在 Android Studio 中更改 webView 内容

Question

I want to take a pages source code, find specific text and replace it with different text. Then I want to display the altered page to the user. Is there a way to do this in Android Studio?

Answer 1

Something you could do is use a custom WebView and add a new method to load a URL's HTML yourself and modify the returned HMTL. Here's a Kotlin example using coroutines:

class OverrideWebView : WebView {
    constructor(context: Context?) : super(context)
    constructor(context: Context?, attrs: AttributeSet?) : super(context, attrs)
    constructor(context: Context?, attrs: AttributeSet?, defStyleAttr: Int) : super(context, attrs, defStyleAttr)

    private val okHttpClient = OkHttpClient()

    fun loadUrlAndReplace(url: String, replace: (String) -> String) {
        val request = Request.Builder()
            .url(url)
            .build()

        GlobalScope.launch {
            okHttpClient.newCall(request).execute().body()?.string()?.let { html ->


                GlobalScope.launch(Dispatchers.Main) {
                    val newHtml = replace(html)
                    loadData(newHtml, "text/html", "UTF-8");
                }
            } ?: kotlin.run {
                Log.e("ERROR", "Error loading $url")
            }
        }

    }

}

Usage:

 val url = "https://example.com"
 webView.loadUrlAndReplace(url) {html->
       html.replace("Original Text","New Text")
 }

Answer 2

Unfortunately you can not.

You have two options, you can get html source code - parse it and try to adjust design in your android app + add functionality by yourself.

Or display website as Webview, but it will be completely useless, because you can only view content of the page and there is no way to change text etc.

In either way you have to do almost everything by yourself. But having and idea already is a good start anyway, wish you luck!