Re: [android-beginners] Using Methods in a Service from an Activity
Ok, I've found the problem, for anyone else having trouble. In the tutorial, onBind() returns null, I created a MediaBinder class within MediaService, that implemented my MediaInterface, calling the relevant methods in MediaService. This works nicely. On 19/04/2010 21:43, Mark Murphy wrote: Tom F M White wrote: I'm calling start a relatively long time later, several seconds. Do I need to call onServiceConnected() myself? No, it should be called shortly after you call bindService(). This suggests that your bindService() call is failing for some reason (e.g., your service is not registered in your manifest). Here is a sample project from one of my books showing the use of bindService(): http://github.com/commonsguy/cw-android/tree/master/Service/WeatherPlus/ -- You received this message because you are subscribed to the Google Groups Android Beginners group. NEW! Try asking and tagging your question on Stack Overflow at http://stackoverflow.com/questions/tagged/android To unsubscribe from this group, send email to android-beginners+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-beginners?hl=en
[android-beginners] Using Methods in a Service from an Activity
Further to my previous email, I have sketched out how my Media Player
will work with the actual MediaPlayer object in a separate service,
MediaService. I can't work out how to make calls, and retrieve data from
the service. Following tutorials online has lead me to this:
MyApp.java - top level Activity, in onCreate():
...
MediaConnection conn = new MediaConnection();
StateApp state = (StateApp) getApplicationContext();
bindService( new Intent(this,MediaService.class), conn,
Context.BIND_AUTO_CREATE);
state.setMediaConnection(conn);
...
MediaView.java - View for playing media files, in play button onClick():
...
StateApp state = (StateApp) context.getApplicationContext();
MediaConnection conn = state.getMediaConnection();
conn.start(mediaLocation);
...
MediaConnection implements ServiceConnection:
public class MediaConnection implements ServiceConnection, MediaInterface{
private Binder service;
public void start(String loc){
MediaInterface i = (MediaInterface)service;
i.start(loc);
}
public void onServiceDisconnected(ComponentName cn){
Log.i(INFO, Service unbound );
}
public void onServiceConnected(ComponentName cn, IBinder b){
service = (Binder)b;
Log.i(INFO, Service bound );
}
}
Which throws a NullPointerException at i.start(loc). Can anyone tell me
what I'm doing wrong?
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Re: [android-beginners] Using Methods in a Service from an Activity
Tom F M White wrote:
Further to my previous email, I have sketched out how my Media Player
will work with the actual MediaPlayer object in a separate service,
MediaService. I can't work out how to make calls, and retrieve data from
the service. Following tutorials online has lead me to this:
MyApp.java - top level Activity, in onCreate():
...
MediaConnection conn = new MediaConnection();
StateApp state = (StateApp) getApplicationContext();
bindService( new Intent(this,MediaService.class), conn,
Context.BIND_AUTO_CREATE);
state.setMediaConnection(conn);
...
MediaView.java - View for playing media files, in play button onClick():
...
StateApp state = (StateApp) context.getApplicationContext();
MediaConnection conn = state.getMediaConnection();
conn.start(mediaLocation);
...
MediaConnection implements ServiceConnection:
public class MediaConnection implements ServiceConnection, MediaInterface{
private Binder service;
public void start(String loc){
MediaInterface i = (MediaInterface)service;
i.start(loc);
}
public void onServiceDisconnected(ComponentName cn){
Log.i(INFO, Service unbound );
}
public void onServiceConnected(ComponentName cn, IBinder b){
service = (Binder)b;
Log.i(INFO, Service bound );
}
}
Which throws a NullPointerException at i.start(loc). Can anyone tell me
what I'm doing wrong?
Off the cuff, I would guess that you are calling start() before Android
calls onServiceConnected().
--
Mark Murphy (a Commons Guy)
http://commonsware.com | http://twitter.com/commonsguy
Android Development Wiki: http://wiki.andmob.org
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Re: [android-beginners] Using Methods in a Service from an Activity
On 19/04/2010 21:36, Mark Murphy wrote:
Tom F M White wrote:
Further to my previous email, I have sketched out how my Media Player
will work with the actual MediaPlayer object in a separate service,
MediaService. I can't work out how to make calls, and retrieve data from
the service. Following tutorials online has lead me to this:
MyApp.java - top level Activity, in onCreate():
...
MediaConnection conn = new MediaConnection();
StateApp state = (StateApp) getApplicationContext();
bindService( new Intent(this,MediaService.class), conn,
Context.BIND_AUTO_CREATE);
state.setMediaConnection(conn);
...
MediaView.java - View for playing media files, in play button onClick():
...
StateApp state = (StateApp) context.getApplicationContext();
MediaConnection conn = state.getMediaConnection();
conn.start(mediaLocation);
...
MediaConnection implements ServiceConnection:
public class MediaConnection implements ServiceConnection, MediaInterface{
private Binder service;
public void start(String loc){
MediaInterface i = (MediaInterface)service;
i.start(loc);
}
public void onServiceDisconnected(ComponentName cn){
Log.i(INFO, Service unbound );
}
public void onServiceConnected(ComponentName cn, IBinder b){
service = (Binder)b;
Log.i(INFO, Service bound );
}
}
Which throws a NullPointerException at i.start(loc). Can anyone tell me
what I'm doing wrong?
Off the cuff, I would guess that you are calling start() before Android
calls onServiceConnected().
I'm calling start a relatively long time later, several seconds. Do I
need to call onServiceConnected() myself?
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Re: [android-beginners] Using Methods in a Service from an Activity
On 19/04/2010 21:43, Mark Murphy wrote: Tom F M White wrote: I'm calling start a relatively long time later, several seconds. Do I need to call onServiceConnected() myself? No, it should be called shortly after you call bindService(). This suggests that your bindService() call is failing for some reason (e.g., your service is not registered in your manifest). Here is a sample project from one of my books showing the use of bindService(): http://github.com/commonsguy/cw-android/tree/master/Service/WeatherPlus/ Some strange behaviour, the service is being started ok, and bindService() is returning true, yet onServiceConnected() never seems to be called, and I can't seem to find a reason. -- You received this message because you are subscribed to the Google Groups Android Beginners group. NEW! Try asking and tagging your question on Stack Overflow at http://stackoverflow.com/questions/tagged/android To unsubscribe from this group, send email to android-beginners+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-beginners?hl=en
