Develop Reference

Android Change a variable in service from other app

the title says all, I need to change the variable of my service from a activity in my other app , what to finalize the service or not, this is possible?
I found the Message object , but I do not quite understand

The simplest solution would be to implement a BroadcastReceiver. Your Service listens for the Broadcast and the other App sends the Broadcast.
Example Reciever:
public class MyReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
// Get bundle from intent and use it to set your Variable in your Service
}
}
Example Broadcaster (courtesy of Vogella):
Intent intent = new Intent();
intent.setAction("de.vogella.android.mybroadcast");
sendBroadcast(intent);

Pass SMS from BroadcastReceiver to Activity

I am creating an SMS app. I can send messages fine, however I cannot get it to receive. I have successfully implemented the functionality to allow the app to be selected as the default SMS application on the device.
The problem I have is that I cannot pass the SMS from the BroadcastReceiver to the Activity that displays messages. I am aware of the ability to use intent.putExtra() for the message and then startActivity(), but what happens if that activity has already been started when the message is received? I do not want to restart the activity every time a new message is received.

There are few ways to skin that cat, one way is to have a receiver inside the Activity something like this
void onResume(){
super.onResume();
IntentFilter filter = new IntentFilter();
filter.addAction("android.provider.Telephony.SMS_RECEIVED");
registerReceiver(mSmsReceiver, filter);
}
void onPause(){
super.onPause();
unregisterReceiver(mSmsReceiver);
}
private BroadcastReceiver mSmsReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
//Do you stufff
}
};

Android: how to send object from BroadcastReceiver to running Activity

I have a class that extends BroadcastReceiver that reads new sms
public class SmsReceiver extends BroadcastReceiver
{
// reading sms
// I want to send the sms text to my main activity
}
And have another class in the same app that is my main Activity.
So when I receive new sms, I want to send its content to my main Activity that is already running and display it.
How can I do that?
I would be thankful for some code samples :)

i can suggest you two possibilities
send new broadcasts from this receiver to a new receiver which is registered inside your activity
register this receiver inside your activity and reduce the hassle
i guess option two is more suitable
this is how you may register a broadcast receiver inside your activity class:
IntentFilter filter = new IntentFilter();
public void onResume(){
filter.addAction("action_string_1");
filter.addAction("action_string_2");
registerReceiver(receiver, filter);
}
public void onPause(){
unregisterReceiver(receiver);
}
BroadcastReceiver receiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if(action.equals("action_string_1")){
//do something here
}
else if(action.equals("action_string_2")){
//do somethign here
}
}
};

service displays points on map android

i have a android service running in the background which receives the coordinates from the server every few seconds. i am not sure how do i display the coordinates on a map every time the service receives a response from the server. kindly help or give an idea.
thanks

I don't know any tutorials on this, but here's a version of mine:
To send a broadcast, you use the 'sendBroadcast(Intent i)' method of the Context class. The Service class extends Context, so you can access it from your implementation.
So in your Service goes:
public static final String BROADCAST_ACTION="com.yourservice.update";
public void onStart( Intent intent, int startId ) {
...
Intent broadcastIntent = new Intent(BROADCAST_ACTION);
sendBroadcast(broadcastIntent);
...
}
You have to register a receiver for this broadcast in you Activity (possibly before you start boradcasting them), like this:
private BroadcastReceiver receiver=new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
//Here goes handling the stuff you got from the service
Bundle extras = intent.getExtras();
if(extras != null)processUIUpdate(extras);
}
};
public void onResume() {
...
//Register for the update broadcasts from the torrent service
registerReceiver(receiver, new IntentFilter(YourService.BROADCAST_ACTION));
...
}
Don't forget to deregister when the Activity goes background:
public void onPause() {
...
//Deregister for the update broadcast from the torrent service
unregisterReceiver(receiver);
...
}
This should work.

Your service could broadcast intents whenever it wants to update the displayed location on the map. The Activity displaying the map should register a receiver for that boradcast, and the boradcast's intent can hold the values for lat. and long.

Android - Sending data from an activity to a service

I've a local service that is started in my main activity. The service is responsible for network I/O. It also interacts with other activities in my application. Till, now the service was only "providing" data to activity (using callbacks and not Intents.)
Now I need to send data (custom objects) from my activities to the service. I understand one way to do it using Intents. I know it is possible to receive an Intent in the service by overriding the onStartCommand() in my service. But it's not clear to me if the onStartCommand will be invoked every time I broadcast an Intent from my sending activity. Can a Service also be BroadcastReceiver ? If yes - how ?
Thanks.

You can create a BroadcastReceiver object in the service and register it to listen to any broadcast event you want. It's something like this:
BroadcastReceiver mScreenStateReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
//handle the broadcast event here
}
};
#Override
public void onCreate() {
super.onCreate();
IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_OFF);
filter.addAction(Intent.ACTION_SCREEN_ON);
registerReceiver(mScreenStateReceiver, filter);
}
#Override
public void onDestroy() {
super.onDestroy();
unregisterReceiver(mScreenStateReceiver);
}
Regards,