Jairo Barros jairobjunior

There is a very common pattern using CountDownLatch when developing with Android, sometimes you want to make an async implementation to be sync when dealing with BroadcastReceivers and CountDownLatch is pretty handy. The AOSP is filled with CountDownLatch(1).

private suspend fun yourSuspendMethod() {
    val job = GlobalScope.async {    
        val latch = CountDownLatch(1)

        val watcher = object : BroadcastReceiver() {

 override fun onReceive(context: Context?, intent: Intent?) {

	object Benchmark {

	inline fun <reified T : Any> process(tag: String, block: () -> T) : T {
	val now = System.currentTimeMillis()
	val result = block.invoke()
	val delta = System.currentTimeMillis() - now
	println("Benchmark :: $tag :: Took ms=$delta")
	return result
	}
	}

	== Adb Server
	adb kill-server
	adb start-server

	== Adb Reboot
	adb reboot
	adb reboot recovery
	adb reboot-bootloader

	== Shell

	/**
	* Downloads all android-all dependencies and copies them to the mavenLocal() repository
	*
	* Once applied to your gradle project, can be executed with ./gradlew robolectricSdkDownload
	*/

	import java.nio.file.Files

	// The general idea of this was borrowed from https://gist.github.com/xian/05c4f27da6d4156b9827842217c2cd5c
	// I then modified it heavily to allow easier addition of new SDK versions

	Android version:
	`adb shell getprop ro.build.version.release`

	>> 6.0.1

	Android API Level:
	`adb shell getprop ro.build.version.sdk`

	>> 23

	public func benchmarking(operationName: String, operation: ()->()) {
	let startTime = CFAbsoluteTimeGetCurrent()
	operation()
	let timeElapsed = CFAbsoluteTimeGetCurrent() - startTime
	print("Time elapsed for \(operationName): \(timeElapsed) s")
	}

	for (double i = 1; i >= 0; i -= 0.01) {
	i = Math.round(i * 100) / 100.0d;
	int alpha = (int) Math.round(i * 255);
	String hex = Integer.toHexString(alpha).toUpperCase();
	if (hex.length() == 1) hex = "0" + hex;
	int percent = (int) (i * 100);
	System.out.println(String.format("%d%% — %s", percent, hex));
	}

	/*

	<?xml version="1.0" encoding="utf-8"?>
	<resources>
	<color name="white">#FFFFFF</color>
	<color name="ivory">#FFFFF0</color>
	<color name="lightyellow">#FFFFE0</color>
	<color name="yellow">#FFFF00</color>
	<color name="snow">#FFFAFA</color>
	<color name="floralwhite">#FFFAF0</color>
	<color name="lemonchiffon">#FFFACD</color>
	<color name="cornsilk">#FFF8DC</color>

	# Built application files
	/*/build/

	# Crashlytics configuations
	com_crashlytics_export_strings.xml

	# Local configuration file (sdk path, etc)
	local.properties

	# Gradle generated files