sphrak

#!/bin/bash

# Simple bash script runs adb to measure startup time of android apps

trap ctrl_c INT

time=()

function ctrl_c() {
    total=0

sphrak

Useful unix commands

recursively search files matching *.fileExt for pattern in current directory

grep --color -inr --include \*.kt 'SDK_INT' .

Detect how many gradle daemons are running

sphrak

In your local clone of your forked repository, you can add the original GitHub repository as a "remote". ("Remotes" are like nicknames for the URLs of repositories - origin is one, for example.) Then you can fetch all the branches from that upstream repository, and rebase your work to continue working on the upstream version. In terms of commands that might look like:

Add the remote, call it "upstream":

git remote add upstream https://github.com/whoever/whatever.git

Fetch all the branches of that remote into remote-tracking branches, such as upstream/master:

sphrak

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

sphrak

class MainActivity : AppCompatActivity(R.layout.activity_main) {

    @Inject
    lateinit var viewModel: MainActivityViewModel

    private var isInitialised: Boolean = false

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

sphrak

class MainActivity : AppCompatActivity(R.layout.activity_main) {

    @Inject
    lateinit var viewModel: MainActivityViewModel

    @Inject
    lateinit eventChannel: ConflatedBroadcastChannel<MainActivityView.Event>

    private var isInitialised: Boolean = false

sphrak

Kotlin Snippets

A tiny collection of Kotlin snippets that I find useful.

Measure Execution time

Keep in mind this is not an end all be all measurement since the jvm has indeterministic garbage collection but it can give you a general idea of whats taking time.

With return value

sphrak

#!/bin/bash

# Usage
# chmod +x semverdiff.sh
# Get diff between 1.0.0..1.0.1
# ./semverdiff 1.0.1 

get_diff() {
    sed -n "/^## \[$1\]/,/^## /p" CHANGELOG.md | egrep "^(-|\s+)"
}

sphrak

import android.support.annotation.StringDef
import android.text.Editable
import android.text.TextWatcher
import android.widget.EditText

@StringDef(PHONE_9_MASK, PHONE_8_MASK, CPF_MASK, ZIP_CODE_PT_BR, MONTH_YEAR, CREDIT_CARD)
@Retention(AnnotationRetention.SOURCE)
annotation class MaskType

const val PHONE_9_MASK = "(##) #####-####"

sphrak

acpi
acpid
alsa-firmware
alsa-utils
android-studio
android-studio-beta
android-studio-canary
android-tools
atop
audacity