小编Jem*_*ili的帖子

当我打电话给 realm.where(MessageEventModel::class.java).findAll()

抛出异常:这是错误

java.lang.IllegalArgumentException: MessageEventModel is not part of the schema for this Realm
                                                                          at io.realm.internal.modules.CompositeMediator.getMediator(CompositeMediator.java:172)
                                                                     at io.realm.internal.modules.CompositeMediator.getTableName(CompositeMediator.java:90)

这是我的Application类

class MyApp : Application() {

override fun onCreate() {
    super.onCreate()
    Realm.init(this)
    val realmConfiguration = RealmConfiguration.Builder()
            .deleteRealmIfMigrationNeeded()
            .name("my_db")
            .build()
    Realm.setDefaultConfiguration(realmConfiguration)
}
}

这是我的境界模型

class MessageEventModel : RealmObject{
  constructor()
  var message = ""
  constructor(message: String) : this(){
    this.message = message
  }
}

这是我正在尝试检索模型的地方

class AwesomeChatFragment : Fragment() {

private val realm: Realm by lazy { Realm.getDefaultInstance() }
private var notifications: RealmResults<MessageEventModel>? = null …

我是scala世界的新手(来自android世界),我用play-framework创建了scala项目,一切正常,我需要添加数据库,为此我决定选择光滑,但是当我试图添加时像这样的依赖

libraryDependencies ++= Seq(
  "com.typesafe.slick" %% "slick" % "3.1.0",
  "org.slf4j" % "slf4j-nop" % "1.6.4"
)

我收到此错误日志

Error:Error while importing SBT project:<br/>...<br/><pre>[info] Resolving com.typesafe#jse_2.10;1.2.3 ...
[info] Resolving org.scala-sbt#run;0.13.15 ...
[info] Resolving org.scala-sbt.ivy#ivy;2.3.0-sbt-48dd0744422128446aee9ac31aa356ee203cc9f4 ...
[info] Resolving com.typesafe.play#play-exceptions;2.6.5 ...
[info] Resolving org.scala-sbt#test-interface;1.0 ...
[info] Resolving com.jcraft#jsch;0.1.50 ...
[info] Resolving org.scala-lang#scala-compiler;2.10.6 ...
[info] Resolving jline#jline;2.14.3 ...
[info] Resolving org.scala-sbt#compiler-ivy-integration;0.13.15 ...
[info] Resolving org.scala-sbt#incremental-compiler;0.13.15 ...
[info] Resolving org.scala-sbt#logic;0.13.15 ...
[info] Resolving com.typesafe#config;1.3.1 ...
[info] Resolving org.scala-sbt#main-settings;0.13.15 ...
[info] Resolving com.lightbend.play#play-file-watch_2.10;1.0.0 ...
[info] Resolving …

我正在遵循Fabric的官方文档来添加crashlytic，我已经成功地将所有内容添加到gradle.build文件中，但是现在当我尝试编写Fabric.with(this, new Crashlytics()); 时说：

 Error:(163, 31) error: cannot find symbol class Crashlytics
Error:(163, 9) error: cannot find symbol variable Fabric
Error:Execution failed for task ':compileDebugJavaWithJavac'.
> Compilation failed; see the compiler error output for details.

这是我的gradle.build文件

....
apply plugin: 'io.fabric'

buildscript {
ext.kotlin_version = '1.1.51'
repositories {
    jcenter()
    mavenCentral()
    maven {
        url 'https://maven.google.com'
    }
    maven { url 'https://maven.fabric.io/public' }

}
dependencies {
    ....
    classpath 'io.fabric.tools:gradle:1.24.3'

    }
}

repositories {
    jcenter()
    mavenCentral()
    maven { url "https://jitpack.io" }
    maven {
        url …

我播放声音有问题，当通知来时，通知显示，但没有声音或振动，我看到很多关于如何将声音和振动设置到通知频道的问题和答案，但它不起作用，这就是我正在尝试的方式

val pattern = longArrayOf(0, 200, 60, 200)
val chatSound = Uri.parse("${ContentResolver.SCHEME_ANDROID_RESOURCE}://" + context.packageName + "/" + R.raw.chat_alert)
val mBuilder = NotificationCompat.Builder(context, CHANNEL_ID)
  .setSmallIcon(R.mipmap.ic_launcher)
  .setContentTitle(title)
  .setContentText(body)
val mNotificationManager = context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager

val notification = mBuilder.build()

if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
  val mChanel = NotificationChannel(CHANNEL_ID, "test", NotificationManager.IMPORTANCE_HIGH)
  val audioAttributes = AudioAttributes.Builder()
    .setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
    .build()
  mChanel.setSound(chatSound, audioAttributes)
  mChanel.enableVibration(true)
  mChanel.enableLights(true)
  mChanel.vibrationPattern = pattern
  mNotificationManager.createNotificationChannel(mChanel)
}
mNotificationManager.notify(i, notification)

我正在为 Android Pie 测试它

targetSdkVersion 28

我正在尝试使用Rx方式使用房间从数据库中检索数据.这就是我试图这样做的方式

override fun onStart() {
    super.onStart()
    disposable.add(presenter.getAllBooks()
              .subscribeOn(Schedulers.io())
              .observeOn(AndroidSchedulers.mainThread())
              .subscribe({
                 println(it.size())
              }))
}

这是getAllBooks()演示者内部的方法

fun getAllBooks() : Flowable<List<Book>> {
    val isMainThread = Looper.myLooper() == Looper.getMainLooper()
    if (!isMainThread) {
        updateBooks()
        return db.bookDao().allBooks
    }
    return Flowable.empty()
}

这里isMainThread变量总是true,我也试过observeOn(Shcedulers.io()),但同样的问题.