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@tpb1908
Created July 3, 2017 19:41
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Useful Android Kotlin extension functions
package com.tpb.brainfuck
import android.support.design.widget.FloatingActionButton
import android.support.v7.widget.RecyclerView
import android.text.Editable
import android.text.TextWatcher
import android.util.Log
import android.widget.TextView
/**
* Created by theo on 01/07/17.
*/
/**
* Adds an [RecyclerView.OnScrollListener] to show or hide the FloatingActionButton when the RecyclerView scrolls up
* or down respectively
*/
fun RecyclerView.bindFloatingActionButton(fab: FloatingActionButton) = this.addOnScrollListener(object : RecyclerView.OnScrollListener() {
override fun onScrolled(recyclerView: RecyclerView?, dx: Int, dy: Int) {
super.onScrolled(recyclerView, dx, dy)
if (dy > 0 && fab.isShown) {
fab.hide()
} else if (dy < 0 && !fab.isShown) {
fab.show()
}
}
})
/**
* Calls the given function on [TextWatcher.afterTextChanged]
*/
fun TextView.addSimpleTextChangedListener(listener: (e : Editable) -> Unit) = this.addTextChangedListener(object: TextWatcher {
override fun afterTextChanged(p0: Editable) {
listener(p0)
}
override fun beforeTextChanged(p0: CharSequence, p1: Int, p2: Int, p3: Int) {
}
override fun onTextChanged(p0: CharSequence, p1: Int, p2: Int, p3: Int) {
}
})
fun String.occurrencesOf(sub: String): Int {
var count = 0
var last = 0
while (last != -1) {
last = this.indexOf(sub, last)
if (last != -1) {
count++
last += sub.length
}
}
return count
}
fun String.occurrencesOf(ch: Char): Int = this.count { it == ch }
//Utilities for logging functions. Using class simple name as tag
fun Any.debug(message: String) {
Log.d(this::class.java.simpleName, message)
}
fun Any.debug(message: String, tr: Throwable) {
Log.d(this::class.java.simpleName, message, tr)
}
fun Any.error(message: String) {
Log.e(this::class.java.simpleName, message)
}
fun Any.error(message: String, tr: Throwable) {
Log.e(this::class.java.simpleName, message, tr)
}
fun Any.info(message: String) {
Log.i(this::class.java.simpleName, message)
}
fun Any.info(message: String, tr: Throwable) {
Log.i(this::class.java.simpleName, message, tr)
}
fun Any.verbose(message: String) {
Log.v(this::class.java.simpleName, message)
}
fun Any.verbose(message: String, tr: Throwable) {
Log.v(this::class.java.simpleName, message, tr)
}
fun Any.warn(message: String) {
Log.w(this::class.java.simpleName, message)
}
fun Any.warn(message: String, tr: Throwable) {
Log.w(this::class.java.simpleName, message, tr)
}
fun Any.warn(tr: Throwable) {
Log.w(this::class.java.simpleName, tr)
}
fun Any.wtf(message: String) {
Log.wtf(this::class.java.simpleName, message)
}
fun Any.wtf(message: String, tr: Throwable) {
Log.wtf(this::class.java.simpleName, message, tr)
}
fun Any.wtf(tr: Throwable) {
Log.wtf(this::class.java.simpleName, tr)
}
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