From b263e5e0a78479bb595547ffa04329a0283693df Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C3=A9ter=20Horv=C3=A1th?= <horvvpeter@gmail.com>
Date: Tue, 9 Apr 2019 18:31:30 +0200
Subject: [PATCH] 
 NotificationScheduler/app/src/main/java/com/android/example/notificationscheduler/MainActivity.java:
 Fix scheduler crash

---
 .../android/example/notificationscheduler/MainActivity.java  | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/NotificationScheduler/app/src/main/java/com/android/example/notificationscheduler/MainActivity.java b/NotificationScheduler/app/src/main/java/com/android/example/notificationscheduler/MainActivity.java
index b408c28a..3e888c21 100644
--- a/NotificationScheduler/app/src/main/java/com/android/example/notificationscheduler/MainActivity.java
+++ b/NotificationScheduler/app/src/main/java/com/android/example/notificationscheduler/MainActivity.java
@@ -51,8 +51,6 @@ protected void onCreate(Bundle savedInstanceState) {
 
         final TextView seekBarProgress = findViewById(R.id.seekBarProgress);
 
-        mScheduler = (JobScheduler) getSystemService(JOB_SCHEDULER_SERVICE);
-
         // Updates the TextView with the value from the seekbar.
         mSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
             @Override
@@ -119,6 +117,9 @@ public void scheduleJob(View view) {
 
         if (constraintSet) {
             JobInfo myJobInfo = builder.build();
+            if (mScheduler == null) {
+                mScheduler = (JobScheduler) getSystemService(JOB_SCHEDULER_SERVICE);
+            }
             mScheduler.schedule(myJobInfo);
             Toast.makeText(this, R.string.job_scheduled, Toast.LENGTH_SHORT)
                     .show();