I am trying to write an app that checks in with a server every X seconds.
I was able to make it work, but only when the application is running and active (not sure if it can be minimized, was not able to test it clearly) and the device is not locked. I would like for the checking to continue even if I lock the device or do other things on it.
From my searches, it seems like I should use service, but I was not able to figure out how to implement it with what I am trying to do. Or is there something else that could do this?
What I need to and failed to do is this:
User checks a CheckBox - start the service
Create the service and pass some information to it
Create an instance of my class in the service using the passed information
Call this instance's method every X seconds in a new thread (the method returns true/false)
Listen to ?something and if the method returns true then stop the service and notify user
If the user unchecks the CheckBox, stop the service.
I tried doing this, but I was unable to get any information out of the thread and out of the service. Is there a way to do so?
Starting the service from activity for example and binding it with your app
//make these 2 variables as fields in Activity for example
YourService yourService = null;
//this variable can be used for checking if your activity are binded already or not
boolean mBounded = false;
Intent mIntent = new Intent(this, YourService.class);
startService(mIntent);
bindService(mIntent, mConnection, BIND_AUTO_CREATE);
ServiceConnection mConnection = new ServiceConnection() {
public void onServiceDisconnected(ComponentName name) {
mBounded = false;
yourService = null;
}
public void onServiceConnected(ComponentName name, IBinder service) {
mBounded = true;
YourService.LocalBinder mLocalBinder = (YourService.LocalBinder) service;
yourService= mLocalBinder.getServerInstance();
}
};
Do not forget that you can use methods from Service in Activity only after it is bound to your Activity. In other words it is available only after onServiceConnected is executed.
So you have now service and activity who can communicate with each other.
For example you can call in Activity some public method of your Service, like
if (yourService != null)
yourService.test();
If you want to call your Activity methods in Service you should pass it to Service with simple setter.
If you want to stop Service its kinda easy too:
Intent mIntent = new Intent(this, YourService.class);
stopService(mIntent);
For doing request every X service:
1) You can do infinity separate thread inside Service and do request after delay for X seconds.
2) For checking every X seconds you can use something like AlarmManager.
3) Also its possible to use CountDownTimer inside your Service to do some requests to server.
If you want to create your Service after reboot if CheckBox was set, its easy too. So you should use simple BroadcastReceiver.
First of all you should save your CheckBox setting in SharedPreferences, then run your Service if you need.
public class SimpleReceiver extends WakefulBroadcastReceiver{
#Override
public void onReceive(Context context, Intent intent) {
//run below code if you need, depends on your saved value of Checkbox in SharedPreferences
Intent serviceIntent = new Intent(context, YourService.class);
context.startService(serviceIntent);
}
}
And for sure dont forget to add in AndroidManifest information about your Service and Receiver to be sure it will run automatically after reboot.
<service
android:name=".package.YourService"
android:enabled="true"
android:exported="false"> </service>
<receiver
android:name=".package.SimpleReceiver"
android:enabled="true"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
<action adroid:name="android.intent.action.QUICKBOOT_POWERON" />
</intent-filter>
</receiver>
Related
In my Android application, I am using One Signal push notification service to send push notifications. I have done all the settings according to document as mentioned.
After setting up all these things, I have created one service class of one signal like below-
NotificationExtenderBareBonesExample.java
public class NotificationExtenderBareBonesExample extends NotificationExtenderService {
public static String first_screen;
#Override
protected boolean onNotificationProcessing(OSNotificationReceivedResult receivedResult) {
SharedPreferences.Editor editor = getApplicationContext().getSharedPreferences("NOTIFY_PREF", MODE_PRIVATE).edit();
editor.putString("notify_msg", receivedResult.payload.groupMessage);
editor.putString("notify_key", receivedResult.payload.groupKey);
editor.apply();
first_screen = receivedResult.payload.groupMessage;
return false;
}
}
I have also created another class to handle the received push notification like below-
ExampleNotificationReceivedHandler.java
public class ExampleNotificationReceivedHandler implements OneSignal.NotificationReceivedHandler {
#Override
public void notificationReceived(OSNotification notification) {
JSONObject data = notification.payload.additionalData;
String customKey;
if (data != null) {
customKey = data.optString("customkey", null);
if (customKey != null)
Log.i("OneSignalExample", "customkey set with value: " + customKey);
}
}
}
Then, in my Activity class, I have initialized One Signal like below-
OneSignal.startInit(this)
.inFocusDisplaying(OneSignal.OSInFocusDisplayOption.Notification)
.unsubscribeWhenNotificationsAreDisabled(true)
.setNotificationReceivedHandler(new ExampleNotificationReceivedHandler())
.setNotificationOpenedHandler(new MyNotificationOpenedHandler(this))
.init();
At last in my AndroidManifest file, I have declared the service like below-
<service
android:name="com.rokomari.new_package.notification_check.NotificationExtenderBareBonesExample"
android:exported="false"
android:permission="android.permission.BIND_JOB_SERVICE">
<intent-filter>
<action android:name="com.onesignal.NotificationExtender" />
</intent-filter>
</service>
The push notification was coming, if the app is being used recently, but the problem was still there as it is mentioned in my question. So, I have checked few more solutions and applied in my project like below-
I made my application a system app and added one authentication service with that.
I also added one Broadcast-Receiver class like below-
BootReceiver.java
public class BootReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals("android.intent.action.BOOT_COMPLETED")) {
Intent startServiceIntent = new Intent(context, NotificationExtenderBareBonesExample.class);
context.startService(startServiceIntent);
Intent notificationServiceIntent = new Intent(context, NotificationExtenderBareBonesExample.class);
context.startService(notificationServiceIntent);
}
}
}
And declared this in my AndroidManifest file-
<receiver
android:name="com.rokomari.new_package.notification_check.BootReceiver"
android:enabled="true">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver>
After doing all these I am still having the same problem.
---- The Problem is -----
When I am using app(opening the app) regaularly the push notification from one signal is coming whether the app is in background or not. But when I am not using the app for a while it's not coming. In addition, for some devices mainly Xiomi the push notification is not coming at all.
After making some changes in Xiomi device like below-
*** Xiaomi - Make sure "Auto-start" property enabled for your app in the settings.**
After changing settings, the push notification came once. But I need a solution programmatically to send push notification to cover all the devices. If it is not possible yet with One Signal, then I like to know how apps like facebook, whatsapp send push notification?
I have a skeleton class of JobIntentService
public class BackgroundRequestService extends JobIntentService {
/**
* Unique job ID for this service.
*/
static final int JOB_ID = 1234;
public static void enqueueWork(Context context, Intent work) {
BackgroundRequestService.enqueueWork(context, BackgroundRequestService.class, JOB_ID, work);
}
#Override
protected void onHandleWork(#NonNull Intent intent) {
if (intent.getExtras() != null){
String x = ";";
}
}
}
I have included the Service in the manifest
<service android:name=".BackgroundRequestService"
android:enabled="true"
android:permission="android.permission.BIND_JOB_SERVICE"
android:exported="false" />
And calling the proper enqueue method
Intent intent = new Intent();
intent.putExtra("hardware", hardware);
BackgroundRequestService.enqueueWork(context, intent);
But the onHandleWork is never getting called. i have looked at all the pages about setting the services correctly and making sure onBind isn't overridden, but this still isn't working, wondering if another set of eyes would spot something ive missed. Thank you
Try to start service this way:
ComponentName comp = new ComponentName(context.getPackageName(), BackgroundRequestService.class.getName());
BackgroundRequestService.enqueueWork(context, (getIntent().setComponent(comp)));
Found the issue through some proper looking into the Logcat
Turns out the "hardware" that i was putting into my Intent was missing a field to be Serialized.
This caused this message to appear in the Logcat
I/UDP: no longer listening for UDP broadcasts cause of error Parcelable encountered IOException writing serializable object (name = Project.Hardware)
After fixing this Serialization issue i was able to call the onHandleWork() method.
I have a class in a service
MyClass m = new MyClass();
and inside my class I check if I have permission to overlay the view; if so, it's ok, otherwise I must start an activity
if (Settings.canDrawOverlays(mContext)) {
// draw over app
} else {
// start the activity
Intent i = new Intent(context,Calls.class);
context.startActivity(i);
}
When I start the activity I have a problem communicating between the class and the activity. I know how to use the interface but how can I register it in activity.
Some time I want to pass an object or data from the class to the activity or from the activity to the class... how can I do that?
I saw many examples in Stack Overflow about how to communicate between service and activity; they suggest to start the class from the activity but this does not work in my app because my class must be running all the time.
Perhaps you could use an event bus like mechanism where you can send or receive events through out your app, Though there are several libraries out there, I would recommend using Otto library for android.
Usage is pretty simple just register in your activity onCreate
Bus bus = new Bus();
bus.register(this);
For sending events
// example data to post
public class TestData {
public String message;
}
// post this data
bus.post(new TestData().message="Hello from the activity");
And subscribe to events like this
#Subscribe public void getMessage(TestData data) {
// TODO: React to the event somehow!
}
More info here
If you want to implement a communication pattern between a Service and an Activity, you should use a LocalBroadcastManager.
It will turn handy because, in case your Service is still on but your Activity
has been destroyed (very common situation), then the 'messagging' between the two will simply have no effect (no NPE or whatsoever will be thrown).
Step 1
Create a BroadcastReceiver in your Activity and define an ID / Filter
this.localBroadcastReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
// Do what you have to do here if you receive data from the Service / Background Task
}
}
public static final IntentFilter SIGNAL_FILTER = new IntentFilter("com.you.yourapp.MY_SIGNAL")
Step 2
In your Activity register the broadcast in onResume() and unregister it in onPause().
#Override
protected void onResume() {
// Listen if a Service send me some data
LocalBroadcastManager.getInstance(getApplicationContext()).registerReceiver(this.localBroadcastReceiver, SIGNAL_FILTER);
}
#Override
protected void onPause() {
// I'm going to the background / or being destroyed: no need to listen to anything anymore...
LocalBroadcastManager.getInstance(getApplicationContext()).unregisterReceiver(this.localBroadcastReceiver);
}
Your Activity is now ready to receive data from any other component in your Application.
If it's in the background, then there is no need to update the UI: in fact the Activity will not respond if in the background.
In the same way, if it's being garbage collected, the Receiver will be unregistered and the Activity will just not respond to anything.
If the Activity is resumed / restarted, onResume() will be triggered and the Receiver will be registered again.
Step 3
All you need to do right now, is send data from the Service.
Simply call
final Intent intent = new Intent();
intent.setAction(SomeActivity.SIGNAL_FILTER);
// put your data in intent
LocalBroadcastManager.getInstance(getApplicationContext()).sendBroadcast(intent);
and your Activity will accordingly respond to the signal.
It's surprising how few people know about the LocalBroadcastManager and instead use some self-implemented callback / singleton pattern, which increases complexity and non-readability.
This pattern is built-in in Android, so you don't need external libraries. As for security, this ensures that your signals stay internal to your application: no data can therefore be read by other apps.
I similarly answered to another question here.
Its simple Question
I am want to get the Amount of Time change By User using system setting
I am using Broadcast Receiver,from below broadcast Receiver , I only get the notice that time has changed
But how much Changed I don't no .
I want to get the whether the user incremented the time or decremented
And How much Incremented or Decremented ?
is it Possible to get this ?
if yes then how ?
Note : The IntentExtra didnt have any Extra information
<receiver android:name=".Receivers.TimeChangeReceivers">
<intent-filter >
<action android:name="android.intent.action.TIME_SET"></action>
</intent-filter>
</receiver>
My Class
public class TimeChangeReceivers extends BroadcastReceiver {
public static final String TAG= TimeChangeReceivers.class.getSimpleName ();
#Override
public void onReceive(Context context, Intent intent) {
Log.e ( TAG," Time Change!");
}
}
If there is any data that you can get, it will be stored in intent extras. Try to get intent.getExtras(), it will give you Bundle, and then you can get values from it.
When you get your Bundle try bundle.keySet() to get all keys from it, and look for needed info.
I've a Fragment fr, Service ser, BroadcastReceiver brc.
In fr I have a switch, when checked it launches ser, when un-checked it stops it, so far so good.
In ser, I have registered a BroadcastReceiver named brc and added an IntentFilter named USER_PRESENT, When the device is locked, I have the Service call stopSelf() and register that BroadcastReceiver, when the phone is unlocked, onReceive() will be called, in that method I've added a code to start the Service again .
Now, the problem .. I can't stop the Service when the switch is un-checked, even though I'm calling stopService(intentname); .
And my guess is, it's a different Intent which launched by a different class. So I've stopped that Intent like this:
stopService(brc.intentname);
Nothing happened and the Service keeps running. What's the solution for this?.
Code:
Fragment:
if ( !Switched ) {
getActivity().startService(ServiceIntent);
}
if( Switched ){
getActivity().stopService(ServiceIntent);
getActivity().stopService(BroadcastTest.ServiceIntent);
}
Service:
if( !isScreenOn && isLocked )
{
this.getApplicationContext().registerReceiver(new BroadcastTest(), new IntentFilter("android.intent.action.USER_PRESENT"));
CancelTimer();
stopSelf();
}
BroadcastTest:
ServiceIntent = new Intent(context, Service.class);
context.startService(ServiceIntent);