Created
September 28, 2018 07:24
-
-
Save yaraki/404cb95db96737c55fc6e3454cf81ff7 to your computer and use it in GitHub Desktop.
FPS as LiveData (with coroutine)
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/* | |
* Copyright (C) 2018 The Android Open Source Project | |
* | |
* Licensed under the Apache License, Version 2.0 (the "License"); | |
* you may not use this file except in compliance with the License. | |
* You may obtain a copy of the License at | |
* | |
* http://www.apache.org/licenses/LICENSE-2.0 | |
* | |
* Unless required by applicable law or agreed to in writing, software | |
* distributed under the License is distributed on an "AS IS" BASIS, | |
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
* See the License for the specific language governing permissions and | |
* limitations under the License. | |
*/ | |
package io.github.yaraki.playground | |
import android.arch.lifecycle.LiveData | |
import android.arch.lifecycle.MutableLiveData | |
import android.arch.lifecycle.ViewModel | |
import kotlinx.coroutines.experimental.CoroutineScope | |
import kotlinx.coroutines.experimental.Dispatchers | |
import kotlinx.coroutines.experimental.Job | |
import kotlinx.coroutines.experimental.android.Main | |
import kotlinx.coroutines.experimental.android.awaitFrame | |
import kotlinx.coroutines.experimental.isActive | |
import kotlinx.coroutines.experimental.launch | |
import java.util.concurrent.TimeUnit | |
class MainViewModel : ViewModel() { | |
private val job = Job() | |
private val scope = CoroutineScope(Dispatchers.Main + job) | |
val fps: LiveData<String> by lazy(LazyThreadSafetyMode.NONE) { | |
MutableLiveData<String>().also { liveData -> | |
scope.launch { | |
var count = 0 | |
val oneSecond = TimeUnit.SECONDS.toNanos(1) | |
var start = System.nanoTime() | |
while (isActive) { | |
val now = awaitFrame() | |
count++ | |
if (now - start >= oneSecond) { | |
liveData.value = count.toString() | |
count = 0 | |
start = now | |
} | |
} | |
} | |
} | |
} | |
override fun onCleared() { | |
super.onCleared() | |
job.cancel() | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment