Question

我正在为我的 android 电视盒创建一个简单的应用程序，它使用 webview 对象来显示一些流网址，并使用遥控器（硬件键盘）的 PGup 和 PGdown 在它们之间进行选择。

我正在重写 onKeyUp 方法，但不幸的是我的应用程序似乎没有检测到任何按键操作。这是一些代码摘录：

package com.dm.tutorialwebview

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.view.KeyEvent
import android.view.Menu
import android.webkit.WebChromeClient
import android.webkit.WebView
import android.webkit.WebViewClient
import android.util.Log
import android.view.MotionEvent


class MainActivity : AppCompatActivity() {

    var webview: WebView? = null
    data class Channel(val number: Int, val name:String, val url: String )

    object ChannelList {
        private val list = mutableListOf<Channel>()
        private var curChannel: Int = 0
[..]
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        ChannelList.addItem(Channel(1,"channel1","https://...3"))
        ChannelList.addItem(Channel(2,"channel2","https://..."))
        ChannelList.addItem(Channel(3,"channel3","https://..."))

        webview = findViewById(R.id.myweb)
        webview!!.webViewClient = WebViewClient()
        webview!!.settings.javaScriptEnabled = false
        webview!!.webChromeClient = WebChromeClient()
        webview!!.settings.domStorageEnabled = true
        webview!!.settings.builtInZoomControls = false     
        webview!!.settings.setSupportZoom(false)           
        webview!!.overScrollMode = WebView.OVER_SCROLL_NEVER
        webview!!.settings.useWideViewPort = true
        webview!!.setInitialScale(1)

        webview!!.loadUrl(ChannelList.getChannelUrl())

    }

    override fun onKeyUp(keyCode: Int, event: KeyEvent): Boolean {
        Log.i("TAG", "onKeyUp is been called");
        return when (keyCode) {
            KeyEvent.KEYCODE_PAGE_UP -> {
                ChannelList.nextChannel()
                webview!!.loadUrl(ChannelList.getChannelUrl())
                true
            }
            KeyEvent.KEYCODE_PAGE_DOWN -> {
                ChannelList.prevChannel()
                webview!!.loadUrl(ChannelList.getChannelUrl())
                true
            }
            KeyEvent.KEYCODE_1 -> {
                ChannelList.setChannel(1)
                webview!!.loadUrl(ChannelList.getChannelUrl())
                true
            }
            else -> super.onKeyUp(keyCode, event)
        }

    }


}

方法 onKeyUp 似乎根本没有被触发。关于此代码可能有什么问题的任何提示？

感谢和问候

Answer 1

谢谢@Ashwini-violet，我用dispathKeyEvent 替换了onKeyUp。

我使用了一种变通方法将输入限制为每 250 毫秒一次；不是很礼貌，但它起作用了。

-using COUNTIFS
-Having the range include A ("A$4:B30")
-Having the criteria contain both sides (B$4:B30&">"&A$4:A30)
-Not using quotes
-I tried using ARRAYFORMULA and that gave me a mess. But I'm also not that great with ARRAYFORMULA so I might be doing something wrong.

无法在 Android 应用程序 (Kotlin) 上使用硬件键盘检测按键

1 个答案: