ContextExtensions.md

ContextExtensions.kt

/**
* Checks network connectivity
*/
@RequiresPermission(Manifest.permission.ACCESS_NETWORK_STATE)
fun Context.isNetworkStatusAvailable(): Boolean {
   val connectivityManager = this
       .getSystemService(Context.CONNECTIVITY_SERVICE) as? ConnectivityManager
   connectivityManager?.let {
       val netInfo = it.activeNetworkInfo
       netInfo?.let {
           if (netInfo.isConnected) return true
       }
   }
   return false
} 

, /**
* Execute block of code if network is available
*/
@RequiresPermission(Manifest.permission.ACCESS_NETWORK_STATE)
inline fun Context.withNetwork(block: () -> Unit) {
   if (isNetworkStatusAvailable()) {
       block()
   }
} 

, /**
* Loads content of file from assets as String using UTF-8 charset
*/
fun Context.loadFromAsset(jsonName: String): String? {
   var stream: String? = null
   try {
       val inputStream = this.assets.open(jsonName)
       val size = inputStream.available()
       val buffer = ByteArray(size)
       inputStream.read(buffer)
       inputStream.close()
       stream = String(buffer, Charset.forName("UTF-8"))
   } catch (e: IOException) {
   }
   return stream
} 

, /**
* Computes status bar height
*/
fun Context.getStatusBarHeight(): Int {
   var result = 0
   val resourceId = this.resources.getIdentifier(
       "status_bar_height", "dimen",
       "android"
   )
   if (resourceId > 0) {
       result = this.resources.getDimensionPixelSize(resourceId)
   }
   return result
} 

, /**
* Computes screen height
*/
fun Context.getScreenHeight(): Int {
   var screenHeight = 0
   val wm = this.getSystemService(Context.WINDOW_SERVICE) as? WindowManager
   wm?.let {
       val metrics = DisplayMetrics()
       wm.defaultDisplay.getMetrics(metrics)
       screenHeight = metrics.heightPixels
   }
   return screenHeight
} 

, /**
* Convert dp integer to pixel
*/
fun Context.toPx(dp: Int): Float {
   val displayMetrics = this.resources.displayMetrics
   return (dp * (displayMetrics.xdpi / DisplayMetrics.DENSITY_DEFAULT))
} 

, /**
* Get color from resources
*/
fun Context.getCompatColor(@ColorRes colorInt: Int): Int =
   ContextCompat.getColor(this, colorInt) 

, /**
* Get drawable from resources
*/
fun Context.getCompatDrawable(@DrawableRes drawableRes: Int): Drawable? =
   ContextCompat.getDrawable(this, drawableRes)