一、Context
1、获取颜色
fun Context.getColorCompat(color: Int) = ContextCompat.getColor(this, color)
2、获取屏幕宽/高（px）
val Context.screenWidthPx: Int
get() = resources.displayMetrics.widthPixels
val Context.screenHeightPx: Int
get() = resources.displayMetrics.heightPixels
3、获取屏幕宽/高（dp）
val View.screenWidthDp: Int
get() = screenWidthPx.px2dp()
val View.screenHeightDp: Int
get() = screenHeightPx.px2dp()
4、inflater
val Context.inflater: LayoutInflater
get() = LayoutInflater.from(this)
fun Context.inflateLayout(@LayoutRes layoutId: Int, parent: ViewGroup? = null, attachToRoot: Boolean = false) = inflater.inflate(layoutId, parent, attachToRoot)
5、startActivity/startService
fun <reified T : Activity> Context?.startActivity() = this?.startActivity(Intent(this, T::class.java))
fun <reified T : Service> Context?.startService() = this?.startService(Intent(this, T::class.java))
7、startActivityWithAnimation
inline fun <reified T : Activity> Context.startActivityWithAnimation(enterResId: Int = 0, exitResId: Int = 0) {
val intent = Intent(this, T::class.java)
val bundle = ActivityOptionsCompat.makeCustomAnimation(this, enterResId, exitResId).toBundle()
ContextCompat.startActivity(this, intent, bundle)
}
inline fun <reified T : Activity> Context.startActivityWithAnimation(enterResId: Int = 0, exitResId: Int = 0, intentBody: Intent.() -> Unit) {
val intent = Intent(this, T::class.java)
intent.intentBody()
val bundle = ActivityOptionsCompat.makeCustomAnimation(this, enterResId, exitResId).toBundle()
ContextCompat.startActivity(this, intent, bundle)
}
6、toast
fun Context?.toast(text: CharSequence, duration: Int = Toast.LENGTH_LONG) = this?.let { Toast.makeText(it, text, duration).show() }
fun Context?.toast(@StringRes textId: Int, duration: Int = Toast.LENGTH_LONG) = this?.let { Toast.makeText(it, textId, duration).show() }
7、获取资源
fun Context.getCompatColor(@ColorRes id: Int) = ContextCompat.getColor(this, id)
fun Context.getCompatDrawable(@DrawableRes id: Int) = ContextCompat.getDrawable(this, id)
fun Context.getInteger(@IntegerRes id: Int) = resources.getInteger(id)
fun Context.getBoolean(@BoolRes id: Int) = resources.getBoolean(id)
8、获取各种系统Manager
val Context.inputManager: InputMethodManager?
get() = getSystemService(INPUT_METHOD_SERVICE) as? InputMethodManager
val Context.notificationManager: NotificationManager?
get() = getSystemService(NOTIFICATION_SERVICE) as? NotificationManager
val Context.keyguardManager: KeyguardManager?
get() = getSystemService(KEYGUARD_SERVICE) as? KeyguardManager
9、跳转到拨号界面
fun Context.makeCall(number: String): Boolean {
try {
val intent = Intent(ACTION_CALL, Uri.parse("tel:$number"))
startActivity(intent)
return true
} catch (e: Exception) {
return false
}
}
10、是否开启通知
fun Context.isNotificationOpen():Boolean{
var isOpened: Boolean
try {
isOpened = NotificationManagerCompat.from(this).areNotificationsEnabled()
} catch (e: Exception) {
e.printStackTrace()
isOpened = false
}
return isOpened
}
二、Activity
1、隐藏键盘
fun Activity.hideSoftKeyboard(focusView: View? = null) {
val focusV = focusView ?: currentFocus
focusV?.apply {
val inputMethodManager = getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
inputMethodManager.hideSoftInputFromWindow(windowToken, 0)
}
}
2、弹起键盘
fun Activity.showSoftKeyboard(editText: EditText) {
editText.postDelayed({
editText.requestFocus()
val inputMethodManager = getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
inputMethodManager.showSoftInput(editText, InputMethodManager.SHOW_FORCED)
}, 30)
}
3、获取ContentView
fun Activity.getContentView(): ViewGroup {
return this.findViewById(android.R.id.content) as ViewGroup
}
4、设备Window背景
fun AppCompatActivity.setWindowBackGround(@ColorRes colorRes: Int) {
window.getDecorView().setBackgroundResource(colorRes)
}
5、添加fragment到Activity
fun AppCompatActivity.addFragmentToActivity(fragment: Fragment, tag: String) {
supportFragmentManager.transact {
add(fragment, tag)
}
}
三、Fragment
1、Toast
fun Fragment?.toast(text: CharSequence, duration: Int = Toast.LENGTH_LONG) = this?.let { activity.toast(text, duration) }
fun Fragment?.toast(@StringRes textId: Int, duration: Int = Toast.LENGTH_LONG) = this?.let { activity.toast(textId, duration) }
2、键盘弹起/隐藏
fun Fragment.hideSoftKeyboard() {
activity?.hideSoftKeyboard()
}
fun DialogFragment.hideSoftKeyboard() {
val dialog = getDialog()
activity?.hideSoftKeyboard(dialog?.currentFocus)
}
3、commit
inline fun FragmentManager.transact(action: FragmentTransaction.() -> Unit) {
beginTransaction().apply { action() }.commit()
}
四、View
1、设置padding
fun View.updatePadding(
paddingStart: Int = getPaddingStart(),
paddingTop: Int = getPaddingTop(),
paddingEnd: Int = getPaddingEnd(),
paddingBottom: Int = getPaddingBottom()
) {
setPaddingRelative(paddingStart, paddingTop, paddingEnd, paddingBottom)
}
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) = setPaddingRelative(paddingStart, value, paddingEnd, paddingBottom)
fun View.setPaddingBottom(value: Int) = setPaddingRelative(paddingStart, paddingTop, paddingEnd, value)
2、改变大小
fun View.resize(width: Int, height: Int) {
if (width < 0 || height < 0) return
val lp = layoutParams
lp?.let {
lp.width = width
lp.height = height
layoutParams = lp
}
}
fun View.updateHeight(value: Int) {
if (value < 0) return
val lp = layoutParams
lp?.let {
lp.height = value
layoutParams = lp
}
}
fun View.updateWidth(value: Int) {
if (value < 0) return
val lp = layoutParams
lp?.let {
lp.width = value
layoutParams = lp
}
}
3、获取子View集合
val ViewGroup.children: List<View>
get() = (0 until childCount).map { getChildAt(it) }
4、点击
fun <T : View> T.click(block: (T) -> Unit) = setOnClickListener { block(it as T) }
fun <T : View> T.singleClick(block: (T) -> Unit) = setOnClickListener(object : SingleClickListener() {
override fun onSingleClick(v: View) {
block(v as T)
}
})
fun <T : View> T.longClick(block: (T) -> Boolean) = setOnLongClickListener {
block(it as T)
}
5、把当前View生成Bitmap
fun View.getBitmap(): Bitmap {
val bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888)
val canvas = Canvas(bmp)
draw(canvas)
canvas.save()
return bmp
}
6、获取在屏幕上的坐标
fun View.getLOnScreen(): IntArray {
val locations = IntArray(2)
getLocationOnScreen(locations)
return locations
}
fun View.getLocationXOnScreen(): Int {
return getLOnScreen()[0]
}
fun View.getLocationYOnScreen(): Int {
return getLOnScreen()[1]
}
7、获取在窗口上的坐标
fun View.getLInWindow(): IntArray {
val locations = IntArray(2)
getLocationInWindow(locations)
return locations
}
fun View.getLocationXInWindow(): Int {
return getLInWindow()[0]
}
fun View.getLocationYInWindow(): Int {
return getLInWindow()[1]
}
五、TextView
1、设置颜色
fun TextView.setTColor(@ColorRes colorId: Int) = setTextColor(context.getCompatColor(colorId))
2、设置部分文本字体颜色高亮
fun TextView.setColorOfSubstring(substring: String, color: Int) {
try {
val spannable = android.text.SpannableString(text)
val start = text.indexOf(substring)
spannable.setSpan(ForegroundColorSpan(ContextCompat.getColor(context, color)), start, start + substring.length, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
text = spannable
} catch (e: Exception) {
Log.d("ViewExtensions", "exception in setColorOfSubstring, text=$text, substring=$substring", e)
}
}
3、设置Drawable
fun TextView.setDrawableLeft(drawable: Int) {
this.setCompoundDrawablesWithIntrinsicBounds(drawable, 0, 0, 0)
}
fun TextView.setDrawableTop(drawable: Int) {
this.setCompoundDrawablesWithIntrinsicBounds(0, drawable, 0, 0)
}
fun TextView.setDrawableRight(drawable: Int) {
this.setCompoundDrawablesWithIntrinsicBounds(0, 0, drawable, 0)
}
fun TextView.setDrawableBottom(drawable: Int) {
this.setCompoundDrawablesWithIntrinsicBounds(0, 0, 0，drawable)
}
4、简写addTextChangedListener
private val beforeTextChangedDefault: (s: CharSequence?, start: Int, before: Int, count: Int) -> Unit = { _,_, _, _ -> }
private val onTextChangedDefault: (s: CharSequence?, start: Int, before: Int, count: Int) -> Unit = { _, _, _, _ -> }
private val afterTextChangedDefault: (s: Editable?) -> Unit = {}
fun TextView.addTextChangedListener(
beforeTextChanged: (s: CharSequence?, start: Int, before: Int, count: Int) -> Unit = beforeTextChangedDefault,
onTextChanged: (s: CharSequence?, start: Int, before: Int, count: Int) -> Unit = onTextChangedDefault,
afterTextChanged: (s: Editable?) -> Unit = afterTextChangedDefault
) =
this.addTextChangedListener(object : TextWatcher {
override fun afterTextChanged(s: Editable?) {
afterTextChanged.invoke(s)
}
override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
beforeTextChanged.invoke(s, start, count, after)
}
override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
onTextChanged.invoke(s, start, before, count)
}
})
六、ViewPager
1、简写addOnPageChangeListener
fun ViewPager.addSubscribePageChange(observable: ViewPageChangeObservable.() -> Unit) {
observable.invoke(ViewPageChangeObservable(this))
}
class ViewPageChangeObservable(viewPager: ViewPager) {
private var mPageChanged: ((state: Int) -> Unit)? = null
private var mPageScrolled: ((position: Int, positionOffset: Float, positionOffsetPixels: Int) -> Unit)? = null
private var mPageSelected: ((position: Int) -> Unit)? = null
fun onPageScrollStateChanged(pageChanged: (Int) -> Unit) {
mPageChanged = pageChanged
}
fun onPageScrolled(pageScrolled: (Int, Float, Int) -> Unit) {
mPageScrolled = pageScrolled
}
fun onPageSelected(pageSelected: (Int) -> Unit) {
mPageSelected = pageSelected
}
init {
viewPager.addOnPageChangeListener(object : ViewPager.OnPageChangeListener {
override fun onPageScrollStateChanged(state: Int) {
mPageChanged?.invoke(state)
}
override fun onPageScrolled(position: Int, positionOffset: Float, positionOffsetPixels: Int) {
mPageScrolled?.invoke(position, positionOffset, positionOffsetPixels)
}
override fun onPageSelected(position: Int) {
mPageSelected?.invoke(position)
}
})
}
}
七、ViewListenerExtension
1、OnClickListener
fun View.OnClickListener.setViews(vararg views: View) {
for (view in views) {
view.setOnClickListener(this)
}
}
2、单击
fun SingleClickListener.setViews(vararg views: View) {
for (view in views) {
view.setOnClickListener(this)
}
}
abstract class SingleClickListener : View.OnClickListener {
companion object {
const val MIN_CLICK_DELAY_TIME = 500
}
private var lastClickTime: Long = 0L
override fun onClick(v: View) {
val currentTime = Calendar.getInstance().getTimeInMillis()
if (currentTime - lastClickTime > MIN_CLICK_DELAY_TIME) {
lastClickTime = currentTime;
onSingleClick(v);
}
}
abstract fun onSingleClick(v: View)
}
3、CheckedChangeListener
fun CompoundButton.OnCheckedChangeListener.setViews(vararg views: CompoundButton) {
for (view in views) {
view.setOnCheckedChangeListener(this)
}
}
八、NumberExtension
fun Float.dp2px() = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, this, Resources.getSystem().displayMetrics)
fun Int.dp2px() = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, this.toFloat(), Resources.getSystem().displayMetrics).toInt()
fun Int.px2dp(): Int {
val scale = BaseApplication.getAppContext().resources.displayMetrics.density
return (this / scale + 0.5f).toInt()
}
九、BooleanExtension
**
* 实现： Boolean.yes{}.otherwise{}
*/
sealed class BooleanExt1<out T>
object Otherwise : BooleanExt1<Nothing>()
class TransferData1<T>(val data: T) : BooleanExt1<T>()
inline fun <T> Boolean.yes(block: () -> T): BooleanExt1<T> = when {
this -> {
TransferData1(block.invoke())
}
else -> Otherwise
}
inline fun <T> BooleanExt1<T>.otherwise(block: () -> T): T = when (this) {
is Otherwise ->
block()
is TransferData1 ->
this.data
}
sealed class BooleanExt2<out T>
object Yes : BooleanExt2<Nothing>()
class TransferData2<T>(val data: T) : BooleanExt2<T>()
inline fun <T> Boolean.otherwise(block: () -> T): BooleanExt2<T> = when {
!this -> {
TransferData2(block.invoke())
}
else -> Yes
}
inline fun <T> BooleanExt2<T>.yes(block: () -> T): T = when (this) {
is Yes ->
block()
is TransferData2 ->
this.data
}
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