How to use

1. import the assets to your project
2. init Webview

   binding.webView.settings.apply {
            javaScriptEnabled = true
            javaScriptCanOpenWindowsAutomatically = true
            setSupportZoom(true)
            useWideViewPort = true
            builtInZoomControls = true
        }
        binding.webView.addJavascriptInterface(JsInterface(this@MainActivity), "json_parse")
   

   then load the preview_json.html

   webView.loadUrl("file:///android_asset/preview_json.html")
   

3. Load your json file and convert to string

   webView.loadUrl("javascript:showJson($str)")
   

4. Save your json ``` kotlin inner class JsInterface(context: Context) {

    private val mContext: Context
   
    init {
        mContext = context
    }
   
    @JavascriptInterface
    fun configContentChanged() {
        runOnUiThread {
            contentChanged = true
        }
    }
   
    @JavascriptInterface
    fun toastJson(msg: String?) {
        runOnUiThread { Toast.makeText(mContext, msg, Toast.LENGTH_SHORT).show() }
    }
   
    // save json string
    @JavascriptInterface
    fun saveConfig(jsonString: String?) {
        runOnUiThread {
            contentChanged = false
            Toast.makeText(mContext, "verification succeed", Toast.LENGTH_SHORT).show()
        }
    }
   
    //format failed
    @JavascriptInterface
    fun parseJsonException(e: String?) {
        runOnUiThread {
            e?.takeIf { it.isNotBlank() }?.let { alert(it) }
        }
    }
   

   }

```