kotlin

问题 I read all the kotlinx UI docs and implement a ScopedActivity like described there (see the code below). In my ScopedActivity implementation, I also add a CouroutineExceptionHandler and despite that I pass my exception handler to all my coroutines, my users are experiencing crashes and the only info I get in the stacktrace is "Job was cancelled". I searched for a couple of days now but I did not find a solution and my users are still randomly crashing but I do not understand why... Here is my

问题 i'm working with firestore, and getting stuck when i get the timestamp from firestore. how i convert this Timestamp(seconds=1556006384, nanoseconds=994000000) to Date in kotlin. my minimum SDK is 21 so the code below doesn't work val timestamp = it["time"] as com.google.firebase.Timestamp val milliseconds = timestamp.seconds * 1000 + timestamp.nanoseconds / 1000000 val tz = ZoneId.of("Asia/Jakarta (UTC+07:00)") val localDateTime = LocalDateTime.ofInstant(Instant.ofEpochMilli(milliseconds), tz

问题 I have read the docs about HTTP requests in Ktor clients, but it lacks of an example of file upload. It mentions PartData.FileItem , but it's unclear how to use it. So, how do I prepare a multipart/form-data request for file upload in Ktor? 回答1: You should use submitFormWithBinaryData's formData parameter to provide a list of parts. There is a helper function with the same name to create such list. HttpClient(Apache).use { client -> val parts: List<PartData> = formData { // Regular form

问题 I have read the docs about HTTP requests in Ktor clients, but it lacks of an example of file upload. It mentions PartData.FileItem , but it's unclear how to use it. So, how do I prepare a multipart/form-data request for file upload in Ktor? 回答1: You should use submitFormWithBinaryData's formData parameter to provide a list of parts. There is a helper function with the same name to create such list. HttpClient(Apache).use { client -> val parts: List<PartData> = formData { // Regular form

问题 As definied combineLatest in rx emites only if all values have changed at least once. (so long as each of the source Observables has emitted at least one item) I use it to manipulate views within my android views. For example, I enable a call to action button as soon as all observables emitted a valid value. Otherwise I disable it. Observable.combineLatest( toObservable(email), toObservable(username), toObservable(status), toObservable(phonenumber), toObservable(birthdate), Function5<String,

问题 As definied combineLatest in rx emites only if all values have changed at least once. (so long as each of the source Observables has emitted at least one item) I use it to manipulate views within my android views. For example, I enable a call to action button as soon as all observables emitted a valid value. Otherwise I disable it. Observable.combineLatest( toObservable(email), toObservable(username), toObservable(status), toObservable(phonenumber), toObservable(birthdate), Function5<String,

问题 There is two presumably identical snippets: // Verbose version val typedArray = context.obtainStyledAttributes(attrs, styleable) block(typedArray) typedArray.recycle() // One-line version context.obtainStyledAttributes(attrs, styleable).also(block).recycle() I'm wonder why verbose block of code looks fine to Android Studio, whereas one-line version highlights obtainStyledAttributes and gives following warning: This TypedArray should be recycled after use with #recycle() Does anyone know is it

问题 On Android 11 my MediaRecorder fails to initialize. I suspect the problem is related to scopedstorage, but I have been unable to figure out the cause. I am using MediaRecorder to record audio from the microphone. I extract the amplitude from the audio, so I have no intention to keep the file, that is why the path is /dev/null var mRecorder: MediaRecorder? = null if (mRecorder == null) { mRecorder = MediaRecorder() mRecorder!!.setAudioSource(MediaRecorder.AudioSource.MIC) mRecorder!!

问题 While migration to Kotlin from Java I faced with a problem. I overrided Object 's finalize() method: @Override protected void finalize() throws Throwable { stopTimer(); super.finalize(); } When I tried to do the same with Kotlin I found to solutions. The first one is from the doc: protected fun finalize() { stopTimer() super.finalize() } And the second one from the article (it's in Russian): @Suppress("ProtectedInFinal", "Unused") protected fun finalize() { stopTimer() super.finalize() } But

问题 While migration to Kotlin from Java I faced with a problem. I overrided Object 's finalize() method: @Override protected void finalize() throws Throwable { stopTimer(); super.finalize(); } When I tried to do the same with Kotlin I found to solutions. The first one is from the doc: protected fun finalize() { stopTimer() super.finalize() } And the second one from the article (it's in Russian): @Suppress("ProtectedInFinal", "Unused") protected fun finalize() { stopTimer() super.finalize() } But