Develop Reference

onCreate doesn't run in a service

I'm writing this service but I can't see the log strings when I launch the app.
if I put a Log.i in the method startBeaconDetecting I can see it but after the onCreate() method doesn't start.
Why onCreate doesn't run?
public class ProximityBeacon extends Service
{
private String server;
private String ID;
public ProximityBeacon(String server)
{
this.server=server;
//TODO indirizzo del server
}
public void startBeaconDetecting(String ID, Intent intent, Context context)
{
this.ID=ID;
context.startService(intent);
}
public void stopBeaconDetecting()
{
stopSelf();
onDestroy();
}
public void onCreate()
{
super.onCreate();
Log.i(TAG, "Oncreate");
}
public int onStartCommand(Intent intent, int flag, int startId)
{
Log.i(TAG, "onStartCommand");
return Service.START_STICKY;
}
}

Change your Service class to this:
public class ProximityBeacon extends Service
{
private static final String TAG = "TAG";
private String server;
private String ID;
public ProximityBeacon() {
}
public ProximityBeacon(String server)
{
this.server=server;
//TODO indirizzo del server
}
public void startBeaconDetecting(String ID, Intent intent, Context context)
{
this.ID=ID;
context.startService(intent);
}
public void stopBeaconDetecting()
{
stopSelf();
onDestroy();
}
public void onCreate()
{
super.onCreate();
Log.i(TAG, "ProximityBeacon Oncreate");
}
public int onStartCommand(Intent intent, int flag, int startId)
{
Log.i(TAG, "ProximityBeaconon StartCommand");
return Service.START_STICKY;
}
#Nullable
#Override
public IBinder onBind(Intent intent) {
return null;
}
}
and then call it using this:
new ProximityBeacon("").startBeaconDetecting("" ,new Intent(HomeActivity.this, ProximityBeacon.class) ,mContext) ;
then add it in manifest.xml like this :
<service android:name=".services.ProximityBeacon" />
Output : 19:25:11.873 23002-23002/com.sample.service I/TAG: ProximityBeaconon StartCommand

after startService(service); will run onStartCommand, not onCreate

Running countdown timer faster when i back to activity

I make a service for countdown timer, in activity i put a text view for show time every seconds: 100 - 0, but when i leave activity and back to that. i see timer as run very fast, but i want to this run just every second. where is problem ?
MainActivity:
public static final String mBroadcastIntegerAction = "com.example.broadcast.integer";
private IntentFilter mIntentFilter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
showTime = (TextView) findViewById(R.id.textView1);
mIntentFilter = new IntentFilter();
mIntentFilter.addAction(mBroadcastIntegerAction);
Intent serviceIntent = new Intent(this, AppServiceDay.class);
startService(serviceIntent);
}
#Override
public void onResume() {
super.onResume();
registerReceiver(mReceiver, mIntentFilter);
}
private BroadcastReceiver mReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(mBroadcastIntegerAction)) {
int second = intent.getIntExtra("Time", 0);
showTime.setText("" + second);
}
}
};
#Override
protected void onPause() {
registerReceiver(mReceiver, mIntentFilter);
// unregisterReceiver(mReceiver);
super.onPause();
}
Service:
public class AppServiceDay extends Service {
CountDownTimer cdt;
public static Handler mHandler;
int downer = 1000;
int time = 100;
int mainTime = 100000;
#Override
public void onCreate() {
super.onCreate();
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
cdt = new CountDownTimer(mainTime, downer) {
#Override
public void onTick(long millisUntilFinished) {
time -= 1;
Intent broadcastIntent = new Intent();
broadcastIntent.setAction(MainActivity.mBroadcastIntegerAction);
broadcastIntent.putExtra("Time", time);
sendBroadcast(broadcastIntent);
}
#Override
public void onFinish() {
time = 100;
this.start();
}
};
cdt.start();
return super.onStartCommand(intent, flags, startId);
}
#Override
public IBinder onBind(Intent arg0) {
return null;
}
}

onStartCommand is triggered everytime startService is called and in onStartCommand you are creating new countdown object,
Add a null check before creating new countdown object it will fix your duplicate timer running at same time.
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
If(cdt == null) {
cdt = new CountDownTimer(mainTime, downer) {
#Override
public void onTick(long millisUntilFinished) {
time -= 1;
Intent broadcastIntent = new Intent();
broadcastIntent.setAction(MainActivity.mBroadcastIntegerAction);
broadcastIntent.putExtra("Time", time);
sendBroadcast(broadcastIntent);
}
#Override
public void onFinish() {
time = 100;
this.start();
}
};
cdt.start();
}
return super.onStartCommand(intent, flags, startId);
}

How to write an Android background service which never stops and keeps my variables values when I close my application?

I have to write an Android background service which never stops and keeps my variables alive.
Here is my service:
public class PollingService extends Service {
public static final String TAG = PollingService.class.getSimpleName();
public static int alap = 0;
public PollingService() {
}
#Override
public IBinder onBind(Intent intent) {
Log.d(TAG, "BIND");
return null;
}
#Override
public boolean onUnbind(Intent intent) {
Log.d(TAG, "UNBIND");
return true;
}
public class MyBinder extends Binder {
public PollingService getService() {
return PollingService.this;
}
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
//return super.onStartCommand(intent, flags, startId);
final Handler handler = new Handler();
final Runnable r = new Runnable() {
public void run() {
alap = alap+1;
Log.d(TAG, ": "+alap+"");
handler.postDelayed(this, 1000);
}
};
handler.postDelayed(r, 1000);
return START_STICKY;
}
#Override
public void onDestroy() {
Log.d(TAG, "DESTROY");
}
}
This is a counter service and it works well when my app is running, but when I close the app my variable "alap" start counting again from zero.
I bind and unbind when I navigate from an Activity to another, but I need my variables values when I close the app.

The only way is to use the method startForeground() in your service. Try something like this:
public int onStartCommand(Intent intent, int flags, int startId) {
startForeground(1, new Notification());

Try to store your variable value in "SharedPreference" in onDestory function.
SharedPreferences sharedpreferences;
sharedpreferences = getSharedPreferences(MyPREFERENCES, Context.MODE_PRIVATE);
public int onStartCommand(Intent intent, int flags, int startId) {
//return super.onStartCommand(intent, flags, startId);
final Handler handler = new Handler();
final Runnable r = new Runnable() {
public void run() {
alap = sharedpreferences.getString("alap",null);
alap = alap+1;
Log.d(TAG, ": "+alap+"");
handler.postDelayed(this, 1000);
}
};
handler.postDelayed(r, 1000);
return START_STICKY;
}
#Override
public void onDestroy() {
//storing data
SharedPreferences.Editor editor = sharedpreferences.edit();
editor.putString("alap", alap);
editor.commit();
Log.d(TAG, "DESTROY");
}

How to know if phone app is closed

please explain me how does android call lock screen after closing emergency dialer. I've tried to check every second if emergency call is the top activity if it's not then i just lock device but this didn't do it's job in android 5.0 and higher. So, I need another solution.
My code:
private static final long INTERVAL = TimeUnit.SECONDS.toMillis(1/100);
private Thread t = null;
private Context ctx = null;
private boolean running = false;
public MyService2() {
}
#Override
public IBinder onBind(Intent intent) {
return null;
}
#Override
public void onCreate() {
super.onCreate();
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
final ActivityManager activityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
running = true;
ctx = this;
Log.i("Point","PreRun");
t = new Thread(new Runnable() {
#Override
public void run() {
Log.i("Point","preloop");
do {
Log.i("Point", "Prechech");
if (activityManager.getRunningTasks(1).get(0).topActivity.getPackageName().equals("com.android.phone") || activityManager.getRunningTasks(1).get(0).topActivity.getPackageName().equals("com.android.dialer"))
{
try {
Thread.sleep(INTERVAL);
} catch (InterruptedException e) {
Log.i("Point", "Thread interrupted: 'KioskService'");
}
} else {
running=false;
Log.i("Task is",activityManager.getRunningTasks(1).get(0).topActivity.getPackageName());
stopSelf();
}
}while (running) ;
}
});
t.start();
Log.i("Point","Done");
return super.onStartCommand(intent, flags, startId);
}
#Override
public void onDestroy() {
super.onDestroy();
Log.i("Point","Service is stopped");
}
}
And this:
public class MyActivity extends Activity{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button button = (Button) findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent("com.android.phone.EmergencyDialer.DIAL");
startActivity(intent);
Intent intent1 = new Intent(MyActivity.this,MyService2.class);
startService(intent1);
}
});
}
}

You can launch your emergency dialer like this:
Intent intent = new Intent("android.intent.action.MAIN");
intent.setComponent(ComponentName.unflattenFromString("com.android.phone/.EmergencyDialer"));
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
Moreover please check if you have declared your service properly in manifest.
<service
android:name=".MyService2">
</service>

Service Broadcast Receiver Logs more than expected

My problem is that I think my service runs multiple times. The service is controlled by a switch calling a method that starts and stops the service. I have a broadcast listener inside my service and the receiver logs whenever it receives a broadcast. at first switch on, it logs two times. After switch off and on, it logs four times.
public class Service1 extends Service implements DetectionListener {
private static final String TAG = "ListenerService";
private final broadcastReceiver1 receiver = new broadcastReceiver1();
public HashMap<String, String> hashMapData;
private ARSonicManager arSonicManager;
public ListenerService() {
}
#Override
public IBinder onBind(Intent intent) {
return null;
}
#Override
public void onCreate() {
super.onCreate();
IntentFilter filter = new IntentFilter();
filter.addAction("com.digify.almostrealsonic.broadcast_intent");
registerReceiver(receiver, filter);
}
#Override
public void onDestroy() {
unregisterReceiver(receiver);
super.onDestroy();
}
#Override
public void onStart(Intent intent, int startId) {
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
if (null != intent) {
try {
hashMapData = (HashMap<String, String>) intent.getSerializableExtra("hashMapData");
// Do something with hashMapData
} catch (Exception e) {
Log.i("onStartCommand", e.toString());
}
}
return super.onStartCommand(intent, flags, startId);
}
#Override
public void onMarkerDetected(String markerKey) {
Intent intent = new Intent();
intent.putExtra("hashMapData", hashMapData);
intent.setAction("com.broadcastReceiver1_intent");
sendBroadcast(intent);
}
public static class broadcastReceiver1 extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
String hashMapData = intent.getStringExtra("hashMapData");
Log.i("receiver", "Got message: " + hashMapData);
}
}
}