I want to be notified when a specific file changes. I was looking into FileObserver but after having read the answer in this thread, I've tried to accomplish my target with a JobScheduler that should run the job when the file changes, using addTriggerContentUri().
I started by copying the example from the documentation page, changing the Uri that should trigger the job to Uri.fromFile(File(<path-to-file>)). Unfortunately, my onStartJob() method is never called although JobScheduler::schedule() returns success.
Now, I am wondering if I've done anything wrong or if there is a general flaw in my interpretations, maybe it is just impossible to trigger a job on ordinary file changes?
The stripped-down version of my class/code looks like this (Kotlin):
class FilechangeService : JobService() {
companion object {
private const val JOB_ID = 0
// Schedule this job, replace any existing one.
fun scheduleJob(context: Context) {
// JobInfo Builder to construct the Job
val builder = JobInfo.Builder(
JOB_ID,
ComponentName(context, FilechangeService::class.java)
)
// Look for changes to specific file
val uri = Uri.fromFile(File(<path-to-file>))
builder.addTriggerContentUri(
JobInfo.TriggerContentUri(uri, 0)
)
val jobInfo = builder.build()
val js = context.getSystemService(JobScheduler::class.java)
val status = js.schedule(jobInfo)
}
}
override fun onStartJob(params : JobParameters) : Boolean {
// Code that is never executed =(
return false
}
}
Of course, FilechangeService::scheduleJob() is called from an other part of my application. Furthermore, I have added the Service to my AndroidManifest.xml with android:permission="android.permission.BIND_JOB_SERVICE".
Thanks in advance for any help!
To sum up what has been said in the comments, it seems to be impossible to do what I tried to achieve. This is due to the fact that the Uri has to be a "content Uri", so a "file Uri" seems to be invalid.