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Best practice for instantiating a new Android Fragment
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Some kotlin code:
companion object {
fun newInstance(first: String, second: String) : SampleFragment {
return SampleFragment().apply {
arguments = Bundle().apply {
putString("firstString", ...
Start an Activity with a parameter
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Kotlin code:
Start the SecondActivity:
startActivity(Intent(context, SecondActivity::class.java)
.putExtra(SecondActivity.PARAM_GAME_ID, gameId))
Get the Id in SecondActivity:
class CaptureActivity : AppCompatActivit...
Java Generics Wildcarding With Multiple Classes
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Here's how you would do it in Kotlin
fun <T> myMethod(item: T) where T : ClassA, T : InterfaceB {
//your code here
}
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Java Synchronized Block for .class
... was wondering about this question for couple days for myself (actually in kotlin). I finally found good explanation and want to share it:
Class level lock prevents multiple threads to enter in synchronized block in any of all available instances of the class on runtime. This means if in runtime the...
重构理论及实践——用工厂模式重构c++后台代码 - C/C++ - 清泛网 - 专注C/C...
...要测试同学干嘛？”有过这种想法的自觉举手~
提高编程速度：好的代码才更容易扩展功能，烂的代码，你想加个功能都加不进去，告诉我不是一个人有这种经历。。。
重构的时机？
三次法则、添加功能时、修补错...
Why do I want to avoid non-default constructors in fragments?
... is not implicitly generated when overload present.
In my projects I use Kotlin, and implement fragments with a primary no-arg constructor and secondary constructor for arguments which just stores them into a bundle and sets it as Fragment arguments, everything works fine.
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How to programmatically set the layout_align_parent_right attribute of a Button in Relative Layout?
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Kotlin version:
Use these extensions with infix functions that simplify later calls
infix fun View.below(view: View) {
(this.layoutParams as? RelativeLayout.LayoutParams)?.addRule(RelativeLayout.BELOW, view.id)
}
infix...
How to deserialize a list using GSON or another JSON library in Java?
...List = Arrays.asList(videoArray);
IMHO this is much more readable.
In Kotlin this looks like this:
Gson().fromJson(jsonString, Array<Video>::class.java)
To convert this array into List, just use .toList() method
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support FragmentPagerAdapter holds reference to old fragments
... Very precise. Solved my problem without using hacks. Thanks! My Kotlin version turned from FragmentStatePagerAdapter(activity!!.supportFragmentManager) to an easier to look at FragmentStatePagerAdapter(childFragmentManager) :)
– ecth
Sep 6 '19 at 7:0...
format statement in a string resource file
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For me it worked like that in Kotlin:
my string.xml
<string name="price" formatted="false">Price:U$ %.2f%n</string>
my class.kt
var formatPrice: CharSequence? = null
var unitPrice = 9990
formatPrice = String.format(context.getString(R.str...