We Keep Coding

How to detect application runs foreground or background using Single Activity or Java class

I want to sent report to the server which means how long user Use the application in single day..I can achieve using this to method
#Override
protected void onResume() {
super.onResume();
//commonclassMethod.getInstance(UserForground);
}
#Override
protected void onStop() {
super.onStop();
//commonclassMethod.getInstance(UserBackground);
}
What happen i need to call call this method in every activity....
What i need,is there any possible to find user forground background method in single java class or activity..
Thanks in Advance.

You can can achieve this just by adding an method isAppIsInBackground(Context context) in class which is extending Application class
In that class define that method:
public static boolean isAppIsInBackground(Context context) {
boolean isInBackground = true;
ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
if (Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT_WATCH) {
List<ActivityManager.RunningAppProcessInfo> runningProcesses = am.getRunningAppProcesses();
for (ActivityManager.RunningAppProcessInfo processInfo : runningProcesses) {
if (processInfo.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {
for (String activeProcess : processInfo.pkgList) {
if (activeProcess.equals(context.getPackageName())) {
isInBackground = false;
}
}
}
}
} else {
List<ActivityManager.RunningTaskInfo> taskInfo = am.getRunningTasks(1);
ComponentName componentInfo = taskInfo.get(0).topActivity;
if (componentInfo.getPackageName().equals(context.getPackageName())) {
isInBackground = false;
}
}
return isInBackground;
}
It will true if app is in background
Or another better approach would be just extend your each Activity by an BaseActivity, in this BaseActivity's override methods
protected void onResume() {
super.onResume();
//commonclassMethod.getInstance(UserForground);
}
protected void onStop() {
super.onStop();
//commonclassMethod.getInstance(UserBackground);
}

You can implement callback method to solve your case.
For example:
You create an interface first, then define a method, which would act as a callback. In this example we would have two classes, one classA and another classB
Interface:
public interface OnCustomEventListener{
public void onEvent(); //method, which can have parameters
}
the listener itself in classB (we only set the listener in classB)
private OnCustomEventListener mListener; //listener field
//setting the listener
public void setCustomEventListener(OnCustomEventListener eventListener) {
this.mListener=eventListener;
}
in classA, how we start listening for whatever classB has to tell
classB.setCustomEventListener(new OnCustomEventListener(){
public void onEvent(){
//do whatever you want to do when the event is performed.
}
});
how do we trigger an event from classB (for example on button pressed)
if(this.mListener!=null){
this.mListener.onEvent();
}
Here is some nice tutorials link1,link2,link3 which describes callbacks and the use-case well.

Create a class extending application and use registerActivityLifecycleCallbacks() to get the activity lifecycle
public class MyApp extends Application {
#Override
public void onCreate() {
super.onCreate();
registerActivityLifecycleCallbacks(new ActivityLifecycleCallbacks() {
#Override
public void onActivityCreated(Activity activity, Bundle bundle) {
}
#Override
public void onActivityStarted(Activity activity) {
}
#Override
public void onActivityResumed(Activity activity) {
}
#Override
public void onActivityPaused(Activity activity) {
if(activity.getClass().getSimpleName().equalsIgnoreCase(MainActivity.class.getSimpleName())){
//Do the required thing here
}
}
#Override
public void onActivityStopped(Activity activity) {
}
#Override
public void onActivitySaveInstanceState(Activity activity, Bundle bundle) {
}
#Override
public void onActivityDestroyed(Activity activity) {
}
});
}
}
Also dont forget to register activity in manifest
<application
android:name=".MyApp"

You have two options.
1) Do a abstract BaseActivity and make all Activities extend it. This way you only write the code in one BaseActivity and all children activities consume it.
2) Use a custom counter class to monitor app to foreground. Here is my implementation of it if you would like to copy it.
/**
* Created by App Studio 35 on 6/23/17.
*/
public class AppLifeCycleTracker implements Application.ActivityLifecycleCallbacks {;
/*///////////////////////////////////////////////////////////////
// METHODS
*////////////////////////////////////////////////////////////////
private static final String TAG = Globals.SEARCH_STRING + AppLifeCycleTracker.class.getSimpleName();
private static AppLifeCycleTracker INSTANCE;
private static int numActivitiesInMemory = 0;
private ArrayList<IAppToForegroundListener> mAppToForegroundListeners;
private boolean isRefreshing;
private Object lockAccess = new Object();
private AlertDialog mAlertDialog = null;
/*///////////////////////////////////////////////////////////////
// PROPERTIES
*////////////////////////////////////////////////////////////////
private ArrayList<IAppToForegroundListener> getAppToForegroundListeners(){
return mAppToForegroundListeners == null ? mAppToForegroundListeners = new ArrayList<IAppToForegroundListener>() : mAppToForegroundListeners;
}
public boolean getIsRefreshing(){
return isRefreshing;
}
public boolean getAppIsInBackground(){
return numActivitiesInMemory < 1;
}
/*///////////////////////////////////////////////////////////////
// CONSTRUCTOR
*////////////////////////////////////////////////////////////////
private AppLifeCycleTracker(){
}
public synchronized static AppLifeCycleTracker getInstance(){
if(INSTANCE == null){
INSTANCE = new AppLifeCycleTracker();
}
return INSTANCE;
}
/*///////////////////////////////////////////////////////////////
// LIFE CYCLE OVERRIDES
*////////////////////////////////////////////////////////////////
#Override
public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
}
#Override
public void onActivityStarted(final Activity activity) {
//App went into background, so set a flag to avoid loading while we refresh
if(numActivitiesInMemory == 0 && !(activity instanceof SplashScreenActivity) && !(activity instanceof CreateAccountActivity)){
A35Log.v(TAG, "App Returned to Foreground, refreshing Token");
//first load on splash it goes from 0 to 1 so hold off on splash
synchronized (lockAccess) {
isRefreshing = true;
}
if (DeviceInfo.getInstance(activity).getIsConnectedToInternet()) {
CognitoManager.refreshToken(activity, new GenericHandler() {
#Override
public void onSuccess() {
A35Log.v(TAG, "Token Refresh Complete, notifying listeners");
//we are good, keep going
for(IAppToForegroundListener listener : getAppToForegroundListeners()){
listener.onRefreshTokenComplete();
}
synchronized (lockAccess) {
isRefreshing = false;
}
}
#Override
public void onFailure(Exception exception) {
//boot them to login screen
if(activity instanceof LoginActivity || activity instanceof SplashScreenActivity){
return;
}
startLoginActivity(activity);
synchronized (lockAccess) {
isRefreshing = false;
}
}
});
} else {
showInternetRequiredDialog(activity);
}
}
numActivitiesInMemory++;
}
#Override
public void onActivityResumed(Activity activity) {
}
#Override
public void onActivityPaused(Activity activity) {
}
#Override
public void onActivityStopped(Activity activity) {
numActivitiesInMemory--;
//if numActivities == 0 then you are in the background
}
#Override
public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
}
#Override
public void onActivityDestroyed(Activity activity) {
}
/*///////////////////////////////////////////////////////////////
// METHODS
*////////////////////////////////////////////////////////////////
public void addAppToForegroundListener(IAppToForegroundListener listener){
getAppToForegroundListeners().add(listener);
}
public void removeAppToForegroundListener(IAppToForegroundListener listener){
getAppToForegroundListeners().remove(listener);
}
private void startLoginActivity(final Activity activity){
((AMApplication) activity.getApplication()).logoutCurrentUser(activity, false, false, null, true, null);
}
/*///////////////////////////////////////////////////////////////
// INTERFACES
*////////////////////////////////////////////////////////////////
public interface IAppToForegroundListener {
/*///////////////////////////////////////////////////////////////
// METHODS
*////////////////////////////////////////////////////////////////
void onRefreshTokenComplete();
}
private void showInternetRequiredDialog(Activity activity){
final AlertDialog.Builder builder = new AlertDialog.Builder(activity);
builder.setTitle("Error").setMessage("Internet is required to use this app").setNegativeButton(R.string.ok, new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
if(mAlertDialog != null && mAlertDialog.isShowing()) {
mAlertDialog.dismiss();
}
}
});
mAlertDialog = builder.create();
mAlertDialog.show();
}
}
Of course this does a little more then you are looking for as mine manages refreshing the token with cognito and forcing refresh on returning from background and things like that, so just disregard that piece. But the rest is all the same still. Hope that helps.
I'm assuming you don't need an example of a BaseActivity so I won't patronize you by pasting that.
Startup in Application class
#Override
public void onCreate() {
super.onCreate();
registerActivityLifecycleCallbacks(AppLifeCycleTracker.getInstance());
}
Then you ONLY need to access from BaseActivity or BaseFragment IF you need to be notified when the app is in foreground or background at an Activity or fragment level. Which for your situation is not the case.
But if you ever wanted to use it, simply do this:
#Override
public void onAttach(Context context) {
super.onAttach(context);
AppLifeCycleTracker.getInstance().addAppToForegroundListener(this);
}
#Override
public void onDetach() {
super.onDetach();
AppLifeCycleTracker.getInstance().removeAppToForegroundListener(this);
}
But again, I must emphasize, this part is ONLY if you care to make your activity or fragment be aware of when the app comes back to foreground to force refresh or other behaviors. Replace onDetach with onDestroy if using Activity, but for your scenario you can skip that whole last section of code, you don't need it.

How to make a background service?

I need to execute some tasks when my application is closed.
I have made a service for do this and tried many things, but i don't have the good result.
If someone have a tutorial or some path to follow, it would be great
This is my service:
public class TrackersImporter extends Service {
private static TrackersImporter instance;
private static long refreshDelay = 1; // Minutes
private Looper mServiceLooper;
private ServiceHandler mServiceHandler;
private boolean isInit = false;
public ArrayList<Tracker> trackers = new ArrayList<>();
public static TrackersImporter getInstance(){
if (instance == null)
instance = new TrackersImporter();
return instance;
}
#Override
public void onCreate() {
HandlerThread thread = new HandlerThread("TrackersImporter",
Process.THREAD_PRIORITY_BACKGROUND);
thread.start();
mServiceLooper = thread.getLooper();
mServiceHandler = new ServiceHandler(mServiceLooper);
}
#Override
public IBinder onBind(Intent intent) {
return null;
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
try {
Toast.makeText(this, "onStartCommand", Toast.LENGTH_SHORT).show();
Message message = mServiceHandler.obtainMessage();
message.arg1 = startId;
mServiceHandler.sendMessage(message);
} catch (Exception e) {
Log.w("TrackersImporter", e.getMessage());
}
return START_STICKY;
}
public void addTracker(Tracker tracker) {
trackers.add(tracker);
}
protected void showToast(final String msg){
Handler handler = new Handler(Looper.getMainLooper());
handler.post(new Runnable() {
#Override
public void run() {
Toast.makeText(getApplicationContext(), msg, Toast.LENGTH_SHORT).show();
}
});
}
// Object responsible for
private final class ServiceHandler extends Handler {
public ServiceHandler(Looper looper) {
super(looper);
}
#Override
public void handleMessage(Message msg) {
addTracker(Runkeeper.getInstance(MainActivity.getActivity()));
addTracker(Strava.getInstance(MainActivity.getActivity()));
startImport(MainActivity.getActivity().getBaseContext(), MainActivity.getActivity().getAppUser(), trackers);
stopSelf(msg.arg1);
}
/**
* Perform data imports.
* Imports are performed only 1 time.
* Additional calls to this method are equivalent to no-op.
* Call init() then performImport() for each TrackerImportable
* #param user user receiving the datas
*/
public void startImport(Context context, User user, ArrayList<Tracker> trackers) {
Context ctx = MainActivity.getActivity().getApplicationContext();
LocalDateTime now = new LocalDateTime();
if (Preferences.getPref(ctx, "tracker_import_date") == "")
Preferences.setPref(ctx, "tracker_import_date", now.toString());
LocalDateTime past = LocalDateTime.parse(Preferences.getPref(ctx, "tracker_import_date"));
long duration = new Duration(past.toDateTime(), now.toDateTime()).getStandardMinutes();
if (isInit)
return;
if (duration > refreshDelay) {
Preferences.setPref(ctx, "tracker_import_date", now.toString());
for (Tracker tracker : trackers) {
if (tracker.isEnabled() && Tracker.isUserEnabled(context, tracker.getName())) {
tracker.init();
tracker.performImport(user);
}
}
}
isInit = true;
}
}
}
This is my mainActivity
public class MainActivity extends BaseActivity {
...
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
...
if (ConnectivityUtil.isConnected(this.getApplicationContext())) {
initGoogleFit();
initTrackers(appUser);
}
}
private void initTrackers(User user) {
Intent trackersIntentService = new Intent(this, TrackersImporter.class);
trackersIntentService.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
this.startService(trackersIntentService);
}
#Override
protected void onResume() {
...
if (ConnectivityUtil.isConnected(this.getApplicationContext())) {
initTrackers(appUser);
}
}
}

First Create one launcher Activity which is like your Main Activity.
In Activity "onCreate" Method you need to start Service and Do Some thing if you wont in Service "onStartCommand" Method.
public class MainActivity extends Activity {
ArrayList<Integer> list;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
startService(new Intent(MainActivity.this,TrackersImporter.class);
}
public class TrackersImporter extends Service {
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
// do something
Log.v(TAG ,"Service is started");
}
}
And also Register this Service at manifest.xml like this.
<service android:name=".TrackersImporter"></service>
if you like stop service
stopService(new Intent(MainActivity.this,TrackersImporter.class);

Communication between Activity and GCMListenerService Android

I am working on an android application with push notification feature using GCM. I have created a class called PushNotificationService which extends GCMListenerService. Inside the onMessageReceived(String from, Bundle data) I am able to get the message in the push notification.
Now, I want to access a method inside my MainActivity class whenever a particular message is received in the push.
Below is my code :-
PushNotificationService.java
public class PushNotificationService extends GcmListenerService {
#Override
public void onMessageReceived(String from, Bundle data) {
// TODO Auto-generated method stub
super.onMessageReceived(from, data);
String message = data.getString("message");
if(message.equalsIgnoreCase("Begin Task"))
{
//call method from MainActivity.class
}
}
}
MainActivty.java
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void beginTask()
{
Log.d("GCM","Message Received from Server");
finish();
}
}
I want the beginTask() method to execute whenever the message "Begin Task" is received.
I know one approach is via Service->Interface->Activity architecture but I am not able to use this as I never create an object of PushNotificationService.
Please help.
UPDATE :-
I am now using Otto Library and below is my code.
Added new MyBus.java
public class MyBus extends Bus {
private static Bus bus;
//isRegistered is used to track the current registration status
private static boolean isRegistered;
private Handler handler = new Handler(Looper.getMainLooper());
public MyBus() {
if (bus == null) {
//ANY will allow event bus to run even with services
//and broadcast receivers
bus = new Bus(ThreadEnforcer.ANY);
}
}
#Override
public void register(Object obj) {
//The bus is registered when an activity starts
bus.register(obj);
isRegistered = true;
}
#Override
public void unregister(Object obj) {
//The bus is unregistered when an activity goes to background
bus.unregister(obj);
isRegistered = false;
}
#Override
public void post(final Object event) {
if (Looper.myLooper() == Looper.getMainLooper()) {
//post the event in main thread or background thread
bus.post(event);
} else {
handler.post(new Runnable() {
#Override
public void run() {
bus.post(event);
}
});
}
}
public boolean isRegistered(){
return isRegistered;
}
}
PushNotificationService.java
public class PushNotificationService extends GcmListenerService {
#Override
public void onMessageReceived(String from, Bundle data) {
// TODO Auto-generated method stub
super.onMessageReceived(from, data);
MyBus myBus = new MyBus();
myBus.register(myBus);
String message = data.getString("message");
if(message.equalsIgnoreCase("Begin Task"))
{
myBus.post(message);
}
}
}
MainActivity.java
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Subscribe
public void beginTask()
{
Log.d("GCM","Message Received from Server");
}
}
The problem is still not solved. The beginTask() inside MainActivity.java is still not getting called.

Use eventBus libraries to facilitate this process...
I use Otto for this process
http://square.github.io/otto/
Here is an another eventBus library https://greenrobot.github.io/EventBus/
Steps:
1.Create an event from the service
2.Add a listener in the activity
3.If the activity is running the method will be executed
**EDIT 1 : **
I have abstracted the otto bus like this.
package com.mypackage.eventBus;
import android.os.Handler;
import android.os.Looper;
import com.squareup.otto.Bus;
import com.squareup.otto.ThreadEnforcer;
/**
* Created by gowtham on 10/6/15.
*/
public class MyBus extends Bus {
private static Bus bus;
//isRegistered is used to track the current registration status
private static boolean isRegistered;
private Handler handler = new Handler(Looper.getMainLooper());
public MyBus() {
if (bus == null) {
//ANY will allow event bus to run even with services
//and broadcast receivers
bus = new Bus(ThreadEnforcer.ANY);
}
}
#Override
public void register(Object obj) {
//The bus is registered when an activity starts
bus.register(obj);
isRegistered = true;
}
#Override
public void unregister(Object obj) {
//The bus is unregistered when an activity goes to background
bus.unregister(obj);
isRegistered = false;
}
#Override
public void post(final Object event) {
if (Looper.myLooper() == Looper.getMainLooper()) {
//post the event in main thread or background thread
bus.post(event);
} else {
handler.post(new Runnable() {
#Override
public void run() {
bus.post(event);
}
});
}
}
public boolean isRegistered(){
return isRegistered;
}
}
create an instance of the above object and try posting event
EDIT 2 for Jcarlo's comment
Follow these steps to find the state of the activity.
In your activity's onResume call MyBus.getInstance().register(this).
In your activity's onPause call MyBus.getInstance().unregister(this).
In your GCM IntentService before posting the message
if(MyBus.getInstance().isRegistered()){
//app is alive
//post data
}else{
//show notification
}
Hope this helps

You can use LocalBroadcastManager. Create a LocalBroadcastManager object mBroadcaster = LocalBroadcastManager.getInstance(this); on onCreate of your GCMListener and send broadcast with
#Override
public void onCreate() {
super.onCreate();
mBroadcaster = LocalBroadcastManager.getInstance(this);
}
#Override
public void onMessageReceived(String from, Bundle data) {
super.onMessageReceived(from, data);
String message = data.getString("message");
if(message.equalsIgnoreCase("Begin Task")) {
Intent i = new Intent();
i.setAction("yourPackageName");
i.putExtra("DATA", yourData);
mBroadcaster.send(i);
}
}
Then you can receive message in MainActivity using a BroadcastReceiver.
BroadCastReceiver mBroadcastReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
beginTask();
}
};
Also you need to register and unregister the receiver in onStart and onStop of your activity
#Override
protected void onStart() {
super.onStart();
IntentFilter filter = new IntentFilter();
filter.addAction("yourPackageName);
LocalBroadcastManager.getInstance(this).registerReceiver((mBroadcastReceiver), filter);
}
#Override
protected void onStop() {
super.onStop();
LocalBroadcastManager.getInstance(this).unregisterReceiver(mBroadcastReceiver);
}

Android Callback Error

I want to make a callback function in the ShipInfoManager to inform the MainActivity to do some action.
If I put onEvent() into Runnable, it runs.
However If I put it like this, it shows an error.
Is there any way to fire the callback after loading data?
Or, is there any way to do the callback like Android's API's LocatioManger's requestLocationUpdates, giving a callback when the data/variables is changed?
Thank you for any replies!
MyCallback Interface:
interface MyCallback {
void callbackCall();
}
ShipInfoManager class:
public class ShipInfoManager {
Context mContext;
public ShipInfoManager(Context _mContext) {
this.mContext = _mContext;
reloadData();
startTimer();
}
MyCallback callback;
void onEvent() {
callback.callbackCall();
}
private void startTimer() {
/* RUN EVERY MIN */
final Handler handler = new Handler();
Timer timer = new Timer();
TimerTask doAsynchronousTask = new TimerTask() {
#Override
public void run() {
handler.post(new Runnable() {
#SuppressWarnings("unchecked")
public void run() {
try {
reloadData();
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
};
// TEMP SUSPEND FROM PREVENTING RELOAD //
timer.schedule(doAsynchronousTask, 0, 5000);
}
/* JSON handling and extraction */
private void reloadData() {
//Do sth to reload the data
//After reload, I want to fire the callback
onEvent();
}
}

It looks like you haven't any listeners to your callback and you're not checking for this.
You should replace your ShipInfoManager with this:
public class ShipInfoManager {
public interface MyCallback {
void callbackCall();
}
public void setCustomEventListener(MyCallback eventListener) {
callback = eventListener;
}
Context mContext;
public ShipInfoManager(Context _mContext) {
this.mContext = _mContext;
reloadData();
startTimer();
}
MyCallback callback;
void onEvent() {
// Check if we have listeners
if (callback != null)
callback.callbackCall();
}
private void startTimer() {
/* RUN EVERY MIN */
final Handler handler = new Handler();
Timer timer = new Timer();
TimerTask doAsynchronousTask = new TimerTask() {
#Override
public void run() {
handler.post(new Runnable() {
#SuppressWarnings("unchecked")
public void run() {
try {
reloadData();
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
};
// TEMP SUSPEND FROM PREVENTING RELOAD //
timer.schedule(doAsynchronousTask, 0, 5000);
}
/* JSON handling and extraction */
private void reloadData() {
//Do sth to reload the data
//After reload, I want to fire the callback
onEvent();
}
}
Inside your Activity or Fragment you should have something like:
public class MainActivity extends ActionBarActivity implements ShipInfoManager.MyCallback {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ShipInfoManager s = new ShipInfoManager(this);
s.setCustomEventListener(this);
}
#Override
public void callbackCall() {
}
}

I changed my MainActivity like this. It works now.
Thank you for your suggestion and reply!!!!!
public class MainActivity extends ActionBarActivity {
ShipInfoManager mShipInfo;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mShipInfo = new ShipInfoManager(this);
Log.i("Show Ship List Size", String.valueOf(mShipInfo.get_shipsList().size()));
Log.i("Show Ship - 6", String.valueOf(mShipInfo.getShip(6).getShip_name()));
mShipInfo.callback = new ShipInfoManager.MyCallback() {
#Override
public void callbackCall() {
Log.i("Call Back", "it is called");
}
};
}

Notify Activity Class

I have 2 classes which are GcmMessageHandler and Control (its an activity class, shows some graphics). When i handle the gcm message, i want to refresh control class (but if its front)
public class GcmMessageHandler extends IntentService {
String mes;
private Handler handler;
public GcmMessageHandler() {
super("GcmMessageHandler");
}
#Override
public void onCreate() {
// TODO Auto-generated method stub
super.onCreate();
handler = new Handler();
}
#Override
protected void onHandleIntent(Intent intent) {
Bundle extras = intent.getExtras();
GoogleCloudMessaging gcm = GoogleCloudMessaging.getInstance(this);
// The getMessageType() intent parameter must be the intent you received
// in your BroadcastReceiver.
String messageType = gcm.getMessageType(intent);
mes = extras.getString("title");
showToast();
Log.i("GCM", "Received : (" +messageType+") "+extras.getString("title"));
GcmBroadcastReceiver.completeWakefulIntent(intent);
}
public void showToast(){
handler.post(new Runnable() {
public void run() {
if(mes.equals("Control")){
}else{
Toast.makeText(getApplicationContext(),mes , Toast.LENGTH_LONG).show();
}
}
});
}
}
In this part:
if(mes.equals("Control")){ }
if the control activity class is resume, i want to refresh it. How can i do this?

You can use a BroadcastReceiver in order to notify your activity about any changes. So register a BroadcastReceiver in your activity first:
public class MainActivity extends Activity {
public static String REFRESH_ACTIVITY = "com.domain.action.REFRESH_UI"
private BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
// do UI updates
}
};
#Override
public void onResume() {
super.onResume();
// do UI updates
IntentFilter filter = new IntentFilter();
filter.addAction(REFRESH_ACTIVITY);
this.registerReceiver(broadcastReceiver, filter);
}
#Override
public void onPause() {
super.onPause();
this.unregisterReceiver(broadcastReceiver);
}
...
}
Then send the broadcast to perform the UI update from any location:
if (mes.equals("Control")) {
Intent intent = new Intent();
intent.setAction(MainActivity.REFRESH_ACTIVITY);
sendBroadcast(intent);
}

Maybe you could use an observer design pattern.
Let the GcmMessageHandler hold the Control activity as an observer and then notify it when needed.
public class GcmMessageHandler extends IntentService {
String mes;
private Handler handler;
private Control mObserver
public GcmMessageHandler() {
super("GcmMessageHandler");
}
public void attachObserver(Control ctrl) {
mObserver = ctrl;
}
Then you just add a method to the Control class that can be called from the GcmMessageHandler class.
if(mes.equals("Control")){
mObserver.update(); // example
}else ...
It would be more slick if you first defined an observer interface:
public interface IObserver {
public abstract void update();
}
and had your Control class implement that. This way your GcmMessageHandler class could have a list of observers:
public class GcmMessageHandler extends IntentService {
String mes;
private Handler handler;
private List<IObserver> mObservers;
public GcmMessageHandler() {
super("GcmMessageHandler");
}
#Override
public void onCreate() {
// TODO Auto-generated method stub
super.onCreate();
handler = new Handler();
mObservers = new ArrayList<IObserver>();
}
public void attachObserver(Control ctrl) {
mObservers.add(ctrl);
}
private void notify() {
for(IObserver observer : mObservers)
observer.update();
}
And of course if the Control class is the one holding the GcmMessageHandler object your just call the attach method from Control like this:
myGcmMessageHandler.attachObserver(this);