" android:icon="@mipmap/ic_launcher">
                <activity android:name="javafxports.android.FXActivity" android:label="GluonScheduler" android:configChanges="orientation|screenSize">
                        <meta-data android:name="main.class" android:value="com.gluonhq.scheduler.GluonScheduler"/>
                        <meta-data android:name="debug.port" android:value="0"/>
                        <intent-filter>
                                <action android:name="android.intent.action.MAIN"/>
                                <category android:name="android.intent.category.LAUNCHER"/>
                        </intent-filter>
                </activity>
                <receiver android:name="com.gluonhq.scheduler.android.AlarmReceiver" />
        </application>
</manifest

Main/Java

This is a Basic View from a Single view template project using the Gluon IDE plugin:

GluonScheduler.java

package com.gluonhq.scheduler;

import com.gluonhq.charm.glisten.application.MobileApplication;
import com.gluonhq.charm.glisten.visual.Swatch;
import javafx.scene.Scene;
import javafx.scene.image.Image;
import javafx.stage.Stage;

public class GluonScheduler extends MobileApplication {

    public static final String BASIC_VIEW = HOME_VIEW;

    @Override
    public void init() {
        addViewFactory(BASIC_VIEW, () -> new BasicView(BASIC_VIEW));
    }

    @Override
    public void postInit(Scene scene) {
        Swatch.BLUE.assignTo(scene);

        ((Stage) scene.getWindow()).getIcons().add(new Image(GluonScheduler.class.getResourceAsStream("/icon.png")));
    }
}

BasicView.java

package com.gluonhq.scheduler;

import com.gluonhq.charm.glisten.control.AppBar;
import com.gluonhq.charm.glisten.control.Icon;
import com.gluonhq.charm.glisten.mvc.View;
import com.gluonhq.charm.glisten.visual.MaterialDesignIcon;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.geometry.Pos;
import javafx.scene.control.Button;
import javafx.scene.layout.VBox;

public class BasicView extends View {

    public BasicView(String name) {
        super(name);

        Button button = new Button("Schedule task");
        button.setGraphic(new Icon(MaterialDesignIcon.ALARM_ON));
        button.setOnAction(e -> {

            try {
                Class c = Class.forName("com.gluonhq.scheduler.android.Scheduler");
                c.newInstance();
            } catch (ClassNotFoundException | InstantiationException | IllegalAccessException ex) {
                Logger.getLogger(BasicView.class.getName()).log(Level.SEVERE, null, ex);
            }

        });

        VBox controls = new VBox(button);
        controls.setAlignment(Pos.CENTER);

        setCenter(controls);
    }

    @Override
    protected void updateAppBar(AppBar appBar) {
        appBar.setNavIcon(MaterialDesignIcon.MENU.button(e -> System.out.println("Menu")));
        appBar.setTitleText("Basic View");
    }
}

build.gradle

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'org.javafxports:jfxmobile-plugin:1.3.6'
    }
}

apply plugin: 'org.javafxports.jfxmobile'

repositories {
    jcenter()
    maven {
        url 'http://nexus.gluonhq.com/nexus/content/repositories/releases'
    }
}

mainClassName = 'com.gluonhq.scheduler.GluonScheduler'

dependencies {
    compile 'com.gluonhq:charm:4.3.5'
}

jfxmobile {
    downConfig {
        version = '3.3.0'
        // Do not edit the line below. Use Gluon Mobile Settings in your project context menu instead
        plugins 'display', 'lifecycle', 'statusbar', 'storage'
    }
    android {
        manifest = 'src/android/AndroidManifest.xml'
    }
    ios {
        infoPList = file('src/ios/Default-Info.plist')
        forceLinkClasses = [
                'com.gluonhq.**.*',
                'javax.annotations.**.*',
                'javax.inject.**.*',
                'javax.json.**.*',
                'org.glassfish.json.**.*'
        ]
    }
}

Deploy to your Android device (./gradlew androidInstall) and run. Press the button and two seconds later you will see the toast:

Preferred solution

AlarmService

While the above code works, it is not very convenient to use Class.forName.

Following the Charm Down services (LocalNotification for instance), I'd do it this way instead (you have to keep the same package names):

Java

AlarmService.java

package com.gluonhq.charm.down.plugins;

public interface AlarmService {
    public void schedule();
}

AlarmServiceFactory.java

package com.gluonhq.charm.down.plugins;

import com.gluonhq.charm.down.DefaultServiceFactory;

public class AlarmServiceFactory extends DefaultServiceFactory<AlarmService> {

    public AlarmServiceFactory() {
        super(AlarmService.class);
    }

}

Android

AndroidAlarmService.java

package com.gluonhq.charm.down.plugins.android;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.SystemClock;
import com.gluonhq.charm.down.plugins.AlarmService;
import com.gluonhq.scheduler.android.AlarmReceiver;
import javafxports.android.FXActivity;

public class AndroidAlarmService implements AlarmService {

    private final AlarmManager manager;
    private final FXActivity activity;

    public AndroidAlarmService() {
        activity = FXActivity.getInstance();
        manager = (AlarmManager) activity.getSystemService(Context.ALARM_SERVICE);
    }
    @Override
    public void schedule() {
        Intent indent = new Intent(activity, AlarmReceiver.class);
        PendingIntent pIntent = PendingIntent.getBroadcast(activity, 0, indent, 0);

        manager.set(AlarmManager.RTC_WAKEUP, SystemClock.elapsedRealtime() + 2000, pIntent); 
    }

}

(keeping the same AlarmReceiver class as above).

Finally, on your view:

BasicView.java

button.setOnAction(e -> 
        Services.get(AlarmService.class).ifPresent(AlarmService::schedule));

Now you can deploy and run again, and the result will be the same. But obviously this preferred way has many more advantages.

Using the service you can also run on desktop or deploy to iOS: the app will work (when clicking the button it won't do anything).
You can implement solutions for desktop and iOS if you need to.
You can easily add more functionality through the interface.

Any idea about [this](https://stackoverflow.com/questions/43965021/creating-custom-android-notifications-using-gluon-mobile) @JosePereda — guru_007, Jul 26 '17 at 13:19

Mani · Answer 2 · 2017-07-20T08:37:08.777

1

Replace the indent

by

manager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 10L, pIntent);

Also to the constructor of indent, pass desired "activity" or "service"

Intent intent = new Intent(context, AlarmReceiver.class); //AlarmReceiver is an activity that will be launched after an hour
PendingIntent pIntent = PendingIntent.getBroadcast(context, 0, intent, 0);

alarmMgr.set(AlarmManager.ELAPSED_REALTIME_WAKEUP,
        SystemClock.elapsedRealtime() +
        60 * 1000, pIntent); //60mins from now

edited Jul 20 '17 at 08:37

answered Jul 20 '17 at 08:31

Mani

2,599
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what is the **context** in Indent mean? – guru_007 Jul 20 '17 at 08:38
As per your code, it should be FXActivity.getInstance(). Its an activity/application instance! – Mani Jul 20 '17 at 08:39
What does AlarmReceiver.class do,it is predefined ? – guru_007 Jul 20 '17 at 08:49
Its an another activity, In your case you can define a service that will launch bluetooth settings – Mani Jul 20 '17 at 08:50
can you provide me any example? – guru_007 Jul 20 '17 at 08:52
example of? Be specific in query – Mani Jul 20 '17 at 09:04
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/149688/discussion-between-mani-and-guru-007). – Mani Jul 20 '17 at 09:13

Schedule a Task in Android using ALARM_SERVICE service in Gluon-mobile

2 Answers2

Initial solution

Preferred solution

Linked