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Frequently used Kotlin extensions for Android
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| ```kotlin | |
| /** | |
| * property extension | |
| */ | |
| var View.isVisible: Boolean | |
| get() = visibility == View.VISIBLE | |
| set(value) { | |
| val v = if (value) View.VISIBLE else View.GONE | |
| if (visibility != v) { | |
| visibility = v | |
| } | |
| } | |
| // dp -> px | |
| val Number.toPx | |
| get() = TypedValue.applyDimension( | |
| TypedValue.COMPLEX_UNIT_DIP, | |
| this.toFloat(), | |
| Resources.getSystem().displayMetrics | |
| ) | |
| /** | |
| * method extension | |
| */ | |
| fun Any?.isNull() = this == null | |
| inline fun View.showIf(condition: () -> Boolean): View { | |
| if (condition.invoke()) { | |
| isVisible = true | |
| } | |
| return this | |
| } | |
| fun View.hide(): View { | |
| visibility = View.GONE | |
| return this | |
| } | |
| inline fun View.hideIf(condition: () -> Boolean): View { | |
| if (condition.invoke()) { | |
| visibility = View.GONE | |
| } | |
| return this | |
| } | |
| fun View.setPaddingLeft(value: Int) = setPadding(value, paddingTop, paddingRight, paddingBottom) | |
| fun View.setPaddingRight(value: Int) = setPadding(paddingLeft, paddingTop, value, paddingBottom) | |
| fun View.setPaddingTop(value: Int) = setPadding(paddingLeft, value, paddingRight, paddingBottom) | |
| fun View.setPaddingBottom(value: Int) = setPadding(paddingLeft, paddingTop, paddingRight, value) | |
| fun TextView.setDrawableLeft(value: Drawable?) = setCompoundDrawables(value, null, null, null) | |
| ``` |
Author
mmlovesyy
commented
Nov 18, 2021
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