Some Kotlin Code For Android

Android
1

Click to see Source Code kotlinx-android

==============

kotlinx-widget

AbsSwipeRefreshLayout<ProgressView, RemindView>:

rewite SwipeRefreshLayout :
1. support pull down to refresh and enable to custom pull refresh anim: 支持下拉刷新自定义刷新动画
2. support show remind pop view after pull refresh: 支持刷新完成后弹窗提醒

LoadMoreRecyclerAdapter<VHData : RecyclerView.ViewHolder, Data, VHFooter>:

custom RecyclerView.Adapter :
1. support pull up load more: 支持上拉加载更多

kotlinx-common

ActivityExt:

Activity.contentView
1. return the content view set by [Activity.setContentView]

  
Activity.startActivityForResult<MyActivity>(requestCode, bundle)

// same with below

Activity.startActivityForResult(Intent(context, MyActivity::class.java), requestCode, bundle)


  
Activity.startActivityForResult<MyActivity>(requestCode, bundle){
    action = "com.action.xxx"
    putExtra("key", "value")
}

// same with below

val intent = Intent(context, MyActivity::class.java).apply{
    action = "com.action.xxx"
    putExtra("key", "value")
}
Activity.startActivityForResult(intent, requestCode, bundle)

AndroidExt:

    
    /** Do something depending on android sdk, for <b>compatibility</b> */
    /** 判断安卓SDK版本后 执行代码,  <b>兼容性</b> */
    
    ifSdk(16, 19, 29) {
        //do something if Build.VERSION.SDK_INT is one of 16, 19, 29
    } other {
        //otherwise, do other thing
    }
        
    ifNotSdk(16, 19, 29) {
        //do something if Build.VERSION.SDK_INT is not 16, 19 or 29
    } other {
        //otherwise, do other thing
    }
    
    fromSdk(16) {
        //do something if Build.VERSION.SDK_INT >= 16
    } other {
        //otherwise, Build.VERSION.SDK_INT < 16, do other thing
    }
    
    toSdk(16) {
        //do something if Build.VERSION.SDK_INT <= 16
    } other {
        //otherwise, Build.VERSION.SDK_INT > 16, do other thing
    }

    afterSdk(16) {
        //do something if Build.VERSION.SDK_INT > 16
    } other {
        //otherwise, Build.VERSION.SDK_INT <= 16, do other thing
    }

    untilSdk(16) {
        //do something if Build.VERSION.SDK_INT < 16
    } other {
        //otherwise, Build.VERSION.SDK_INT >= 16, do other thing
    }

BitmapExt:

Bitmap?.createRoundedCornerBitmap
1. create a new rounded corner bitmap, basing on the current bitmap: 基于当前 Bitmap 创建一个带圆角的 Bitmap

ContextExt:

Context?.toastShort(msg)    
Context?.toastShort(resId)   
Context?.toastLong(msg)    
Context?.toastLong(resId) 

Context.dpToPx(dp)
1. cast the [dp] dip into px unit

Context.pxToDp(px)
1. cast the [px] px into dip unit

Context.screenWidth()
1. get the screen width pixels ,
same as [Context.getResources].[getDisplayMetrics].[widthPixels]

Context.screenWidthShort()
1. return the smaller between [screenWidth] and [screenHeight]

Context.screenWidthX()
1. return the [screenWidthShort] if current is orientation portrait, otherwise the [screenHeightLong]

Context.screenHeight()
1. get the screen height pixels ,
same as [Context.getResources].[getDisplayMetrics].[heightPixels]

Context.screenHeightLong()
1. return the larger between [screenWidth] and [screenHeight]

Context.screenHeightY()
1. return the [screenHeightLong] if current is orientation portrait, otherwise the [screenWidthShort]

  
Context.startActivity<MyActivity>()

// same with below

Context.startActivity(Intent(context, MyActivity::class.java))


  
Context.startActivity<MyActivity>{
    action = "com.action.xxx"
    putExtra("key", "value")
}

// same with below

val intent = Intent(context, MyActivity::class.java).apply{
    action = "com.action.xxx"
    putExtra("key", "value")
}
Context.startActivity(intent)

HandlerExt:

  
Handler.postDelayed(delay){
    // do something
}

NoLeakListenerFunction1:

wrap the Listener implementing interface , which only has one callback method, **Avoid Memory Leak !!!** 
包装 只实现 有一个单独方法的接口 的监听器， 并返回代理对象， ***避免内存泄漏 !!!***

TextViewExt:

TextView.addEllipsis:
1. add "…" after the end of text: 在 TextView 显示的文本末尾添加省略号( … )

ThreadExt:

object UiThreadHandler
isMainThread()

  
runOnNewThread { 
    // do something in a new thread
}

// same with below

Thread{
    // do something in a new thread
}.start()


  
postOnNewThread(1000) { 
    // do something in a new thread after 1000 milliseconds
}

// same with below

val handler = Handler(HandlerThread("HandlerThread-${nextThreadNum()}").apply { start() }.looper)
handler.postDelayed(1000) {
    try {
        // do something in a new thread after 1000 milliseconds
    } catch (ignored: Exception) {
    } finally {
        (Thread.currentThread() as? HandlerThread)?.let { thread ->

            fromSdk(18) {
                thread.quitSafely()
            } other {
                thread.quit()
            }

        }
    }
}


  
postOnCurrentThread(1000) { 
    // do something in current thread after 1000 milliseconds
}

// same with below

Handler().postDelayed(1000) {
    // do something in current thread after 1000 milliseconds
}


  
runOnUiThread(target) { 
    // do something in ui thread, 
    // and try to associate with the lifecycle for target , when target is not null
}

postOnUiThread(target, 1000){
    // do something in ui thread after 1000 milliseconds, 
    // and try to associate with the lifecycle for target , when target is not null
}


Runnable.runOnUiThread(target)
1. immediately run the task, if current is on UI thread
2. otherwise, to post the task into run queue, or maybe a ui thread handler

Runnable.postOnUiThread(target, delay)
1. post the task into run queue, or maybe a ui thread handler;
and the task will be to run after [delay] milliseconds ,
even if the [delay] is less than 0, it is still waiting the run queue to call running

ViewExt:

View.layoutLeftMargin: 
1. return the leftMargin of the layoutParams for the current View, if exists , otherwise return null
2. set the leftMargin of the layoutParams for the current View, and reset the layoutParams

View.layoutRightMargin: 
1. return the rightMargin of the layoutParams for the current View, if exists , otherwise return null
2. set the rightMargin of the layoutParams for the current View, and reset the layoutParams

View.layoutTopMargin: 
1. return the topMargin of the layoutParams for the current View, if exists , otherwise return null
2. set the topMargin of the layoutParams for the current View, and reset the layoutParams

View.layoutBottomMargin: 
1. return the bottomMargin of the layoutParams for the current View, if exists , otherwise return null
2. set the bottomMargin of the layoutParams for the current View, and reset the layoutParams

View.layoutWidth: 
1. return the width of the layoutParams for the current View, if exists , otherwise return null
2. set the width of the layoutParams for the current View, and reset the layoutParams

View.layoutHeight: 
1. return the height of the layoutParams for the current View, if exists , otherwise return null
2. set the height of the layoutParams for the current View, and reset the layoutParams

  
View.postDelayed(delay){
    // do something
}

ViewGroupExt:

ViewGroup.views
1. the list of child view

ViewGroup.firstView
1. the first child view

ViewGroup.lastView
1. the last child view