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xujiaji/KeyboardTool.kt

Last active May 16, 2019 03:12
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android 键盘监听工具 kotlin
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KeyboardTool.kt
import android.app.Activity
import android.graphics.Rect
import android.view.View
import android.view.ViewGroup
import android.view.ViewTreeObserver
import android.app.Application
import android.os.Bundle
object KeyboardTool {
private const val KEYBOARD_MIN_RATIO = 0.15
fun registerEvent(activity: Activity, listener: OnKeyboardListener) {
val rootView = getActivityRoot(activity)
val globalListener = object : ViewTreeObserver.OnGlobalLayoutListener {
private val r = Rect()
private var isOpened = false
override fun onGlobalLayout() {
rootView.getWindowVisibleDisplayFrame(r)
val screenHeight = rootView.rootView.height
val heightDiff = screenHeight - r.height()
val isOpen = heightDiff > screenHeight * KEYBOARD_MIN_RATIO
if (isOpen == isOpened) {
return
}
isOpened = isOpen
listener.onVisibleChange(isOpen)
}
}
rootView.viewTreeObserver.addOnGlobalLayoutListener(globalListener)
activity.application.registerActivityLifecycleCallbacks(object : ActivityDestroyCycleCallback(activity) {
override fun onDestroyCycle() {
rootView.viewTreeObserver.removeOnGlobalLayoutListener(globalListener)
}
})
}
private fun getActivityRoot(activity: Activity): View = activity.findViewById<ViewGroup>(android.R.id.content).getChildAt(0)
interface OnKeyboardListener {
fun onVisibleChange(isOpen: Boolean)
}
}
abstract class ActivityDestroyCycleCallback(private val mTargetActivity: Activity): Application.ActivityLifecycleCallbacks {
override fun onActivityPaused(activity: Activity?) {}
override fun onActivityResumed(activity: Activity?) {}
override fun onActivityStarted(activity: Activity?) {}
override fun onActivityDestroyed(activity: Activity?) {
if (activity == mTargetActivity) {
mTargetActivity.application.unregisterActivityLifecycleCallbacks(this)
onDestroyCycle()
}
}
override fun onActivitySaveInstanceState(activity: Activity?, outState: Bundle?) {}
override fun onActivityStopped(activity: Activity?) {}
override fun onActivityCreated(activity: Activity?, savedInstanceState: Bundle?) {}
protected abstract fun onDestroyCycle()
}
@xujiaji
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xujiaji commented May 16, 2019

使用案例：

        KeyboardTool.registerEvent(this, object : KeyboardTool.OnKeyboardListener {
            override fun onVisibleChange(isOpen: Boolean) {
                contentShowView
                        .animate()
                        .apply {
                            translationY(if (isOpen) -UISizeTool.dip2px(this@RegisterActivity, 128.0F).toFloat() else 0F)
                            duration = 500
                            interpolator = AccelerateDecelerateInterpolator()
                            start()
                        }
            }
        })

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