I am working on an App for which I am setting an alarm with alarmManager and when broadcast receiver received the pending intent I passed it into Service class to show a notification.and also passing an intent to check which type to alarm is being received.but when my app is in background it stops working because it received null value from intent. Here is my code :
In MainActivity.java :
@Override
protected Dialog onCreateDialog(int id) {
if (id == DIALOG_ID) {
return new TimePickerDialog(MainActivity.this, kTimePickerListener,
hour, min, false);
}
return null;
}
protected TimePickerDialog.OnTimeSetListener kTimePickerListener =
new TimePickerDialog.OnTimeSetListener() {
@Override
public void onTimeSet(TimePicker timePicker, int hourofday, int
minutes) {
hour = hourofday;
min = minutes;
Calendar calendar = Calendar.getInstance();
// set selected time from timepicker to calendar
calendar.set(Calendar.HOUR_OF_DAY, hour);
calendar.set(Calendar.MINUTE, minutes);
Intent myIntent = new Intent(MainActivity.this,
ServiceManager.class);
myIntent.putExtra("reqcode", 11);
// A PendingIntent specifies an action to take in the
// future
PendingIntent mPendingIntent =
PendingIntent.getBroadcast(MainActivity.this, 11, myIntent, 0);
// set alarm time
alarmManager = (AlarmManager) MainActivity.this
.getSystemService(Context.ALARM_SERVICE);
alarmManager.set(AlarmManager.RTC, calendar.getTimeInMillis(),
mPendingIntent);
}
};
i am sending a pending code with request code 11 and also sending an intent through pendingintent with myIntent.putExtra("reqcode", 11);
In my ServiceManager.class :
public class ServiceManager extends BroadcastReceiver
{
@Override
public void onReceive(Context context, Intent intent) {
int Noti_code = intent.getIntExtra("reqcode",-1);
Intent myIntent = new Intent(context,NotificationService.class);
myIntent.putExtra("reqcode", Noti_code);
context.startService(myIntent);
}
}
Here I am getting this code as a Noti_code passing it to my NotificationServices.class through Intent.
Here is NotificationServices.class :
public class NotificationService extends Service {
private NotificationManager mManager;
@Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public void onCreate() {
super.onCreate();
}
@SuppressWarnings({"static-access", "deprecation"})
@Override
public void onStart(Intent intent, int startId) {
super.onStart(intent, startId);
**int Noti_Code = intent.getIntExtra("reqcode",-2);** //App crashes here
if (Noti_Code == 11) {
mManager = (NotificationManager) this.getApplicationContext().getSystemService(this.getApplicationContext().NOTIFICATION_SERVICE);
ShowNotification(getApplicationContext(), mManager);
}
}
@Override
public void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
}
}
When my app is in backgroud it crashes here int Noti_Code = intent.getIntExtra("reqcode",-2);
Here is my Menifest.xml :
<uses-permission android:name="android.permission.WAKE_LOCK" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".Activity_detail" />
<activity android:name=".History" />
<service
android:name=".NotificationService"
android:enabled="true"
android:exported="true"
android:stopWithTask="false"/>
<receiver android:name=".ServiceManager"/>
</application>
And Here is the Logcat:
Process: com.spendless.spendless_financiallifestylesavingapp, PID: 3910
java.lang.RuntimeException: Unable to start service
com.spendless.spendless_financiallifestylesavingapp.Services.NotificationService@5f7f8c2 with null: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.content.Intent.getIntExtra(java.lang.String, int)' on a null object reference
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java)
at android.app.ActivityThread.access$2200(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java)
at android.os.Handler.dispatchMessage(Handler.java)
at android.os.Looper.loop(Looper.java)
at android.app.ActivityThread.main(ActivityThread.java)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.content.Intent.getIntExtra(java.lang.String, int)' on a null object reference
at com.spendless.spendless_financiallifestylesavingapp.Services.NotificationService.onStart(NotificationService.java:46)
at android.app.Service.onStartCommand(Service.java)
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java)
at android.app.ActivityThread.access$2200(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java)
at android.os.Handler.dispatchMessage(Handler.java)
at android.os.Looper.loop(Looper.java)
at android.app.ActivityThread.main(ActivityThread.java)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java)
Please help me if there is something missing in my code? Thanks.
You have implemented onStart() in your Service. This is not the correct method. You should implement onStartCommand(). The return value from onStartCommand() tells Android whether or not to restart your Service under certain conditions and how to redeliver any Intents. Using onStart() has some backwards compatibility support that automatically provides the value START_STICKY to control restart of your Service. This tells Android that you want your Service restarted all the time.
What you are probably seeing is that Android has restarted your Service with a null Intent. This can happen if Android kills your Service and then automatically restarts it (since you return START_STICKY).
See the documentation on Service and also onStart() and onStartCommand().