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Firebase Databaseからの問題のリストを取得し、LiveDataを返します。コードの私の活動のLiveData Obsereverは最初の値をキャッチします
fun getAllIssues(): MutableLiveData<IssueEntity> {
val issues: MutableLiveData<IssueEntity> = MutableLiveData()
val issuesReference = FirebaseDatabase.getInstance().reference.child("issues")
issuesReference.addValueEventListener(object : ValueEventListener {
override fun onCancelled(p0: DatabaseError?) {
}
override fun onDataChange(snapshot: DataSnapshot?) {
if (snapshot == null) {
return
}
snapshot.children.forEach({
val issueMessage = it.child("message").value.toString()
val issueTitle = it.child("title").value.toString()
val issueOwner = it.child("owner").value.toString()
issues.postValue(IssueEntity(issueTitle, issueMessage, issueOwner))
})
}
})
return issues
}
：
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_all_issues)
val issues: MutableList<IssueEntity> = mutableListOf()
issuesList.adapter = IssuesAdapter(issues)
IssueRepository().getAllIssues().observe(this, Observer {
if (it != null) {
issues.add(it)
val issuesAdapter = issuesList.adapter as IssuesAdapter
issuesAdapter.notifyDataSetChanged()
}
})
}
しかし、オブザーバーは、最初の値のみを取得します。理由を教えてください。