我在我的项目中使用Realm，我试图通过RxJava更新领域对象。 Realm对象已成功存储，但realm对象未更新。实际上我正在使用RxJava对UI线程和所有WRITE操作在后台线程上执行所有Read操作。下面是我执行所有Realm读写操作的代码。
class SuggestedFriendsController internal constructor(realm : Realm) {
private var realm: Realm? = null
init {
this.realm = realm
}
fun addSuggestedFriends(requestPojo: RequestPojo?) {
realm?.executeTransaction { realm ->
val realmFriends = RealmSuggestedFriends()
realmFriends.friendEmail = requestPojo?.email
realmFriends.friendImage = requestPojo?.image
realmFriends.friendName = requestPojo?.name
realmFriends.friendStatus = requestPojo?.status
realmFriends.friendThumbImage = requestPojo?.thumb_image
realmFriends.friendUid = requestPojo?.uid
realmFriends.requestSent = "No"
realm.copyToRealmOrUpdate(realmFriends)
}
}
fun getRequestStateSync(uid: String?): String? {
var res = Realm.getDefaultInstance().use { realm ->
realm?.where(RealmSuggestedFriends::class.java)
?.equalTo("friendUid", uid)
?.findFirst()
}
return res?.requestSent
}
fun getAllAsync() = Observable.create<List<RealmSuggestedFriends>> { emitter ->
Realm.getDefaultInstance().use { realm ->
val results = realm?.where(RealmSuggestedFriends::class.java)
?.findAll()
emitter.onNext(realm?.copyFromRealm(results)!!)
}
}.flatMapIterable { list -> list }
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
fun updateSuggestedFriendAsync(uid: String?, request_type: String?) =
Single.create<String>{emitter ->
Realm.getDefaultInstance().use {realm ->
realm?.executeTransaction{ realm ->
var suggested = realm.where(RealmSuggestedFriends::class.java)
.equalTo("friendUid", uid)
.findFirst()!!
suggested.requestSent = request_type
realm.insertOrUpdate(suggested)
}
emitter.onSuccess("success")
}
}.observeOn(AndroidSchedulers.mainThread())
.subscribeOn(Schedulers.io())
}
以下是我的活动代码。这里变量suggestedFriendController?.getRequestStateSync(friend_uid)值保持不变，即使其值在数据库中更改。
class SFriend : AppCompatActivity(){
private var image : NewCircularImagview ?= null
private var name : AppCompatTextView ?= null
private var addFriend : AppCompatButton ?= null
private var imageUrl : String ?= null
private var toolbar : Toolbar ?= null
private var toolbar_text : TextView ?= null
private var progressBar : ProgressBar ?= null
private var friend_uid : String ?= null
private var databaseReference: DatabaseReference? = null
private var uid: String? = null
private var compositeDisposable : CompositeDisposable ?= null
private var realm : Realm ?= null
private var suggestedFriendController : SuggestedFriendsController ?= null
private var request_state : String ?= null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.suggested_friend_profile)
initialize()
friend_uid = intent.getStringExtra("friend_uid")
imageUrl = intent.getStringExtra("imageurl")
name?.text = intent.getStringExtra("name")
request_state = suggestedFriendController?.getRequestStateSync(friend_uid)
if (request_state?.equals("No")!!){
addFriend?.setText("Send Request")
}else{
addFriend?.text = "Cancel Request"
}
}
private fun initialize() {
compositeDisposable = CompositeDisposable()
databaseReference = FirebaseDatabase.getInstance().reference
databaseReference?.keepSynced(true)
uid = FirebaseAuth.getInstance().currentUser?.uid
progressBar = findViewById(R.id.progress_bar)
image = findViewById(R.id.profile_pic)
name = findViewById(R.id.name)
addFriend = findViewById(R.id.addFriend)
toolbar = findViewById(R.id.toolbar)
toolbar_text = toolbar?.findViewById(R.id.toolbar_text1)
toolbar_text?.visibility = View.VISIBLE
setSupportActionBar(toolbar)
supportActionBar?.setDisplayHomeAsUpEnabled(true)
getSupportActionBar()?.setHomeButtonEnabled(true)
realm = Realm.getDefaultInstance()
suggestedFriendController = realm?.let { r-> SuggestedFriendsController(r) }
}
override fun onStart() {
super.onStart()
progressBar?.visibility = View.VISIBLE
Picasso.with(this).load(imageUrl!!).into(image,object :Callback{
override fun onSuccess() {
progressBar?.visibility = View.GONE
}
override fun onError() {
showMessage("image loading failed")
}
})
addFriend?.setOnClickListener {
addFriend?.isEnabled = false
if (request_state?.equals("No")!!) {
sendRequest(friend_uid)
}else{
cancelRequest(friend_uid)
}
}
}
private fun cancelRequest(friend_uid: String?) {
Single.create<String>{ subscriber ->
databaseReference
?.child("friend_requests")
?.child(uid)
?.child(friend_uid)
?.removeValue()
?.addOnCompleteListener { task ->
if (task.isSuccessful) {
if (!subscriber.isDisposed) {
subscriber.onSuccess("success")
}
}else{
subscriber.onError(Throwable("error in cancel request"))
}
}
}.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.flatMap { Single.create<String>{ subscriber ->
databaseReference
?.child("friend_requests")
?.child(friend_uid)
?.child(uid)
?.removeValue()
?.addOnCompleteListener { task ->
if (task.isSuccessful){
if (!subscriber.isDisposed){
subscriber.onSuccess("success")
}
}else{
subscriber.onError(Throwable("error in cancel request"))
}
}
}.subscribeOn(Schedulers.io())
}
.subscribe({
t1 -> showMessage(t1)
addFriend?.text = "Send Request"
addFriend?.isEnabled = true
suggestedFriendController?.updateSuggestedFriend(friend_uid!!,"No")
},{
t2 -> showMessage(t2.message)
})
}
private fun showMessage(message : String?) {
Toast.makeText(this,message,Toast.LENGTH_SHORT).show()
}
private fun sendRequest(friend_uid : String?){
var d = Single.create<String>{ subscriber ->
databaseReference
?.child("friend_requests")
?.child(uid)
?.child(friend_uid)
?.child("request_type")
?.setValue("sent")
?.addOnCompleteListener { task ->
if (task.isSuccessful){
if (!subscriber.isDisposed){
subscriber.onSuccess("success")
}
}else{
subscriber.onError(Throwable("request failed"))
}
}
}.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.flatMap { Single.create<String> { subscriber ->
databaseReference
?.child("friend_requests")
?.child(friend_uid)
?.child(uid)
?.child("request_type")
?.setValue("received")
?.addOnCompleteListener { task ->
if (task.isSuccessful){
if (!subscriber.isDisposed){
subscriber.onSuccess("sent")
}
}else{
subscriber.onError(Throwable("request failed"))
}
}
}.subscribeOn(Schedulers.io())
}.flatMap {
suggestedFriendController?.updateSuggestedFriendAsync(friend_uid,"Yes")
}.subscribe({
t1: String? -> showMessage(t1)
addFriend?.text = "Delete Request"
addFriend?.isEnabled = true
},{
t2 -> showMessage(t2.message)
}
)
compositeDisposable?.add(d)
}
override fun onBackPressed() {
super.onBackPressed()
finish()
}
override fun onStop() {
super.onStop()
compositeDisposable?.clear()
}
override fun onDestroy() {
super.onDestroy()
realm?.close()
}
}
下面的代码是我的Realm模型。
open class RealmSuggestedFriends : RealmObject(){
@Required
@PrimaryKey
var friendUid : String ?= null
@Required
var friendName : String ?= null
@Required
var friendEmail : String ?= null
@Required
var friendStatus : String ?= null
@Required
var friendImage : String ?= null
@Required
var friendThumbImage : String ?= null
@Required
var requestSent : String ?= null
}
我需要你的建议才能让它发挥作用。帮帮我
答案 0 :(得分：1)
不要获取String，获取对象。此外，我不会将Realm实例传递给类似的构造函数。
class SuggestedFriendsController {
fun addSuggestedFriends(requestPojo: RequestPojo) {
Realm.getDefaultInstance().use { r ->
{
r.executeTransaction { realm ->
realm.insertOrUpdate(RealmSuggestedFriends().apply {
friendEmail = requestPojo?.email
friendImage = requestPojo?.image
friendName = requestPojo?.name
friendStatus = requestPojo?.status
friendThumbImage = requestPojo?.thumb_image
friendUid = requestPojo?.uid
requestSent = "No"
})
}
}
}
fun getSuggestedFriend(realm: Realm, uid: String): RealmSuggestedFriends? =
realm.where<RealmSuggestedFriends>().equalTo("friendUid", uid).findFirst()
fun getAllAsync() = Single.create<List<RealmSuggestedFriends>> { emitter ->
Realm.getDefaultInstance().use { realm ->
with(realm) {
emitter.onNext(copyFromRealm(where<RealmSuggestedFriends>().findAll())
}
}
}.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
fun updateSuggestedFriendAsync(uid: String, requestType: String) =
Single.create<String> { emitter ->
Realm.getDefaultInstance().use { r ->
r.executeTransaction { realm ->
var suggested = realm.where<RealmSuggestedFriends>()
.equalTo("friendUid", uid)
.findFirst()!!
suggested.requestSent = requestType
realm.insertOrUpdate(suggested)
}
emitter.onSuccess("success")
}
}.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
}
class SFriend : AppCompatActivity() {
private lateinit var image: NewCircularImagview
private lateinit var name: AppCompatTextView
private lateinit var addFriend: AppCompatButton
private lateinit var imageUrl: String
private lateinit var toolbar: Toolbar
private lateinit var toolbar_text: TextView
private lateinit var progressBar: ProgressBar
private lateinit var friend_uid: String
private lateinit var databaseReference: DatabaseReference
private lateinit var uid: String
private lateinit var compositeDisposable: CompositeDisposable
private lateinit var realm: Realm
private lateinit var suggestedFriendController: SuggestedFriendsController
private var suggestedFriend: RealmSuggestedFriends
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.suggested_friend_profile)
initialize()
friend_uid = intent.getStringExtra("friend_uid")
imageUrl = intent.getStringExtra("imageurl")
name.text = intent.getStringExtra("name")
suggestedFriend = suggestedFriendController.getRequestStateSync(realm, friend_uid)
addFriend.text = when {
"No" == suggestedFriend?.requestSent -> "Send Request"
else ->
= "Cancel Request"
}
suggestedFriend.addChangeListener(RealmChangeListener {
if(it.isValid()) {
addFriend.text = when {
"No" == it.requestSent -> "Send Request"
else -> "Cancel Request"
}
}
})
}
private fun initialize() {
compositeDisposable = CompositeDisposable()
databaseReference = FirebaseDatabase.getInstance().reference
databaseReference.keepSynced(true)
uid = FirebaseAuth.getInstance().currentUser?.uid
progressBar = findViewById(R.id.progress_bar)
image = findViewById(R.id.profile_pic)
name = findViewById(R.id.name)
addFriend = findViewById(R.id.addFriend)
toolbar = findViewById(R.id.toolbar)
toolbar_text = toolbar?.findViewById(R.id.toolbar_text1)
toolbar_text.visibility = View.VISIBLE
setSupportActionBar(toolbar)
supportActionBar!!.setDisplayHomeAsUpEnabled(true)
supportActionBar!!.setHomeButtonEnabled(true)
realm = Realm.getDefaultInstance()
suggestedFriendController = SuggestedFriendsController()
}
override fun onStart() {
super.onStart()
progressBar.visibility = View.VISIBLE
Picasso.with(this).load(imageUrl).into(image, object : Callback {
override fun onSuccess() {
progressBar.visibility = View.GONE
}
override fun onError() {
showMessage("image loading failed")
}
})
addFriend.setOnClickListener {
addFriend.isEnabled = false
if ("No" == suggestedFriend?.requestSent) {
sendRequest(friend_uid)
} else {
cancelRequest(friend_uid)
}
}
}
private fun cancelRequest(friend_uid: String?) {
Single.create<String> { subscriber ->
databaseReference
.child("friend_requests")
.child(uid)
.child(friend_uid)
.removeValue()
.addOnCompleteListener { task ->
if (task.isSuccessful) {
if (!subscriber.isDisposed) {
subscriber.onSuccess("success")
}
} else {
subscriber.onError(Throwable("error in cancel request"))
}
}
}.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.flatMap {
Single.create<String> { subscriber ->
databaseReference
.child("friend_requests")
.child(friend_uid)
.child(uid)
.removeValue()
.addOnCompleteListener { task ->
if (task.isSuccessful) {
if (!subscriber.isDisposed) {
subscriber.onSuccess("success")
}
} else {
subscriber.onError(Throwable("error in cancel request"))
}
}
}.subscribeOn(Schedulers.io())
}
.subscribe({ t1 ->
showMessage(t1)
addFriend.text = "Send Request"
addFriend.isEnabled = true
suggestedFriendController.updateSuggestedFriend(friend_uid!!, "No")
}, { t2 ->
showMessage(t2.message)
})
}
private fun showMessage(message: String?) {
Toast.makeText(this, message, Toast.LENGTH_SHORT).show()
}
private fun sendRequest(friend_uid: String?) {
var d = Single.create<String> { subscriber ->
databaseReference
.child("friend_requests")
.child(uid)
.child(friend_uid)
.child("request_type")
.setValue("sent")
.addOnCompleteListener { task ->
if (task.isSuccessful) {
if (!subscriber.isDisposed) {
subscriber.onSuccess("success")
}
} else {
subscriber.onError(Throwable("request failed"))
}
}
}.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.flatMap {
Single.create<String> { subscriber ->
databaseReference
.child("friend_requests")
.child(friend_uid)
.child(uid)
.child("request_type")
.setValue("received")
.addOnCompleteListener { task ->
if (task.isSuccessful) {
if (!subscriber.isDisposed) {
subscriber.onSuccess("sent")
}
} else {
subscriber.onError(Throwable("request failed"))
}
}
}.subscribeOn(Schedulers.io())
}.doOnNext {
suggestedFriendController.updateSuggestedFriendAsync(friend_uid, "Yes")
}.subscribe({ t1: String? ->
realm.refresh()
showMessage(t1)
addFriend.text = "Delete Request"
addFriend.isEnabled = true
}, { t2 ->
showMessage(t2.message)
})
compositeDisposable.add(d)
}
override fun onBackPressed() {
super.onBackPressed()
finish()
}
override fun onStop() {
super.onStop()
compositeDisposable.clear()
}
override fun onDestroy() {
super.onDestroy()
suggestedFriend.removeAllChangeListeners()
realm.close()
}
}
}