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MainActivity.kt
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MainActivity.kt
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package dk.gomore.jseventcapture
import android.annotation.SuppressLint
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.webkit.JavascriptInterface
import android.webkit.WebChromeClient
import android.webkit.WebView
import android.webkit.WebViewClient
import android.widget.Toast
import kotlinx.android.synthetic.main.activity_main.*
class MainActivity : AppCompatActivity() {
private val data = """
<button type='button' id='someButton'>Click me</button>
"""
val injectedFunction = """
javascript:(function() {
window.someButton.onclick = function() {
alert('Button Clicked');
androidButton.onCapturedButtonClicked();
}
})()
"""
private val webViewClient = object : WebViewClient() {
override fun onPageFinished(view: WebView?, url: String?) {
super.onPageFinished(view, url)
view?.let {
it.loadUrl(injectedFunction)
}
}
}
@SuppressLint("JavascriptInterface")
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
webView.settings.javaScriptEnabled = true
webView.webChromeClient = WebChromeClient()
webView.webViewClient = webViewClient
webView.addJavascriptInterface(CaptureClickJavascriptInterface(), "androidButton")
webView.loadData(data, "text/html", "UTF-8")
}
private fun showClickMessage() {
Toast.makeText(
this@MainActivity,
"[Android] JavaScript button was clicked",
Toast.LENGTH_LONG
).show()
}
private inner class CaptureClickJavascriptInterface {
@JavascriptInterface
fun onCapturedButtonClicked() {
showClickMessage()
}
}
}